Vertex 70vs Manual

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User Manual

1007253

VERTEX 70v


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1stedition 2007, publication date November 2007

2007 BRUKER OPTIK GmbH, Rudolf Plank Str. 27, D-76275 Ettlingen, www.brukeroptics.com

All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any

means including printing, photocopying, microfilm, electronic systems etc. without our prior written per-

mission. Brand names, registered trademarks etc. used in this manual, even if not explicitly marked as

such, are not to be considered unprotected by trademarks law. They are the property of their respective

owner.

The following publication has been worked out with utmost care. However, Bruker Optik GmbH does

not accept any liability for the correctness of the information. Bruker Optik GmbH reserves the right to

make changes to the products described in this manual without notice.

This manual is the original documentation for the VERTEX 70v spectrometer.


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VERTEX 70v User Manual iii

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TABLEOFCONTENTS

1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Warning Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Delivery Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Site Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Connecting VERTEX 70v to the Power Supply . . . . . . . . . . . . . . . . . . . 11Connecting VERTEX 70v to a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Connecting VERTEX 70v to the Vacuum Pump . . . . . . . . . . . . . . . . . . 13Connecting VERTEX 70v to the Purge Gas Line. . . . . . . . . . . . . . . . . . 15

4 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19External Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Internal Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Optical Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Switching VERTEX 70v On and Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31QuickLock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Automatic Accessory Recognition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Performing a Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Evacuating and Venting the Spectrometer. . . . . . . . . . . . . . . . . . . . . . . 36Optimizing the Vacuum Operation of the Spectrometer. . . . . . . . . . . . . 40

Purging the Spectrometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Exchanging the Beamsplitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Exchanging the Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Cooling an MCT Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

6 Maintenance and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Evacuating the MCT Detector Dewar. . . . . . . . . . . . . . . . . . . . . . . . . . . 58Replacing the Laser Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61Replacing a defective IR Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Replacing the Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68


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iv VERTEX 70v User Manual

Ta b l e o f C o n te n ts

Replacing the Sample Compartment Windows . . . . . . . . . . . . . . . . . . . 69Cleaning the Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73Maintaining the Vacuum Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75Diagnostic Means. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76Problem - Possible Cause - Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

A Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

B Consumable Spares . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

C Default Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

D Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

E Connecting VERTEX 70v to PC . . . . . . . . . . . . . . . . . . . . . . 115General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115Possible Connection Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116Selecting Network Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119Assigning Network Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120Checking the Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

F Electronics and Power Supply . . . . . . . . . . . . . . . . . . . . . . . 125Electronics Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125Power Supply Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

G Firmware Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131Updating the Firmware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132Restoring a previous Firmware Version . . . . . . . . . . . . . . . . . . . . . . . . 134Backing up the current Firmware Version . . . . . . . . . . . . . . . . . . . . . . 135

H Sample Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137Sample Preparation Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

I Service Addresses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145


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2 VERTEX 70v User Manual

1 S A F E T Y

Warning Labels

Correct Usage

The spectrometer and its components should only be used according to the instructions

described in the manual or advised by a Bruker engineer. In case of accessories or

components made by other manufacturers and used in connection with the spectrome-

ter, Bruker does not assume any liability for safe operation and proper functioning.

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W A R N I N G L A B E L S

When operating the spectrometer you have to observe a number of safety instructions

which are highlighted by various warning labels. This section describes the warning

labels and explains their meaning. All warning labels on the spectrometer must always

be kept legible. Immediately replace a worn or damaged label.

The following warning labels indicate different dangerous situations which may be

caused by improper use of the spectrometer.

Caut ion - Genera l Hazard

This warning symbol indicates general hazard. Observe the safety

instructions and follow the precautions described to avoid personal injury

and/or property damage.

Caut ion - E lectr ica l Shock

This warning symbol indicates electrical hazard. The symbol is located near

live parts or on enclosures behind which are live parts that represent an

accidental contact hazard. Never touch these parts. Before removing the

corresponding compartment covers and beginning any maintenance or

repair work, first turn off the mains switch and unplug the main power cable.

Ensure that all live parts do not come into contact with a conductive sub-

stance or liquid. Non-observance of these safety instructions can cause

severe personal injury and/or property damage.

Caut ion - Hot Sur face

This warning symbol indicates components and surfaces which can

become very hot during spectrometer operation. Do not touch these com-

ponents and surfaces. Risk of skin burn! Be careful when operating nearhot components and/or surfaces.

Caut ion - Laser Radiat ion

This warning symbol indicates the existence of laser radiation. Never look

directly into the laser beam or use any kind of optical instruments to do so.

Otherwise permanent eye damage can be the result.


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1 S A F E T Y

Safety Instructions

Waste Disposal

Dispose all waste produced (chemicals, infectious and radioactively contaminated sub-

stances etc.) according to the prevailing laboratory regulations. Detergents and clean-

ing agents must be disposed according to the local waste regulations.

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S A F E T Y I N S T R U C T I O N S

The following chapters describe all relevant safety aspects of the spectrometer opera-

tion. Depending on the degree of hazard the safety instructions are classified as fol-

lows:

Danger indicates that death, severe personal injury or substantial property damage

WILL result if proper precautions are not taken.

Warning indicates that death, severe personal injury or substantial property damage

CAN result if proper precautions are not taken.

Caution indicates that minor personal injury or property damage CAN result if proper

precautions are not taken.

Note draws your attention to particularly important information on the product,

e.g. product operation or to a special part of the manual.

The safety instructions Danger, Warningand Caution stand out by the corresponding

warning labels.

Caut ion - Corrosive Substance

This warning symbol indicates the possible presence of corrosive sub-

stances. When working with corrosive substances, always observe the lab-

oratory safety regulations and take protective measures (e.g. wearing

protective masks and gloves). Failure to do so may cause severe personalinjury or even death.


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VERTEX 70v User Manual 5

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VERTEX 70v is an evacuable, fully digital FT-IR spectrometer for demanding R&D

applications. The spectrometer is equipped with a number of features such as AAR

(Automatic Accessory Recognition) ACR (Automatic Component Recognition) and Per-

formanceGuard that facilitate performing spectroscopic measurements and ensure reli-

able measurement results. The function AAR identifies automatically the accessory

installed in the sample compartment, performs several tests and loads automatically the

corresponding experiment file including the pre-defined measurement parameters. The

feature ACR recognizes automatically the currently installed optical components like

source, detector and beamsplitter. These components are electronically coded so that

the spectrometer firmware can recognize them. This information is passed on to the

application software OPUS. The purpose of ACR is to enable the user to select the right

optics parameters in OPUS. In addition, the spectrometer components are monitored

permanently to ensure that they operate within the specification range. This feature is

called Performance Guard. Its purpose is to facilitate fault diagnostics and maintenance.

The data acquisition is based on a free running delta-sigma, dual-channel A/D converter

with 24-bit dynamic range. The A/D converter is integrated into the detector preamplifier

electronics. The DigiTect technology ensures a signal transmission free from interfer-

ences and guarantees the highest signal-to-noise ratio.

VERTEX 70v can be controlled by any data system (PC workstation, notebook etc.) on

which the operating system Microsoft Windows and the spectroscopic software OPUS isinstalled. The Ethernet connection provides the possibility to control the spectrometer

also via your intranet or the internet.

The standard spectrometer configuration is designed for data acquisition in the mid IR

region. Optionally, VERTEX 70v can be equipped with additional optical components to

cover the whole spectral range - starting in the far infrared or THz region at 10cm -1 up to

the ultraviolet region at 28,000cm-1. Due to the pre-aligned optical components and the

permanently aligned RockSolid interferometer, the spectral range can be changed eas-

ily. If you work with the advanced spectrometer configuration (i.e. two detector positions

and two source positions are available inside the spectrometer) you can select them

using the software. Removable vacuum-tight covers provide access to the detector and

beamsplitter if you want to exchange these components.

VERTEX 70v has five IR-beam outlet ports (on the right, front and left side) and two IR-

beam inlet ports (on the right and rear side) allowing the connection of a multitude of

optional accessories and/or components like:

TGA-coupling

PMA 50 (Polarization Modulation Accessory for VCD and PM-IRRAS)

HYPERION 1000/2000 IR microscope and HYPERION 3000 imagingmicroscope with FPA detector (Focal Plane Array detector system)

IMAC module (Imaging Accessory with FPA detector)


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G E N E R A L I N F O R M A T I O N

Unpacking and initial installation of VERTEX 70v is done by Bruker service engineers.

The operating company has to provide an installation site that meets the site require-

ments described in this chapter. (See also the technical document Installation Require-

ments for VERTEX 70vprovided by Bruker Optik GmbH in advance.)

This chapter contains a list of the standard as well as the optional spectrometer compo-

nents and describes the procedures for connecting the spectrometer:

to the power supply, to a PC,

to the vacuum pump and

to the purge gas supply line, if necessary.

For detailed information about how to install the computer, refer to the PC manual.

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D E L I V E R Y S C O P E

The basic instrument of VERTEX 70v allows upgrading with additional components and/or accessories. The delivery scope depends on the spectrometer configuration you

have ordered.

Standard Components

The basic instrument includes the following items:

VERTEX 70v spectrometer (including the user manual)

Power cord

PC compatible data system (if desired, the PC can also be provided by the

customer) Data cable (Cat5, crossover cable for 10Base-T Ethernet standard)

Purge gas hose (OD: 6mm, length: approx. 5m)

Tool kit (slot-head screw driver, cross-head screwdriver and hex keys of severalsizes, sample preparation tools, 3x spare fuses, IR sensor card, metallic cap

shown in fig. 28)

Software package OPUS/IR (including the OPUS Reference Manual)


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3 I N S T A L L A T I O N

Delivery Scope

For installing the vacuum pump, the following items are included:

Vacuum pump (including the user manual)

Noise reduction hood

Vibration absorber

2x flexible metal hoses 4x hose clamps

4x sealing rings

Opt ional Components

Depending on the ordered spectrometer configuration, the delivery scope can also

include following optional components:

Optional spectrometer components (e.g. optional detectors) and/or accessories

Optional OPUS software packages (e.g OPUS/STEP) including the corresponding

manuals

Inspect ing the Packaging

After the receipt of the spectrometer, inspect the packaging for damages. If there are

any signs of damage, contact your local shipping representative before opening the

shipping box.

Warning: Do not put a spectrometer into operation that shows signs of

damage. Failure to do so may result in severe personal injuries

and/or property damage.

Transpor tat ion

Due to its weight (about 105kg), VERTEX 70v has to be carried by at least four persons

using the supplied transport handles. For transportation purposes, attach these handles

properly to the right and left spectrometer side as shown in figure 1 using 12 screws

(M5 x 16). Tighten the screws using a hex kex (size 4mm). After having transported the

instrument to the desired place, you can remove the transport handles again. Alterna-

tively, you can transport the instrument with a fork lifter.

Warning: Due to the high instrument weight, improper transportation can

lead to personal injuries and/or spectrometer damage.


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I N S T A L L A T I O N

Site Requirements

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S I T E R E Q U I R E M E N T S

Space Requirements

The spectrometer dimensions are 85cm (w) x 71cm (d) x 32cm (h). (For exact spec-

trometer dimensions refer to appendix D.) At the rear side, the spectrometer requires a

clearance of at least 25cm (10). The spectrometer should be placed on a stable and

horizontal base. Note that the basic instrument has a weight of about 105kg.

When preparing the installation location for the spectrometer, take into consideration

that the mains power supply connection is easily accessible at any time. The mains

power supply can be interrupted, for example, either by disconnecting the safety plug or

switching off the mains switch on the spectrometer rear side or disconnecting the pri-

mary power receptacle.

Environmenta l Requi rements

To ensure optimum spectrometer performance and long-term reliability the following

environmental conditions are essential:

Temperature Range: 18 - 35 C (64 - 95 F)

In case the vacuum pump is operated with installed noise reduction hood ensure the

ambient temperature does not exceed 32C (90F).

Humidity (non-condensing): 80% (relative humidity)

Temperature variations can impair the results of long-term measurements. Therefore,

the temperature variations should be less than 1C per hour and should not exceed 2C

per day for this type of measurement.

Figure 1: Installing the Transport Handles

Transport

Handles


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Site Requirements

Vibrat ion

Ideally, the spectrometer should not be installed near vibration sources (e.g. ventilation

hoods, air conditioners, motors, elevator etc.) or in rooms with intense floor vibration.

Power Supply

The spectrometer power supply unit automatically adapts to the most common power

sources.

Valid voltage range: 100 V AC to 240 V AC

Valid frequency range: 50 to 60 Hz

VERTEX 70v is an instrument of the protection class I.

Caution: To avoid personal injury and spectrometer damage, connect the

spectrometer only to a socket outlet with earthing contact.

To provide for good data quality and a long spectrometer service life, ensure that the fol-

lowing site requirements are met:

Do not install the spectrometer near sources of potential inductive electricalinterference (e.g. pumps, switching motors, microwave ovens etc.), sources of

high energy pulses, and sources that might cause magnetic or radio frequency

interference.

Do not place devices such as large electric motors, heaters, welding equipment,radio transmitting equipment, units emitting pulsed NMRs, or high powered lasers

in close vicinity to the spectrometer. These devices can interfere with thespectrometer and cause spectrometer malfunction. Ensure that these types of

devices are not connected to the same electrical circuit as the spectrometer.

If a reliable mains power supply is a problem at your site (caused by brownouts,power surges, frequent thunderstorms, for example), take precautions to ensure

an uninterruptible power supply.


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Connecting VERTEX 70v to the Power Supply

C O NN E CT I NG V E RT E X 7 0 V TO T H E PO W ER

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S U P P L Y

Power CordBefore connecting the power cord, make sure that the spectrometer is switched off, i.e.

the mains switch (B in figure 2) is in the O position. Connect the supplied power cord

to the primary power receptacle (C in figure 2) as well as to the mains socket outlet.

The power cord length should not exceed 3m. Depending on the local conditions, the

original power cord may need to be exchanged for a power cord that complies with the

standards of the country in question. The power cord must have approbation of at least

your local authority, UL for US, CSA for Canada or VDE for Europe. The spectrometer

power supply unit automatically adapts to the local voltage and frequency range. (See

section Site Requirements.)

Component

A Ethernet port

B Mains switch

CPrimary power receptacle (for connecting the

power cord)

Figure 2: Spectrometer Rear Side - Connections for Power Supply and PC

A

B

C


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Connecting VERTEX 70v to a PC

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C O NN E CT I NG VE R TE X 7 0 V T O A PC

Data Cable

The data cable included in the spectrometer delivery scope is a CAT5 crossover cable(labelled Cross-over) with two RJ-45 plugs. This cable is only used for the direct con-

nection of VERTEX 70v to a computer. If you intend to connect the spectrometer to a

network, a different type of cable (i.e. non-crossover, CAT 5 cable for the 10Base-T Eth-

ernet standard) is required. (See appendix E.) The data cable length should not exceed

100m (without repeater).

Connect one end of the data cable to the Ethernet port (ETH) (A figure 2) and the other

end of the data cable to the RJ-45 socket of the computer network interface card. (For

detailed information refer to the computer manual.)

After having set up the data cable connection, turn on the spectrometer using the mainsswitch. After a few seconds, the spectrometer beeps once and starts a self test. After

the initialization has been completed successfully, the STATUS LED (figure 10) turns

from red to green. Now switch on the computer and the monitor. (For information on

how to install the computer and how to set up signal and power cable connections for

the computer, monitor etc. refer to the computer manual.)

Computer Setup

VERTEX 70v and the delivered PCare already configured for the stand-alone opera-

tion. The spectrometer IP address is factory-set to 10.10.0.1. In case you have not pur-

chased the computer together with the VERTEX 70v spectrometer, you have to assign

an appropriate IP address to the computer to which you want to connect the spectrome-

ter. For detailed information about how to assign an IP-address to the computer refer to

appendix E.


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Connecting VERTEX 70v to the Vacuum Pump

C O NN E CT I NG V ER T EX 7 0 V TO T H E VA C UU M

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P U M P

The attachment flange (NW25 flange) for connecting the vacuum pump is at the spec-

trometer rear side. Figure 3shows the valve block with removed cover.

The vent openings are covered by a plug made from sintered-powder metal which is air-

permeable (i.e. the spectrometer can be vented with the plugs installed on the vent

opening). (See figure 8.) The plug functions like a filter preventing particles from enter-ing the spectrometer together with the influent air.

Note: For detailed information about the vacuum pump refer to the user

manual provided by the vacuum pump manufacturer.

Attachment Flange for the Vacuum Pump

Opening for venting

the optical bench(Note:When purging the

spectrometer this port is

used as purge gas inlet for

the optical bench.

Valve for evacuatingthe optical bench

Valve for evacuating

the sample compart-

ment

Figure 3: Valve Block (Spectrometer rear Side)

Opening for venting

the sample compart-

ment(Note:When purging the

spectrometer this port is

used as purge gas inlet for

the sample compartment.

Valve for venting the

sample compartment

Valve for venting the

optical bench


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Connecting VERTEX 70v to the Vacuum Pump

Insta l la t ion Procedure

Remove the valve block cover shown in figure 4by loosening the two Allen screwsusing a hex key (size 3mm) and pulling off the cover.

Install the supplied sealing ring at the attachment flange. See figure 5.

Press the supplied flexible metal hose against the attachment flange (figure 6a)and attach the hose to the flange using the supplied hose clamp (figure 6b).

Secure the hose clamp by fastening the wing screw.

Allen Screws Valve Block Cover

Figure 4: Removing the Valve Block Cover

Figure 5: Connecting VERTEX 70v to Vacuum Pump - Step 1

Attachment Flange Sealing Ring

FlexibleMetal Hose


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Connecting VERTEX 70v to the Purge Gas Line

During operation, the vacuum pump generates vibrations. In order to prevent these

vibrations from being transferred to the spectrometer via the flexible metal hose, the

supplied vibration absorber has to be installed between the vacuum pump and the

spectrometer. The procedure for connecting the flexible metal hose to the vacuum

pump and to the vibration absorber is identical to the procedure described above.

Note: Make sure that the vibrating metal hoses do not come into contact

with the table on which the spectrometer is placed.

During the operation, the vacuum pump produces an increased noise level. In order toreduce the noise level install the supplied noise reduction hood over the vacuum pump.

For information about the noise reduction hood installation refer to instructions provided

by the pump manufacturer.

C O NN E CT I NG V E RT E X 7 0 V TO T H E PU R GE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

G A S L I N E

As an alternative to the vacuum operation, VERTEX 70v can be purged with either dry

air or dry nitrogen gas. The spectrometer has two purge gas inlets; one for purging thesample compartment and the other for purging the optical bench. The purge gas inlets

are at the spectrometer rear side. See figure 7.

Figure 6: Connecting VERTEX 70v to Vacuum Pump -Step 2

Hose ClampWing Screw


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For detailed information about the required purge gas supply conditions refer to chapter

Operation, section Purging the Spectrometer.

Insta l la t ion Procedure

Note: In case the spectrometer is evacuated, first vent it before starting

the installation procedure. Otherwise, a warning message regarding

unstable pressure conditions inside the spectrometer will appear.

To connect the spectrometer to the purge gas supply you need a stiff hose with anouter diameter of 6mm. Remove the plug (made from sintered-powder metal) from

the purge gas inlet by pressing the lock ring inwards (figure 8) and pulling out the

plug. Connect one end of the hose to your supply line for dry air or dry nitrogen

gas and insert the other end of the hose into the purge gas inlet for either the

sample compartment or optical bench.

If you want to purge both the sample compartment and the optical bench, youneed aT-shape connecting hose with two hose ends leading to the spectrometer.

After having connected the main end of the hose to the supply line, insertone of

the other two hose ends into the purge gas inlet for the sample compartment and

the other hose end into the purge gas inlet for the optical bench.

Figure 7: Purge Gas Inlets

Purge gas inlet for

optical bench.(Note:In case of vacuum

operation - vent opening for

venting the optical bench.)

Purge gas inlet for

sample compartment.(Note:In case of vacuum

operation - vent opening for

venting the sample com-

partment.)


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Figure 8: Purge Gas Inlet with removed Plug

Plug

Lock Ring


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O V E R V I E W 4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


This chapter describes all relevant external and internal spectrometer components.

Note: The local indications r ightand leftassume that the operator stands in

front of the spectrometer. The indications forwardand backwardrefer

to the spectrometer front side and rear side, respectively.

Compartment

A Power Supply Connector

B Status Indicator Board

C Electronics Compartment

D Interferometer Compartment

E Detector Compartment

F Sample Compartment

G Laser

H Vacuum Pump Connection Port

I Beam Direction Control Compartment

A

B

C

D

E

F

GH

I

Figure 9: General Overview


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4 O V E R V I E W

External Components

The detector compartment, the interferometer compartment and the beam direction

control compartment are not separated from each other but form one compartment. All

spectrometer compartments are accessible by removing the corresponding cover.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

E X T E R N A L C O M P O N E N T S

Status Indicator Board

The status indicator board is in the left rear corner of the spectrometer, more precisely,

on the electronic compartment cover. (See figure 10.) The color of the LEDs gives a

general indication of the operating status of the corresponding spectrometer compo-

nent. Moreover, the color of the Vacuum LED indicates the current pressure situation

inside the spectrometer compartments (i.e it shows whether a certain compartment is

being evacuated/vented just now or is already evacuated/vented). In case one of these

LEDs lights up red indicating a spectrometer problem refer to chapter Troubleshooting.This chapter shows possible causes of a problem and provides solutions.

V A C U U M

The color of VACUUM LED depends on the current pressure situation inside the individ-

ual spectrometer compartments. The following table explains the meaning of the differ-

ent LED colors:

LED is off. Sample compartment and optical bench are vented.

LED flashes green. Sample compartment and optical bench are being either evacuated or vented.

LED lights up green. Sample compartment and optical bench are evacuated. The ultimate vacuum isachieved.

LED flashes yellow. Sample compartment is being either evacuated or vented. (In case the sample

compartment is already vented, it flashes yellow also when the optical bench is

being vented.)

LED lights up yellow. Sample compartment is vented.

LED lights up red. When the spectrometer is being evacuated, but a certain threshold pressure value

is not reached within a certain period of time (i.e. the ultimate vacuum is not

achieved). A red VACUUM LED indicates a problem. See chapter Troubleshooting,

section Problem - Possible Cause - Solution, subsection Spectrometer problem

indicated by spectrometer status indicator.

Figure 10: Status Indicator Board


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O V E R V I E W

External Components

LA S E R

The LASERLED lights green when the laser is in operation and the laser signal is OK.

The LASERLED lights up red if the laser power is too weak, the laser beam is blocked

or if the laser module is defective or out of alignment. (See chapter Troubleshooting,

section Problem - Possible Cause - Solution, subsection Spectrometer problem indi-

cated by spectrometer status indicator.) This control lamp also lights up red during the

spectrometer initialization phase. After the initialization is completed successfully, this

LED turns to green.

S TA TU S

A green STATUSLED indicates that the spectrometer is in proper operating condition.

The STATUSLED lights up red in case of a spectrometer malfunction or during the ini-

tialization phase. After the initialization is completed successfully, this LED turns to

green. (See chapter Troubleshooting, section Problem - Possible Cause - Solution, sub-

section Spectrometer problem indicated by spectrometer status indicator.)

Sample Compartment

Normally, you gain access to the sample compartment from the spectrometer top side

by removing the blue cover using the handle. See figure 11a. In exceptional cases, if

your measurement accessory requires access from the spectrometer front side (e.g. for

exchanging the sample), you can remove the blue front cover by loosening the six Allen

screws using a hex key size 3mm. See figure 11b.

Note: When performing measurements under vacuum condition do not

forget to reinstall the sample compartment front cover.

The sample compartment dimensions are 25.5cm (w) x 27cm (d) x 16cm (h). For more

information about the sample compartment interior refer to chapter Operation, section

QuickLock.

Figure 11: a) Sample Compartment Top Cover b) Sample Compartment Front Cover

Allen ScrewsSample Compartment Cover Handle


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4 O V E R V I E W

External Components

IR Beam Por ts

VERTEX 70v has seven IR beam ports (five outlet ports and two inlet ports) allowing

the adaptation of external accessories and/or components (e.g. microscope, TG-IR cou-

pling or external light source). The IR beam ports are at the front and rear side as well

as at the left and right hand side of the spectrometer. For the exact dimensions of the IRbeam port positions refer to appendix D.

IR Beam Ports

A Outlet port for focussed beam (e.g. for connecting a bolometer)

BOutlet port for parallel beam (e.g. for connecting a fiber optic coupling

module)C Inlet port for connecting a light emission source (e.g. Hg source)

D Outlet port for parallel beam

EOutlet port for parallel beam (e.g. for connecting a microscope, PMA50,

external sample compartment XSA)

FInlet port for connecting a light emission source (e.g. FT-Raman mod-

ule, water-cooled, high-power MIR source)

GOutlet port for parallel beam (e.g. for connecting a microscope) or

focussed beam (e.g. for connecting a bolometer)

Figure 12: c) Right Side d) Left Side

Figure 12: a) Front Side b) Rear Side

A B

D E F G

C


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O V E R V I E W

External Components

The IR beam ports are vacuum-tight sealed by circular covers. To remove a cover

loosen the six Allen screws using a hex key size 3mm. See figure 13.

Note: External accessories are installed by the Bruker service technicians.

Spectrometer Rear S ide

Allen Screws

Figure 13: Removing an IR Beam Port Cover

Figure 14: Spectrometer Rear View

External Beam

Port

Vent Opening/

Purge Gas Inlet

Electronics

Panel

Mains Switch

CAN BUS

Port

Primary Power

Receptacle

Attachment Flange

for Vacuum Pump


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4 O V E R V I E W

External Components

E X TE R N A L B E A M P OR T

The inlet port is used for connecting a light source (e.g. Hg-Source) or an emission

sample.

V E N T OP E N IN G / P U R GE GA S IN LE T

Depending on whether you evacuate or purge the spectrometer, these two ports serve

different purposes. In case of evacuating the spectrometer these ports serve as vent

openings, whereas, when purging the spectrometer the purge gas supply lines are con-

nected to these ports. (For detailed information about installing the purge gas connec-

tion refer to chapter Installation.)

E LE C TR ON IC S P A N E L

On the electronics panel are a number of ports (e.g. Ethernet port), the reset button as

well as LEDs indicating, for example, the status of the interferometer. For a detailed

description of the electronics panel refer to appendix F.

M A IN S S WITC H A N D P R IM A R Y P OWE R R E C E P TA C LE

The mains switch is used to turn the spectrometer on and off. The power supply socket

is used to connect the power cord to the spectrometer.

C A N B U S P OR T

The CAN bus port is primarily used to connect external automated units to the spec-

trometer. For more information refer to appendix F.

A TTA C H M E N T FLA N GE FOR V A C U U M P U M P

The vacuum pump can be connected to this attachment flange (NW25) using the sup-

plied sealing ring, flexible metal hose and hose clamp. (For detailed information about

how to connect the vacuum pump to the spectrometer refer to chapter Installation.)


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Internal Components

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I N T E R N A L C O M P O N E N T S

The following figure identifies only the most important internal components and their

location inside the spectrometer.

Component

A RockSolid interferometer (permanently aligned)

B DigiTect Detectors

C Sample holder for transmission measurements (exchangeablefor other optional accessories with QuickLock baseplate)

D HeNe laser

E Two beamsplitters storage positions (optional)

F Beamsplitter (operation position)

G Optional NIR source (operating position)

H MIR source (operating position)

I QuickLock mechanism for accessories (including connectors)

Figure 15: Internal Spectrometer Components

B

D

E

A

F

G

H

IC


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4 O V E R V I E W

Internal Components

Light Source

The basic instrument is equipped with a MIR source (H in figure 15). The MIR light

source is a globar (i.e. an U-shaped silicon carbide piece) that emits mid-infrared light.

Apart from the standard air-cooled MIR source, the following optional sources are avail-

able:

VIS/NIR source (tungsten halogen lamp), installed in the spectrometer (G infigure 15), air-cooled

FIR source (mercury lamp), connected externally to the spectrometer, water-cooled

UV/VIS/NIR source (tungsten lamp), connected externally to the spectrometer,water-cooled

UV source (deuterium lamp), connected externally to the spectrometer, air-cooled

High power MIR source (globar), connected externally to the spectrometer, water-cooled

All external sources can be connected to one of the two inlet ports (C in figure 12b or F

in figure 12c). For the FIR source (mercury lamp), the preferred connection port is the

inlet port at the spectrometer rear side, C in figure 12b.

Detector

The basic spectrometer configuration is equipped with a DigiTect DLaTGS detector with

integrated preamplifier. This detector package contains an analog-to-digital-converter

that converts the analog signal from the detector directly into a digital signal. This digitalsignal is transmitted to the data processing electronics unit of the spectrometer. The

standard detector is a pyroelectric DLaTGS detector which covers a spectral range from

12,000 to 250cm-1, operates at room temperature and has a sensitivity of D*>4x108cm

Hz1/2W-1.

Apart from the standard detector, there is a large number of optional detectors. All

detectors are mounted on dovetail slides which allow an easy exchange. The following

optional detectors are available:

DetectorSpectral

Range (cm-1)Sensitivity

Operating

Temperature

Mid-Infrared

DLaTGS with KBrwindow

12,000 - 250 D*>4x108cm Hz1/2W-1 Temperature-sta-bilized

DLaTGS with CsI

window

12,000 - 160 D*>4x108cm Hz1/2W-1 Room temperature

MCT narrow band,

with BaF2window

CAUTION - HARMFUL!

12,000 - 850 D*:>4x1010cm Hz1/2 W-1 Liquid N2cooled


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O V E R V I E W

Internal Components

Warning: Some detectors are equipped with windows of which the material

is harmful or (very) toxic. During normal spectrometer operation,

these materials do not pose a health risk. However, should these

windows break caused by mechanical impact, be extremely

careful. Avoid generating dust. These materials are harmful or

toxic if swallowed or inhaled. Also avoid skin and eye contact.

MCT mid band, withZnSe window

CAUTION - TOXIC!


MCT broad band,with KRS-5 windowCAUTION - TOXIC!

12,000 - 420 D*:>5x109cm Hz1/2W-1 Liquid N2cooled

Photovoltaic MCT,

with BaF2 window

CAUTION - HARMFUL!


MCT/InSb Sandwich,

with ZnSe windowCAUTION - TOXIC!

10,000 - 600 D*:>2x1010cm Hz1/2W-1 (MCT)

D*:>1.5x1011cm Hz1/2W-1(InSb)

Liquid N2cooled

Near-Infrared

InSb 10,000 - 1,850 D*:>1.5x1011cm Hz1/2 W-1 Liquid N2cooled

InSb with cold filter 10,000 - 3,100 D*>5x1011cm Hz1/2 W-1 Liquid N2cooled

Ge Detector (Raman) 11,750 - 5,900 NEP


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4 O V E R V I E W

Internal Components

Beamspl i t ter

The standard KBr beamsplitter covers a spectral range from 8000 to 350cm-1. Apart

from the standard beamsplitter, there are also optional beamsplitters. They allow data

acquisition in wavelength ranges other than MIR (standard) when used in conjunction

with the appropriate light source and detector. Note that the combination of light source,

detector, beamsplitter and sample compartment window material defines the IR mea-

surement range. The following optional beamsplitters are available:

Caution: The beamsplitter material CaF2is harmful if inhaled or swallowed.

Avoid also skin and eye contact.

Laser VERTEX 70v is equipped with a HeNe laser (D in fig. 15) It emits red light with a wave-

length of 633nm. The rated power output is 1mW. The laser controls the position of the

moving interferometer mirror (also called scanner) and is used to determine the data

sampling positions. The monochromatic beam produced by the HeNe laser is modu-

lated by the interferometer to generate a sinusoidal signal. For information about how to

replace a defective laser module, refer to chapter Maintenance and Repair.

In ter ferometer VERTEX 70v is equipped with a high stability interferometer with ROCKSOLID perma-

nent alignment. The ROCKSOLID interferometer incorporates dual retroreflecting cube

corner mirrors in pendulum arrangement. The high throughput design ensures the high-

est possible signal-to-noise ratio.

Beamsplitter Spectral Range (cm-1)Color Coding of theBeamsplitter Handle

Mid-Infrared

KBr (standard) 7,500 - 370 red

KBr (broad band) 10,000 - 400 red

Csl 5,000 - 210 red

Near-InfraredCaF2CAUTION - HARMFUL!

15,500 - 1,200 black

Visible & UV

Quartz VIS/UV 25,000 - 9,000 white

Far-Infrared

Multilayer (far IR) 680 - 30 nickel-plated

Mylar 25m 120 - 20 nickel-plated

Mylar 50m 50 - 10 nickel-plated

Solid state 600 - 30 ** limited to a spectral resolution of 0.5cm-1

nickel-plated

Al ignm ent Tool

Glass For alignment purposes only! nickel-plated


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O V E R V I E W

Optical Path

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O P T I C A L P A T H

The beam path shown in figure 16ist the beam path of the standard spectrometer con-

figuration.

D1 Standard detector D2 Optional detector

BMS Beamsplitter

APT Aperture wheel

OPF Optical filter wheel

IN1 ... IN2 Beam inlet port 1 ... 2

OUT1 ... OUT5 Beam outlet port 1 ... 5

Figure 16: VERTEX 70v - Optical Path


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4 O V E R V I E W

Optical Path


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OPERATION 5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


After the spectrometer has been installed and connected to the power supply, the PC,

and the vacuum pump, the spectrometer is ready for operation. VERTEX 70v is com-

pletely computer-controlled, i.e. operating the spectrometer (e.g. selecting the corre-

sponding optical components) performing a measurement and evacuating/venting the

spectrometer is done using the spectroscopic software OPUS.

This chapter describes mainly the spectrometer related aspects of the operation. For

detailed information about the OPUS software refer to the OPUS Reference Manual.

The OPUS manual Getting Started explains step by step how to perform the first mea-

surement after the spectrometer has been set up.

The standard spectrometer configuration is designed for measurements in the mid infra-

red region. Optionally, the spectral region can be expanded by substituting the installed

MIR components (source, detector, beamsplitter and sample compartment windows, if

available) for the corresponding optical components that allow measurements in the far

or near infrared as well as in the visible or ultraviolet region. (For information about the

replacement procedure of these optional components refer to the corresponding sec-

tions in this chapter and in chapter Maintenance and Repair.)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S W IT C HI N G V E RT E X 7 0 V O N AN D OF F

Genera l Informat ion

The spectrometer is turned on and off using the mains switch at the spectrometer rear

side (figure 14). After having switched on the spectrometer, it starts booting. The boot

process takes about 30 seconds. As soon as this process is completed successfully, the

STATUS LED (figure 10) turns from red to green.After having switched on the spectrometer wait at least ten minutes before starting the

first measurement. This allows for the electronics and the light source to stabilize ther-

mally.

Caution: After having switched the spectrometer off, wait at least 30 sec-

onds before switching the spectrometer on again. This measure

avoids peaks in the initial current which could lead to fuse blowing

and/or damaging the power switch.


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5 O P E R A T I O N

Switching VERTEX 70v On and Off

Switch-on Procedure

To put the spectrometer into operation again, proceed as follows:

1 Switch on the PC.

2 Switch on the spectrometer. The spectrometer begins to start up.

Note: After the spectrometer initialization is completed successfully, the

STATUS LED turns to green. Now the spectrometer is ready for

operation again.

3 Connect the the vacuum pump to the power supply.

Note: For information about how to operate the vacuum pump refer to the

supplied user manual of the vacuum pump manufacturer.

Switch-of f Procedure

Ideally, the spectrometer should uninterruptedly be kept under vacuum, even during

times of nonuse. If, however, the circumstances require a switching-off of the vacuum

pump and/ or the spectrometer the following procedure is recommended:

1 Evacuate the optical bench.

2 As soon as the final pressure is reached, switch off the spectrometer.

Note: The evacuation will take about 5 minutes. In the electroless

spectrometer state, all valves (for venting as well as for evacuatingthe spectrometer) are closed.

3 Disconnect the vacuum pump from the power supply.

In this state, the spectrometer interior is isolated from the laboratory environment and

the optical spectrometer components are protected against air humidity and they are no

longer current-carrying.


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O P E R A T I O N

QuickLock

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Q U I C K L O C K

The sample compartment is equipped with a locking mechanism, called QuickLock, for

positioning and locking different measurement accessories. Therefore, you can use

only accessories that are mounted on a QuickLock baseplate. The QuickLock mecha-

nism enables a solid lock even for heavy and bulky accessories and allows a quick,

easy and reproducible positioning of the measurement accessories in the sample com-

partment.

When you insert and lock the accessory, all connections (purge gas connection and

electrical connection)are established and the accessory is automatically recognized by

the application software OPUS. This software feature is called AAR - Automatic Acces-

sory Recognition. In addition, the recommended measurement parameters are selected

automatically, provided that you have already stored the parameters for the accessory

in question. (See OPUS Reference Manual.)

The QuickLock mechanism also allows purging the sample compartment with dry air or

nitrogen gas. The purge gas enters the sample compartment via the gas diffusor(figure 18).

Purge gas

connection port

QuickLock

locking deviceElectronic

connectors

Figure 17: a) Sample Compartment - QuickLock Holder b) QuickLock Release Button


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5 O P E R A T I O N

QuickLock

To inser t an accessory wi th QuickLock baseplate:

1 Hold the accessory with the QuickLockbaseplate front edge slightly tilted

upwards. Then, gently push the electrical connectors of the baseplate

against their counterpart of the QuickLock holder. Put the baseplate down.

Ensure that the baseplate is horizontally aligned to the QuickLock holder.

2 Gently press the front edge of the baseplate downward until it snaps into

place. To facilitate the insertion of the accessory, press the release button

outside the sample compartment. (See figure 17b.)

To remove an accessory wi th QuickLock baseplate:

1 Press the QuickLock release button outside the sample compartment. (See

figure 17b.)

2 While pressing the QuickLock release button, lift the front edge of the

QuickLock baseplate until the baseplate snaps free.

3 Carefully lift the accessory off the QuickLock holder to avoid damages to the

electrical connectors at the baseplate rear side.

Figure 18: Accessory with QuickLock Baseplate

Purge gas

diffusorElectronic connectors

for AAR and CAN bus


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O P E R A T I O N

Automatic Accessory Recognition

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A U T O M A T I C A C C E S S O R Y R E C O G N I T I O N

As soon as an accessory is locked into the QuickLock holder, the OPUS/AAR software

(Automatic Accessory Recognition) starts and recognizes automatically the accessory

in question, provided you have activated the AAR function in the OPUS software. (For

information about how to activate the AAR function refer to the OPUS reference man-

ual, OPUS manual partAutomatic Accessory Recognition).

The OPUS/AAR software identifies the accessory, performs several tests, adapts the

measurement parameters and opens the Measurementdialog window to start a mea-

surement. If the automatic accessory recognition has been completed successfully,

OPUS displays a corresponding message.

Each time you start OPUS, the AAR program checks whether an accessory is installed

into the sample compartment. If AAR detects an accessory, the corresponding dialog

box is displayed. It also appears when the accessory is substituted by another one.

Note: When installing a new accessory for the first time, it is not yetregistered so that the OPUS/AAR software can not recognize it. In

this case, you first have to register the new accessory in question.

(See OPUS Reference Manual.)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P E R F O R M I N G A M E A S U R E M E N T

The measurement procedure described in the following refers exclusively to measure-

ments under vacuum conditions. In case you want to perform a measurement not under

vacuum ignore the steps regarding evacuating and venting the spectrometer.

Specify the measurement parameters in the OPUS programme. To do this, selectin the OPUS Measuremenu theAdvanced Measurementfunction and select or

enter the corresponding parameter values. (The standard parameter values are

listed in appendix C.)

Evacuate the spectrometer as described in the following section. (Wait until theultimate vacuum is achieved.)

Acquire a background spectrum without the sample in the sample compartment byclicking in OPUS on the Background Single Channelbutton. (See figure 19.)

Vent the sample compartment as described in the following section.

Put the sample in the sample compartment. (For information about how to install aQuickLock accessory into the sample compartment refer to the section QuickLock

in this chapter. For information about sample preparation refer to appendix G.)

Evacuate the sample compartment again. (Wait until the ultimate vacuum isachieved.)

Acquire a sample spectrum by clicking in OPUS on the Sample Single Channelbutton (figure 19) and calculate the ratio (transmittance spectrum).

Note: Use the same parameter values for the background and the sample

measurement. Ensure that both measurements are performed under

identical ambient conditions.


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5 O P E R A T I O N

Evacuating and Venting the Spectrometer

For detailed information about OPUS functions for data acquisition, manipulation and

evaluation refer to the OPUS Reference Manual.

E V A C U A T I N G A N D V E N T I N G T H E

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S P E C T R O M E T E R

VERTEX 70v is primarily designed for vacuum operation, but it can be purged as well.To activate the vacuum mode, select in the OPUS Measuremenu the Optic Setup and

Servicefunction. Click on the Devices/Optionstab and make sure that the Purge Mode

check box is not ticked off. See figure 20.

Figure 19: OPUS Measurement Dialog Window

Figure 20: Activating the Vacuum Mode

With this checkboxbeing deactivated,

the vacuum mode is

activated.


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O P E R A T I O N


The flaps and the venting and evacuating valves are controlled automatically via the

OPUS software. So evacuating and venting the sample compartment and/or optical

bench is done using the OPUS software. The corresponding buttons are at the Basic

page of the Measurementdialog window. See figure 21.

Let us assume the following initial situation: both the sample compartment and the opti-

cal bench are vented. In this case, it is not possible to evacuate only the sample com-

partment. (The evacuation of only the sample compartment is not possible as in this

case the pressure difference between the sample compartment and the optical bench

would damage the flaps, i.e. the flaps are not designed for such an operation condition.)

So, clicking on either button effects the evacuation of both compartments. The evacua-

tion process is indicated by the message Sample / Optics Evacuatingthat appears in

the fields below the buttons. The progress of the evacuation is shown by the perma-

nently updated pressure readings in the lower fields. See figure 22.

Note: After you have clicked on a button, the labeling of this button

changes immediately showing the action that can be performed next

(i.e. Evacuate...turns to Vent...and versa vice).

Current state in the

individual compart-ments including the

current pressurereading

Command that can be

executed next byclicking on this button.

Figure 21: Optical bench and sample compartment are vented.


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5 O P E R A T I O N


As soon as the evacuation process is completed, the message Sample / Optics Evacu-

atedappears in the lower fields. See figure 23.

Note: If the sample compartment is evacuated you can not open it.

Note: To prevent OPUS from starting a measurement while the

spectrometer is being evacuated or vented proceed as follows: Click

in the Measurementdialog window on the Opt ictab and select in the

Opt ical bench readydrop-down list the option Pressur e stable. See

figure 24.

Figure 22: Optical bench and sample compartment are being evacuated.

Figure 23: Both compartments are evacuated.


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O P E R A T I O N


When both compartments are evacuated you can vent the sample compartment sepa-

rately (for example, if you want to open the sample compartment in order to exchange

the sample) by clicking on the Vent Samplebutton.

Note: When both compartments are evacuated, venting only the optical

bench is not possible as the pressure ratio inside the spectrometer

would damage the flaps. For safety reasons, the instrument does not

perform this operation. In this case, clicking on the Vent Op tics

button effects the ventilation of the sample compartment as well. This

precaution prevents the instrument from being operated wrongly.

Figure 24: Defining the Measurement Start Precondition

Figure 25: Sample compartment is vented and optical bench is evacuated.


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5 O P E R A T I O N

Optimizing the Vacuum Operation of the Spectrometer

O P T I M I Z I N G T H E V A C U U M O P E R A T I O N O F

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T H E S P E C T R O M E T E R

Genera l Informat ionTo get optimum measurement results under vacuum conditions, there are some aspects

that need to be taken into consideration:

The thermal conditions in an evacuated optics bench and in a purged optics bench

are completely different, i.e., under vacuum there is no thermal conduction at all

due to the lack of the purge gas. This aspect has consequences on the

reproducibility of the measurement results.

Water molecules are very polar. Due to this property, they tend to stick at the inner

wall of the optics compartment. For this reason, it takes time to get the water

vapor pumped off completely.

The purpose of the following advice is to help you in achieving optimum measurement

results.

Reproducibi l i ty of the Resul ts

After having evacuated the spectrometer, it is highly recommended that you allow the

spectrometer to stabilize long enough.An optimally stabilized spectrometer is able to

achieve an extreme high 100%-line stability in the sub-%-level with the standard optical

components designed for MIR measurements. (Note: A precondition is that the roomtemperature does not vary by more than 1C per hour and 2C per day. Typically, this

condition can be fulfilled in an air-conditioned environment.)

R e c o mme n d a t io n s :

For demanding experiments, a stabilization period of at least 4 hours is

recommended. After this period, the maximum instrument stability is achieved.

For non demanding experiments, a stabilization time of 0.5 hour is sufficient.

During a long-term experiment, it is recommended to repeat the background

measurement in regular interval, at least every hour. Ideally, the spectrometer should be kept under vacuum overnight.


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O P E R A T I O N


Residual Water Vapor

Longer evacuation times will further reduce the residual water vapor concentration

inside the spectrometer:

Note: Besides the necessity of a water vapor concentration being as low aspossible, there is another aspect regarding water vapor you have to

take into consideration: The water vapor line intensity in the sample

spectrum does not depend on the absolute residual water vapor

concentration in the spectrometer but on the different water vapor

concentrations during the background and the sample measurement.

Therefore, it is of crucial importance that the residual water vapor

concentration is (nearly) identical during both the background

measurement and the sample measurement.

E v a c u a t io n T ime

As mentioned above, water molecules are very polar. Due to this property, they tend to

stick at the inner wall of the optics compartment, even under vacuum. For this reason, a

long evacuation time is recommended. Ideally, the evacuation of the spectrometer

should not be interrupted overnight. This action will further reduce the residual water

vapor content.

E v a c u a t io n P r o c e d u r e

Before acquiring a background spectrum, simulate a sample exchange in the same way

as you will do it later for the real sample measurement:

1 Vent the sample compartment.

2 Afterwards, evacuate the sample compartment for about 5 to 10 minutes.

(An evacuation time longer than 10 minutes is not necessary because after

that period, the final pressure of < 0.2hPa (< 0.2mbar) will be achieved.)

Note: As soon as the pressure falls below < 1hPa, the message Sample

Evacuated, including the current pressure value, is displayed in the

Measuredialog window (figure 26). The achievement of the final

pressure is also indicated by the VACUUM LED at the spectrometer

top side, i.e. this LED lights green.


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5 O P E R A T I O N


Important Note:The evacuation times before the background measurement

and before the sample measurement have to be more or less

identical. To ensure reproducible evacuation times, specifyin OPUS a Delay before Measurement. See the figure 27.

3 Acquire a single channel background spectrum.

4 Afterwards, vent the sample compartment and place the sample in the

sample compartment.

5 Evacuate sample compartment for about 5 to 10 minutes.

6 Acquire a single channel sample spectrum.

Figure 26: OPUS dialog window Measurement- page Basic

Current state inside the

individual compartments,

including the current pres-

sure reading


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O P E R A T I O N

Purging the Spectrometer

Note: Take into account that the intensity of the water vapor band in the

sample spectrum does not depend on the absolute residual water

vapor concentration but results from a water vapor concentration

difference during the background and the sample measurement.

With the above described operation conditions and a spectral resolution of 4cm-1, typi-

cally a residual water vapor band intensity in the range of significantly less than 0.1%T

can be achieved.

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P U R G I N G T H E S P E C T R O M E T E R


Purging the spectrometer is not necessarily required, especially when you perform

measurements under vacuum conditions. However, if the spectrometer is not evacu-

ated, purging is recommended, especially when you frequently open the compartmentcovers (e.g. due to a detector or beamsplitter replacement or a sample substitution) or if

the ambient air humidity content is too high because this measure reduces the level of

water vapor, CO2or other components of the ambient air inside the spectrometer.

Note: Water vapor, CO2and other atmospheric contaminants cause

unwanted absorption. Therefore, open the sample compartment, the

detector compartment and/or the interferometer compartment only if

necessary in order to prevent water vapor, CO2 or other contaminants

from entering the above mentioned compartments.

Figure 27: OPUS Measurement dialog

Specifying themeasurement

delay time


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5 O P E R A T I O N


Purge the spectrometer, for example, with dry air or low pressure nitrogen gas. Provide

the following purge gas conditions:

Dry (dew point < -40C corresponds to a degree of dryness of 128ppm humidity),

oil-free and dust-free air or nitrogen gas

Maximum pressure of 2 bar (29 psi) Initial purge gas flow rate should not exceed 500 liters/hour

Sustained purge gas flow rate should not exceed 200 liters/hour

Danger: Do not use flammable gases for purging the spectrometer. Some

spectrometer components become very hot during operation. If

flammable gases come in contact with hot components there will

be the risk of fire and/or explosion!

For information about how to connect the spectrometer to a purge gas supply line, refer

to chapter Installation.

If you want to purge an enclosed accessory (e.g. micro ATR unit) you have to cover the

opening, which is also intended for evacuating and venting the sample compartment

(see figure 28), using the supplied cap in order to ensure a sufficient purge of the

accessory. Put the cap over opening and screw on the cap.

Attention: If you want to perform measurements under vacuum conditions

do not forget to remove this cap again! Otherwise, the evacuation

of sample compartment via the small purge gas inlet in the Quick-

Lock clamping device (figure 28) will take too long causing a red

VACUUM LED after a certain period of time.

This opening is intended for evacu-

ating, venting and purging the sam-ple compartment.

Purge gas inlet for purging an enclosed accessory

mounted on a QuickLock baseplate

Figure 28: Sample Compartment

Cap with screw thread


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O P E R A T I O N


Control l ing the F laps

VERTEX 70v is primarily designed for vacuum operation, but it can be purged as well.

To activate the purge mode, select in the OPUS Measuremenu the Optic Setup and

Servicefunction. Click on the Devices/Optionstab and make sure that the Purge Mode

check box is activated. See figure 29.

This operating mode allows you to control (open and close) the flaps in order to purge

either the sample compartment or the optical bench or both. The flaps are controlled viathe OPUS software. The corresponding buttons are at the Basicpage of the Measure-

mentdialog window. See the following figure.

Figure 29: Activating the Purge Mode

Purge mode is

activated.

Current state of the

flaps

Next possible action

that can be performedby clicking on this

button.

Figure 30: Controlling the Flaps


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5 O P E R A T I O N

Exchanging the Beamsplitter

The flaps can be opened or closed only if the pressure difference between the sample

compartment and the optical bench is below the threshold value of 5 hPa.

Specia l Case

Besides the normal purge mode in which the optical bench and/or the sample compart-

ment are only purged, the following special case is also possible: the vented sample

compartment is purged while the optical bench is evacuated. For the realization of this

special case, the spectrometer needs to be equipped with windows mounted on either

the sample compartment walls or the flaps which are closed in this case. To realize this

special case, proceed as follows:

Make sure that the purge mode is deactivated in OPUS. (See figure 20.)

Evacuate the optical bench and the sample compartment. (See chapter Opera-

tion, section Evacuating and Venting the Spectrometer.)

Afterwards, vent the sample compartment again. (In this condition, the flaps are

closed.)

Connect a hose to the purge gas inlet for the sample compartment. (The purge

gas inlet is at the spectrometer rear side. See chapter Installation, section Con-

necting VERTEX 70v to the Purge Gas Line, figure 7.)

Now start the purge gas supply.

Note: The flaps isolate the sample compartment hermetically from the

optical bench.

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The standard version and the optional version of VERTEX 70v differ from each other

with regard to the interferometer compartment cover design (see fig. 33a and 33b) and

the availability of the beamsplitter storage positions (see fig. 31) inside the interferome-

ter compartment.

Feature Standard Version Optional Version (S239/V)

Interferometer compartment

cover design

A beamsplitter exchange

requires the removal of the

complete interferometer com-

partment cover.

Wing-shaped cover provides

for easy access to the beam-

splitter.

Availability of the beamsplitter

storage positions inside the

interferometer compartment

No Yes


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O P E R A T I O N


The standard spectrometer version is equipped with a MIR beamsplitter (made of KBr).

If your measurement requires a different spectral range, you can exchange the beam-

splitter manually. For a list with all available beamsplitters (including their spectral

ranges) refer to chapter Overview, section Internal Components.

Note: Make sure that the spectral ranges of the installed optical

components (source, beamsplitter, detector and samplecompartment windows, if installed) correspond with each other!

Changing the beamsplitter is easy because a precise locking mechanism automatically

fixes the beamsplitter at its pre-aligned position, as soon as you move the release lever

(figure 34)into the locked position (i.e. backward).

All beamsplitters for VERTEX 70v are electronically coded enabling the spectrometer

firmwareto auto-detect the beamsplitter type. The information about the component is

passed on to the OPUS software. This feature is called ACR (Automatic Component

Recognition)1. Its purpose is to prevent you from selecting a wrong component in

OPUS when you set up a measurement. (Note: A wrongly selected component is indi-cated in OPUS by a red colored entry field of the corresponding drop-down list. See

also the OPUS Reference Manual.)

1. ACR is restricted only to the optical components beamsplitter, detector and source.

Figure 31: VERTEX 70v - Beamsplitter Installation Positions (only In case of option S239/v)

Beamsplitter(Operating position)

Two additional Beamsplitters

(Storage position)

Knob

Wing-shaped

cover


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5 O P E R A T I O N


Handl ing Instruct ions

Caution: The beamsplitter is a very delicate component. Handle it with

utmost care and observe the following handling instructions to

ensure a long service life.

Do not touch the beamsplitter surface as this will damage the surface and, as a

consequence, the beamsplitter may become useless. Hold the beamsplitter using

always the handle (figure 32).

Some beamsplitter materials are hygroscopic. Never expose them to humidity or

water vapor. Store the beamsplitter either in a dry and sealed container (e.g. in the

beamsplitter storage box) or inside the spectrometer (storage position, figure 31).

Do not try to loosen or fasten the screws as this will impair the optical quality of the

beamsplitter and lead to malfunctions.

Do not try to clean the beamsplitter. Do not expose the beamsplitter (especially beamsplitters made of KBr) to temper-

ature changes.

Figure 32: Beamsplitter

Handle


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O P E R A T I O N


Exchange Procedure

1 The procedure for gaining access to the beamsplitter depends on the

interferometer compartment cover design. Standard cover(fig. 33a): Take

off the complete cover. Optional cover (fig. 33b): Turn the knob counter-

clockwise until the stop and rotate the wing-shaped cover aside as shown in

figure 31.

Caution: Class 2 laser radiation. When the cover is removed do not stare

into the laser beam.

2 Move the release leverinto the unlocked position (i.e. backward).

3 Carefully pull the beamsplitter straight upwards without catching an edge.

4 Take the other beamsplitter out of the storage position and insert it with the

electrical contacts facing to the front side (figure 34).

5 Push down the beamsplitter completely until you feel resistance.

6 Move the release lever into the locked position, i.e. forward. (See figure 34.)

Note: A beep indicates that the beamsplitter has been recognized by the

electronics. After a few seconds the spectrometer will start scanning.

7 Insert the beamsplitter, you have taken out of the operating position, either

into the storage position holder (figure 31) or store it in the intended box.

8 Standard cover: Place the cover on the interferometer compartment again.

Optional cover: Rotate the wing-shaped cover over the openings and

secure it by turning the knob clockwise.

9 Check whether a signal is detected and the optics works correctly. (For

detailed information refer to the OPUS reference manual.)

Figure 33: a) Standard Cover b) Wing-shaped Cover (in case of option S239/V)


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5 O P E R A T I O N

Exchanging the Detector

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E X C H A N G I N G T H E D E T E C T O R


The basic spectrometer configuration is equipped with a DigiTect DLaTGS detector. Ifyour measurement requires a different spectral range or another detector sensitivity you

can install another detector into the second detector position, which is an optional spec-

trometer feature, or exchange the installed DigiTect DLaTGS detector for another Digi-

Tect detector, such as a MCT with a higher sensitivity or a NIR detector. (For the list

with all available detectors including their spectral ranges refer to chapter Overview,

section Internal Components.)

Note: Make sure that the spectral ranges of the installed optical

components (source, beamsplitter, detector and sample

compartment windows, if installed) correspond with each other!

A removable cover provides access to the detector compartment. The dovetail detectormounting facilitates the exchange. A re-alignment is not necessary. All detectors for

VERTEX 70v are electronically coded, enabling the spectrometer firmware to auto-

detect the type of detector currently installed. This information is passed on to the

OPUS software. This feature is called ACR (Automatic Component Recognition)1. Its

purpose is to prevent you from selecting a wrong component in OPUS when you set up

a measurement. (Note: A wrongly selected component is indicated in OPUS by a red

colored entry field of the corresponding drop-down list. See also the OPUS Reference

Manual.)

1. ACR is restricted only to the optical components beamsplitter, detector and source.

Figure 34: Beamsplitter (Operating Position)

Release lever(in locked position)

Beamsplitter handle


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O P E R A T I O N

Exchanging the Detector

Exchange Procedure

1 Take off the detector compartment cover (E in figure 9).

Caution: If there is a MCT detector installed in the detector compartment

(including a vacuum-tight closure at the filling hole in the detector

compartment cover) the detector compartment cover can not be

taken off. In this case, do not try to remove the cover forcibly as

this may cause a spectrometer damage! Therefore, first screw off

the sealing adapter mating part (figure 39) before you take off the

detector compartment cover. (See chapter Operat ion, section

Cool in g an MCT Detector, subsection Detector Com partment

Cover Preparat ion Procedure.)

2 Loosen the locking screw (allen screw) that secures the detector using a

hex key (size 6mm). See figure 35. Depending on which detector you wantto remove, the allen screw is on the left or right side of the detector.

3 Pull the detector straight upwards out of the dovetail guide.

Caution: Remove the detector carefully in order not to damage the detector

and/or the mirrors.

4 Insert the other detector precisely into the dovetail guide and push the

detector downwards until you feel a resistance.

Figure 35: Detector Compartment

MCT detector

DLaTGS

detector

Moveable mirror

Locking screw

of the detector

installed inposition 1

Locking screw of

the detector in-stalled in position 2

Fixed mirror


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5 O P E R A T I O N

Cooling an MCT Detector

Note: A beep indicates that the detector has been recognized by the

electronics. The electrical connections are established automatically.

5 Fasten the allen screw slightly using a hex key(size 6mm).

6 Place the cover on the detector compartment. Make sure that the four

plastic pins in the corners at the bottom side of the detector compartment

cover engage into the corresponding hole of the spectrometer case.

Note: If there is a MCT detector in the detector compartment do not forget

to reinstall the vacuum-tight closure at the filling hole in the detector

compartment cover. For information about it refer to chapter

Operat ion, section Cool in g an MCT Detector, subsection Detector

Comp artment Cover Preparat ion Procedure.)

7 Check whether a signal is detected and the optics works correctly (For

detailed information refer to the OPUS reference manual).

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C O O L I N G A N M C T D E T E C T O R


To ensure operating ability, MCT detectors have to be cooled regularly with liquid nitro-

gen. The typical hold time depends on the detector. There are MCT-detectors with a

hold time of 8, 12 or 24 hours.

To fill the detector with liquid nitrogen you need neither to remove the detector from the

spectrometer nor even open the detector compartment. The supplied funnel facilitates

the filling in of the liquid nitrogen in the detector. See figure 40.

Detector Compartment Cover Preparat ion Procedure

In case the MCT detector has been delivered together with VERTEX 70v, the detector

compartment cover is already prepared for the funnel insertion. If you have ordered the

MCT detector at a later date you need to prepare the cover as described in the follow-ing.

In accordance with the number of detectors that can be installed in the VERTEX 70v

detector comp

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Vertex 70vs Manual

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