The DXN Portable Ultrasonic Flow Meter

DXN Ultrasonic Portable Flow Meter

www.bellflowsystems.co.uk

TFXP 902 Energy Wall Thickness

New Portable

DXN, the portable meter for all applications


DXN Ultrasonic Portable Flow Meter Kit


• Touch screen• Small pipe variable

separation distance sensor• Hybrid Transit Time

Doppler• Thumb drive data

download • Windows XP O/S

DXN Key innovations for Dynasonics


• Touch Screen input• Hybrid Transit Time Doppler

automatically switching• Windows XP O/S, software

upgradeable from USB port• ModBus TCP/IP, Ethernet• Cable + system integrity test

DXN unique innovations in market


• Building Automation /Energy Mgmt.

• Industrial and process• Water and municipal• Oil & Gas• Marine and offshore

Key markets


DXN Portable Flow Meter - System• Measurement Type: Ultrasonic transit time and Doppler Hybrid operation.

Liquid thermal energy and Pipe wall thickness gauge

• Velocity Range: Transit Time: Bi-directional to 12 MPS, Doppler: Uni-directional to 12 MPS

• Flow Rate Accuracy: Transit Time: ±1% of reading, Doppler: 2% of full scale

• Flow Sensitivity: 0.001 MPS

• Repeatability: ±0.1% of reading

• Measurement Update: 0.1 Hz max

• Battery: Provides 6-9 hrs of continuous operation

• Display: 800 × 480 WVGA Colour Outdoor Readable Display; resistive touch screen

• Enclosure: Water/Dust resistant [IP 64]

• User Menu: Windows .NET fully integrated user menu; Multi-language

• Logging: 300 sites stored in 1 GB; downloads to USB jump drive


• DTTSU (2 MHz) Universal Small-Pipe System 12-60.3 mm OD

• DTTN (1 MHz) 50mm – 2500mm OD

• DTTL (500 kHz), 400mm – 3050mm OD

• DT94 (625 kHz), Doppler 25mm to 1524mm

• Thickness transducer

• Cable Length: Transit Time: 6 meter paired coaxial cable, BNC to BNC, Doppler: 6 meters paired coaxial cable, BNC to 4-pin

• Diagnostics: Open, Short, Nominal (transit time only)

• Pipe Thickness: Dual mode transducer with 6 feet (1.8 meters) of cable (BNC ends)

• RTDs: 2x platinum 385, 1000 Ohm, 3-wire PVC jacketed cable; 6 meter cable standard with quick connector

• Pipe Surface Temperature: DTTSU/DTTN/DTTL: -40 ºC to +121 ºC, DT94 Doppler: -40 ºC to+100 ºC, DTTH option 176 ºC


DXN Portable Flow Meter - Transducers

• Connector: 15-pin high-density DSUB breakout box .2" quick disconnect screw terminal; 15 pin to adapter box; 1.8 meters of cable (DSUB to DSUB connectors)

• Breakout box Inputs/Outputs: Energy/Temperature: 2x RTDs PT1000 tab type; -85 ºC to +300 ºC measurement range

• Current Output: 4-20mA active/passive 1% accuracy

• Digital Output: Open collector, External pull-up, Rate or Total pulse user selectable

• Digital Input: Totalizer reset

• Auxiliary Inputs: Voltage input. 0 – 5V or 0 – 10V, 1% accuracy

• Voltage Output: 0 – 5V or 0 – 10V output voltage, 1% accuracy

• USB Software upgrades via downloads from Thumb Drive, Thumb drive uploads of logged data

• MODBUS® TCP/IP


DXN Portable Flow Meter – In/Outputs

New DTTSU (2 MHz) Universal Small-Pipe System12-60.3 mm OD


DXN Portable Ultrasonic Flow Meter

Configuration

• Site storage/retrieval

• New site configuration• Operation mode• Transducer type• Pipe material• Pipe size – integrated charts• Fluid type – integrated charts• Engineering units• Flow ranges• Save/Name the site – Full QWERTY



Diagnostics• Cable/transducer integrity• Signal level• Signal graphics• Speed of sound• Plots Transit Time, Send and Receive signals, Noise and

Doppler Signal• Extensive measurements:

• Flow Stats: Signal Strength, Transit Time, Reynolds Number, AGC Level, etc.

• Battery stats: Time to Empty, Charge Time to Full, etc.• System stats: DSP CPU %, PC Memory & CPU,

Temperatures, etc.



Logging• 1GByte storage space available• Flow Rate + User can select up to 4 other parameters to log• “Ludicrous-speed” logs flow rate measurement + 1 other

measurement @ 100+Hz -- Limited to five minute bursts• User selection of what to log

• Flow Rate <default>• Flow Accumulator• Temperatures• Energy/Power• Fluid Sound speed• Etc.

• Graphical view on flow meter display• File storage, retrieval and download to USB Thumb Drive



What’s Inside?• 150 MHz Texas Instruments

TMS 320 DSP• Integrated 25 MHz, 12-bit ADC

• Up to 200 TT readings/second

• PC running Windows XP Embedded as the O/S



GUI• Wizards• Intuitive operation• Graphical instructions• No need for PC or other

software• Multi-language capable• Free graphing software

for data logged information for PC also included



Smart Li-ion Battery• PC-Like Power• Safe Charging (~ 6 hours

to recharge)• Safe Discharging• Temperature monitoring• Battery life gauge• Capacity:

• Screen On: ~6 Hours• Screen Low: ~8 Hours • Screen Off: ~9 Hours



Standard Accessories• Carrying case• Shoulder bag• I/O breakout box• AC/DC converter for charging/operation• 12 volt car power adapter



• Ultrasonic Flow: Principles of Operation• Transit Time• Doppler

• Installation

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Measurement Technology Overview

Transit time is also known as “Time of Flight” technology. Sound pulses are transmitted upstream and downstream between two elements mounted on the outside of the pipe. The two elements (transducers) alternate function between send and receive.

V-Mode Configuration


Transit Time Technology

Transit Time Pipe cut through side view

Steel

Transducers

Plastic

Line represents path of sound wave Liquid

Typical sound path for a TT clamp on ultrasonic meter


Measurement Summary Dynasonics transit time meters generate and transmit a

synthesized waveform in both the upstream and downstream directions; approximately 3x/second.

After the waveform is transmitted, a precision delay is induced; the length of the delay is based on parameters such as pipe size and pipe wall thickness.

The upstream and downstream data are collected and compared with one another to determine difference time ( Δt ).


Transit Time InstallationThree Mounting Modes for Series TFX Transducers

W-Mode V-Mode Z-ModeMount so that wires are in opposition


Transit Time Installation• Place the second transducer at the proper calculated

spacing and make small adjustments to achieve Signal Strength. Clamp the transducer at this position.


On very large pipes, small adjustments both lineally and radially may be required to achieve adequate signal strength (typically greater than 5). Also, slight twisting of the transducers can direct the sound.Note: higher signal strength does NOT correspond with higher accuracy


Transit Time Installation

Doppler Ultrasonic Technology

Ultrasonic frequencies in the range of 500,000 to 1,000,000 Hertz(500 kHz to 1 MHz) are generated by the flow meter and transmitted through the pipe wall into the liquid. The part of the flow meter that contacts the pipe is called the transducer.

25


Option 1: 180° is usually optimal, start with this set-up

Option 2: Side-by-side is appropriate for larger pipes, very high solids content (>10000 ppm) or when signal strength is very low

Transducer cables extend in the same direction as flow

Doppler Installation


Potential Complications Variable Frequency Drives (VFDs) are in use at the

majority of water and wastewater treatment plants and lifting stations. If installed without proper grounds and shields, VFDs may output frequencies that will interfere with proper operation of Doppler flow meters. VFD interference typically will cause erroneous readings – that are constant – to be shown on the meter’s display and outputs


Doppler Installation

Thank you


+44 (0)1280 817304 [email protected] www.bellflowsystems.co.uk

Date post:	19-Nov-2014
Category:	Engineering
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