FG05W3 - Introduction to Pressure Measurement .pdf

7/29/2019 FG05W3 - Introduction to Pressure Measurement .pdf

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Standards

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Publishing

Conferences & Exhibits

ISA Seminars on the WebLive Experts on Hot Topics

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Certification

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Conferences & Exhibits

Introduction to LevelMeasurement

FG05W3 Version 1.3 2010


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Seminar Logistics

Seminar materials Downloadable presentation

Question and Answer session (audio and email)

Survey

Earn 1.5 Professional Development Hours (PDH)

Seminar length

90 minute total presentation

Three approximately 20 minute instructional presentations

Three approximately 10 minute question and answer sessions

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Audio Instructions

Please note the following during the seminar:

As a participant, you are in a listen-only mode.

You may ask questions via the internet, using yourkeyboard, at any time during the presentation.

However, the presenter may decide to wait to answeryour question until the next Q&A Session.

If you have audio difficulties, press *0.


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Audio Instructions for Q & A Sessions

Questions may be asked via your telephone line. Press the *1 key on your telephone key-pad.

If there are no other callers on the line, the operator willannounce your name and affiliation to the audience andthen ask for your question.

If other participants are asking questions, you will beplaced into a queue until you are first in line.

While in the queue, you will be in a listen-only mode untilthe operator indicates that your phone has beenactivated. The operator will announce your name and

affiliation and then ask for your question.

Introduction of Presenter

Instructor

Name: William (Tim) Shaw PhD, CISSP

Background/experience: Over 30 years ofexperience with computer based automation

systems including developing three

generations of DCS systems and twogenerations of SCADA systems. Former

Adjunct Professor in the GraduateEngineering department of Loyola College in

Baltimore. Authored books on Batch ProcessControl and on SCADA Cyber Security.

Currently the Senior Consultant for CyberSECurity Consulting, an industrial automationcyber security firm. Tim periodically teaches

courses for ISA and IEEE.

Email: [email protected]


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Goals of this Session

Explain the measurement principles, instrumentapplication and specifications to process conditions forlevel measurement

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Course Objectives

For successful completion of this course you will:

Describe the differences between point and continuous

measurement of level

List advantages and attributes of direct level measurementdevices

Define displacement and detail the operation of displacers for

level measurement

Describe hydrostatic head measurement and its uses in levelmeasurement

Explain various applications of hydrostatic head measurement in

level measurement Define zero elevation and suppression as applied to level

measurement


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Course Objectives (contd)

Describe the operation of various electronic level sensorsincluding:

Capacitance sensors

Conductive sensors

Ultrasonic sensors

Radar sensors

Describe the operation of alternate level measurement devicesincluding

Radiation sensors

Rotating Paddles

Thermal Sensing Level Measurement

Resistance Tapes

Gravimetric

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Section 1: Intro to Level Measurement Introduction to Level

Concepts of Level Measurement

Point Measurement

Continuous Measurement

Selecting Level Measurement Devices

Visual Level Sensors

Dipstick and Steel Tape

Sight Glasses

Float Actuated Devices

Variable Displacement Sensors

Principles of Buoyancy

Devices


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Introduction to Level

What is level measurement? Has a process fluid reached (exceeded) this point?

Between two fluids, where is the interface?

How much (volume) is in this vessel?

How fast is level falling (consumption) /rising (inventory)?

How deep is the water from the top?

At what point in the tank is the process material?

Levels are taken of process fluids, fluidized solids, andgranular solids

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Level / Inventory Measurement

How far from fullHow far from emptyHow much material

WHERE

HOWMUCH


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Dip Stick Level Measurement

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Sounding Line


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Sounding Bob

Motor/Cable Assembly

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Basic Sight Glasses


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Float & Cable Arrangements

SCALE

WEIGHT

FLOAT

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Stilling Well


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Tank Level Measurement

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Level Measurement by a Displacer


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Interface Measurement with Displacers

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Review of Key Points

Introduction to Level

Concepts of Level Measurement

Point Measurement

Continuous Measurement

Selecting Level Measurement Devices

Visual Level Sensors

Dipstick and Steel Tape

Sight Glasses

Float Actuated Devices

Variable Displacement Sensors

Principles of Buoyancy

Devices


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Live Question and Answer Session

During Q&A, questions may be asked via your telephone line.

Press the *1 key on your telephone key-pad.

If there are no other callers on the line, the operator willannounce your name and affiliation to the audience and thenask for your question.

If other participants are asking questions, you will be placedinto a queue until you are first in line.

While in the queue, you will be in a listen-only mode until theoperator indicates that your phone has been activated. Theoperator will announce your name and affiliation and then askfor your question.

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Section 2: Hydrostatic Head Devices

Head Pressure Measurement

Hydrostatic Pressure Applications

Open-tank Pressure Measurement Sensors

Closed-Tank Head Pressure Measurement Sensors

Dip Tube

Application


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Liquid Pressure

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Hydrostatic Pressure


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Open Tank Level

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Zero Suppression in an Open Tank


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Zero Suppression in a Closed Tank

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Zero Elevation in a Closed Tank


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Air Bubbler System

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Level Application


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Level Application (contd)

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Head Pressure Measurement

Hydrostatic Pressure Applications

Open-tank Pressure Measurement Sensors

Closed-Tank Head Pressure Measurement Sensors

Dip Tube


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While in the queue, you will be in a listen-only mode until theoperator indicates that your phone has been activated. Theoperator will announce your name and affiliation and then askfor your question.

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Section 3: Electrical Level Measurements Electrical Level Sensors:

Capacitance

Conductivity

Resistance

Ultrasonic Sensors:

Radar Sensors


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Capacitance Probe

LT

C

PROBE ONE:

PLATE OF

CAPACITOR

METAL WALL:

OTHER PLATE

OF CAPACITOR

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Conductivity Level Sensors


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Resistance Tape Level Sensor

LIQUID SURFACE

BASE STRIP

HELIX SHORTEDBELOW SURFACE

RESISTANCEHELIX

UNSHORTED

TO BREATHER

EQUALIZER

AD

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Ultrasonic Measurement


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Ultrasonic Parameters

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Radar (non-invasive)


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Radar Guided Wave

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Radiation Point Measurement

TWO GM-8GAMMA

SWITCHES

LOW LEVEL ALARMACTUATED WHEN BOTTOM

SWITCH DETECTS INCREASEDRADIATION DUE TO FALL

OF LIQUID


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Rotating Paddle

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RTD Thermal Switch

Using RTD sensors in a bridge arrangement to detect presence of liquid


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Heated Thermistor Level Switch

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Level Measurement by Weight


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Load Cell Trade-Offs

Advantages Non- Intrusive Mass measurement

Ok for liquids, granulars, and slurries

High accuracy in weight

Disadvantages Best specified when vessel is ordered Usually requires free standing structure

Only weight measurement, not level; requires temperature compensation May be affected by ice, snow, and wind loading

ApplicationsContinuousLiquidsGranulars

Slurries

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Electrical Level Sensors:

Capacitance

Conductivity

Resistance

Ultrasonic Sensors:

Radar Sensors

Rotating and Vibrating Paddles

Thermal Sensing Level Measurement

Resistance Tapes Nuclear Devices

Gravimetric Level Measurement


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While in the queue, you will be in a listen-only mode until theoperator indicates that your phone has been activated. The

operator will announce your name and affiliation and then askfor your question.

How Many People Are at Your Site?

Poll Slide

Click on the appropriate number indicating the number ofpeople that are at your site.


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Related ISA Courses

FG07 Introduction to Industrial Automation and Control

TC05 Tuning Control Loops

TS00 CCST Review Course

All ISA courses are available any time as on-site training

For more information: www.isa.org/training

or (919) 549-8411

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ISA Certifications

Certified Automation Professionals (CAP )

www.isa.org/CAP

Certified Control Systems Technician (CCST)

www.isa.org/CCST

Please visit us online for more information on any ofthese programs, or call (919) 549-8411.


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Please take our Web Seminar Survey

via Zoomerang

The seminar survey was sent to you via emailduring the seminar. Please do not forget tocomplete the Zoomerang survey.

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Conclusion

This is the end of:

Introduction to Level Measurement

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FG05W3 - Introduction to Pressure Measurement .pdf

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