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Instrument Technology - 3rd Edition - ISBN: 9780408705356, 9781483144719

Instrument Technology

3rd Edition

Measurement of Pressure, Level, Flow and Temperature

Author: E. B. Jones
eBook ISBN: 9781483144719
Imprint: Butterworth-Heinemann
Published Date: 1st May 1974
Page Count: 410
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Instrument Technology, Volume 1 focuses on the instruments used in the measurement, recording, and control of critical variables in industrial processes. More specifically, measurements of pressure, liquid level in a tank or vessel, flow, and temperature are discussed. Instruments are classified according to the physical principle upon which they are based. The discussion begins by introducing the reader to the system of units of measurement used throughout the text. This topic is followed by four chapters, each dealing largely with the mathematics and physics of the instruments, which are classified according to the decimal system. The first chapter describes the principles on which the measurement of pressure and the transmission of force by a fluid depend. Before considering the actual methods of measuring pressure, the book first explains the difference between absolute and differential pressure. The second chapter discusses how the level of liquid in a tank or vessel is measured using direct methods and pressure-operated types. The third chapter focuses on the measurement of flow using quantity meters and rate-of-flow meters. The final chapter is concerned with temperatures measured on different thermometers and the two fixed points used to compare such measurements: the lower fixed point (ice-point) and the upper fixed point (steam-point). This book is intended for instrument and chemical engineers, as well as for students studying both craftsmen and technician courses.

Table of Contents


1 Measurement of Pressure

Absolute and Differential of Pressure Measurement

Methods of Measurement of Pressure

Pressure Measurement by Balancing Against

A Liquid Column of Known Density

A Known Force

The Stress Produced in an Elastic Medium

Other Methods of Measurement

Calibration of Pressure Measuring Instruments

Seals and Purge Systems

Protection of Pressure Measuring Instruments from Violent Pressure Surges and Pulsations

2 Measurement of Level

Direct Methods

Float-Actuated Mechanisms and Other Forms of Interface Detection

Pressure-Operated Types

3 Measurement of Flow

Quantity Meters

Rate of Flow Meters

For Liquids

For Gases

Pressure Differential Methods

Classification of Pressure Differential Methods of Measuring Flow

Constant Area: Variable Head Methods

Constant Area: Constant Head Methods

Variable Area: Constant Head Methods

Variable Head, Variable Area, Meters

Target Flow Meters


4 Measurement of Temperature

Scales of Temperature

Instruments for Measuring Temperature

Expansion Thermometers

Change-of-State Thermometers

Electrical Methods of Measuring Temperature

Simple Electronics

Electrical Resistance Bulbs



Measurement of the Electrical Variable

Radiation or Infra-Red Thermometers

Total Radiation Pyrometers

Optical Pyrometers

Photo-Electric Pyrometers

5 Appendix



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© Butterworth-Heinemann 1974
1st May 1974
eBook ISBN:

About the Author

E. B. Jones

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