Instrument Technology

Instrument Technology

Measurement of Pressure, Level, Flow and Temperature

3rd Edition - May 1, 1974

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  • Author: E. B. Jones
  • eBook ISBN: 9781483144719

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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

  • Introduction

    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


Product details

  • No. of pages: 410
  • Language: English
  • Copyright: © Butterworth-Heinemann 1974
  • Published: May 1, 1974
  • Imprint: Butterworth-Heinemann
  • eBook ISBN: 9781483144719

About the Author

E. B. Jones

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