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Title: Fundamentals Of Instruments
Author: Daniel R. Fulton
Source: 1985 Appalachian Gas Measurement Short Course
Year Published: 1985
Abstract: The instruments used in gas measurement and pressure regulation are classified in two basic categories (1) indicators and (2) recorders. As the name implies, an indicator shows the value of what is being sensed at the time you look at it. For instance, your wrist watch indicates the time of day. A meter index indicates the total amount of gas which has gone through a meter. A pressure gauge indicates the pressure in a gas line it could be a manometer or a dial gauge. Temperature gauges indicate the temperature of the gas and could be the glass stem thermometer or the dial gauge thermometer. Volume indicators may be something as simpie as a meter index or a more complex volume correcting instrument such as a BPI, Emcorector or Mercor III.

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