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Title: The Use Of Manometers In The Gas Industry
Author: A. A. Hejduk
Source: 1956 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1956
Abstract: The manometer is an accurate and simple pressure measuring instrument widely used in the gas industry. It is a primary standard used in measuring pressures, vacuums, and differential pressures of but a fraction of an inch of water or several pounds per square inch. One must not lose sight of the fact that a manometer is a base or primary standard. By primary standard we mean that the unit is a base reference or measuring yardstick which will be used in observing certain conditions or results. In measuring pressures with the manometer, we are comparing an unknown pressure which we are seeking with that of our measuring standard manometer reading - or in other terms, comparing the unknown with the known. Many instrument men classify a dial type pressure gauge as a primary standard of measurement. This type of gauge being a mechanical unit having cams, gears, levers or bellows, is correctly termed as a secondary standard, or a unit of measure which is not a base primary standard.

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