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Title: Meter Driven And Clock Driven Pvt And T Gauges
Author: Charles C. Bernitt
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: When natural gas is measured by means of a large positive displacement meter, some means of recording the pressure and temperature as well as the registration of the index is necessary if we want to know the actual volume of gas that has passed the meter. Several classes are held in different short courses as well as the Southwestern Short Course to explain the basic gas laws. The facts can be narrowed down to this: if we know the volume of gas at one condition of temperature and pressure, we can determine the volume at any other condition of temperature and pressure. A practical method of recording the changing conditions of the gas as it passes through a meter is by means of a pressure, volume, temperature and time recorder. Two different methods are used to record this information. One method is by using clock driven charts and the other is by means of a meter driven chart. When such an instrument is used to record volume, pressure, temperature, and time it is called a PVTT Recorder. Other names, such as V and P Recorder, etc. are also used depending on whether it contains a temperature system or not. Many old-timsrs simply refer to it as a gauge.

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