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Title: New Ideas In Measurement And Pressure Regulation
Author: Joseph A. Wager
Source: 1972 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1972
Abstract: An up-to-date compilation of equipment and techniques for the measurement and regulation of natural gas. MEASUREMENT 1. Maximum Demand Indicator Instrument This is a very simple instrument where the positive displacement (diaphragm, rotary or turbine) meter turns a wriggler, which in turn, causes a hand to drive up a scale. The greater the volume of gas, the more the wriggler turns and the farther up the scale the hand goes. As this driving hand goes up the scale, it automatically pushes, with its finger arrangement, the final readout hand indicating pointer. At the end of each day or hour, the driving hand is cycled back to zero at the desired time you set on the time indicator at the top. The final readout hand remains at the maximum location. Thus, this Maximum Demand Indicator is driven by the meter and timed by the clock. This Demand Indicator is driven by a single battery and will wind the clock every eight minutes for six to twelve months.

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