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Title: Fundamentals Of Egm - Electrical Installations
Author: Michael D. Price
Source: 2005 American School of Gas Measurement Technology
Year Published: 2005
Abstract: The areas of gas measurement and communications have seen substantial changes in the last few years as the natural gas industry adapts to effects of the economy, fluctuating gas prices, warm winters and government deregulation. Every energy delivery company has studied, debated, hired consultants, and finally determined how gas flow data is to be measured and collected. All gas companies have hundreds and even thousands of points which must be accurately measured. Data is retrieved from very remote and rugged locations. Climate conditions can range from humid off-shore platforms to desert conditions with both temperature extremes included. No commercial power is available, allowed or even desired at these locations making the solar-powered electronic gas measurement equipment the ideal method of gathering flow data. Companies have standardized on one or more models of EGM equipment that meets its particular requirements. Its associated components usually include the computer, differential pressure transmitter, pressure transmitter, solar-panel, battery, and possibly a communications system of some type. This could be a modem for a telephone line, radio data system, or cellular data collection unit.The manufacturers of the solar-powered computers provide recommended installation procedures based upon agency approvals that they applied for. There are many other techniques that can be utilized to insure that optimum performance is realized from the EGM equipment. Solar-powered EGM equipment must use a low amount of power from the battery source in order to keep the PV system small enough to remain cost effective. Low power consumption makes the system a high impedance device. Solar-powered EGM equipment requires special attention to installation details for proper operation under most conditions. This paper will look at the installation of solar-powered flow computers of the most common configurations available. There are several recommendations presented to improve upon the manufacturers installation procedure based upon isolation, insulation, and grounding.

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