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Telemetering—The Electrical Transmission of Gage and Meter Readings

The word “telemeter,” strictly speaking, is not a new word but its use as referred to in this paper, and as now commonly used in the industry, is comparatively new. It combines the Greek word “tele,” meaning “far off,” with the word meaning “to measure.” As in the common use of our familiar words “telegraph” and “telephone,” the meaning of telemeter as here used is limited to the electrical means of performing the operation, and thus it means to measure from far off electrically—that is, to transmit measurements electrically over wires. These measurements may be any measurements which can be shown on a gage or meter, such as water level, pressure, gallons per minute, volts, valve positions, temperature and others without limit. The electrical transmission of gage and meter readings is an operation which can be usefully adapted to many kinds of business. Electric light and power companies use it to transmit electrical instrument readings from outlying parts of their systems into central stations, oil and gas pipe line companies find it useful for transmitting pressure and flow indications to central controlling points, gas and steam distribution companies govern the operation of their plants by means of pressures telemetered in from distant portions of the systems, and other uses for telemetering may be found in many other fields. It is the intention in this paper to discuss the subject only with relation to its application to the water works industry and to consider it particularly from the viewpoint of the water works engineer and operator. The larger part of the development in telemetering equipment has come within the past ten years or so. About twelve years ago, when the writer first had occasion to work with such equipment, there was a very limited choice of types of apparatus or