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Title: Advanced Applications Of Telemetering Systems And Flow Computers
Author: Richard H. Cadmus
Source: 1975 International School of Hydrocarbon Measurement
Year Published: 1975
Abstract: This paper will be a discussion of digital telemetry techniques, utilizing both unidirectional and bidirectional systems. The application of gas flow computers to the systems will also be discussed. First of all, a review of analog telemetry techniques is in order before we proceed into digital telemetry. There are three basic types of analog telemetry used today. The first type is utilized over short distances, and usuallv limited to private circuits not exceeding 5000 feet. The system is utilized at such locations as compressor stations, regulator stations, etc. with telemetering of variables from the point of measurement into a central control panel. The system is called current telemetering where the variable to be telemetered is normally represented as a 4-20 m.a. d-c signal. Since the signal is two-wire transmission, power is required only at the receiving end, thus keeping the system sinple and keeping installation at a minimum. Pulse Duration Telemetry is the most common type of telemetry used in the gas industry. The output of a Pulse Dura tion type telemeter transmitter is normally a 3-12 second on time out of a 15 second cycle, with 3 seconds on representing 0% of the variable, and 12 seconds on representing 100%. The output signal is a dry contact, and this signal may be utilized to key a d-c telegraph circuit, a tone transmitter, or be utilized with time division multiplexing.

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