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Title: Basic Applications Of Telemetering Systems Em 3050
Author: Michael Massey
Source: 2000 International School of Hydrocarbon Measurement
Year Published: 2000
Abstract: Telemetering is the process of transferring data, measured, calculated, or monitored data, over a distance or from point A to point B. One of the first forms of telemetry developed was used to determine pressures and flows of natural gas pipelines. It was popular during the 70s and 80s. This type of telemetering used a process known as pulse duration. Pulse duration is a process of a pulse being transmitted over a set period of time to indicate a variable. For example the first times were based on a 3-15 second time interval. A 3-second pulse provided a measure of 0% of scale and a 12- second pulse provided a measure of 100% of scale. Why start at 3 seconds? This provided for a true 0, if the pulse was less than 3 seconds the processor could determine that the value was actually less than 0%. The 15-seconds provided for a true 100%. These pulses were usually passes through dedicated phone circuits to a central point where the data was presented in the form of charts on recorders for monitoring. This was a great improvement over previous operating schemes because it provided real time data. The data accuracy varied however due to temperature and distance of the wiring used for transmission.

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