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Advanced Regulatory Control by David W. Spitzer

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Transmitter Adjustments

The basic function of the transmitter in the regulatory control loop is to MEASURE THE DESIRED PROCESS VARIABLE, which, in the case of regulatory control, is the process variable that will be controlled. Due to the nuances of process measurement techniques and transmitter design, measuring the desired process variable is not as easy or as straightforward as it may seem.

Transmitter Calibration Range Most transmitters allow adjustment (calibration) of the process zero and process span, which correspond to the zero and span of the transmitted signal, respectively. Assuming these adjustments are made to the correct specifications in a technically correct manner, they still may be inappropriate with regard to their application ...

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