A device translating the signal produced by a primary sensing element (PSE) into a standardized instrumentation signal such as 3-15 PSI air pressure, 4-20 mA DC electric current, Fieldbus digital signal packet, etc., which may then be conveyed to an indicating device, a controlling device, or both.
Similar Basic Questions in Industrial and Control Systems Engineering:
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Reference and Further Reading: Basics of Industrial Instrumentation Handbook