T RC-1 31: What do each of these letters represent?
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What do each of the letters in TC-1 31 represent?
T: Temperature; R: Record; C: Control (adjustment). 131: Circuit number. Note: The instrument tag consists of a combination of letter codes and a circuit number. The first letter denotes the variable being measured, while the subsequent letters indicate the functions of the instrument ； Circuit numbers can be assigned by device or section (area), and are generally represented by three to five digits.
Reply to 1# Trace Elements: The answer was already given above. If you want more detailed information, you can refer to \"Functional Indicators and Graphic Symbols of Process Measurement and Control Instruments\", which provides explanations for various symbols.