When are the modifiers used in the letter codes of measured variables and instrument functions?
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The first letter of the letter, the following letters, the measured variable or the triggering variable, the modifier, the readout function, the output function, the modifier A, the analysis, 5, the alarm, the burner, the flame for selection, for selection, for selection, for selection, for selection, for selection, for selection, for selection, for selection, for selection, for selection, for selection, for selection, C conductivity control, D density difference, generally when to use modifiers.
For example, PDI101 refers to pressure difference indication, and D is a modifier!
For example, FIAH traffic indicates high reporting, and H is the modifier.
Haha, I understand, thank you everyone
For detailed regulations, please refer to "Functional Symbols and Graphical Symbols of Process Measurement and Control Instruments" HG/T 20505-2000, which explains it in detail and also provides examples of commonly used modifications.