I’m asking everyone for the meaning of this PID diagram symbol
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What do the numbers and symbols inside the diamond frame mean?
Is it that 5A and 5A are interlocked, because the instrument numbers and interlock numbers cannot be the same?
For chains, isn’t there a format of I+number? Is this also considered a chain?
It’s that in this series of diagrams, there are many such numbers + letters
It is necessary to refer to the illustration on the home page to understand. It could be due to boundary zone division, pipe material/pipe grade/insulation changes. Not connected to the meter. It doesn’t look like an interlock instruction.