Instrument tag issue LZAC

2017-05-10View Original

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On a flowchart, I saw a tag name labeled LZAC; I understand the meaning of the other letters, but I’m not sure what Z stands for. Could someone please give me some guidance?

Reply #22017-05-10

Check HG/T 20505-2014 for the functional indicators and graphic symbols of process measurement and control instruments

Reply #32017-05-10

This isn’t a proper designation... Review complete

Reply #42017-05-10

It seems to be the LV valve shutdown signal

Reply #52017-05-11

According to the provisions in \"HG/T 20505-2014 Functional Indicators and Graphic Symbols for Process Measurement and Control Instruments\", the letter Z is a modifier for the initial letter, indicating that it is a variable in an SIS system. The meaning of LZAC is: Level alarm control in the SIS system.

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Instrument tag issue LZAC

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