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Switch or Transmitter in Safety instrumented System (Codes/Standars)

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As a starting point, this may be what you are looking for:
ANSI/ISA-84, Functional Safety: Safety Instrumented Systems for the process Industry Sector
 
Thank You for your answer [smile] in ANSI/ISA-84 (Functional Safety: Safety Instrumented Systems for the process Industry Sector) it's montionned in N.8.3 Sensor selection criteria that Analog devices are generally preferred to discrete devices because the use of the analog signal allows for online detection of device faults.

It's a good starting point, as you said, thank you very much

Best regards.
 
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