NAMUR
NAMUR NE 107
Self-Monitoring and Diagnosis of Field Devices
The recommendation that reduces the many diagnostics a smart field device produces to four condition states — failure, function check, out of specification and maintenance required — each with a defined symbol and a defined expectation of the operator. Its value to an integrity programme is that it makes device diagnostics actionable: a maintenance-required state belongs on a work list, while a function check state explains why a reading should not be trusted right now, and conflating the two is how diagnostic information gets ignored.
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