Inspection
Work Planning
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A periodic test performed to verify that a protective device or safety function continues to operate as intended.
A Proof Test is a planned inspection or functional test performed at specified intervals to verify that a protective device, safety instrumented function or other safety-related component continues to perform its intended function. Proof Testing is used to detect hidden failures that may not become apparent during normal operation, thereby maintaining the required level of functional safety.
Proof Testing verifies the continued effectiveness of safety-related equipment by identifying hidden failures before they compromise protection.
Proof Testing is a key requirement of functional safety standards such as IEC 61508 and IEC 61511 and is commonly applied to safety instrumented systems, emergency shutdown systems and protective devices.
A Proof Test periodically verifies that a safety function remains capable of performing its intended purpose, whereas routine operational testing confirms normal system operation.
Functional Safety; Inspection; Process Safety.
Oil and gas.; Petrochemical.; Manufacturing.; Power generation.; Industrial automation.
IEC 61511
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