A verification sensor must prove its performance with no interruption of power for at least how many minutes?

A verification sensor must prove its performance with no interruption of power for at least how many minutes?

• A. 1 Minute
• B. 5 Minutes
• C. 10 Minutes
• D. 2 Minutes

Answer: (D)

The test focuses on the device’s ability to keep functioning during a brief power loss. You want the verification sensor to demonstrate it can run its self-check and keep outputs active even when external power is unavailable, using its internal backup power for a sufficient period. Two minutes is chosen because it gives enough time for the verification routine to complete and for any indicators or alarms to stay active during a short outage, without requiring an unnecessarily long interruption. One minute may be too short for a full verification to complete, while longer durations (five or ten minutes) aren’t typically needed for routine verification and would unnecessarily tax the backup power.

The test focuses on the device’s ability to keep functioning during a brief power loss. You want the verification sensor to demonstrate it can run its self-check and keep outputs active even when external power is unavailable, using its internal backup power for a sufficient period.

Two minutes is chosen because it gives enough time for the verification routine to complete and for any indicators or alarms to stay active during a short outage, without requiring an unnecessarily long interruption. One minute may be too short for a full verification to complete, while longer durations (five or ten minutes) aren’t typically needed for routine verification and would unnecessarily tax the backup power.