In determining the end time of a regeneration failure, when is the end time established?

• A. When the temperature returns to safe level.
• B. When the first ambient temperature is taken.
• C. When the last item is tested.
• D. When the power is restored.

Answer: (B)

The moment the ambient temperature is first measured serves as the anchor for the end time of a regeneration failure. This first ambient reading provides an objective, reproducible timestamp that marks when the environment begins being monitored again after the failure. It lets you calculate how long the failure lasted and sets a clear reference point for subsequent checks and re-validation. Waiting for the temperature to return to a safe level, waiting until the last item is tested, or waiting for power to be restored all depend on later events and can vary, whereas the initial ambient temperature measurement gives a consistent, earliest marker for ending the failure period.