If container pressure gauges are used to monitor inert gas clean agents, what annual verification is required?

• A. They shall be replaced annually
• B. They shall be compared to a separate calibrated device at least annually
• C. They must be zeroed
• D. They must be recalibrated monthly

Answer: (B)

The main idea here is ensuring the accuracy of container pressure gauges used to monitor inert gas clean agents. Because gauges can drift over time, a regular check against a known reference is needed so readings truly reflect the actual storage pressure and, by extension, the agent delivery conditions.

The required verification is an annual cross-check against a separate calibrated device that is traceable to national standards. This direct comparison confirms the gauge’s accuracy within its allowable tolerance and helps prevent misreadings that could affect system performance. It’s not about replacing the gauge each year, zeroing the instrument, or monthly recalibration; the standard specifically calls for this annual comparison to a calibrated reference.