In the context of the dew point alarm, which value triggers the master alarm when line pressure dew point is exceeded?

• A. +35°F
• B. -22°F
• C. -35°F
• D. +32°F

Answer: (A)

Dew point in a medical gas system reflects how much moisture is present in the gas; a higher dew point means more moisture and a greater risk that condensation could form in the downstream tubing or components. The master alarm is set to trigger when the line pressure dew point exceeds a safe limit, signaling that moisture levels are too high to safely continue operation. In this scenario, that limit is +35°F, so when the line pressure dew point reaches or goes above +35°F, the alarm activates. This threshold provides a proper warning before moisture could cause issues like condensate in the lines or contamination of the gas supply. Values that are much lower (very dry gas) or only slightly below the threshold do not represent the designated alarm trigger; thus +35°F is the correct setpoint.