The medical air dew point high alarm from each compressor site will indicate at the master alarm panels when the line pressure dew point is greater than ____________.

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

Answer: (C)

Line pressure dew point shows how much moisture is in the compressed air. A higher dew point means more moisture, which can condense inside the piping or downstream equipment as the air cools, risking water contamination and equipment problems in a medical gas system. The master alarm is set to trigger when this dew point rises above a threshold that gives operators actionable warning before condensation becomes a real issue. Forty-five degrees? No—35°F is chosen because it provides a safe early alert: it’s high enough to indicate noticeable moisture presence, yet well before condensation is likely to form in the system under typical operating conditions. Values well below this (like -35°F or -22°F) would imply extremely dry air and wouldn’t alert misuse or moisture buildup; a value near freezing (like 32°F) might offer less margin and could miss moisture issues in cooler parts of the network. So, exceeding 35°F correctly signals there’s enough moisture to warrant action to protect downstream devices and patient safety.