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"Oil-Less” Medical Air Medical Systems

Appendix C - Ceramic Dew Point Monitor

C.3 Operation

Although the correct operation of the sensor is not sample flow rate dependent, it is important to ensure that
flow velocity through the sample source to the sampling block is high enough to avoid long time lags in
response to changes in moisture at the sample source. BeaconMedæs has already installed an orifice to ensure
the proper flow velocity. However, this orifice should be checked occasionally to see if it has any blockage.

C.3.1 Alarms

The dew point monitor is provided with separate sets of alarm contacts (they share a "common" contact).
Alarm relays are normally energized. Dew points that exceed setpoints shall cause an alarm condition. Loss of
power will also cause an alarm condition. Alarm relays are rated for 5A @ 120V. When the dew point exceeds
the alarm set point, the relay contacts are de-energized.

Alarm relays remain de-energized until alarm condition is cleared.

WARNING:
Respond to alarm conditions immediately. An alarm condition on the dew point display indicates
a dew point level exceeding the maximum set point. Immediate action should be taken to reduce
the possibility of high dew point in the Medical Air line. Prolonged exposure to condensing
moisture can damage medical equipment.

C-3