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Operations
There are two ways to determine if the sensor is operating/properly functioning.
Reminder: When the unit is first powered on, the unit will take 3-5 minutes to control. Typically, the unit goes
through what we call an ARC condition. Which is a balancing cycle, the unit initial heats up, then goes into an
acquiring mode (hunting for the dew point) and then the control mode.
1) If you are using the RS232, output you can view the data via your computer to see if the unit is in control.
The data will be streamlined on your PCs and you will see the word "control" at the end of each line.
2) Another method is by viewing the red light on the PCB. If the red light is in a steady state (always on), the
unit is in control.
3) If the red light is blinking, the unit is most likely in one of these three states.
a. The unit was just powered on and is going through its ARC cycle for 3-5minutes.
b. The mirror is dirty (has contaminants on it) and it needs to be cleaned. Refer to the clean mirror
procedure.
c. If the above 2 steps do not remove the blinking red light condition, the unit could be out of range to
measure that dew point/frost point. (Ex: if your ambient condition is 25C and your dew points is
below -20C, the unit can not measure that dew point (red light will blink). A way to correct that is to
lower the body temperature of the sensor to a point where the dew point is measurable with this unit.
Clean Mirror
1) Power down
2) Gain access to the mirror
3) Clean mirror with a wetted (using isopropyl alcohol) cotton swab.
4) Dry the mirror surface with a dry cotton swab.
5) Reinstall sensor shield if applicable.
6) Power the CMDP on
7) Also, the mirror can be cleaned during the ARC (when red light is blinking) by following the above steps 2- 5
mirror
Control light
7
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