GE Moisture Image 1 Series Service Manual page 70

June 2003
Aluminum Oxide Probe
Maintenance (cont.)
A-8
6. Repeat steps 3-5 for the protective shield. During this process,
swirl the shield in the solvents to ensure the removal of any
contaminants that may have become embedded in the porous walls
of the shield.
7. Carefully replace probe's protective shield, making sure not to
touch the sensor.
8. Connect the probe cable to the probe, and record the dew point of
the ambient air, as in step 1. Compare the two recorded dew point
readings to determine if the reading after cleaning is a more
accurate value for the dew point of the ambient atmosphere.
9. If the sensor is in proper calibration (±2°C accuracy), reinstall the
probe in the sample cell and proceed with normal operation of the
hygrometer.
10. If the sensor is not in proper calibration, repeat steps 1-9, using
time intervals 5 times those used in the previous cleaning cycle.
Repeat this procedure until the sensor is in proper calibration.
A trained laboratory technician should determine if all electrically
conductive compounds have been removed from the aluminum oxide
sensor and that the probe is properly calibrated. Probes which are not
in proper calibration must be recalibrated. It is recommended that all
moisture probes be recalibrated by GE Panametrics approximately
once a year, regardless of the probe's condition.
Application of the Hygrometer (900-901D1)