Field Replacement Of The Sensor Mirror - GE HumiLab Operator's Manual

Field
replacement of
the sensor
mirror
40
Page
One advantage of using a GE General Eastern chilled mirror dew
point sensor is you can replace the mirror yourself. A sensor does
not have to go back to the factory for replacement of the reflective
surface, but of course you can return it for factory service if
desired. A mirror may require replacement for these reasons:
• The reflective surface may be gradually abraded by sharp par-
ticles.
• The mirror surface may be accidentally scratched or gouged
during use or cleaning.
Replacing the sensor mirror.
to 20-30 inch-ounces of torque. You can order a GE General
Eastern type TW-1 torque driver if needed.
1. Open the sensor by removing the sensor cover.
2. Unscrew the old mirror, using a 3/16-inch (0.187) hex socket.
Discard the old mirror.
3. The kit supplied by the factory contains the replacement mir-
ror and a container of white thermal compound for proper
heat transfer. Complete instructions are also included in the
kit.
4. Use a toothpick or similar tool to place a small amount of
thermal compound in the hole into which the mirror is tight-
ened. (Do not apply the compound to the mirror stem.) Do
not use an amount large enough to leak out when the mirror
is tightened. Do not allow any compound on the mirror sur-
face, as it is very difficult to remove completely.
5. Carefully screw in the new mirror and tighten to the proper
torque.
The mirror protrudes only about 1/16-inch above the surface.
Ensure that the hex socket does not slip off while tightening, as
this may mar the new mirror or mar the vapor barrier.
6. Carefully clean the mirror surface, using a cotton swab and
the cleaning solution supplied in the maintenance kit. Alter-
natively, you can use distilled water or diluted rubbing alco-
hol.
7. Replace the cover and return the sensor to normal operation.
Under some circumstances, a new mirror may operate in a
somewhat unstable manner for the first one to two hours.
Required equipment: Torque driver, set
Chapter 5 — Maintenance and Troubleshooting