Replacing The Sensor Mirror - GE Optica Operator's Manual

Chapter 7. Maintenance

7.2.1 Replacing the Sensor Mirror

torque driver, set to 20-30 inch-ounces of torque. GE type
Required equipment:
The kit supplied by GE contains the replacement mirror, a container of white thermal compound for proper heat
transfer, and (in some models) a mylar washer that is to be placed under the mirror. To install the replacement mirror,
complete the following steps:
1. Deactivate the sensor cooler, using one of the following actions:
•
Turn the sensor power off
•
Place the sensor switch to heat
•
Disconnect the sensor cable
2. Turn off the sample gas. Make sure the sensor cavity is depressurized before continuing with the next step.
3. Open the sensor by removing the sensor cover.
4. Unscrew and discard the old mirror, using a 3/16-inch (0.187) hex socket.
5. Use a toothpick or similar tool to place a small amount of thermal compound in the hole supporting the mirror.
CAUTION! Do not
use an amount large enough to leak out when the mirror is tightened.
Do not
allow any compound to get on the mirror surface, as it is very difficult to remove completely.
Do not
6. Carefully screw in the new mirror and tighten to the proper torque as specified for the particular sensor.
7. Carefully clean the mirror surface, using a cotton swab and the GE cleaning solution supplied with the
maintenance kit. Distilled alcohol or diluted alcohol is also acceptable.
8. 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 hour or two.
80
apply thermal compound to the mirror stem.
is recommended.
TW-1
Optica™ Operator's Manual