Kurt J. Lesker 979 Series, Operation And Maintenance Manual

Page: 42 / 54

42 Series 979 ATV Transducer
Bakeout/Sensor Replacement
CAUTION: Disconnect the power supply before disassembly!
Lethal voltages and currents may be present while the circuit is
operating. Only a qualified technician should replace or adjust
electronic components.
Bakeout
If building the system for the first time, or after performing routine
maintenance, the system may need to be baked out to remove any water
vapor.
The sensor can be baked out to 100
o
C (maximum) with a metal seal flange
(CF) or with a Viton® seal flange (KF). To bake out the sensor, first remove
the electronics. To do this:
1. Disconnect the cable from the 979.
2. Remove the four screws (as shown in the figure on the next page). The
screws may be difficult to access when the sensor is attached to the
vacuum system.
3. Pull the metal housing and the electronics from the sensor. The bottom
panel remains attached to the sensor. Avoid removing the other four
screws, two jack screws, top panel, and electronics that leave the
housing attached to the sensor. The housing has labels that may come
off, discolor, or burn at temperatures above 60
o
C. NOTE: Leave the small
circuit board in place.