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Maintenance
No maintenance is required beyond periodic cleaning or replacement of a contaminated sensor. The
7ER is cleanable whereas the 7FR requires sensor replacement.
1.0 Disassembling the 7ER/7FR
1.1
Remove the sensor from the vacuum chamber.
1.2
Disconnect power from the sensor.
1.3
Remove the single flat socket screw from the bottom
of the sensor can.
1.4
Carefully slide the can away from the bottom flange,
until it is completely off.
2.0 Cleaning the sensor ( 7ER only )
2.1 Unscrew the cap to expose the anode assembly
(to remove, rotate cap counter clockwise).
2.2
Gently lift the anode assembly upwards to
separate if from the body.
2.3
Remove the “O” ring from the body, being
careful not to scratch the “O” ring seat. Wipe
it off with a lint free tissue making sure
that it is still intact (no cracks or tears).
It should be round and not flattened.
2.4
Blast the entire anode assembly and body at 30 psi using 70-140 mesh glass bead abrasive.
Scotch -Brite or polishing cloth also can be effective.
2.5 After cleaning, blow out any residual glass beads or dust with dry air.
2.6 Rinse with alcohol, followed with a rinse of de-ionized water.
2.7
Dry anode assembly and the body in a clean oven @ ~ 200° F.
2.8 Re-grease the “O” ring with Apiezon L or M Grease. (A vacuum approved grease).
DO NOT APPLY EXCESS GREASE. “O” ring should be shiny.
2.9
Install “O” ring in body..
2.10
Replace the anode assembly in the body after the “O” ring has been installed.
2.11
Screw the cap on and hand tighten.
CHAPTER 6
TELEVAC