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6.3.2 Cleaning FRG-702
Cleaning the measuring
chamber and the polarity
insert
Cleaning or replacing the
anode
Replacing the Pirani element
Inverted Magnetron Pirani Gauge FRG-700 FRG-702
Using a polishing cloth rub the inside walls of the measuring chamber and
the polarity insert to a bright finish.
The sealing surfaces must only be worked concentrically.
Rinse the measuring chamber and the polarity insert with cleaning alcohol.
Allow both to dry.
Remove the used ignition aid (10a) with pliers.
Using a polishing cloth rub the anode pin to a bright finish.
Do not bend the anode. Do not carry out mechanical work on the
ceramic part.
Rinse the anode with cleaning alcohol.
Allow the anode to dry.
Insert a new ignition aid (10a) into the mounting tool.
Carefully press the anode (clean or new)
centered and parallel to the tool axis into
the ignition aid and insert it to a depth of
approx. 15 mm. The final positioning is
established after the anode is installed.
Slide the screw fitting (13a) and the copper seal (13b) over the Pirani
element (13).
Mount the Pirani element ( 26).
25
Anode
Ignition aid
Mounting tool
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