Argon is a large molecule and if there is a large presence of Argon while you either a) cycle the unit (pump down and vent back to ATM) or b) hold the cold cathode at a higher pressure (10-4 torr) argon will sputter the ion chamber and literally erode it. If you are going to use copious amount of argon, it is suggested to either a) use a low current cold cathode or b) use a hot filament ion gauge.
Category: Instrumentation Gauging
Sub-Category: Cold Cathode Ion Gauges
Related Topics:
