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Operation
38
GA 09.033/6.02 – (2011-07) –
©
Oerlikon Leybold Vacuum
Degas
Only for ITR 90, ITR 100 and ITR 200
ionization and ionization/Pirani vacuum gauges.
ITR 100 and ITR 200 gauges: Degas acts only
upon the active filament.
Contamination deposits on the electrode system of ioni-
zation vacuum gauges may cause instabilities of the
measurement values. The Degas function allows to
clean the electrode system.
Value
Ö
Normal operation.
Ö
Degas: The electron
collection grid is
heated to
≈
700 °C by
electron bombard-
ment and the elec-
trode system is thus
cleaned.
Duration of the Degas function:
3 min (can be aborted).
Lower/upper switching threshold
CENTER ONE has a switching function with two adjust-
able thresholds. The status of the switching function is
displayed on the front panel and can be evaluated via
the floating contact at the CONTROL connector
(
→
27, 26).