INFICON VGC401 Single-Channel Controller User Manual
Page 34
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tinb01e1-f (2011-07) VGC401.om
Contamination deposits on the electrode system of Hot
cathode gauges may cause instabilities of the meas-
urement values. The Degas function allows to clean the
electrode system.
BAG10X and BPG402 gauges: The Degas func-
tion acts only upon the active filament.
Available for:
Pirani
(PSG)
Pirani/Capacitive
(PCG)
Cold cathode
(PEG)
Cold cathode/Pirani
(MPG)
;
Hot cathode
(BAG)
;
Hot cathode/Pirani
(BPG)
Hot cathode/Pirani
(HPG)
Capacitive
(CDG)
;
Hot cathode/Pirani/Capacitive
(BCG)
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).
The VGC401 has a switching function with two adjustable
thresholds. The status of the switching function is
displayed on the front panel (
→
26) and can be evalu-
ated via the floating contact at the CONTROL connector
(
→
23).
4.5.1 Parameters
Degas
Lower/upper switch-
ing threshold