INFICON VGC401 Single-Channel Controller - Manual (Page 34)

34
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