INFICON HPG400 ATM to High-Vacuum Gauge - Manual (Page 3)

tina31e1 (2004-05) HPG400 v1.om
3
The HPG400 gauges have been designed for vacuum measurement of non-flam-
mable gases and gas mixtures in a pressure range of 2×10
-6
… 1 mbar. The con-
trol range of the gauge allows trend display from <1 mbar to 1000 mbar.
The gauges can be operated in connection with the INFICON Vacuum Gauge
Controller VGC4XX or with other control devices.
The HPG400 functions with a HP (high pressure) hot cathode ionization manome-
ter, which is controlled by the built-in Pirani manometer (control range). The hot
cathode is switched on only below the switching threshold of
≈1 mbar (to prevent
filament burn-out). For pressures above this threshold, the Pirani signal is output.
Over the whole measuring range, the measuring signal is output as logarithm of the
pressure.
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