INFICON HPG400 ATM to High-Vacuum Gauge - Manual (Page 26)

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tina31e1 (2004-05) HPG400 v1.om
Gauge failures due to contamination are not covered by the warranty.
The HPG400 is designed in such a way that contamination by process products is
minimal. The baffle and the closed internal design of the measuring system as well
as the heat generated by the measuring system contribute to this.
The HPG400 is factory-adjusted in such a way that the hot cathode is switched on
at
≈1 mbar. A lower threshold can be set in order for the contamination of the sys-
tem to be reduced (
→ 25). The gauge can also be switched externally by the
supply voltage, control by the Pirani still being insured.
In case of severe contamination, the measuring system should be replaced
(
→ 42).
When the operating voltage is supplied (
→ "Technical Data", 8 and "Electrical
Connection", 16), the output signal is available between Pin 2 (+) and Pin 12 (–)
of the sensor cable connector (Relationship Output Signal – Pressure
→ Appendix A).
Allow for a stabilizing time of approx. 10 min. Once the gauge has been
switched on, permanently leave it on irrespective of the pressure.
Communication via the digital interfaces is described in separate sections.
Contamination
4.3 Putting the Gauge Into
Operation