INFICON Gemini ATM to Ultra-High Vacuum Gauge - Manual (Page 38)

38 tina83e1-a (2014-02)
6 Maintenance, Repair
Gauge failures due to contamination and wear and tear,
as well as expendable parts (e.g. ionization chamber,
ignition aid, Pirani filament (MPG50x)), are not covered
by the warranty.
INFICON assumes no liability and the warranty becomes null
and void if any repair work is carried out by the end-user or third
parties.
6.1 Adjusting the Gauge
MAG50x
The gauge is factory-calibrated and requires no maintenance. In
the event of a defect
• only replace the ionization chamber and ignition aid, or
• replace the measuring chamber cpl. (spare sensor).
MPG50x
The cold cathode measuring circuit, which is dominant for low
pressures (<1×10
-3
mbar), is factory-calibrated and cannot be
adjusted. The HV adjustment of the Pirani measuring circuit is
carried out automatically by the gauge itself at pressures
<1×<10
-5
mbar. The new zero point is saved non-volatile every
15 minutes. Any adjustment has a negligible effect on the pres-
sure range between approx. 10
-2 mbar and 10 2 mbar.
If used under different climatic conditions, through extreme tem-
peratures, aging or contamination the characteristic curve can be
offset and a manually readjustment or a maintenance may be-
come necessary.
An adjustment via the button can become necessary
(procedure
→  , ), if pressure values <10
-2
mbar are no longer
output.