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Inverted Magnetron Pirani Gauge FRG-700 FRG-702
4.3
Adjusting the Gauge
The gauge is factory-calibrated. If used under different climatic
conditions, through extreme temperatures, aging or contamina-
tion, and after exchanging the sensor, the characteristic curve
can be offset and readjustment may become necessary.
The cold cathode measurement circuit, which is dominant for low
pressures (<1×10
trast, the Pirani measurement circuit can be adjusted. Any ad-
justment has a negligible effect on the pressure range between
approx. 10
If you are using a seal with centering ring and filter, check
that they are clean or replace them if necessary ( "Dein-
stallation").
Activate the gauge.
Evacuate it to p << 10
Turn the nameplate counter-clockwise until the mechanical
stop is reached.
-3
mbar), is factory-calibrated. By way of con-
-2
2
mbar and 10
mbar.
-4
mbar and wait at least 10 minutes.
24
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