BG 5171 BEN / B (2017-02) PBR 260.oi 19
5 Maintenance
DANGER
DANGER: contaminated parts
Contaminated parts can be detrimental to your health.
Before you begin to work, find out whether any parts are contami-
nated. Adhere to the relevant regulations and take the necessary
precautions when handling contaminated parts.
The gauge is factory calibrated. If used under different climatic conditions or in a
different position, through aging or contamination (→ 18), and after exchanging
the sensor (→ 23), the characteristic curve can be offset and readjustment may
be necessary. Only the Pirani system can be readjusted.
The Pirani system is automatically adjusted by the hot cathode system when the
gauge is activated (i.e. as soon as the pressure range 1 … 3×10
-3
hPa is reached).
• Pin approx. ø1.3 × 50 mm (e.g. a bent open paper clip)
Operate the gauge for approx. 10 minutes at atmospheric pressure. If the
gauge was operated before in the hot cathode range, a cooling-down time
of approx. 30 minutes is to be expected (gauge temperature = ambient
temperature)..
Insert a pin through the opening marked <ATM> and push the button inside
for at least 5 s.
A zero point adjustment is recommended
• after the sensor has been exchanged
• as part of the usual maintenance work for quality assurance
5.1 Maintenance
5.2 Adjusting the Gauge
Adjustment under high vacuum
conditions
Adjustment at atmospheric
pressure
Required tools
Procedure
Zero Point Adjustment
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