User Manual

tina03e1-b (2004-02) BPG400 v1.om 29
When the operating voltage is supplied (→ Technical Data), 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.
Gauge failures due to contamination are not covered by the warranty.
Deposits on the electrode system of the BA gauge can lead to unstable measure-
ment readings.
The degas process allows in-situ cleaning of the electrode system by heating the
electron collector grid to approx. 700 °C by electron bombardment.
Depending on the application, this function can be activated by the system control
via one of the gauges digital interfaces. The BPG400 automatically terminates the
degas process after 3 minutes, if it has not been stopped before.
The degas process should be run at pressures below 7.2×10
-6
mbar
(emission current 5 mA).
For a repeated degas process, the control signal first has to change from ON
(+24 V) to OFF (0 V), to then start degas again with a new ON (+24 V) command. It
is recommended that the degas signal be set to OFF again by the system control
after 3 minutes of degassing, to achieve an unambiguous operating status.
4.3 Putting the Gauge Into
Operation
4.4 Degas
Contamination