INFICON BPG400 ATM to Ultra-High Vacuum Gauge - Manual (Page 47)

tina03e1-b (2004-02) BPG400 v1.om
47
6 Maintenance, Repair
DANGER
Caution: contaminated parts
Contaminated parts can be detrimental to health and environment.
Before beginning to work, find out whether any parts are contaminated.
Adhere to the relevant regulations and take the necessary precautions
when handling contaminated parts.
Small deposits on the electrode system can be removed by baking the anode
(Degas
→ 29). In the case of severe contamination, the baffle can be exchanged
easily ( → 17). The sensor itself cannot be cleaned and needs to be replaced in
case of severe contamination ( → 51).
A slightly damp cloth normally suffices for cleaning the outside of the unit. Do not
use any aggressive or scouring cleaning agents.
Make sure that no liquid can penetrate the product. Allow the product to
dry thoroughly before putting it into operation again.
Gauge failures due to contamination are not covered by the warranty.
The gauge is factory-calibrated. Through the use in different climatic conditions,
fitting positions, aging or contamination (
→ 29) and after exchanging the sensor
( → 51) a shifting of the characteristic curve can occur and readjustment can be-
come necessary. Only the Pirani part can be adjusted.
At the push of a button the digital value and thus the analog output are adjusted
electronically to 10 V at atmospheric pressure.
Adjustment is necessary if
• at atmospheric pressure, the output signal is <10 V
• the display reads < atmospheric pressure (if the gauge has a display)
• at atmosphere, the digital value of the RS232C interface is < atmospheric pres-
sure
• at atmosphere, the digital value received by the bus controller of the fieldbus
gauges (DeviceNet, Profibus or RS485) is < atmospheric pressure
• when the vacuum system is vented, the output voltage reaches 10 V (limited to
10 V by the software) before the measured pressure has reached atmosphere
(gauges with display will show the error "5" at atmospheric pressure (Pirani
sensor warning
→ 30))
• when the vacuum system is vented, the digital value of the RS232C interface
reaches its maximum before the measured pressure has reached atmosphere
• when the vacuum system is vented, the digital value received by the bus con-
troller of the fieldbus (DeviceNet, Profibus or RS485) reaches its maximum be-
fore the measured pressure has reached atmosphere.
6.1 Maintenance
6.1.1 Cleaning the Gauge
6.2 Adjusting the Gauge
6.2.1 Adjustment at
Atmospheric Pressure