INFICON PEG100 Medium to Ultra-High Vacuum Gauge - Manual (Page 15)

out, so that the accuracy of the measurements in the
range below 1·10
-6 mbar is improved.
Note
When using the PEG100 chiefly in the UHV range
(< 10
-8 mbar) it is recommended to remove the cathode
plate. This helps to the reduce the surface area of the
surfaces which may release gas.
How to proceed in order to detach the electronics as-
sembly is described in Section 3.3 (cleaning of the sen-
sor).
Permissible bake out temperatures:
Sensing cell of the PEG100, DN 25 KF:
200
°
C
(with ultra sealing disc)
Sensing cell of the PEG100, DN 40 CF: 350
°
C
2.4 Troubleshooting
No LED is on.
Possible cause: Supply voltage is missing.
The „POWER“ LED (4/1) is on, the „READY“ LED
(4/2) is not on.
Possible cause:
• High tension has not been activated.
• Pressure has dropped below 3·10 -9 mbar.
• The gas discharge has not ignited.
• Sensing cell not properly connected to the
electronics assembly (e.g. after maintenance).
• Missing anode ring (e.g. after maintenance).
The measurement signal is always greater than 10 V
even if the pressure is much lower than 10
-2 mbar.
Possible cause: Short circuit in the sensing cell.
Remedy: Clean the sensing cell. For this refer
to Section 3.3.
During pumpdown the measurement signal remains
at some level although the pressure is dropping.
Possible cause:
Contamination within the
sensing cell.
Remedy: Replace the sensing cell.
15
tina14e1 (0106) PEG100.ga
out, so that the accuracy of the measurements in the
range below 1·10
-6 mbar is improved.
Note
When using the PEG100 chiefly in the UHV range
(< 10
-8 mbar) it is recommended to remove the cathode
plate. This helps to the reduce the surface area of the
surfaces which may release gas.
How to proceed in order to detach the electronics as-
sembly is described in Section 3.3 (cleaning of the sen-
sor).
Permissible bake out temperatures:
Sensing cell of the PEG100, DN 25 KF:
200
°
C
(with ultra sealing disc)
Sensing cell of the PEG100, DN 40 CF: 350
°
C
2.4 Troubleshooting
No LED is on.
Possible cause: Supply voltage is missing.
The „POWER“ LED (4/1) is on, the „READY“ LED
(4/2) is not on.
Possible cause:
• High tension has not been activated.
• Pressure has dropped below 3·10 -9 mbar.
• The gas discharge has not ignited.
• Sensing cell not properly connected to the
electronics assembly (e.g. after maintenance).
• Missing anode ring (e.g. after maintenance).
The measurement signal is always greater than 10 V
even if the pressure is much lower than 10
-2 mbar.
Possible cause: Short circuit in the sensing cell.
Remedy: Clean the sensing cell. For this refer
to Section 3.3.
During pumpdown the measurement signal remains
at some level although the pressure is dropping.
Possible cause:
Contamination within the
sensing cell.
Remedy: Replace the sensing cell.
15
tina14e1 (0106) PEG100.ga