INFICON PEG100 Medium to Ultra-High Vacuum Gauge - Manual (Page 14)

No LED on.
- Supply voltage is missing.
→
Measurement signal: 0 V
Only the orange LED (4/1) is on.
- The supply voltage is present.
- The high tension has not been switched on.
→
Measurement signal: 0 V
The green LED (4/2) is on, the orange LED (4/1) is on.
- The supply voltage is present.
- The high tension has been switched on.
- The gas discharge has been started.
- The pressure is over 3·10
-9 mbar.
→
Measurement signal: > 0.66 V
2.3.2 Measurement System Status Indication
In the case of the Penning method of measurement one
only may draw conclusions as to proper functioning
while the PEG100 is in the measurement mode, i.e.
when the gas discharge is running.
Trouble-free operation („READY“ LED (4/2) is on, status
output HIGH) is marked by the presence of a pressure
dependant signal starting at a pressure of about 3·10
-9
mbar up to the range limit of 1·10 -2 mbar. When the pres-
sure drops < 3·10 -9 mbar this status is also maintained.
When the “READY” LED (4/2) is not on, status output 0
V:
Cause 1: When the high voltage was switcthed on the
pressure was below 3·10 -9 mbar.
Cause 2: No ignition of the gas discharge, even if the
power supply voltage is present, the high ten-
sion has been switched on and a pressure
between about 3·10
-9 mbar and 1·10 -2 mbar.
2.3.3 Degassing
Caution Before baking out the sensing cell you
must detach the electronics assembly
from the sensing cell. The electronics
assembly may be damaged when ex-
ceeding a temperature of 70
°
C.
Caution Before baking out, you must make sure
that an ultra sealing disc (PEG100, DN
25 KF) or a copper seal (PEG100, DN
40 CF) is used as the flange seal.
The PEG100 are equipped with all-metal sensing cells
so that any outgassing caused by polymer seals is enti-
rely avoided.
After having detached the electronics (refer to Sec-
tion 3.3.1) from the sensing cell, the outgassing rate of
the sensing cell may be reduced considerably by baking
14
tina14e1 (0106) PEG100.ga
No LED on.
- Supply voltage is missing.
→
Measurement signal: 0 V
Only the orange LED (4/1) is on.
- The supply voltage is present.
- The high tension has not been switched on.
→
Measurement signal: 0 V
The green LED (4/2) is on, the orange LED (4/1) is on.
- The supply voltage is present.
- The high tension has been switched on.
- The gas discharge has been started.
- The pressure is over 3·10
-9 mbar.
→
Measurement signal: > 0.66 V
2.3.2 Measurement System Status Indication
In the case of the Penning method of measurement one
only may draw conclusions as to proper functioning
while the PEG100 is in the measurement mode, i.e.
when the gas discharge is running.
Trouble-free operation („READY“ LED (4/2) is on, status
output HIGH) is marked by the presence of a pressure
dependant signal starting at a pressure of about 3·10
-9
mbar up to the range limit of 1·10 -2 mbar. When the pres-
sure drops < 3·10 -9 mbar this status is also maintained.
14
tina14e1 (0106) PEG100.ga
When the “READY” LED (4/2) is not on, status output 0
V:
Cause 1: When the high voltage was switcthed on the
pressure was below 3·10 -9 mbar.
Cause 2: No ignition of the gas discharge, even if the
power supply voltage is present, the high ten-
sion has been switched on and a pressure
between about 3·10
-9 mbar and 1·10 -2 mbar.
2.3.3 Degassing
Caution Before baking out the sensing cell you
must detach the electronics assembly
from the sensing cell. The electronics
assembly may be damaged when ex-
ceeding a temperature of 70
°
C.
Caution Before baking out, you must make sure
that an ultra sealing disc (PEG100, DN
25 KF) or a copper seal (PEG100, DN
40 CF) is used as the flange seal.
The PEG100 are equipped with all-metal sensing cells
so that any outgassing caused by polymer seals is enti-
rely avoided.
After having detached the electronics (refer to Sec-
tion 3.3.1) from the sensing cell, the outgassing rate of
the sensing cell may be reduced considerably by baking