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Page 29
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Operation
D397-21-880 Issue G
Figure 22 - Gauge setup screen WRG
Note:
If the Pirani sensor is replaced (see WRG instruction manual D147-01-885) it may initially fail to indicate
pressures less than 1 x 10
-3
mbar (7.5 x 10
-4
Torr). In this case a manual vacuum calibration is required.
Pump down to 1 x 10
-5
mbar (7.5 x 10
-6
Torr) or below before performing the CAL operation as described in
the instruction manual.
WRG has an in-built error monitoring capability. (Refer to
).
Table 20 - Setup options WRG
Menu option
Description
Calibrate
Allows the user to perform the atmosphere and vacuum adjustment on the WRG.
Connect the WRG to TIC and allow it to operate at atmospheric pressure for at
least 10 minutes.
'Scroll' to 'Calibrate' and press 'Select'.
'Command Sent' appears for 1s to confirm instruction has been carried out.
The WRG will automatically perform a Pirani sensor vacuum setting every time it is
pumped down below 1 x 10
-4
mbar (7.5 x 10
-5
Torr).
Table 21 - Error/diagnostic monitoring WRG
Diagnostic messages
Description
Over Range
(Gauge output
>
10.600 V)
Indicates that there is a fault with the gauge and it should be replaced.
Not Struck
(Gauge output
=
1.300 V)
Indicates that the magnetron part of the gauge has not struck.
The gauge tube should be inspected for signs of contamination or debris. If the
anode and cathode are not bright, the gauge should be cleaned as described in the
WRG instruction manual.
Striker Fail
(Gauge output
=
1.200 V)
Indicates that the striker filament has broken.
The electrode assembly (D147-01-802) should be replaced as described in the WRG
instruction manual.
Mag Fail
(Gauge output
=
1.100 V)
Indicates that the magnetron part of the WRG has shorted out. This could be
because of contamination or a foreign body. The WRG should be cleaned as
described in the instruction manual.
If this fails to rectify the fault, the WRG should be serviced and the electrode
assembly (D147-01-802) replaced as described in the instruction manual.
Filament Fail
(Gauge output
=
1.000 V)
Indicates that the Pirani element of the gauge has failed. The most likely fault
being a broken filament. The WRG should be serviced as described in the
instruction manual.