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Page 23
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Operation
D397-01-880 Issue E
4.8.2
Gauge status messages
Standard status messages are shown in
4.8.3
Active Pirani Gauge (APG)
Note:
For a detailed specification and instructions regarding the use of the APG and APGX gauges refer to the
appropriate Instruction Manual (D021-71-885, D023-71-880 and D023-91-880).
The Active Pirani Gauge (APG) is a gas-dependent, high-pressure thermal conductivity gauge. The measuring range
of the APG-M and the corrosion resistant APG-MP is 100 mbar to 10
-3
mbar (75 to 7.5 x 10
-4
Torr); the range of the
APG-L is 10 mbar to 10
-4
mbar (7.5 to 7.5 x 10
-5
Torr). All of the gauges will indicate pressure up to 1000 mbar
(750 Torr) at reduced accuracy.
Note:
At pressures above 600 mbar, sensitivity is reduced and TIC displays atmospheric pressure.
Note:
Before the APG is used and periodically thereafter, atmosphere and vacuum calibration should be carried
out in accordance with the directions shown in the Instruction Manual (D021-71-885, D023-71-880 and D023-
91-880).
The APG is set up as per the default gauge setup instructions shown in
above.
There are no additional setup options for APG. (Refer to Default setup options (all gauges)
.
There are no error/diagnostic messages specific to APG. (Refer to
Table 12 - Gauge status messages
Diagnostic messages
Description
Not Connected
Indicates that no gauge has been connected to TIC, or if a cable has been
connected, the gauge may not be connected to the other end.
Disconnected
The gauge connection has been removed intentionally or accidentally.
New ID
Indicates that a new gauge has been connected to TIC. The gauge is recognised
by TIC, but must be acknowledged by the user before TIC will allow the gauge
to operate on the system.
Uknw
Indicates that the connected gauge is not recognised by TIC. In this case, TIC
will continue to display the gauge as Uknw and will give an output in volts only.
Table 13 - Error/diagnostic monitoring APG
Diagnostic messages
Description
Over Range
(Gauge output >11.000 V)
Indicates that either the measured gas pressure is outside the range of the
gauge, or that there is a fault with the gauge.
Clear the error message, reduce the process pressure to within the range of the
gauge, 'Scroll' to the gauge display line and press 'Cycle'. If the gauge fails to
give a pressure readout it should be replaced.
This is most likely to occur with gases of low molecular weight such as Helium.
Under Range
(Gauge output <1.800 V)
Indicates that there is either a calibration error, or the gauge is faulty.
Calibrate the gauge as described in the instruction manual. If the fault persists,
replace the gauge.
Содержание D397-01-000
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