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Page 25
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Operation
D397-01-880 Issue E
Note:
There is a +/- 50 mV tolerance on the gauge outputs shown in
4.8.5
Active Thermocouple Gauge (ATC-E) control
Note:
For a detailed specification and instructions regarding the use of the ATC-E, refer to the instruction manual
(D351-08-880).
Active Thermocouple Gauges are low-cost, gas-dependent, high-pressure thermal conductivity gauges. The ATC-E
electronics module is compatible with two types of thermocouple gauge tube to give a wide measuring range. (Refer
to
).
Before connecting to TIC, the ATC-E must be configured for the type of gauge tube (ATC-D or ATC-M) to be used. This
is done by selecting the body colour of the tube with the two-position switch.
Note:
For a valid pressure readout, the switch must be correctly set on the ATC-E.
Note:
At pressures above 600 mbar, ATC-D sensitivity is reduced and TIC displays atmospheric pressure.
The ATC-M does not display pressures above 4.2 mbar.
There are no additional setup options for ATC-E. (Refer to Default setup options (all gauges)
Please refer to
for the error and diagnostic information for the ATC-E gauge.
Table 15 - Error/diagnostic monitoring APGX
Diagnostic messages
Description
Over Range
(Gauge output = 9.750 V)
Indicates that there is a fault with the gauge and it should be replaced.
Under Range
(Gauge output <0.300 V)
Indicates that there is a fault with the gauge and it should be replaced.
Filament Fail
(Gauge output = 9.500 V)
Indicates that the gauge filament is broken.
The gauge should be replaced.
Cal Error
(Gauge output = 9.600 V)
Indicates that the gauge has gone out of calibration.
This could be because of the wrong gas type being selected, pressing the
atmosphere and vacuum adjustment button in mid-range or contamination of
the gauge.
The gauge should be re-adjusted as described in
.
If the fault persists the gauge should be replaced.
No Tube
(Gauge output = 9.700 V)
Indicates that the replaceable gauge tube is missing or incorrectly fitted.
Check the tube and ensure that the two fixing screws are properly secured.
Note:
APGX-H only.
Table 16 - ATC-D and ATC-M gauge tubes
Tube name
Tube part number
Pressure measuring range
ATC-D
D355-12-000
65 to 6.5 x 10
-2
mbar (50 to 5 x 10
-2
Torr)
ATC-M
D355-13-000
1.3 to 1.3 x 10
-3
mbar (1 to 1 x 10
-3
Torr)
