D397-01-880 Issue E
Page 24
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Operation
4.8.4
Active Linear Pirani Gauge (APGX)
The Active Linear Pirani Gauge (APGX) is a gas-dependent, high-pressure thermal conductivity gauge. The measuring
range of the APGX-M and the corrosion resistant APGX-MP is 100 mbar to 10
-3
mbar (75 to 7.5 x 10
-4
Torr); the range
of the APGX-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.
The Linear Convection Gauges (APGX-H) are gas-dependent, high pressure thermal conductivity and convection
gauges. The measuring range of the APGX-H is 1333 to 3 x 10
-4
mbar (1000 to 2.3 x 10
-4
Torr). At pressures above
10 mbar, pressure measurement is by convection, which provides consistent sensitivity and accuracy to the top of
the measuring range.
APG(X)s are permanently enabled and hence give an output as soon as they are recognised.
The APGX is set up as per the default gauge setup instructions shown in
APGX has menu options in addition to those shown. Refer to Default setup options (all gauges)
).
Figure 19 - Gauge setup screen APGX-M
APGX has an built-in error monitoring capability. (Refer to
).
Table 14 - Setup options APGX
Menu option
Description
Calibrate
Allows the user to adjust the APGX at atmosphere and vacuum.
Connect the APGX 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 1 s to confirm instruction has been carried out.
Reduce the system pressure to 1 x 10
-4
mbar (7.5 x 10
-5
Torr) or below for the
APGX-M or APGX-MP, or 1 x 10
-5
mbar
(7.5 x 10
-6
Torr) or below for the APGX-L and APGX-H.
Press ‘Select’. ‘Command Sent’ appears after 1 second to confirm instruction
has been carried out.
Press ‘menu’ (
) button to return to the display screen.
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