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VS Series Helium Mass Spectrometer Leak Detectors
3.1.7 Gauge Calibration
❑
Press Gauge Calibration on the Set-Up screen and the Gauge Calibration screen
appears (Figure 3-13).
Use this screen to perform a calibration on the test port thermocouple gauge.
Calibrate the thermocouple gauge for the most accurate operation. To calibrate the gauge:
1. Set a calibration point at atmosphere.
2. Set a calibration point at a low vacuum level (<= 1E-4 Torr).
Press to activate the
calibration type.
Display only.
Test Port Vacuum
Test Port ATM
Test Port Pressure and
Spectrometer Pressure
Test Port Pressure
Gauge Calibration
Procedure
0
1
2
3
4
GAUGE CALIBRATION
TEST PORT VACUUM
TEST PORT ATM
TEST PORT PRESSURE:
SPECTROMETER PRESSURE:
Figure 3-13 Gauge Calibration
Calibrates the thermocouple gauge zero value. Do this at or below
1E-4 Torr.
Sets the thermocouple atmospheric value. Perform this operation
only when the test port is at atmosphere.
The Test Port Pressure and the Spectrometer Pressure values appear
on this screen for reference.
Calibrates the test port pressure thermocouple gauge. Perform both
the Vacuum and Atmospheric Calibration procedures in the order
written, TEST PORT VACUUM and the TEST PORT ATM.
Display of <1.0E-03 indicates the pressure is less than the
NOTE
lowest displayable pressure of the TC gauge which is 1.0E-03.
5
6
7
8
9
CAL OK
CAL FAILED
<1.0E-03 TORR
. 1.0E-06 TORR
10
-
10
CAL OK indicates
valid calibrations.
CAL FAILED
indicates a failed
cal.
Changes during
the procedure.
DONE
3-17
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