Figure 46 – Vacuum calibration, on-screen instructions
10. Disconnect the external vacuum, sample port blocker and the exhaust line tee blocker.
Ambient Point Calibration
Note: It is important to wait 3 to 5 minutes to allow the analyser to stabilise before performing the
ambient calibration.
Full pressure calibrations are generally recommended, however it is possible to adjust only the
ambient point in cases where only a minor ambient pressure adjustment is required.
1. Ensure that any vacuum source connected to the exhaust port of the analyser has been switched
off and disconnected. Also disconnect any tubing connected to the Sample Port.
2. Obtain the current ambient pressure with a pressure meter.
3. Enter the Main Menu Calibration Menu Pressure CalibrationAmbient Set pt. (If
continuing from the vacuum pressure calibration this step is not necessary).
4. Edit the Ambient Set pt. value using the keypad to input the current ambient pressure (ensure
you are using the same pressure units that are shown on screen).
Figure 47 – Setting the ambient set point
5. Edit the Ambient Set pt. value with the current ambient pressure. Ensure you are using the same
pressure units that are shown on screen.
6. Press the Accept button to calibrate pressure sensors.
Note: All three sensors should now be displaying the current ambient pressure.
7. Exit the Pressure Calibration Menu.
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