5.2.2 Pressure Calibration (Ambient Only)
Full pressure calibrations are generally recommended, however it is possible to calibrate only the
ambient point in cases where only a minor ambient pressure adjustment is required.
Note: Ensure that the instrument has been running for at least one hour before any calibration is
performed to ensure the instrument’s stability.
Note: Ensure units of measure are the same on both the barometer and instrument.
Equipment Required
• Barometer
Procedure
1. Turn OFF the vacuum source and allow the instrument to return to ambient pressure.
2. Refer to Figure 114. Disconnect any external tubing connected to the rear of the instrument.
3. Open - Main Menu → Calibration Menu → Pressure Calibration Menu - (read note) - OK.
Note: This action will place the valve sequence on hold; normal sampling will be interrupted.
4. Edit - Ambient Set Pt. - (Read displayed instructions) - OK.
Figure 114 – Ambient Pressure Calibration Set-up
5. Wait 2 - 5 minutes and enter the ambient barometer reading into the instrument - Accept.
Note: Both cell and ambient pressure sensors should now be displaying the current ambient
pressure and they should be the same value within 3 torr of each other.
6. Back - Pressure Calibration Menu - (read note) - OK.
5.2.3 Pressure Calibration (Internal Pump Option Only)
The internal pump requires a separate pressure calibration procedure that replaces the one used in
Section 5.2.1 and 5.2.2.
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