Procedure
1. Disconnect any external tubing connected to the rear ports of the instrument (Sample Port,
Exhaust Port, etc.).
2. Open - Main Menu → Calibration Menu → Flow Calibration Menu.
3. Select - Pump Control → MANUAL - Accept.
4. Off - Internal Pump → Off.
5. Wait for the Sample Flow to become stable around 0 (± 0.01 slpm).
6. Set - Cal. Zero - Yes (Calibration of your zero point).
7. Connect a calibrated flow meter to the Sample Port.
8. On - Internal Pump → On.
9. Manually adjust the Coarse and Fine pots until the flow meter reads the desired instrument
Sample Flow rate (Flow Set Point).
Note: Adjust the Fine pot to 253, adjust the Coarse to be as close as possible to desired reading
and use Fine pot to make it exact.
10. Edit - Cal. Point - (Enter the reading from the flow meter) - Accept.
11. Select - Pump Control → START - Accept.
12. Leave for up to five minutes to return to normal operation. If instrument doesn’t return to normal
there may be a blockage (refer to Section 7).
13. Remove flow meter and reconnect external tubbing.
5.9 High Pressure Zero Valve (Option)
If the instrument was ordered with this option, the internal pressurised calibration valves will already
be installed within the instrument as a zero calibration source, thus no other internal connections need
to be made.
Note: Before using a high pressure zero as a source calibrating the instrument, check the local
regulatory requirements. This is generally only be used as an operational check of the instrument’s
zero point.
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