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Appendix A
Field Calibration (Optional)
This feature allows simple calibration to be used in the eld, without the use of the automatic and
manual calibration set-ups previously highlighted in this User Guide.
The following kit is required to perform eld calibration:
• Calibration test gases
• Demand ow regulator
• Sample tubing
To perform eld calibration, follow this process:
1. During instrument warm-up the information display
will have eld calibration (FC) ashing in the bottom
left hand corner (if enabled).
Press
B4 to select eld calibration.
2. After instrument warm-up, if prompted, enter the
eld calibration code. The default code is 4343 (
B4,
B3, B4, B3).
i
The 4 digit eld calibration code can be selected
during instrument procurement.
3. Apply clean air to the instrument, then zero, by
pressing
B1.
4. Make sure the gas range selected is compatible with
the calibration gas.
The range can be changed by pressing
B2.
5. Remove the cap from the calibration gas cylinder.
Connect the ‘Demand Flow Regulator’ to the gas
cylinder (push down gently and tighten clockwise,
hand tight).
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