45
Appendix A
Field Calibration (Optional)
This feature allows simple calibration to be used in the fi 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 fi eld calibration:
• Calibration test gases
• Demand fl ow regulator
• Sample tubing
To perform fi eld calibration, follow this process:
1.
During instrument warm-up the information display
will have fi eld calibration (FC) fl ashing in the bottom
left hand corner (if enabled).
Press
B4
to select fi eld calibration.
2. After instrument warm-up, if prompted, enter the
fi eld calibration code. The default code is
4343
(
B4
,
B3
,
B4
,
B3
).
i
The 4 digit fi 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).
