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Infrared Gas Analyzer Maintenance
Teledyne Analytical Instruments 103
operation should be performed by a trained technician or
the unit sent back to the factory for service.
Perform an adjustment if excessively (beyond ±2% FS) affected by
moisture inteference.
It is also necessary to adjust moisture interference compensation
after making an optical balance adjustment or whenever the cell
structure is opened to moist air.
1.
After warm-up, select the low range and allow dry gas
(N
2
or air) to flow at 0.5 L/min and zero calibrate the
analyzer.
2.
Display the moisture interference compensation screen of
the analyzer unit (see Section 3.6.5 Moisture Interference
Adjustment). Set the dew point to 2°C by using an
electronic cooler, and introduce bubbled N
2
or air to the
analyzer (shown in the Figure 4-10).
Figure 4-10: Bubbler Apparatus
3.
On the screen, select a desired channel by using the UP
and DOWN keys then pressing ENT when the cursor is
on the desired channel.
4.
Use the SIDE key to move the cursor to the numerical
value in the right column. Adjust the value by the UP or
DOWN key so that the value at left falls within ±10 (or as