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MAINTENANCE
6.1 CALIBRATION
Although the OxyTrans comes Factory-calibrated, you may wish to recalibrate
the unit at some time. Calibration of the OxyTrans is very simple. A calibration
gas with a known Oxygen value is required.
CALIBRATION ADJUSTMENT SCREW
Figure 3
Figure 6-1 Calibration Adjustment
Notes:
1. Select a calibration gas that is equivalent to your measurement range.
For example, if you have the 0 to 100 ppm unit, select a gas with an
Oxygen value of approximately 40
– 50 ppm O
2
in N
2
.
2. Be sure that line pressure remains constant during the calibration.
3. If you have the 0 to 25% Oxygen range, air may be used for the
calibrating gas. Air consists of approximately 21% Oxygen.
4. Be sure to wait until complete equilibration before calibrating the unit.
If the Oxygen concentration is very low, or if the sampling system is
large, waiting a long time may be required.
