4.0 FACTORS INFLUENCING ACCURATE READINGS
4.1 Elevation Changes
• Changes in elevation result in a reading error of approximately 1% of
reading per 250 feet.
• In general, calibration of the instrument should be performed when elevation
at which the product is being used changes by more than 500 feet.
4.2 Temperature Effects
The MAXO
2
+
will hold calibration and read correctly within ±3% when in ther-
mal equilibrium within the operating temperature range. The device must be
thermally stable when calibrated and allowed to thermally stabilize after
experiencing temperature changes before readings are accurate. For these
reasons, the following is recommended:
• For best results, perform the calibration procedure at a temperature close to
the temperature where analysis will occur.
• Allow adequate time for the sensor to equilibrate to a new ambient temperature.
CAUTION: “CAL Err St” may result from a sensor that has not
reached thermal equilibrium.
4.3 Pressure Effects
Readings from the MAXO
2
+
are proportional to the partial pressure of oxy-
gen. The partial pressure is equal to the concentration times the absolute
pressure. Thus, the readings are proportional to the concentration if the
pressure is held constant. Therefore, the following are recommended:
• Calibrate the MAXO
2
+
at the same pressure as the sample gas.
• If sample gases flow through tubing, use the same apparatus and flow rates
when calibrating as when measuring.
• The MAXO
2
+
oxygen sensor has been tested at pressures up to two
atmospheres absolute. Calibration or operation above this pressure is
beyond the intended use.
4.4 Humidity Effects
Humidity (non-condensing) has no effect on the performance of the MAXO
2
+
8
MANUFACTURED BY MAXTEC
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