other than diluting the gas, as long as there is no condensation. Depending
on the humidity, the gas may be diluted by as much as 4%, which proportion-
ally reduces the oxygen concentration. The device responds to the actual
oxygen concentration rather than the dry concentration. Environments where
condensation may occur are to be avoided since moisture may obstruct
passage of gas to the sensing surface, resulting in erroneous readings and
slower response time. For this reason, the following is recommended:
• Avoid usage in environments greater than 95% relative humidity.
HELPFUL HINT: Dry sensor by lightly shaking moisture out, or flow a
dry gas at two liters per minute across the sensor membrane.
5.0 CALIBRATION ERRORS AND ERROR CODES
The MAXO
2
+
analyzers have a self test feature built into the software to
detect faulty calibrations, oxygen sensor failures, and low operating voltage.
These are listed below, and include possible actions to take, if an error code
occurs.
E02: No sensor attached
MAXO
2
+
A: Open unit and disconnect and reconnect sensor. Unit should
perform an auto calibration and should read 20.9%. If not, contact Maxtec
Customer Service for possible sensor replacement.
MAXO
2
+
AE: Disconnect and reconnect external sensor. Unit should perform
an auto calibration, and should read 20.9%. If not, contact Maxtec Customer
Service for possible sensor replacement or cable replacement.
E03: No valid calibration data available
Make sure unit has reached thermal equilibrium. Press and hold the
Calibration Button for three seconds to manually force a new calibration.
E04: Battery below minimum operating voltage
Replace batteries.
CAL Err St: O2 Sensor reading not stable
Wait for displayed oxygen reading to stabilize, when calibrating the device at
100% oxygen.
Wait for unit to reach thermal equilibrium (Please note that this can take up to
one half hour, if the device is stored in temperatures outside the specified
operating temperature range).
CAL Err lo: Sensor voltage too low
Press and hold the Calibration Button for three seconds to manually
force a new calibration. If unit repeats this error more than three times,
9
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