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866.4.Maxtec www.maxtec.com
2.5.3 Inlet Filter
» Air Safety Ltd. Cat.No. RP34P02
3.0 FACTORS INFLUENCING ACCURATE READINGS
3.1 Elevation/Pressure Changes
» Changes in elevation result in a reading error of approximately 1% of reading per 250 feet.
» A change in altitude greater than 500 ft will require sensor recalibration.
» This device does not automatically compensate for changes in barometric pressure
or altitude. If the device is moved to a location of a different altitude, it must be
recalibrated before use (see section 2.2).
3.2 Temperature Effects
The MaxVenturi will read correctly (within ±3%) when operating at thermal
equilibrium within the operating temperature range of 15 °C - 40 °C
(59 °F - 104 °F). The device must be thermally stable when calibrated and
allowed to thermally stabilize after experiencing temperature changes before
readings are accurate. For these reasons it is recommended to:
» Perform the calibration procedure at a temperature close to the temperature at which the
device will be operated.
» Allow adequate time for the sensor to equilibrate to a new ambient temperature.
ATTENTION:
“CAL Err St” may result from a sensor that has not reached thermal equilibrium.
4.0 CALIBRATION ERRORS AND ERROR CODES
The analyzer has a self test feature built into the software to detect faulty
calibrations, oxygen sensor failures, and low battery voltage. The tests and
actions to take if an error occurs are:
E02: NO SENSOR ATTACHED
» 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.
E03: NO VALID CALIBRATION DATA AVAILABLE
» Make sure unit has reached thermal equilibrium.
» Perform calibration as described in this manual.
E04: BATTERY BELOW MINIMUM OPERATING VOLTAGE
» Replace batteries.
CAL Err St: O
2
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.
NOTE:
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
» Repeat calibration routine as described in this manual. If unit repeats this error more
than three (3) times, contact Maxtec Customer Service.
