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When batteries are installed in the MaxO
2
ME, the unit initiates a self diagnostic
test. All segments of the LCD readout are turned on for approximately 2
seconds. The audio buzzer sounds and the high and low alarm LEDs are
illuminated. When the diagnostic test is completed successfully, the word "CAL"
will display and then automatically initiate a calibration.
2.2 Calibrating the MAXO
2
ME
Monitor
2.2.1 Before You Begin
A protective film covering the threaded sensor face must be removed; wait
approximately 20 minutes for the sensor to reach equilibrium.
Next, the MaxO
2
ME Oxygen Monitor should be calibrated. Thereafter, Maxtec
recommends calibration on a weekly basis. However, more frequent calibration
will not adversely affect product performance.
Calibration of the instrument should be performed when the temperature of
the gas stream changes by more than 3 degrees Celsius.
Changes in barometric pressure can affect the oxygen reading. A 1% change
in the barometric pressure results in an error of 1% of actual reading (Example:
If you are reading a 50% oxygen mix and the barometric pressure drops from
1000mbar to 990mbar the reading will drop to: 50% x (990/1000) = 49.5%).
Maxtec recommends that you re-calibrate after changing point-of-use elevation
by more than 500 feet (150m).
In addition, calibration is recommended if the user is unsure when the last calibration
procedure was performed or if the measurement value displayed is in question.
It is best to calibrate the MaxO
2
ME Monitor at a pressure and flow similar to
your clinical application.
NOTE: Before beginning calibration the MAX-550E sensor must be in thermal equilibrium. You
may also need to be aware of other factors which affect device calibration values. For more
information, refer to “Factors Influencing Calibration and Performance” in this manual. The
main display is capable of reading oxygen in the range of 0-105%. This additional range beyond
physically possible concentration is to allow the user to be able to see if the device is reading
accurately by testing in room air or 100% oxygen.
2.3 Set Operating Mode
2.3.2 To Calibrate the MaxO
2
ME Monitor to 20.9% Oxygen
1. Ensure the sensor is in room air and has had sufficient time to equilibrate
with room temperature.
2. Using the ON/OFF key , make sure the unit is powered on.
3. Allow the oxygen reading to stabilize. This will normally take about 30
seconds or more.
4. Press the Un-lock key to unlock the keypad. Note the LOW, Smart Alarm,
CAL, and HIGH icons will begin to flash indicating the SET OPERATING MODE.
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