To use this function:
1)Place the external probe in room air.
2)Press the LOCK\UNLOCK key to unlock the keypad.
3)Press and hold down the CALIBRATE key. When the "%" sign starts to flash, press the ↓ arrow key to set the calibration value to 20.9%.
4)Release both the CALIBRATE key and the ↓ key.
The unit will automatically enter the “LOCKED” condition and return to normal operation.
2.2.4 Factors Influencing Calibration
The primary factors influencing the MAXO2 Monitor are temperature, pressure, and humidity.
Effects of Temperature
The MAXO2 Monitor will hold calibration and read correctly within ±3% when in thermal equilibrium within the operating temperature range. The device must be thermally stable when calibrated and allowed to thermally stabilize after experiencing temperature changes before reading are accurate. For these reasons, the following is recommended:
1)Allow adequate time for the sensor to equilibrate to a new ambient temperature.
2)When used in a breathing circuit, place the sensor upstream of the heater.
3)For best results, perform the calibration procedure at a temperature close to the temperature where analysis will occur.
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