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Thus the readings are proportional to the concentration if the pressure is
held constant. Flow rate of sample gas can affect pressure at the sensor in
that back pressure at the sensing point may change. For these reasons, the
following is recommended:
1. Calibrate the MaxO
2
ME Monitor at the same pressure as the sample gas.
2. If sample gases flow through tubing, use the same apparatus and flow rates
when calibrating as when measuring.
Humidity Effect
The MaxO
2
ME Monitor can be used in applications where the relative humidity
of the sample gas ranges from 0 to 95%, non-condensing. However, it should
be noted that water vapor exerts its own pressure in the same manner as
oxygen does in a sample gas stream.
For example, if the monitor is calibrated in dry gas and then the gas is
humidified, the monitor will correctly display a reading which is slightly lower
than previously displayed. This is due to the dilution of oxygen in the sample
gas by water vapor.
This fact is important to note in systems where there exist both “wet” and
“dry” gas streams such as in a ventilator circuit. If the monitor is measuring
oxygen on the “dry side” of the ventilator, it will correctly indicate an oxygen
concentration slightly greater than actually found in the “wet side” (delivered
to the patient). The water vapor has diluted the gas stream.
Additionally, gas streams of high humidity may tend to condense on the sensor.
Condensation on the sensor may eventually affect performance. For this reason,
it is recommended that the sensor be mounted in a vertical position, facing
downward to prevent condensate from flowing onto the sensing surface.
3.0 OPERATING INSTRUCTIONS
3.1 Alarm Setting Procedure
3.1.1 Low Alarm Setting
To adjust the low alarm setting:
1. 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.
2. Press the DOWN (LOW ALARM) key on the keypad.
NOTE: the Low Alarm digits begin to flash indicating the Low Alarm manual setting.
3. Use the UP and DOWN keys to set the low alarm to the desired value.
Pressing the arrow keys changes the value in 1% increments. If the keys are held
down for more than 1 second the display will scroll at a rate of 1% per second.
NOTE: If 30 seconds elapse between key actuations, the system will store the latest low
alarm value and will revert to normal operation. If this occurs inadvertently, simply repeat
the alarm setting procedure.
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