Zero Calibration; Operating Instructions; Alarm Setting Procedure; Low Alarm Setting - Maxtec MaxO2 ME+p Instructions For Use Manual

Pressure Effect
Readings from the MaxO ME+p monitor are proportional to the partial pressure of oxygen.
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The partial pressure of Oxygen (PO2) is equal to the percentage of oxygen (%O2) times the
absolute pressure (AP) at which the sample environment is measured (PO2=%O2 x AP).
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 ME+p monitor at the same pressure as the sample gas.
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2. If sample gases flow through tubing, use the same apparatus and flow rates when
calibrating as when measuring.
Humidity Effect
The MaxO ME+p monitor can be used in applications where the relative humidity of the sam-
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ple 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 ven-
tilator, 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 flow-
ing onto the sensing surface.
2.3.5 Zero Calibration
A zero calibration resets the zero point of the pressure sensor, the measurement when no
pressure is connected. Perform a zero calibration if the monitor displays a non-zero pressure
reading when no pressure is connected.
To zero the device:
1. Ensure no pressure is connected to the device and open to room air.
2. Unlock the device by pressing the unlock key
3. Select pressure mode by pressing the power/mode button until
display.
4. Press the CAL/0 button. The display will flash '0.0' until the zeroing has been
completed.
5. Verify the pressure display reads 0.0 cmH
3.0 OPERATING INSTRUCTIONS
3.1 Alarm Setting Procedure
3.1.1 Low Alarm Setting
To adjust the low alarm setting:
1. Press the Unlock key to unlock the keypad. Note the LOW, Smart Alarm, CAL and
HIGH icons will begin to flash indicating the SET OPERATING MODE.
Select oxygen or pressure by pressing the power/mode key
2. Press the DOWN (LOW ALARM) key
NOTE: The Low Alarm digits begin to flash indicating the Low Alarm manual setting.
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is shown on the
O once zeroing is complete.
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.
on the keypad.
3. Use the UP and DOWN
Pressing the arrow keys changes the value in 1% or 1 cmH
held down for more than 1 second the display will scroll at a rate of 1% or 1 cmH
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.
There is a special condition that allows the low oxygen alarm to be set below 18%. To access
this condition press the DOWN arrow
displays 18%. The alarm setting can now be adjusted to 17, 16, or 15%. A bar will blink above the
setting to provide further indication that the alarm has been set to this special <18% condition.
The low alarm value cannot be set lower than 15%, nor can it be set closer than 1% from the
high alarm value. For example, if the high alarm is set at 25%, the system will not accept a low
alarm setting greater than 24%.
4. When the low alarm value is set, press the Unlock key
setting and return to normal operation.
NOTE: The default low alarm setting is 18% O2 and off (––) for pressure. Removing the batter-
ies or shutting the unit OFF will reset the low alarm limit to 18% if it is set to <18%.
3.1.2 High Alarm Setting
To adjust the high alarm setting:
1. Press the Unlock key to unlock the keypad. Note the LOW, SMART ALARM, CAL and
HIGH icons will begin to flash indicating the SET OPERATING MODE.
Select oxygen or pressure by pressing the power/mode key
2. Press the UP (HIGH ALARM)
NOTE: The High Alarm digits begin to flash indicating the High Alarm manual setting.
3. Use the UP and DOWN
Pressing the arrow keys changes the value in 1% or 1 cmH
held down for more than 1 second the display will scroll at a rate of 1% or 1 cmH
second.
NOTE: If 30 seconds elapse between key actuations, the system will store the latest high alarm
setting and will revert to normal operation. If this occurs inadvertently, simply repeat the

alarm setting procedure.

When the high alarm setting is set above 100% or 60 cmH
dashes - -. This special condition turns off or deactivates the high alarm.
4. When the high alarm value is set, press the Unlock key
alarm setting and return to normal operation.
NOTE: The default high alarm setting is 50% oxgyen and 15 cmH
batteries will reset the high alarm limits to 50% and 15 cmH
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keys to set the low alarm to the desired value.
O increments. If the keys are
2
key for three seconds while the low alarm reading
to accept the low alarm
.
key on the key pad.
keys to set the high alarm to the desired value.
O increments. If the keys are
2
O the high alarm will indicate two
2
again to accept the high
O pressure. Removing the
2
O.
2
O per
2
O per
2
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