Part No. 715-0080, Rev. B
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SECTION 5: OXYGEN MONITOR (OPTIONAL FEATURE)
OXYGEN MONITOR PRINCIPLES OF OPERATION
The oxygen monitor is intended to be used to measure and display the oxygen concentration as a
volume fraction percentage (%) in an area to which a Maxtec MAX-250E oxygen sensor is exposed.
The readings are proportional to the partial pressure of oxygen (PO
2
), which is equal to the percentage
of oxygen times the absolute pressure of the environment being measured. The oxygen monitor can
be influenced by the following:
Temperature
In order for oxygen readings to be accurate, the oxygen monitor must be thermally stable when
calibrated and when measurements are taken. If temperature conditions change, adequate time must
be allowed for the sensor to stabilize and give accurate readings. For best results, calibrate the
oxygen monitor at the same temperature at which the monitor will be used.
Pressure
The readings from the oxygen monitor are proportional to the oxygen concentration only if pressure is
held constant. The oxygen monitor does not compensate for changes in barometric pressure.
Because the flow rate of the gas being sampled can affect the pressure at the sensor in that the back
pressure may change, the oxygen monitor should be calibrated at the same pressure as the sample
gas. Changes in elevation result in calibration error of approximately 1% of reading per 250 feet. In
general, calibration of the instrument should be performed when the geographic elevation at which the
product is being used changes by more than 500 feet. The oxygen monitor should not be calibrated at
a pressure above 2 atmospheres as this is beyond the sensor’s intended use.
Humidity
Condensation due to high humidity can adversely affect the oxygen monitor. The sensor should be
calibrated and used in environments < 95% relative humidity and placed upstream of any humidifier (if
used in a breathing circuit) to reduce the risk of water condensation.
CAUTION:
Only use International Biomedical cable and Maxtec sensor for oxygen monitoring.
CAUTION:
Use the oxygen monitor when oxygen is delivered to the infant.
Summary of Contents for AirBORNE A750i
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