9.9. Technical Specification for Oxygen Monitoring
The O2 monitor monitors and displays the O2 concentration in the
animal circuit. The O2 sensor assembly contains an oxygen sensor
that generates a voltage on its sensing surface commensurate with
the partial pressure (concentration) of oxygen.
The O2 sensor is an electrochemical device (chemical cell). Oxygen
diffuses into the device through a membrane, oxidizing the base metal
electrode. This oxidation process generates a current that is
commensurate with the partial pressure of oxygen indicated by
electrode sensing. The base metal electrode is gradually depleted
during the oxidation process.
The voltage of the sensor is affected by the temperature of the
monitored gas mixture. The sensor's surgical thermistor automatically
compensates for temperature changes within the sensor.
O2 monitors use signal processing and analysis circuitry to convert
sensor signals into corresponding oxygen percentage values. The
system displays this value and compares it with the saved alarm limit
value. If the value exceeds the limit value, the monitor will issue an
alarm.
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