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ONE O2 OXYGEN MONITOR ALARM UNITS Page 12 of 21.
then be admitted to the sensor filter (ideally at a flow rate of 0.5 litres per minute). The
`Low Oxygen’ and `Critically Low’ Oxygen’ red LEDs should both flash and the audible alarm
bleep within 30 seconds.
When fresh air is admitted again to the sensor filter, the alarm indications should cancel
within 60 seconds.
5.4 CALIBRATION HIGH / CRITICALLY HIGH
To perform a sensor calibration undertake the sensor optimisation procedure outlined
above. When successfully completed a test gas of 23.5% oxygen (balance nitrogen) should
then be admitted to the sensor filter (ideally at a flow rate of 0.5 litres per minute). The
`High Oxygen’ and `Critically High’ Oxygen’ red LEDs should both flash and the audible
alarm bleep within 30 seconds.
When fresh air is admitted again to the sensor filter, the alarm indications should cancel
within 60 seconds.
5.5 CALIBRATION HIGH / LOW
To perform a sensor calibration undertake the sensor optimisation procedure outlined
above. When successfully completed a test gas of 18.0% oxygen (balance nitrogen) should
then be admitted to the sensor filter (ideally at a flow rate of 0.5 litres per minute). The
`Low Oxygen’ red LED should both flash and the audible alarm bleep within 30 seconds.
A test gas of 23.5% oxygen (balance nitrogen) should then be admitted to the sensor filter
(ideally at a flow rate of 0.5 litres per minute). The `High Oxygen’ and ` red LED should both
flash and the audible alarm bleep within 30 seconds.
When fresh air is admitted again to the sensor filter, the alarm indications should cancel
within 60 seconds.
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