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5 MAINTENANCE
Other than the Sensor-Battery Pack there are no operator serviceable or replaceable parts. It
is important that the weekly, monthly and annual checks described below are followed, in
order to ensure that the monitor offers appropriate protection to the user for the life of the
sensor/battery pack. Failure to do so may lead to false alarms.
Please remember SAFETY if you suspect your ONE O2 is malfunctioning. DO NOT ENTER ANY
AREA UNLESS GAS CONCENTRATION IS KNOWN AND AT A SAFE LEVEL.
5.1 TESTING
The ONE O2 system should be tested for functionality on a monthly basis. If the ONE O2
system fails a properly constituted functionality test, it should be withdrawn from service
immediately. We recommend keeping a log of this test and recommend that it should be
undertaken as part of routine fire alarm tests in order that staff should recognise the alarm
and understand the evacuation procedure.
A functionality test involves admitting test gas having an oxygen concentration marginally
past the alarm threshold(s) to the sensor and checking that both the appropriate red LEDs
flash and that the audible alarm bleeps. Please refer to the appropriate model table in the
operation section of this manual for expected unit behaviour. The alarms should activate
within 30 seconds.
Calibrated test gas kits are available to purchase from Quantum Cryogenics.
The ONE O2 monitor should return to the normal (non-alarm) state within 60 seconds of
fresh air being readmitted to the sensor.
The ONE O2 monitor should be recalibrated at intervals of no longer than twelve months
and the sensor optimised every month.
5.2 SENSOR OPTIMISATION
This applies to all models of ONE O2.
First, fresh dry air (or test gas with a concentration of 20.8% oxygen in balance of nitrogen)
should be admitted to the sensor filter of the monitor for at least 60 seconds.
IMPORTANT NOTE: The oxygen concentration in enclosed areas and rooms within buildings
may vary significantly from 20.8% O2 due to on-going gas release and / or poor ventilation.
In these circumstances the monitor should optimised using 20.8% O2 calibration test gas.
Whilst still exposed to this gas, a fine blade instrument screwdriver (or trimtool) should be
used to adjust the brass coloured adjustment screw (20 turn potentiometer) which is located
on the top of the monitor. The adjustment screw should be adjusted until the Cal High and
Cal Low LED's are illuminated when the green cal button is pressed on the top of the unit.
5.3 CALIBRATION LOW / CRITICALLY 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
ONE O2 OXYGEN MONITOR ALARM UNITS
Page 11 of 21.
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