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ONE O2 OXYGEN MONITOR ALARM UNITS Page 8 of 21.
4 OPERATION
The ONE O2 monitor is powered by internal (non-rechargeable) batteries. It operates
continuously and has no ON / OFF switch.
If the Low Battery condition is observed the ONE O2 monitor should be withdrawn
from service immediately as it may no longer operate correctly. A replacement Sensor-
Battery Pack (Part number ONE O2-RS) should then be fitted.
The Sensor-Battery pack within the ONE O2 monitor must be replaced on or before the date
shown on the label which is found on the side of the product. The sensor – battery pack has
a 3-year life and should be replaced every three years. Older versions may have a 2 year
battery and sensor.
4.1 LOW / CRITICALLY LOW
The normal operation of the ONE O2 LOW / CRITICALLY LOW monitor is summarised in the
table below:
Normal (Monitored oxygen level
above the `Low Oxygen’ threshold
and battery voltage satisfactory.
Low Oxygen Alarm -19.5%
(Monitored oxygen level below the
`Low Oxygen’ but above the
`Critically Low Oxygen’ thresholds.
Critically Low Oxygen Alarm – 18%
(Monitored oxygen level below the
`Critically Low Oxygen’ threshold.
Low Battery (Battery voltage
unsatisfactory)
In the `Normal’ condition (monitored oxygen concentration is above the `Low Oxygen
Alarm’ threshold and the internal battery voltage is satisfactory) All LED’s will be off and
audible unit will be off.
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