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ONE O2 OXYGEN MONITOR ALARM UNITS
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INTRODUCTION
The ONE O2 monitor continually monitors the air surrounding the sensor on its base and
provides visual and audible alarms when the monitored concentration of oxygen passes pre-
set `Alarm’ levels.
There are 3 models of ONE O2 monitor units for different oxygen deficiency and enrichment
applications. Please ensure you have correctly identified the model type and refer to the
appropriate sections of this manual. To identify the model type check the text adjacent the
red LEDs on the face plate.
Low / Critically Low
For oxygen deficiency applications
Alarm 1 Set 19.5% LOW OXYGEN ALARM
Alarm 2 Set 18.2% CRITICALLY LOW OXYGEN ALARM
High / Critically High
For oxygen enrichment applications
Alarm 1 Set 22% HIGH OXYGEN ALARM
Alarm 2 Set 23% CRITICALLY HIGH OXYGEN ALARM
High / Low
For combined enrichment and deficiency applications
Alarm 1 Set 22% HIGH OXYGEN ALARM
Alarm 2 Set 18.2% LOW OXYGEN ALARM
Please note the alarm thresholds shown above are the current default settings. Older
equipment may have different alarm thresholds. Please refer to the calibration certificate for
threshold settings specific to an item of equipment.