The QFM331 Oxygen Monitor may be used as a stand-alone device with its own audible and visual alarms, or linked to other repeater modules to mimic the condition of the monitor. Repeater modules can be connected to the QFM331 and located outside the monitored area to warn users at the point of entry. The system can be fully customised to allow multiple location monitoring and further modules can be easily added at a later date to expand the scope of the system.
Operating conditions Temperature -5 to + 45 oC (-20 to +50 at lower accuracy).
Humidity 0 to 99% RH non-condensing
Pressure range atmospheric +/-10%
Oxygen concentration 0 –25%.
Case material Black anodised aluminium with GRP front panel.
Dimensions (excl. bracket) 165 (H) x 90 (W) x 55 (D) mm.
Weight Approx. 550 gms (0.55 Kg).
Indications 5 LEDs and Audible Alarm
Electrical Connection Socket on top face for connection only to approved dedicated units.
Standard Alarm Thresholds High Oxygen 21.8% oxygen.
Critically High Oxygen 23.8% oxygen. Special levels available upon request.
Response time Typically less than 10 secs. for alarms to activate calibrated QFM331 when sensor subject to 24% oxygen test gas
The sensor pack (QM330RS) has an expected operating life of two years in air whilst the battery lifetime depends on the proportion of its life the QFM331 spends in an alarm state. For a battery life of two years of normal operation the QFM331 typically can spend 26 days in continuous `High Oxygen’ alarm state or 22 days in continuous `Critically High’ alarm state.