The Safe-Ox+ is a simple to use and maintain ambient oxygen enrichment and depletion monitor for monitoring oxygen levels in a laboratory environment..

Contact us today to see why it is essential to monitor both high and low levels of oxygen in a laboratory.


The Safe-Ox+ oxygen enrichment and depletion monitor consists of a wall mounted main sensor unit and a repeater. It is ranged from 0 to 25% and has 1 low and 1 high audio/visual alarm. The sensor has a very long life and calibration is only required every 12 months and can be achieved using certified air.


Laboratories that store and operate with high levels of O2 need to detect and monitor the levels of oxygen – should there be a leak of enriched Othis could prove to be a fire risk.

The Safe-Ox+ oxygen enrichment and depletion monitor provides a high O2 alarm ideal if you are using pure oxygen in your lab to protect you from Oenrichment


The Safe-Ox+ oxygen enrichment and depletion monitor can be wall mounted at head height in the gas storage room or where the enriched O2 is piped. The unit comes with one repeater as standard which is located at the entrance to the room. 

O2 range

0.1 to 25%

Sensor accuracy

Better than ± 0.75% O2 over 5.0 to 25.0% O2

Response time (T90)

<60 seconds

Operating temperature

0 to +40 °C (+32 to +104 °F)

Temperature effect

0.2% of reading/°C or 0.1115% of reading/ °F

Atmospheric pressure range

811 to 1050 mbar absolute

Warm up time

10 seconds to normal operation, prior to calibration allow 2 hours to achieve full accuracy


Central unit = 175 x 105 x 75 mm, alarm repeater = 155 x 72 x 45 mm


Central unit = 600g, alarm repeater = 150g

IP rating

IP65 for central unit and alarm repeater, unless the alarm repeater is quick connect then it is IP43

Sensor type

Electrochemical cell

Sensor life

Up to 7 years in air


4 digit LCD


2 x alarm visual indicators, 1 x system fault indicator, 1 x status indicator, common audible alarm


One or two optional alarm relays with changeover contacts assigned to alarm 1, alarm 2 or system fault.
Contact rating 240 V AC or 30 V DC at up to 2 A, contacts are non-latching fail-safe


2 wire, 4 to 20 mA (max load 150 Ω)

Power supply options

210 to 250 V AC supply, 110 to 120 V AC supply, 9-24 V DC supply