PureAire Monitoring Systems, Inc.
557 Capital Drive
Lake Zurich, IL 60047-6711
Toll Free: 1-888-788-8050 · Phone: 847.726.6000 · Fax: 847.726.6051
Email: infopureaire@dls.net · Website: www.pureairemonitoring.com

Air check Oxygen Deficiency Monitor for Nitrogen, Helium, CO2, & Argon > Item #

  • 10 + Years No Calibration Sensor
  • Two-Alarm Relays for 19.5% and 18.0%
  • No Maintenance Required
  • Ultra Loud Built-in audible alarm 90 db
  • 3 Year Warranty
  • Digital Display, 4-20mA Analog Output
  • Low 450ºC temperature Zirconium Oxide Sensor
  • Operates in Freezers at - 40 ºC
  • No Drift due to Thunderstorms or barometric pressure changes
  • Wall mounting brackets and optional plug-in wall power supply
  • UL, C UL and CE Approvals

**Click Here ** for other available models. Others include Explosion Proof, Sample Draw, and Glove Box Versions

Features · Specifications · Advantages


    PureAire Monitoring Systems is a leading manufacturer of O2 monitors. We created a better product that eliminates the inconvenience of disposable sensors while continuing to meet your needs. When it comes to O2 deficiency detection, PureAire makes the longest lasting, most reliable and affordable oxygen monitors. There are no hidden costs and no replacing of the sensor for 10+ years.

    The O2 monitor is used in laboratories using Nitrogen, Helium, and Argon. The monitor is also used in confined spaces, hyperbaric chambers, cryogenic gas storage areas, and freezers. The Air Check oxygen Monitor uses a long-lasting zirconium oxide sensor and responds to changing conditions within seconds at temperatures down to -40C.

    Easy to operate, the O2 monitor‘s joystick controls an audible alarm with visual alarm indicators. The instrument uses a local display and can be linked to fire alarm systems.

    The monitor requires no maintenance or calibration due to its non-depleting long life sensor. Built in “supervised watchdog” software continuously monitors all instrument functions 24/7. PureAire’s Oxygen monitor is not affected by humidity, temperature, or changes in barometric pressure. Rapidly changing barometric pressure from thunderstorms will not disrupt PureAire’s oxygen deficiency monitor. The majority of oxygen monitors sold use depleting electrochemical sensors that require frequent maintenance and calibration. PureAire’s Oxygen monitor can save up to $400 annually in replaceable sensors.

Sampling Method Diffusion
Gases Detected Oxygen (O2)
Range 0 - 25 % O2
Accuracy ± 1 % of Full Scale
Operating Temperature -40 to +55 ºC
Display 3/4" LCD Digital Display, Back Lit
Sensor Type Long life zirconium oxide sensor cell
Sensor Life > 10 years under Normal Conditions
Signal Outputs Back Lit Digital Display and Audible Horn Set to 19.5 % OSHA Level
Power Requirements1 24 VDC
100 mA
Width 5.5 in
140 mm
Height 10.5 in
267 mm
Depth 3.25 in
83 mm
Weight 1.6 lb
0.8 kg
Enclosure Nema 4X
Required Calibration None
No Zero or Span Pots Supplied
Additional Parts List Price
24 VDC Power Supply $39.00 US (P/N # 45101)
Horn and Strobe Combo $145.00 US (P/N # LP7-18-30R)
Remote Display $225.00 US (P/N # DPM942-R)


No Disposable Cells to Replace

The heart of the monitoring system is a long lasting zirconium sensor, which responds to low oxygen conditions within seconds and provides accurate measurements over a wide temperature and humidity range. The zirconium O2 sensor cell will operate continuously for 10 or more years and requires an absolute minimum of maintenance. There are no zero or span calibration pots to adjust and when compared to disposable type sensors, our long life zirconium O2 sensor can save up to $475 annually and will pay for itself in just over 2 years!
Ideal for continuously monitoring oxygen levels in confined spaces or basement areas where CO2 and nitrogen inert gas is stored, the Air check O2 sensor does not drift or loose sensitivity. When levels reach the OSHA action level of 19.5 %, the built-in horn activates to warn employees of a hazardous situation. All system electronics are continuously supervised and any faults are automatically detected and displayed on the gas concentration display.

No Calibration Required

The Air check O2 Deficiency Monitor does not require quarterly calibration. The earth is a wonderful source of calibrated oxygen, and under ambient levels PureAire’s O2 monitor is continuously being challenged to 20.9 %. There are no zero or span adjustments to make or expensive maintenance people to hire.

Plug & Play Operation

The Air check O2 Deficiency Monitor is ready to go right out of the box. Just mount it to wall or other surface and plug in the power supply, (optional) into any wall socket. After a 4-minute start-up sequence, the monitor automatically starts operating. It’s designed for unattended supervised 24/7 leak detection for years. Supplied with a full 3-year warranty, the Air check O2 will be the last monitor you’ll need to purchase.

PureAire’s Oxygen Monitor Installations

The Air check O2 Deficiency Monitor is used in restaurants where CO2 and nitrogen are used to dispense beverages, Tire sales and repair centers to protect employees when filling tires with nitrogen, MRI facilities to protect against helium leaks used to cool the magnets, and Food processing facilities to alert personnel of nitrogen leaks from freezer tunnels. PureAire’s Air check O2 continuous monitor can provide comfort in protecting your employees from entering potentially hazardous situations if a leak occurs.

O2 Monitor System Features

The Air check O2 Deficiency Monitor is available in many different configurations. PureAire uses a sophisticated built-in CPU that is flexible to provide users with an inexpensive monitor with local display and alarm. We can also provide a full-featured monitor with dual level, user selectable alarm relays with hysteresis for controlling CO2 and nitrogen supply valves.