Oxygen Deficiency Monitor w/ 10+ Year Sensor

PureAire oxygen monitor nitrogenPureAire O2 monitor 0-25%PureAire O2 deficiency monitors 0-25%


Item #: TX-1100DRA (99016)

Product Summary

The Air Check oxygen deficiency monitor is perfect for facilities using nitrogen, helium, and argon. The monitor is also suited for use in confined spaces, cryogenic facilities, and freezers. The monitor remains accurate at temperatures as low as -40C. Our long lasting zirconium oxide sensor lasts for 10+ years.

  • 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
Sampling MethodDiffusion
Gases DetectedOxygen (O2)
Range0 – 25 % O2
Accuracy± 1 % of Full Scale
Operating Temperature-40 to +55 ºC
Display3/4″ LCD Digital Display, Back Lit
Sensor TypeLong life zirconium oxide sensor cell
Sensor Life> 10 years under Normal Conditions
Signal Outputs4-20 mA Analog Output
Dual Level Alarm Relay Contacts
Power Requirements24 VDC
250 mA
Width5 in
127 mm
Height5 in
127 mm
Depth3.25 in
83 mm
Weight1.6 lb
0.8 kg
EnclosureNema 4X
Required CalibrationNone
No Zero or Span Pot Adjustment Required


Additional PartsList Price
24 VDC Power Supply$39.00 US (P/N # 45101)
Horn and Strobe Combo$145.00 US (P/N # 42002)
Remote Display$325.00 US (P/N # 99091)


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.

Oxygen Deficiency Monitor 0-25% Literature

DRA case drawing

Air Check O2 25% DRA 99016 Manual

Price Savings for PureAire sensor vs Disposable Sensors

Comparison O2 Zirconium Oxide vs EC cell

Oxygen Monitor for horn/strobe or remote display

PowerPoint Presentation O2 Monitor

Multiple O2 monitors to controller

Remote Digital Display p/n 99091


Power supply p/n 45101 24V for US users

Power supply pn 45101 UL-1

Horn/strobe 24VDC Red p/n 42002

horn and strobe