Oxygen Deficiency Monitor for Glove Box with 10+ Year Sensor

Item #: 99021


Product Summary

The Glovebox Oxygen Deficiency Monitor is designed for small enclosures or vacuum environments using nitrogen or cryogenics. Monitor locations include pharmaceutical, semiconductors, hospitals, universities, and laboratories. The monitor remains accurate in inert environments down to 0% oxygen.


  • Designed for mounting on Glove Boxes
  • 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
  • No Drift due to Thunderstorms or barometric pressure changes
  • Local display, 4-20mA output
  • UL, C UL, and CE Approvals
  • 24V DC Power Supply Included (99021)
  • International Power Supply Included (99142)

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 replacement of the sensor for 10+ years.

The O2 monitor is used in laboratories using Nitrogen, and Argon. The monitor is also used in confined spaces, glove boxes, incubators, gas hoods, cryogenic gas storage, and research and development. The AirCheck 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
Range 0 – 25 %
Accuracy ± 1 % of Full Scale
Operating Temperature -40 to +55 ºC
Display ¾” backlit LCD digital display
Sensor Type Long-life zirconium oxide sensor cell
Sensor Life 10+ years under normal conditions
Signal Outputs 4-20 mA Analog Output
Dual-Level Alarm Relay Contacts
Power Requirements 24 VDC
250 mA
Dimensions 7.0(W) x 4.5 (H) x 4.5 (D) inches
177.8 mm x 114.3 mm x 114.3 mm
Weight 1.7 lb
.7 kg
Enclosure Polycarbonate
Required Calibration None
No Zero or Span Pot Adjustment Required
Country of Origin USA
Harmonized Tariff Code 8531.10.0045


Additional O2 Monitor Accessories List Price
8 Channel Controller $2,595.00 US (P/N # 99058)
Horn and Strobe  $160.00 US (P/N # 42002)
Remote Display $375.00 US (P/N # 99091)

Connects to SCADA and PLC Controls

The Air check O2 Deficiency Monitor is 24VDC powered and transmits continuous oxygen concentration levels to any system control data acquisition system, or programmable logic controller. The PureAire’s Oxygen Deficiency Monitor can also be operated remotely up to 1,000 meters or 0.6 miles from centralized controllers.

PureAire’s Oxygen Sensor Cell

The Air check O2 Deficiency Monitor uses an exclusive Current Limiting Zirconium Oxide Oxygen sensor that never requires a reference gas. Unlike concentration type zirconium cells that must have a reference gas, PureAire’s O2 monitor can operate in 100% nitrogen environments. Capable of detecting 0% up to 95% oxygen levels, the current limiting O2 sensor operates at a lower temperature than competitive concentration type cells. The average life of PureAire’s O2 sensor is over 10 years in most environments.
The Air check O2 Deficiency Monitor never needs 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; the only optional response test required is to subject the O2 system to nitrogen periodically.

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 a low-cost basic display-only monitor or a full-featured monitor with dual-level, user-selectable alarm relays. Other options available are Modbus digital communications or full Wireless radio communications.

Air Check O2 Glove Box Literature

Safety Risks of Oxygen Deficiency 

Air Check O2 25% DRAP 99021 Manual

Comparison O2 Zirconium Oxide vs EC cell

Comparison 10 Year Sensor vs Disposable (Electrochemical)

O2 Test Against other Companies

Oxygen Monitor Sales Presentation

Remote Digital Display p/n 99091

Horn/strobe 24VDC Red p/n 42002

horn and strobe

8 Channel Programmable Controller for O2 or Gas Monitors

8 Channel Programmable Controller for O2 or Gas Monitors