PureAire 99020 Explosion Proof Oxygen Monitor with 10+ Year Sensor

• 99020 – Suitable for Class 1, Div 1 & 2, Groups B, C, D, Zones 1 & 2, Groups IIB+H2, IIA
• Long-life 10+ year average sensor life
• Two-alarm relay setpoints available or alarm defaults are set for 19.5% and 18.0%
• No scheduled maintenance required
• 3-year warranty
• Digital display
• 4-20mA analog output (Active)
• No Drift due to thunderstorms or barometric pressure changes
• Wall mounting brackets
• Built-in flow sample pump up to 100ft
• CE, UL, and C UL approval on enclosure

The Explosion Proof Oxygen Monitor offers long-lasting O₂ deficiency detection. PureAire’s oxygen monitors are reliable, affordable, low maintenance, and provide continuous monitoring for an average of 10 years and more.

Ideal for use in electrically classified locations, confined spaces, analyzer shelters, petrochemical plants, cryogenic gas storage, and locations requiring remote sampling. The EX oxygen monitor can detect leaks of inert gases such as nitrogen, helium, and argon. The explosion-proof oxygen monitor can detect gas leaks at temperatures as low as -40C.

The monitor features an easy-to-read local display, visual LEDs, and an audible alarm. The oxygen monitor can be linked to fire alarm systems for notification of all employees.

The zirconia sensor is not sensitive to temperature, humidity, or barometric pressure changes (including thunderstorms). Unlike other oxygen monitors, replacement sensors are not required, since we use a zirconium sensor, rather than a disposable electrochemical sensor lasting 1-2 years on average. “Supervised watchdog,” software runs 24/7 checking electronics and components. Any errors or inconsistencies are reported on the display.

Advantages

Connects to DCS and PLC Controls

PureAire’s Explosion Proof Oxygen Monitor continually checks oxygen concentration levels and relays information to the distributive control system, PureAire’s single or multichannel controllers, or a programmable logic controller. The Explosion Proof Oxygen Monitor can be operated remotely over a 0.6-mile or 1,000-meter radius.

Improved Oxygen Sensor Cell

Rather than the electrochemical sensor used by most companies, PureAire uses a current limiting zirconium oxide sensor. This sensor runs reliably without a reference gas, so it can be used in all-nitrogen environments. The earth provides calibrated oxygen. When everything is at an ambient state, the sensor is challenged by approximately 20.9 percent oxygen. PureAire’s Explosion Proof Oxygen Monitor checks 0 to 100 percent oxygen levels and can operate at a lower temperature than the competition while needing no calibration. A simple, periodic span adjustment may be necessary. No scheduled maintenance is required to use the sensor; however, you may wish to subject it to nitrogen to test its response periodically.

Features of the Explosion Proof Oxygen Monitor 

PureAire’s Explosion Proof Oxygen Monitor comes with several configurations. All units have a built-in CPU and a low-cost, basic display-only monitor. For additional capabilities, a full-featured dual-level monitor is available. The unit features built-in alarm relays and an air check program that monitors sample flow, sensor cell, and electronics. For full transparency, fault information is transmitted to the alarm relay, front panel LED, and mA output.

99020/99045-Explosion-Proof Oxygen Monitor Literature

99020-Explosion-Proof Oxygen Monitor Manual

Safety Risks of Oxygen Deficiency 

NIH – Protocol for Use & Maintenance of Oxygen Monitoring Devices 2021

O2 EX Monitor Relays and Remote

Comparison O2 Zirconium Oxide vs EC cell

Comparison of 10-Year Sensor vs. Electrochemical

O2 Test Against other Companies

Oxygen Monitor Sales Presentation