- 99020 – Suitable for Class 1, Div 1 & 2, Groups B, C, D, Zones 1 & 2, Groups IIB+H2, IIA
- 99045 – Suitable for Class 2, Div 1 & 2 Groups E, F, G
- 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.
By installing PureAire’s explosion-proof oxygen monitor, you can save as much as $400 annually and reduce the time-intensive cycle of replacing sensors.
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. It 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.
One-Step Sensor Adjustment
PureAire Oxygen Deficiency Monitors require occasional testing with nitrogen to validate the sensor’s response to low oxygen levels. While calibration is not necessary for our monitors to accurately measure oxygen depletion levels1, annual fine-tuning might be needed to ensure the sensor’s span accurately corresponds to the standard 20.9% oxygen concentrations.
PureAire’s Auto-Span not only simplifies the process of adjusting the span of the oxygen sensor but also provides a quick check of the sensor and the monitor’s response to an oxygen-deficient atmosphere. With a press of a button, this feature saves you time and money, protects your facilities and employees, and, most importantly, provides you with the reassurance of consistently reliable performance, making it a valuable addition to your safety measures.
1Please follow your facility’s safety guidelines and state and local regulations regarding calibration requirements for safety equipment.
Features of the Explosion-Proof Oxygen Monitor
PureAire’s Explosion-Proof Oxygen Monitor comes in 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.