PureAire 99136 Class II Combustible Dust Explosion Proof Oxygen Monitor, 0-25%, with Long Life Year Sensor & RS-485 Serial Communication

PureAire's Explosion Proof Oxygen Deficiency Monitor is engineered for high-risk environments where inert gases such as nitrogen, helium, or argon are used. Designed with a rugged, explosion-proof enclosure, this monitor prevents ignition in areas with flammable dust, gases, or fibers-making it ideal for grain processing facilities, powder coating plants, oil and gas refineries, and similar hazardous locations.

Built to perform in extreme conditions, the monitor remains accurate in temperatures as low as -40°C. At its core is PureAire's long-life zirconium oxide sensor, which delivers reliable, non-depleting performance for over 10 years in typical use-eliminating the need for frequent sensor replacement and reducing long-term maintenance costs.

Features:

• 99136 - Suitable for Class 2, Div 1 & 2  Groups E, F, G/Includes RS-485 Serial Communication, IP66
• 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
• 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 100 ft
• 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 -40°C.

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 operator interface is via a menu-driven magnetic keypad, allowing full access without opening the enclosure.

The RS-485 feature provides serial communication between a PLC or PC and the monitor, which enables the monitor to transmit current relay and fault status.

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.