Dual O2/CO2 Monitor

PureAire Dual O2/CO2 monitor viewPureAire Dual O2/CO2 monitorside viewPureAire Dual oxygen/ Carbon dioxide monitor


Item #: 99039

Product Summary

This duel sensor monitor is designed for use in areas containing Helium, Argon, and/or Nitrogen, that contain CO2 as well. It includes all of the top of the line features of our air check oxygen deficiency monitor, though it monitors the level of CO2 in the room as well. It is ideal for use in environments such as breweries, beverage or other bottling plants, pharmaceutical manufacturing facilities, or grow rooms. This monitor contains a 10+ year zirconium oxide sensor.

The PureAire Dual O2/CO2 Monitor is a compact gas monitoring system that’s ideal for the continuous monitoring of both gases simultaneously in N2 gas storage areas, CO2 beverage gas distribution areas, confined spaces, and other locations where low oxygen levels may pose a hazard to personnel. Unlike continuously depleting electrochemical sensor cells, the PureAire Dual O2/CO2 exclusive zirconium cell and patented NDIR cell provide stable oxygen and CO2 readings even in areas where temperature, barometric pressure and humidity levels are changing. The PureAire Dual O2/CO2 oxygen sensor requires no quarterly calibration or annual maintenance and the CO2 sensor automatically adjusts to ambient levels. Just plug it in and leave it alone.

  • No maintenance zirconium O2 cell and long life CO2 sensor
  • No calibration required for oxygen
  • Self-calibrating CO2 sensor
  • Local backlit concentration display
  • Built-in audible horn
  • Built-in visual LED alarm indicators
  • Alarm level 1 and 2 for O2 and CO2
  • No drift due to environmental or temperature changes
  • 3 year warranty
Sampling Method & RangeDiffusion, 0-25% O2, 0-10,000ppm CO2
Accuracy± 1% of full scale
Operating Temperature-0 to + 55 C
Display¾” backlit LCD digital display
Sensor TypeLong life zirconium oxide sensor for O2 and NDIR for CO2
Alarm indicatorsBuilt-in Audible 90dB horn, Orange LED alarm indicator for CO2, Red LED alarm indicator for O2
Signal OutputsOne user adjustable Alarm relay for Oxygen, One user adjustable Alarm relay for CO2. Relays are rated 2 amp 24VDC / 24VAC
Analog OutputAnalog 4-20mA output, selectable for either Oxygen or CO2. Optional 0-5 VDC output for CO2.
Power Requirements24VDC 350mA
Dimensions6.5 (W) x 10.5 (H) x 3.25 (D) inches; (140 x 267 x 83 mm)
Weight1.6 lbs. (.8 kg)
EnclosurePolycarbonate general purpose
Required calibrationNone for Oxygen. None for CO2 when Auto Cal function is activated.
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 calibration required

The Dual O2/CO2 Monitor does not require quarterly calibration. The earth is a wonderful source of calibrated oxygen, and under ambient levels, PureAire’s Combo monitor is continuously being challenged to 20.9%. Additionally the ambient earth levels of CO2 are 400ppm. Every week, or on demand, the monitor automatically adjusts to ambient CO2 levels. There are no zero or span adjustments to make or expensive maintenance required.

Plug & Play Operation

The Dual O2/CO2 Monitor is ready to go right out of the box. Just mount it to wall or other surface and plug in the power supply into any wall socket. After a 4-minute start-up sequence, the monitor automatically starts operating. It’s designed for unattended 24-7 leak detection for years. Supplied with a full bumper-to-bumper warranty, the Combo O2/CO2 will be the last monitor you’ll need to purchase.

PureAire’s Dual O2/CO2 monitor installations

The Dual Monitor is used in restaurants where CO2 and nitrogen are used to dispense beverages and agricultural grow rooms to alert and protect personnel from entering potentially hazardous situations if a leak occurs. Ideal for continuously monitoring oxygen and CO2 levels in confined spaces or areas where inert gases are used, the Dual O2/CO2 Monitor does not drift or loose sensitivity when the weather or temperature changes.

Dual O2/CO2 monitor Control Features

The Dual O2/CO2 Monitor has individual dedicated user selectable relays designed to operate on-off valves for the control of CO2 injection in grow rooms while simultaneously activating alarms when oxygen levels get too low. The oxygen sensor can also be used for controlling nitrogen generators for hypobaric rooms while using the CO2 sensor to alarm to TLV levels of carbon dioxide. PureAire uses a sophisticated built-in CPU that provides users with an inexpensive monitor with local display, safety alarms and control for both oxygen and carbon dioxide simultaneously.

Dual O2/CO Datasheet (PDF, 203KB)

PureAire Dual O2 / CO2 Monitor Manual (PDF, 1,61MB)

Comparison of annual maintenance (PDF, 552KB)

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