Dual O2/CO2 Monitor


SKU: 99039 Categories: ,


This dual sensor monitor is designed for use in areas containing Helium, Argon, and/or Nitrogen, that contain CO2 as well. It includes 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.

Standard Features

  • 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

Additional information

Sampling Method & Range

Diffusion, 0-25% O2, 0-10,000ppm CO2


± 1% of Full Scale

Operating Temperature

-0 to +55 C


¾” back lit LCD digital display

Sensor Type

Long life zirconium oxide sensor for O2 and NDIR for CO2

Alarm Indicators

Built-in Audible 90dB horn, Orange LED alarm indicator for CO2, Red LED alarm indicator for O2

Signal Outputs

One user adjustable Alarm relay for Oxygen, One user adjustable Alarm relay for CO2. Relays are rated 2 amp 24VDC / 24VAC

Analog Output

Analog 4-20mA output, selectable for either Oxygen or CO2. Optional 0-5 VDC output for CO2.

Power Requirements

24VDC 350mA


6.5" (W) x 4.5" (H) x 3.25" (D)
165.1 mm x 114.3 mm x 82.5 mm


1.6 lbs. (.8 kg)



Required Calibration

None for Oxygen. None for CO2 when Auto Cal function is activated.

  • 24 VDC Power Supply (P/N 45101)
  • Horn and Strobe Combo (P/N 42002)
  • Remote Display (P/N 99091)