**Please Note: The CO2Meter offices will be closed for the Memorial Day Holiday beginning at 5:00PM EDT Friday, May 27, 2022. All operations will reopen Tuesday, May 31 at 8:30AM EDT. Orders placed after 11:00 am et. May 27 will be fulfilled on Tuesday, May 31.**

aSense MIII CO2 & CO Wall or Duct-Mount Transmitter

aSense MIII CO2 & CO Wall or Duct-Mount Transmitter
Regular price $849.00 Sale price

Compare at $925.00

POs or wholesale quantity discounts click here

  • CO2 and CO Combined
  • Auto Repair Shops
  • Parking Decks & Garages
  • Enclosed Arenas

The aSense MIII combines carbon dioxide and carbon monoxide sensors in a single package. It measures CO and CO2 in real time, and can use the levels to trigger an alarm, turn on a ventilation fan, or return the values to a HVAC system.


  • State-of-the-art NDIR technology measures CO2
  • Internal automatic self diagnostics
  • Indicator light for normal, elevated, and alarm conditions
  • Internal relay to run alarm, vent fan or duct actuator
  • Conforms to OSHA specifications
  • Maintenance free – no calibration required
All the functions can be set in software. Click here to download the free UIP software for aSense.


Order SE-0114-D to receive the device with the Duct Mounting Kit.


  • 0-10,000ppm CO2, 0-100ppm CO
  • Output: 0-10VDC CO, 0-10VDC CO2 (4-20 mA with jumpers)
  • Relay, Closed: <30ppm CO, <1400ppm CO2
  • Relay, Open: >35ppm CO, >1500ppm CO2
  • Covers approx. 9,000 sq. feet
  • Programmable thresholds
  • Modbus


  • 24 volts AC/DC (Optional International Wall Adapter available if needed depending on electrical supply (CM-0106)
  • Relay Amperage:  0.5 amp @ 125 AC  or  1.0 amp @ 24 DC
  • IP54 housing designed for outdoor use (NEMA 3S equiv.)
  • HxWxD: 142 × 84 × 46 mm


  • 1 year - See CO2Meter Terms and Conditions. 
  • Data Sheets

  • Manuals

  • Technical Documents

  • Videos

  • Additional Resources

Customer Reviews

Based on 1 review
ricardo trevino
Muy buen producto

Trabaja de manera precisa, ideal para proyectos LEED

"Easy to install, easy to set up, and easy calibration - just what I was looking for."

- Phillip Farrar
Water Plant Superintendent

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