aSense Ventostat 2,000ppm CO2 + RH/T |
**IMPORTANT: With an abundance of caution for our employees health and safety the CO2Meter offices will be closed Thursday, September 29 and Friday, September 30 because of the pending impact of Hurricane Ian. Orders placed online will be fulfilled once our offices reopen.**

aSense Ventostat 2,000ppm CO2 + RH/T

aSense Ventostat 2,000ppm CO2 + RH/T
Regular price $849.00

POs or wholesale quantity discounts click here

  • LEED Projects & Credits
  • Green building design
  • Green building certification
  • CO2-Controlled Fan or Alarm

The aSense is an all-digital, low-cost CO2 and temperature transmitter for installation in a building’s climate zone. It measures both carbon dioxide concentration and temperature in real-time, and returns the values to the HVAC system.

The aSense is a key component in green building projects and is designed to maximize LEED credits for both LEED design retrofits and new LEED buildings. Studies show that demand-controlled HVAC systems using CO2 can save up to 50% of energy costs as well as improving comfort for the occupants.

For installations that need to drive a fan, alarm, horn, flasher, etc, the aSense -RL includes a normally open relay programmed to close at 1,000ppm.


  • SE-0115: 0-2,000ppm CO2, temp, 4-20mA or 0-10VDC outputs
  • SE-0111 -Disp RL: includes above + LCD Display, 1 Amp relay


  • State-of-the-art Non-Dispersive Infra-Red (NDIR) technology to measure CO2
  • Cost-optimized for connection to LEED, DCV or HVAC systems
  • Contributes to lower energy costs when it is applied in a Demand Control Ventilation (DCV) strategy
  • Internal automatic self-diagnostics
  • Maintenance interval > 5 years
  • Serial communication port for connection to a PC or a GSM module
  • 2 analog outputs as standard (V/mA)
  • Relay output as an option
  • Cost-efficient RS485 or LonWorksTM local network communication options
  • Internal 2-channel logger as an option
  • Meets ISO 12039 Standard for NDIR detection of CO2


This device will NOT meet requirements for CO2 safety monitoring which requires a Fixed/Wall mounted, hard-wired alarm per the NBIC, NFPA, or IFC regulations. Refer to our CO2 Safety Products page for devices that meet your needs.

Call us at (877) 678-4259 toll-free or email us to speak with our technical sales team about purchasing the correct device.


  • Operating Principle: Non-dispersive infrared (NDIR) with Automatic Baseline Correction
  • Response Time (T1/e): 2 min. diffusion time
  • Accuracy: ± 1% of measurement range ± 5 % of measured value
  • Pressure Dependence: +1.58% reading per kPa deviation from normal pressure, 100 kPa
  • Annual Zero Drift: < ± 0.3 % of measurement range
  • Measurement ranges: 0 – 2,000 ppm (standard)
  • Temperature Range: -20 to +60 C


  • Power Input: 24 VAC/VDC ± 20%, 50-60 Hz (half-wave rectifier input)
  • Power Consumption: < 3 Watts average
  • Wiring Connections: screw terminals, European and US standard J-boxes
  • Dimensions: 120×82×30mm (4.7×3.3×1.2in) HxWxD


  • 2 years manufacturer - See CO2Meter Terms and Conditions. 
  • Data Sheets

  • Manuals

  • Technical Documents

  • Videos

  • Additional Resources

  • Case Studies

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"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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