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Home > Carbon Dioxide (CO2) > CO2 Outside Air

CO2 Outside Air

  • LCD with field calibration menu
  • 2000/5000 ppm CO2
  • Integrated set-point relay
  • Field replaceable NDIR element
  • Internal heater for reliability


  • Controlling ventilation in response to occupancy
  • Economizer control
  • Facilitating compliance with ASHRAE 62.1 standard for air quality


Senva CO2 sensors maximize energy savings by ensuring optimal ventilation. Measuring exterior CO2 levels ensures optimized economizer control. The CO2O series is an outside air sensor with NDIR sensing element and features that include a built-in heater, standard LCD, setpoint relay, menu selectable auto-calibration and provision to offset the reading +/-250ppm.

Product     Price   Quantity
CO2O-A Outside CO2 Transmitter/relaywith display and menu   $ 570.00


List prices shown; trade pricing appears on orderpad for Senva Trade Accounts.
For qualified trade pricing, please contact us at 866-660-8864.
Oregon has no sales tax.

Easy to install and maintain

  • Integrated display and push-button menus for field selectable scale, calibration, and operational modes
  • Dual 4-20mA and 0-5V/0-10V output (jumper selectable)
  • Integrated high-reliability solid-state set-point relay is ideal for direct control applications; easy to set up thanks to LCD

High reliability reduces call backs

  • Non-dispersive infrared sensing element (NDIR)
  • Field replaceable CO2 sensor
  • 15+ year life expectancy on CO2 sensing element
  • Industry leading 7-year limited warranty on electronics; NDIR module 3 years

High accuracy for improved system performance

  • Internal heater for reliable outdoor operation
  • Selectable auto-calibration mode returns sensor to baseline values
  • ±40ppm, ±3% of reading
Power Supply   12-30VDC/24VAC(1), 100mA max.
Analog Outputs Dual Analog 3-wire 4-20mA and 0-5V/0-10V (2) (jumper)
Output scaling 0 - 2000 or 0 - 5000 ppm (selectable)
Digital Setpoint Output Programmable Solid-state, 1A @ 30VAC/DC, N.O.
Sensor Performance Type Non-dispersive Infrared (NDIR)
Accuracy ±40ppm, ±3% of reading
Response time 60 seconds to 90% reading
Output update rate 3 seconds
LCD Menu Setup Parameters SPH, Setpoint, Hi (On point) 500ppm to full-scale (700ppm default)
SPL, Setpoint, Lo (Off point) 400ppm to full-scale-50 (600ppm default)
SCL, Scaling 0-2000ppm or 0-5000ppm
(2000ppm default)
ADJ, Adjustment Offset adjustment +/-250ppm (0 default)
CAL, Calibration mode Automatic mode ON or OFF (default=ON)
RUN, Run mode Displays CO2 in ppm
Operating Environment Temperature 0 to 122F (-18 to 50C)
Humidity 0-95% non-condensing
Enclosure Material Polycarbonate; aluminum tube
  Dimensions 3.7”h x 3.7”w x 2.24”d
  1. One side of transformer secondary is connected to signal common. Dedicated transformer is recommended.
  2. 15-30VDC/24VAC power supply voltage required for 10 volt output.