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CT1O Series

CT1O CO2 Temp Outdoor
Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference

CT1O CO2/Temp Outdoor

Rugged enclusure Field replaceable CO2 element for lower total lifetime cost Made in the USA - Industry best 7-year warranty!

Adjustable for ranges of 2000, 5000, or 10,000 ppm CO2
Field replaceable dual-channel NDIR element
Dual 3-wire 4-20mA and 0-5/0-10V (selectable)
Rugged gasketed enclosure

  • 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
  • Non-dispersive infrared sensing element (NDIR)
  • Field replaceable dual-channel CO2 sensor
  • 15+ year life expectancy on CO2 sensing element
  • Industry leading 7-year limited warranty on electronics; NDIR module 3 years
  • ±30ppm, ±3% of reading


Featuring a gold plated dual-channel NDIR sensor for the best accuracy and the highest reliability for your outdoor or greenhouse sensing needs.  An optional built-in LCD display makes set up a snap, and a standard solid-state setpoint relay makes demand ventilation simple. Dual 4-20mA and 0-10/5 vdc outputs.  


- Controlling ventilation in response to occupancy
- Facilitates compliance with ASHRAE 62.1 standard for air quality
- Outdoor or greenhouse applications

Product Price Quantity
CT1O-K3D CO2 Outdoor LCD 20K Thermistor
$667.80 /


CT1O-K3X CO2 Outdoor NoLCD 20k Thermistor
$601.02 /


All prices shown are excluding tax unless otherwise specified.