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CT1D Series

CO2/Temp Duct Sensor
Higher Reliability, Faster Installation, Superior Accuracy | Sense the Difference

  • LCD display with field calibration menu
  • Adjustable for ranges of 2000, 5000, or 10,000 ppm CO2
  • Integrated set-point relay
  • Field replaceable NDIR element

  • 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 CO2 sensor
  • 15+ year life expectancy on CO2 sensing element
  • Industry leading 7-year limited warranty on electronics; NDIR module 3 years
  • Selectable auto-calibration mode returns sensor to baseline values
  • ±40ppm, ±3% of reading


Self-calibrating NDIR sensor for high accuracy. A built-in LCD display makes set up a snap, and a standard solid-state setpoint relay makes demand ventilation easy. Probe is non-directional for accurate readings and ease of installation. 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
  • Offices, conference rooms, and public assembly areas
Product Price Quantity
CT1D-L3X CO2 DuctNo LCD 100K Thermistor
$492.90 /


All prices shown are excluding tax unless otherwise specified.