Sensors That Make Buildings Smart!
Reference on AirTest: Understanding The Parking Garage Opportunity
CO2 Reference Library
Background on Carbon Monoxide Sensing Technologies for Parking Garages
Using CO2 to Control Odors in Parking Facilities
Carbon Dioxide Characteristics
CT1000 Layout
CT1000 Wiring
CT1000 Figure 1
CT1000 Figure 3

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Model CT1000
1 Gas with Relay


  • Used to directly activate fans or alarms based on a target concentration of gas
  • Used where a low-cost integrated sensor and control option is desired


Key Features

  • Can be utilized with most AirTest Gas Sensors
  • All CT1000 sensors can be integrated into same enclosure
  • High and low relay activation points and adjustable time delay
  • Multiple units can be daisy chained to control a zone
  • Rugged enclosure
  • CSA certified
  • Now also available with LonWorks® communication capability as a LonMark® Certified product.



  • Integrated gas sensing options include solid state detection of CO, Combustibles, R22, R134a, Ammonia
  • Other gas sensing options require remote sensor mounting from control

Single Gas
Sensor / Controller


Model CT1000

  • Temp Range: -4 to 122°F (-20 to 50°C)
  • Integrated high and low concentration relays (5A)
  • Power options: 24 VAC, 115 VAC, 220 VAC
  • User adjustable delay for on-time (up to 30 minutes)
  • Power and relay activation lights
  • Calibration: 1 year recommended
  • When ordering specify desired gas measured and high and low activation levels

Datasheet Manual
Published: February 16, 2004 Last Updated: October 28, 2008