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Model TR9294


  • Measurement in conditioned spaces
    (i.e. home greenhouses)
  • Measurement in relatively clean environments free of condensation


Key Features

  • CO2 Ranges 2000 to 10,000 ppm
  • Dual analog outputs (voltage and 4-20 mA)
  • Self calibration algorithm based on background concentrations
  • Display option available
  • Measures CO2, Temp & Humidity
  • CO2 Ranges 2,00 to 10,000 ppm
  • Analog output or switched (relay) output
  • Dual bulb internal calibration method
  • Display option available


Wall Mount CO2 Monitor
For Mild Environments

  • Measures: 0-2,000 ppm CO2, Factory adjustable to 10,000 ppm
  • Accuracy: ▒ 30 ppm + 3% of reading
  • Power: 24 VAC
  • CO2 output: 0-10 V, 0-5 V, 4-20mA
  • Maintenance free for 15 years or more
  • Also available as a LonMark Certified Product for TR9292, TR9293 and TR9294 models
  • Now BACnet« Communicating

Engineering Spec


  • Same as model TR9294 above but mounted in a semi sealed black enclosure suitable for wall or in-duct mounting.
  • No display option


TR9291 In Duct /Wall Mount
CO2 Monitor



  • Same as model TR9294 but in splash resistant enclosure
  • Display option available


TR9293 Splash Resist Wall Mount



  • Measures: 0-2,000 ppm CO2 (0-5000 ppm range also available)
  • CO2 Accuracy: ▒ 50 ppm + 2% of reading
  • Temp Accuracy: ▒ 0.54║F (▒ 0.3║C)
  • RH Accuracy@ 68║F (20║C): ▒3% (30-70%RH), ▒5% (10...90%RH) (Only available in V output version)
  • RH Accuracy:
  • Power: 24 VAC
  • CO2, T Output: 0-10 V, 0-5 V, 4-20mA (Specify when ordering)
  • CO2, T & RH: 0-10 V, 0-5 V (Specify when ordering)
  • Switching (relay) output also available


EE80 Wall Mount Temp, CO2 RH (analog or relay output)

Datasheet Manual & Commisioning Guide
Published: February 16, 2004 Last Updated: May 15, 2013