Sensors That Make Buildings Smart!
AirTest CO2 Control Brochure
The Free AirTest CO2 Ventilation Calculator Tool
Suggested CO2 Sequence Of Operation
CO2 In School Classrooms
CO2 Reference Library
Reduce Over Ventilation And
Energy Waste with CO2
Background on CO2 for Ventilation Control
Explanation of CO2 sensor self calibration for TR9220 and TR9290
Why" Length Matters" for CO2 meansurement (TR9220, TR9290)
Technical background on CO2 DCV
Using CO2 to measure combustion fumes
Using CO2 to control smoking in hospitality venues
Assessing buildings for CO2 retrofit
CO & energy savings case studies
AirTest CO2 energy analysis software
AirTest Training Center

Contact Us
Call us to order or for applications assistance.
Monday to Friday
8:00 AM to 5:00 PM, PST
Ways to Pay
We accept orders through our website or by phone.

Next Day Delivery
Orders must be received by 1:00 pm PST during business hours.

Mailing List
You can subscribe or unsubscribe to our Mailing List at any time.

EE245 CO2 Temp RH Wireless Transmitter



  • Commercial buildings
  • Schools & universities
  • Retail
  • Theaters, auditoriums, gyms, churches
  • Hospitality venues
  • Industrial


Key Features

The sleek all mount wireless transmitter EE245 combines measurement of humidity, temperature and CO2. The transmitter has been especially developed for use in offices, museums and living spaces. Measurement values for humidity, temperature and CO2 may be shown on an optional display. The wireless transmitter is powered by batteries, but can also be connected to an external power supply. Depending on the measuring rate and variables, the battery life may last up to 3 years.

  • Measurement of temperature, humidity and CO2
  • 500 transmitters in one wireless network
  • Uses four 1.5 V AA standard batteries
  • Battery life up to 3 years
  • External power supply possible
  • Optional display
  • Winner of the AHR Innovation Award 2012

EE245 Wireless Transmitter


  • Measures CO2 Temp & Humidity
  • 2.4 GHZ communication
  • Uses IEE 802.15.4 communication protocol
  • Transmission distance of 1000 m (3000 ft) in open field
  • Must be used with EE242 Base Station





Key Features

The base station EE242 is used to configure the entire wireless network and to log measurement data. The integrated web server allows the user to adapt the wireless network individually and conveniently via the digital Ethernet interface without requiring additional software on your PC. Modbus (RTU and TCP/IP) is supported for integration in a bus system. Four analogue outputs are also available for further processing of the measurement values.

  • Option of administrating up to 500 transmitters
  • Web server
  • Ethernet interface
  • Modbus (RTU and TCP/IP)
  • 4 analogue outputs
  • 4-line display
  • DIN rail mounting



EE242 Wireless Base Station


  • 2.4 GHZ communication
  • Uses IEE 802.15.4 communication protocol
  • Transmission distance of 1000 m (3000 ft) in open field
  • Outputs: Analog, Digital, Ethernet, Modbus



Using the EE242 Data-logging Function via Modbus RTU
EE240 Webserver Protocol
Published: April 15, 2013 Last Updated: April 15, 2013