SRC-C1T1 - Indoor


Indoor CO2 + temperature transmitter / monitor. Now with improved CO2 level indication.

The SRC-C1T1 is an indoor CO2 monitoring and temperature measuring transmitter. Three LEDs in the colors green, orange and red indicate the CO2 concentration of the room air. This shows the user when to ventilate. The device has two analog outputs and one relay output.

The CO2 concentration is measured through non-dispersive infrared (NDIR) waveguide technology with ABC automatic
background calibration algorithm. The applied measuring technology guarantees excellent reliability and long-term stability. The microprocessor samples the CO2 once per second. It calculates an averaging signal over a preset number of samples and generates the output signal.
The analog output signal range may be customized by jumpers and if required by a programming module. Standard signal ranges are 0…10 VDC and 2…10 VDC. Other ranges can be defined by using the external display and programming module (OPU-S).


  • Indoor CO2 and temperature measurement (home, office, school, restaurant, greenhouse, …)
  • Recording of minimum and maximum CO2 and temperature limits for critical environments
  • Direct control of extraction fan


  • Indoor CO2 and temperature measurement
  • Indication with three separate color LEDs
  • Minimum and maximum value memory
  • Two analog output signals for CO2 and temperature values
  • 0…10 V or 2…10 V measuring analog output signal selectable with jumpers
  • Relay output indicating CO2 concentration
  • Levels of CO2 indication programmable
  • Automatic CO2 background calibration
  • Output signal ranges programmable
  • May be used as simple P-controller
  • Averaging signal adjustable
  • Optional external display (OPU-S)
  • Status LED


 Product name  Product No.  Description
 SRC-C1T1  40-300198  CO2 + temperature transmitter / monitor


 Previous versions (other CO2 sensor)

 Product name  Product No.  Description
 SRC-C1T1-W1  40-300198-1  Signal range: 0...2000 ppm, -35...35°C (-31…95°F)
 SRC-C1T1-W2  40-300198-2  Signal range: 0...2000 ppm, 0…50°C (32…122°F)
 SRC-C1T1-W3  40-300198-3  Customer specific signal range


OPU-S - Remote Display
Operation and display for intelligent transmitters


Operation Manual

Install Sheet

Application Notes