CO2, humidity, and temperature multi-sensor TSM400-4-CPTH

TSM400-4-CPTH is a CO2, humidity, and temperature multi-sensor with a MODBUS RTU interface.


CO2 (Carbon dioxide) is a colourless and odourless gas. It is the fourth most present gas in the Earth’s atmosphere. Its concentration, especially indoors, is important for the health and efficiency of the people in them.

TSM400-4-CPTH is a multi-sensor that supports MODBUS RTU protocol over the RS-485 interface. The sensor measures CO2 concentration, humidity, temperature and barometric pressure.

The MODBUS device integrates an advanced non-dispersive infrared sensing element (NDIR) for CO2 measurements. NDIR is recently the most popular principle for CO2 concentration measuring. The principle is based on the absorption of infra-red (IR) light with specific wavelengths by CO2 molecules.

The CO2sensing element is temperature compensated for better accuracy.

Self-calibration is available for carbon dioxide measurements. It is done if the sensor is left in fresh (around 400 ppm CO2 concentration ) air.

The basic sensing elements for humidity, temperature and barometric pressure are factory calibrated and do not require any lifetime recalibration.

CO2, humidity, and temperature multi-sensor TSH400-4-CPTH is housed in a slim plastic enclosure. The bottom part of the enclosure is suitable for installation on standard flush-mounted/cavity wall boxes with a maximum installation opening of 61 mm.


  • LED indicator for status of communication;
  • Long-term stability based on digital signal processing;
  • Self-calibration on fresh air for CO2 measurements;
  • Changeable communication parameters;
  • Non-volatile memory for all settings;
  • Firmware update via the interface.


  • Indoor air quality (IAQ);
  • CO2 storage facilities leakage control;
  • Smart ventilation systems;
  • Restaurants and breweries CO2 level monitoring.

The following models support TSM400-4-CPTH

  • GSM-GPRS remote IO moduleTCG140
  • Third-party controllers


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