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.

Features:

• 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.

Applications:

• 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:

• 4G LTE universal IO module TCG140-4
• Energy monitoring module TCW260
• GSM-GPRS remote IO module TCG140
• Third-party controllers

Warranties - Returns:
Money Return:	Repair - Replacement:
20 days	36 months

Specifications
Physical characteristics
Dimensions	81 x 81 x 30 mm
Weight	66 g
Environmental limits
Operating temperature range	-20 to 60°C
Operating relative humidity range	5 to 95% (non-condensing)
Storage temperature range	-20 to 60°C
Storage relative humidity range	5 to 95% (non-condensing)
Ingress protection	IP20
Power requirements
Operating voltage range (including -15/+20% according to IEC 62368-1)	4.5 to 26 VDC
Current consumption	25 mA@5VDC (Peak: 150 mA@5VDC)
CO2 measurements
Range	400 to 5000 ppm
Accuracy	± (40 ppm + 5 %)
Resolution	1 ppm
Calibration	Automatic, if the sensor is exposed to fresh air for more than 30 minutes.
Pressure measurements
Range	10 to 1200 hPa
Accuracy (min)	±1.5 (25°C, 750 hPa)
Accuracy (max)	±2.5 (-20°C to + 85°C, 300 to 1100 hPa)
Resolution	1 hPa
Humidity measurements
Accuracy (min)	±3.0 %RH (in 20 to 80 %RH range)
Accuracy (max)	±5.0 %RH (in 5 to 95 %RH range)
Resolution	0.1 %RH
Temperature measurements
Accuracy (min)	±0.4 °C (in -10 to +60°C range)
Accuracy (max)	±0.6 °C (in -20 to +60°C range)
Resolution	0.1 °C
Warranty
Warranty period	3 years