CO2, Humidity, and Temperature Multi-Sensor TSM400-4-CPTH

Industrial Automation Systems - Multi Sensor TSM400-4-CPT

Carbon dioxide (CO2) is a colorless and odorless gas, constituting the fourth most abundant gas in the Earth's atmosphere. Monitoring its concentration, especially in indoor environments, is crucial for maintaining the well-being and productivity of occupants.

TSM400-4-CPTH is a versatile multi-sensor equipped with MODBUS RTU protocol support via the RS-485 interface. This sensor excels at measuring CO2 concentration, humidity, temperature, and barometric pressure.

For CO2 measurements, this MODBUS device employs an advanced non-dispersive infrared sensing element (NDIR), a prevalent method for accurately gauging CO2 levels. NDIR relies on the absorption of specific wavelengths of infrared (IR) light by CO2 molecules. The CO2 sensing element is temperature-compensated for heightened accuracy.

The sensor offers self-calibration capabilities for CO2 measurements, initiated when placed in fresh air with approximately 400 ppm CO2 concentration. Moreover, the basic sensing elements for humidity, temperature, and barometric pressure come factory-calibrated, eliminating the need for lifetime recalibration.

The TSM400-4-CPTH multi-sensor is housed in a slim plastic enclosure, suitable for installation on standard flush-mounted or cavity wall boxes with a maximum installation opening of 61 mm.

Key Features:

  • LED indicator to signal communication status
  • Long-term stability achieved through digital signal processing
  • Self-calibration for CO2 measurements in fresh air
  • Configurable communication parameters
  • Non-volatile memory for storing settings
  • Firmware updates via the interface


  • Indoor air quality (IAQ) monitoring
  • Control of CO2 leakage in storage facilities
  • Smart ventilation systems
  • Monitoring CO2 levels in restaurants and breweries

TSM400-4-CPTH is compatible with the following models:

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

This enhanced description provides a clearer overview of the multi-sensor's capabilities and applications.

Technical Properties:

  • Physical characteristics
  • Dimensions: 81 x 81 x 30mm
  • Weight: 66g
  • Environmental limits
  • Operating temperature range: -20 to 60°C
  • Operating relative humidity range: 10 to 90% (non-condensing)
  • Recommended operating range is 20% to 80% RH (non-condensing) over –10 °C to 60 °C
  • Prolonged operation beyond these ranges may result in a shift of sensor reading, with slow recovery time
  • Long term drift typical: ±0.25%RH/year, ±0.05°C/year
  • Higher drift might occur due to contaminant environments with vaporized solvents, adhesives, packaging materials, etc.
  • Storage temperature range: -20 to 60°C
  • Storage relative humidity range: 10 to 90% (non-condensing)
  • Ingress protection: IP20
  • Power requirements
  • Operating voltage range (including -15/+20% according to IEC 62368-1): 4.5 to 26VDC
  • Current consumption: 25 mA@5VDC (Peak: 150 mA@5VDC)
  • CO2 measurements
  • Range: 400 to 5000ppm
  • Accuracy: ± (40ppm + 5%)
  • Resolution: 1ppm
  • Calibration: Manual/Automatic
  • Pressure measurements
  • Range: 10 to 1200hPa
  • Accuracy (min): ±1.5hPa (25°C, 750hPa)
  • Accuracy (max): ±2.5hPa (-20°C to + 85°C, 300 to 1100hPa)
  • Resolution: 1hPa
  • Humidity measurements
  • Accuracy (min): ±3.0 %RH (in 20 to 80 %RH range)
  • Accuracy (max): ±5.0 %RH (in 10 to 90 %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
  • Interface
  • Response time ≤ 50ms
  • Master response time-out ≥ Response time + Answer time
  • The answer time depends on the number of bits and the baud rate
  • Warranty
  • Warranty period: 3 years