1. Short description TSM400-4-CPTH is a multi-sensor that supports MODBUS RTU protocol over the RS-485 interface. The sensor measures CO2 concentration, temperature, humidity, and barometric pressure. The MODBUS device integrates an advanced non-dispersive infrared sensing element (NDIR) for CO2 measurements. The measurement principle is based on the absorption of infra-red (IR) light with specific wavelengths by CO2 molecules.
• • • 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.
Attention: For proper operation of the interface, terminators (120 ohms resistors) must be installed at both ends of the bus. The device has a built-in 120-ohm resistor and to terminate the line, “B-“ and “TERM” must be shortened. A daisy-chained (linear) topology for multiple sensors should be used. UTP/FTP cables are mandatory for interconnection. 7. Installation tips The location and the mounting position of the sensor have a direct effect on the accuracy of the measurement.
8. Status indicator The status of the device is shown by a single LED, located inside the box: • If the LED blinks for a period of 1 second, the sensor works properly; • If the LED blinks for a period of 3 seconds, there isn‘t communication with the controller; • If LED doesn‘t blink, there isn‘t a power supply. 9. Factory default settings Disconnect the sensor from the bus (switch off the power supply). Press and hold the “config” button.
Dew point °C R 3 204 40205 40001 32-bit float CO2, ppm R 3 206 40207 40001 32-bit float Pressure, mmHg R 3 208 40209 40001 32-bit float Temperature °F R 3 400 40401 40001 32-bit float Humidity %RH R 3 402 40403 40001 32-bit float Dew point °F R 3 404 40405 40001 32-bit float CO2, ppm R 3 406 40407 40001 32-bit float Pressure, hPa R 3 408 40409 40001 32-bit float Temperature °F R 3 500 40501 40001 32-bit float Humidity %RH R 3 502 40503 4000
