TERACOM TSM400-4-CPTH CO2 Humidity and Temperature Multi Sensor User Manual

TERACOM TSM400-4-CPTH CO2 Humidity and Temperature Multi Sensor User

Manual

TSM400-4-CPTH
CO , humidity, and temperature multi-sensor
Version 1.0 / August 2022

www.teracomsystems.com

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. The carbon dioxide sensing 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 element for barometric pressure is factory calibrated and it does not require any lifetime recalibration. A unique capacitive element is used for measuring relative Humidity while the temperature is measured by a band gap sensor. Both sensors are seamlessly coupled to a 12-bit analog to digital-converter. This results in superior signal quality.

The TSM400-4-CPTH multi-sensor is housed in a slim plastic enclosure. The bottom part of the enclosure is suitable for installation on standard flush- mounted/cavity wall boxes ø68mm, with installation openings on 61 mm.

2. Features

• LED indicator for status of communication;
• Long-term stability based on digital signal processing;
• Self-calibration on fresh air for CO2 measurements;
• RS-485 interface carrying up to 32 nodes;
• Changeable bitrate and other communication parameters;
• Firmware update via the interface.

3. Applications

• Environmental quality monitoring and assessment for offices
• CO2 pollution monitoring
• Server room and data centers humidity and temperature monitoring
• Smart ventilation systems
• CO2, humidity, and temperature monitoring in building management systems (BMS)

4. 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
  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.

• 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

5. Pinout

6. Installation

Two-Wire MODBUS definition according to modbus.org:
“A MODBUS solution over a serial line should implement a “Two-Wire” electrical interface in accordance with EIA/TIA-485 standard. On such a “Two-Wire” topology, at any time one driver only has the right for transmitting. In fact, a third conductor must also interconnect all the devices of the bus – the common.”

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. The tips below will ensure good measuring results:

• Sensor shall be installed about 1.2-1.4 m above the floor;

• To avoid solar radiation, the sensor should not be installed next to windows or directly in
  the sunlight;

• Sensors shall be installed in a place with sufficient air circulation.

TSM400-4-CPTH sensor is intended for installation on a cavity wall box with 68mm diameter and 61 mm screw spacing.

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. Don’t release the button, connecting the sensor to the bus (switch on the power supply).

The “status” LED will be ON for 3 seconds and after this will flash for 7 seconds. After the 10-th second the LED will be ON.

Release the button. The sensor will restart with factory default settings.

10. Firmware update

The firmware of the sensor can be updated with a Teracom controller which supports
MODBUS RTU or MBRTU-Config software. For more details ask your dealer.

11. Modbus address table

MSWF – Most significant word first – (bits 31 … 16), (bits 15 … 0); LSWF – Least significant word first – (bits 15 … 0), (bits 31 … 16); PDU address – Actual address bytes used in a Modbus Protocol Data unit

A “NaN” value is returned for unavailable floating-point values (e.g. in case of measurement error)

• The settings will take effect after restarting the device by power off, power on.

12. Recycling

Recycle all applicable material.
Do not dispose of with regular household refuse.

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References

• The Modbus Organization
• Remote monitoring and control solution for your automation challenges

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