sensortec AG - Room Sensor EL-THCV-MB

Use cases

• Monitor room temperature and relative humidity on a live cloud dashboard for multiple zones in a building.
• Track CO2 concentration over time and create alerts when levels exceed recommended thresholds for occupied spaces.
• Log TVOC readings to identify indoor air quality issues and provide data reports to building owners.
• Compare indoor climate data across rooms to optimize HVAC setpoints and reduce energy consumption.
• Set up an alert when temperature drops below or rises above a configurable comfort range for more than 15 minutes.
• Remotely verify sensor health and adjust the temperature offset without visiting the site.

Installation

1. 1Wire the sensortec AG room sensor to a 24 VDC or 24 VAC power supply and connect the RS485 A and B lines to the Modbus gateway (MCG or MLP series).
2. 2Set the Modbus base address on the sensor according to the sensortec AG documentation, ensuring no address conflicts with other devices on the bus.
3. 3Configure the Modbus gateway serial port to use Modbus RTU at 38400 baud with the correct parity and stop bit settings (refer to the sensor datasheet for defaults).
4. 4Import the sensortec AG EL-THCV-MB template from the ModbusCloud template library into your project.
5. 5Assign the template to the correct gateway port and enter the configured Modbus slave address.
6. 6Verify that live readings for temperature and humidity appear on the dashboard, then confirm CO2 and TVOC values if you are using a THC, THV, or THCV variant.

Things to watch for

01

Why do CO2 or TVOC readings show zero or no data?

Available registers depend on the product variant. TH models do not have CO2 or TVOC sensors. Verify your order number to confirm which measurements your specific model supports.

02

The gateway cannot communicate with the sensor. What should I check?

Confirm the baud rate is set to 38400 on both the sensor and the gateway. Check that the RS485 A and B wires are not swapped, and verify the configured Modbus slave address matches on both sides.

03

Can I connect multiple sensortec room sensors on one RS485 bus?

Yes. Each sensor must have a unique Modbus base address. Use the sensor configuration to assign distinct addresses before connecting them to the same bus.

04

How do I apply a temperature offset for calibration?

The template includes a writable register for temperature offset. You can adjust this value from the ModbusCloud platform or set it directly on the device during commissioning.

Registers (7)

4 read / 3 write

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