TSM400-4-TH_R1.2 –March 2023 Page 2
1. Short description
TSM400-4-TH is a humidity and temperature sensor that supports MODBUS RTU protocol over the RS-
485 interface. 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-TH 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;
•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
•Server room and data centers humidity and temperature monitoring
•Smart ventilation systems
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: 10 to 90% (non-condensing) *
Long term drift typical: ±0.25 %RH/year, ±0.05 °C /year **
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 26 VDC
Current consumption: 10 mA@5VDC
•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
