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Description and application


The sensor of temperature and relative humidity - KSTH 102 is designed to measure the temperature and relative humidity of the air in spaces protected against water. In the application segment of railway vehicles, it is used to measure both of the variables in passenger compartments of train units and carriages and is a part of the temperature and relative humidity control system.

The sensor of temperature and relative humidity - KSTH 102 consists of a plastic ribbing head, where a printed circuit board with the individual sensors and a converter is placed to establish a communication via the RS 485 bus. The temperature and relative humidity are measured by a common internal sensor whose signal is processed in a microprocessor and is converted to an output signal of MODBUS RTU. The sensors meet ingress protection IP 30 according to EN 60 529, as amended. Suitable design and high-quality material ensure that the sensors do not feel disturbing even in the interiors with high aesthetic requirements. You can choose the color of the box white or gray.

The sensor of temperature and relative humidity - KSTH 102 is designed to be operated in a chemically non-aggressive environment; the use must be chosen with regard to the temperature and chemical resistance of the sensor head and of the individual sensors. The operating conditions to establish the correct function are:

- Ambient temperature in the vicinity of the sensor: -40 to 80 °C

- Relative ambient humidity: 0 to 95% (non-condensing humidity)

- Atmospheric pressure: 87 to 106 kPa


  • The type tests are carried out by a notified body according to EN 50 155 standard, as amended Railway applications – Electronic equipment used on rolling stock, Art. 12.2.7, 12.2.8, 12.2.9, 12.2.11

- Art. 12.2.7, 12.2.8 according to EN 50121-3-2 – Electromagnetic compatibility

- Art. 12.2.9 according to EN 50155 – insulation test

- Art. 12.2.11 according to EN 61373 – shock and vibration tests

The material of plastic box and PCB meet a set of requirements for the R 24 materials according to the Table 5 for the fire hazard level HL1-HL2-HL3 of the EN 45545-2:2014 standard. The materials also meet requirements of the NFPA 130 fire safety standard, as amended.

  • Manufacturer provides EU Declaration of Conformity.
  • Calibration – The final metrological inspection – comparison with standards or working instruments – is carried out for all the products. Continuity of the standards and working measuring instruments is ensured within the meaning of the Section 5 of Act no.505/1990 on metrology. The manufacturer offers a possibility to supply the sensors calibrated in SENSIT s.r.o.’s laboratory (according to requirements of the EN ISO/IEC 17025 standard) or in an Accredited laboratory.


  • Specifications
  • Wiring diagram
  • Dimensional draft
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Sensor type KSTH 102
Temperature measurement range -40 °C to 80 °C
Temperature measurement accuracy ± 0,5 °C in the range from 0 °C to 65 °C
± 0,7 °C in the range from 65 °C to 80 °C
± 1,1 °C in the range from -40 °C to 0 °C
Relative humidity measurement range 0 to 95 %
Relative humidity measurement accuracy ± 3 % in the range from 10 to 90 %
± 4,5 % in the range from 0 to 10 % and 90 to 95 %
Output signal RS 485 / MODBUS RTU
Supply voltage U 15 to 30 VDC
Rated supply voltage Un 24 VDC
Consumption maximum: 500 mW
typical: 250 mW
Ingress protection IP 30 in accordance with EN 60529
Dimension of the head 71,9 x 59 x 27 mm
Material of the head LEXAN (meets standard EN 45545-2)
Weight min 35 g
Recommended wire cross section 0.14 to 1 mm2


Shock and vibration tests

category 1, class B in accordance with EN 61373
Elektromagnetic compatibility in accordance with EN 50121-3-2
Insulation test 1.5 kVDC for time 1 minute in accordance with EN 50155
Fire protection resistance
in accordance with EN 45545 (possible acc. to NFPA 130)

Note: Manufacturer reserves the right to make changes in design and technical characteristics of the products. For actual information, please always contact your dealer.

temperature sensor KSTH 102
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