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KNS 500

Description and application

KNS 500

The KNS 500 temperature sensor is designed to measure temperature of gaseous substances in spaces protected against water. In the application segment of Railway Vehicles, it is used to measure temperature in passenger compartments of train units and carriages and is a part of the temperature control system.

The temperature sensor consists of a plastic ribbing head, where a printed circuit board with a temperature–current converter and a resistance temperature sensor is placed. The sensors can be used for any control systems compatible with the current output of 4 to 20 mA. Standard temperature ranges of the sensor are shown in the table of technical parameters, while the maximum temperature around the sensor head is 80 °C. The sensor meets ingress protection IP 30 according to EN 60529. 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 is intended for operation in chemically non-aggressive environment.


  • The type tests are carried out by a notified body according to EN 50155 standard, as amended, Railway applications – Electronic equipment used on rolling stock, Art. 12.2.9, 12.2.11

- Electromagnetic Compatibility in accordance with EN 50121-3-2 standard, as amended

- Insulation test in accordance with EN 50155, as amended

- Shock and vibration tests in accordance with EN 61373, as amended

The product meets parameters in accordance with EN 45545-2, as amended, Fire protection on railway vehicles - Part 2: Requirements for fire behavior of materials and components. Can be supplied with materials complying with fire safety standard NFPA 130, 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, as amended) or in an Accredited laboratory.


  • Specifications
  • Modification
  • Wiring diagram
  • Dimensional draft
  • Download
Typ snímače KNS 500
Output signal 4 to 20 mA
Standard ranges of measurement**)
-30 °C to 60 °C
0 °C to 100 °C
0 °C to 150 °C
0 °C to 200 °C
Supply voltage U 12 to 30 VDC
Rated supply voltage Un 12 VDC
Output signal when the sensor is interrupted > 23 mA
Output signal when the sensor is short-circuited < 3.5 mA
Measurement error in dependence
to supply voltage for the flow rate
from 0 to 0.4 m/s
in range 0 to 40 °C
UNS = 12V: ± (0.5 °C)
UNS = 24V: (-0.2 to 0.80 °C)
in range -30 °C to 80 °C
UNS = 12V: ±(0.5 °C) ± 0.2 % from range
UNS = 24V: (-0.2 to 0.80 °C) ± 0.2% from range
Ambient temperature -40 °C to 80 °C
Material of the head LEXAN (meets standard EN 45545-2)
Dimensions of the head 71.9 x 59 x 27 mm
Ingress protection IP 30 in accordance with EN 60529
Response time τ0,5 ≤ 8 s (in flowing air at 1 ms-1)
Mean working life ≈ MTTF*) 1.2 x 105 hrs - based on a theoretical calculation

*) Under the environmental and operational conditions specified in approved testing methodology.

**) see modifications


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.

- zakázkový měřící rozsah v rozmězí -40 °C do 150 °C, přičemž minimální rozpětí rozsahu je 35 °C

Datasheet - Temperature sensor KNS 500
Datasheet - Temperature sensor KNS 500Datasheet - Temperature sensor KNS 500
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