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Description and application


Resistance temperature sensors are designed for contact temperature measurement of liquid and gaseous substances. They operate on the principle of dependency of the change of resistance of the sensor and the change of temperature. Resistance temperature sensors are not able to create sparks, electric arcs or high surface temperatures and the maximum permitted DC input power for the sensor is 2mW. The standard temperature range for using of the sensor in ZONE 2 is - 30°C to 80°C, which corresponds to temperature class T6, and it must not be exceeded even for a brief period in areas with the risk of explosion. The stem design allows the use of sensors for direct temperature measurement in pipelines and at the same time it provides a fast sensor response to changes in temperature compared to sensors with a thermowell.

The sensors are designed to be operated in a chemically non-aggressive environment, the use must be chosen with regard to temperature resistance of the head and chemical resistance of the case and head of the sensor.


  • EC Declaration of Conformity – in accordance with Act 22/1997 Coll. on technical requirements on products as amended.
  • 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
Sensor type NK 160EX NK 161EX NK 162EX
Type of sensing element Ni 1000/5000 Ni 1000/6180 Ni 891
Measuring range in ZONE 2
-30 °C to 80 °C
Max. DC measuring current 1 mA 1 mA 1 mA

Sensor type PTK 160EX PTK 260EX PTK 360EX HK 160EX
Type of sensing element Pt 100/3850 Pt 500/3850 Pt 1000/3850 termistor NTC 20 kΩ
Measuring range in ZONE 2
-30 °C to 80 °C
Max. DC measuring current 3 mA 1.5 mA 1 mA 1 mW *)

*) maximum power consumption

Measuring range In ZONE 2 -30 °C ≤ Ta ≤ 80 °C
Sensing element connection 2wire, 3wire, 4wire
Recommended power supply from a PELV or SELV source
maximum input power 2mW
Time response in accordance with EN 60 751 (in flowing water > 0,2 m/s),
- for case diameter 4 mm: τ0,5 ≤ 4 s, τ0,9 ≤ 10 s
Insulation resistance > 200 MΩ at 500 V DC, 25 °C ±3 °C and humidity < 80 %
Electric strength 1000 V DC po dobu 1 s, 25 °C ± 5°C, humidity < 80 %
Ingress protection
IP 66 in accordance with EN 60 529
Terminal board type Ceramic, recommended cross-section of the wires 0.5 to 1.0 mm2
Material of the connection head aluminum
Dimension of the connection head 83 x 83 mm
Temperature resistance of the head -30 °C to 90 °C
Material of the stem stainless steel DIN 1.4301, 1.4404 nebo 1.4571
Diameter x wall thinkness of the stem 4x0,3 mm; 6x0,5 mm; 6x1 mm; 8x1 mm; 10x1 mm; 10x1,5 mm
Standard length of stem L diameter 4 mm: 50, 100, 160, 220 mm
other diameters: 50, 100, 160, 220, 280, 340 and 400 mm
Standard thread type
G ½“ and M20x1,5
Wire resistance 0,254 Ω / m (two-wire connection)
Maximum operating pressure with stem diameter 4 mm - 2,5 MPa
with stem diameter 6 to 10 mm - 6,3 MPa
Weight min 0.4 kg

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

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