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Temperature sensor - Plastic connection head - DS18B20

Delivery in 3 to 5 weeks
  • DS18B20 temperature sensor.
  • Plastic stem and head with digital output.
  • Measures the contact temperature of liquid and gaseous substances.
  • Easy to install thanks to the “S-head” design.

Product features Temperature sensor - Plastic connection head - DS18B20

Probe with plastic connection box


This SD 125 temperature sensor with plastic rod and head with digital output is designed for measuring the contact temperature of liquid and gaseous substances. In combination with a central support, the sensor is suitable for temperature measurement in air conditioning ducts. The combination of sensor and thermowell is suitable for direct measurement of the medium in pipes. The temperature sensor is easy to install thanks to the unique “S-head” design.

The sensors consist of a plastic head and a metal housing, where the detection element for temperature measurement (sensor) is placed. In the head there is a terminal block with a converter to which the sensor is connected via a cable gland or a connector.

SD 125 - DS 18B20 digital temperature sensor, communication via 1-Wire bus

The operating temperature range of the sensors is defined in the table of technical parameters of the different versions of sensors. Sensors respond to ingress protection IP 65 according to EN 60529, as amended.

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


  • CONEC 43-00092 input connector
  • connection cable with straight connector RKT or with rectangular connector RKWT
  • screw with collar or cutting rings - if different immersion lengths of the temperature sensor are set


  • The manufacturer provides an EU declaration of conformity.
  • Calibration - The final metrological control - comparison with standards or working instruments - is carried out for all products. The continuity of standards and work measurement instruments is ensured within the meaning of article 5 of Law No. 505/1990 on metrology. The manufacturer offers the possibility of supplying the calibrated sensors in the laboratory (according to the requirements of EN ISO / IEC 17025) or in an accredited laboratory.  
Sensor type SD 125
Output signal 1 wire / DS18B20
Measuring range -40 to 125 ° C
Electronics accuracy ± 0,2 ° C
Type / precision of the sensitive element ± 0,5 ° C in the range of -10 to 80 ° C
  ± 2 ° C in the range of -30 to 100 ° C
Supply voltage (U) 3 to 5,5 V DC
Nominal supply voltage (Un) 5 V DC
Power consumption / current 1 mA
Working conditions ambient temperature: -30 to 100 ° C
  relative air humidity: max. 100%
  atmospheric pressure: 70 to 107 kPa
Protection against ingress IP 65 according to EN 60529, as modified
Response time τ0,5 <9 s (0,2 m / s-1 in running water)
Standard rod lengths 70, 120, 180, 240 mm
Standard rod diameter 6 ± 0,2 mm
Material of the stem DIN 1.4301 stainless steel
Pressure resistance PN 25 (without thermowell) / PN 63 (with thermowell)
(impact on the stem with the medium)  
Insulation resistance > 200 MΩ at 500 V / DC, 25 ° C ± 3 ° C; humidity <85%
Connection head dimensions 70x63x34mm
Connection head material POLYAMIDE
Connector type in the head RSFM4 - M12 - Lumberg
(for sensors with a connector)  
Recommended cable section 0,35 to 1,5 mm 2
(for sensors with grommet)  
Weight min. 120 g



Before connecting the power cable, pry off the plastic connection head cover using a flat screwdriver. The input cable is connected to the terminals according to the wiring diagram through the loose eyelet. The recommended wire section is 0,35 to 1,5 mm2. The diameter of the circular section cable can range from 4 to 8 mm. To ensure the IP 65 protection value, the grommet must be tight and the cover must be put on after the input cable has been connected.


The input cable with connector is connected to the RSFM4 connector, which is part of the sensor head. Optionally the autonomous CONEC connector 43-00092, or an input cable with a length of 5 m equipped with a straight RKT connector, or a rectangular type RKWT connector can be delivered. To guarantee the protection value IP 65 , the connectors and the sensor cover must be tightened and checked.

If the input cable is laid near high voltage conductors or those supplying equipment creating a disturbing electromagnetic field (eg equipment with an inductive load), shielded cable must be used. If a stainless steel thermowell or stainless steel bracket is used, these

accessories should be placed first where the temperature will be measured. Then the sensor is inserted into the holder or pushed as far down the thermowell, and tightened with a screw. The openings for the installation of the plastic clamp must be drilled in accordance with the sketch dimensions on which the diameters of the openings and the distances from their centers are illustrated.

After installing and connecting the sensor to the sequential evaluation electrical equipment, the sensor is ready for use. The sensor does not require any special servicing or maintenance. The device can be used in any working position, but the eyelet must not be pointing upwards.



  • Possibility of coating two sensitive elements
  • Accuracy class A (except Ni 10000/5000, Ni 10000/6180, T1 = Ni 2226, 20 kΩ NTC resistor)
  • Three or four wire connection option
  • Variable rod - Length L1, materials, diameters, possibility of threading
  • Thermowell Thread Type Options
  • Ability to provide custom temperature ranges for temperature sensors with converter

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