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This temperature sensor SD 122 with a stem and plastic head with a digital output RS 485 / MODBUS RTU is designed for contact temperature measurement of liquid and gaseous substances. In combination with a central holder, the sensor is suitable for temperature measurement in air conditioning ducts. The combination of a sensor and a thermowell is suitable for direct measurement of the medium in pipelines. The temperature sensor is easy to install thanks to the unique “S-head” design of the SENSIT s.r.o. company.

The sensors consist of a plastic head and a metal case, where the sensing element for temperature measurement (sensor) is placed. In the head, there is a terminal block with a converter located, to which a supply cable for sensor supply and digital output signal according to the sensor type is connected through a cable grommet or a connector.

SD 122, SD 122K – MODBUS/RTU communication protocol, communication via the RS485 bus

The temperature range of sensor use is defi ned in the table of technical parameters for the individual versions of sensors. The sensors meet the ingress protection of IP 65 according to EN 60529, as amended.

The sensors are 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.


  • plastic holder (supplied in the package)
  • stainless steel thermowell JS 130
  • K 120 metal holder
  • CONEC 43-00092 connection plug
  • connection cables with a straight RKT connector or a right-angled RKWT connector
  • fitting with a collet or with cutting rings – for setting of diff erent immersion lengths of the temperature sensor stem


  • Manufacturer provides EU Declaration of Conformity.
  • Calibration – The entire production passes through a fi nal metrological inspection, which is carried out by comparing with standards or working measuring instruments. Continuity of the standards and working measuring instruments is ensured within the meaning of Section 5 of Act No. 505/1990 on Metrology. The manufacturer off ers to supply the sensors calibrated in the SENSIT s.r.o. laboratory (according to requirements of the EN ISO/IEC 17025 standard, as amended) or in an accredited laboratory.


Sensor type
(K - with connector)
SD 122
SD 122K
Output signalRS 485 / MODBUS RTU
Measuring range *)-50 to 150 °C
Accuracy of the electronics± 0.2 °C
Type / Accuracy of the sensing elementPt 1000 / ± (0.3 °C + 0.0005|t|)
Supply voltage (U)15 to 30 V DC
Rated supply voltage (Un)24 V DC
Consumption / Supply currentmaximum: 500 mW
typical: 300 mW
Working conditionsambient temperature: -30 to 100 °C
relative air humidity: max. 100 %
atmospheric pressure: 70 to 107 kPa
Ingress protectionIP 65 in accordance with EN 60529, as amended
Time responseτ0.5 < 9 s (0.2 m/s-1 in running water)
Standard stem lengths70, 120, 180, 240 mm
Standard stem diameter6 ± 0.2 mm
Material of the stemstainless steel DIN 1.4301
Resistance to pressure
(impact on the stem with the medium)
PN 25 (without thermowell) / PN 63 (with thermowell)
Insulation resistance> 200 MΩ at 500 V/DC, 25°C ± 3 °C; humidity < 85 %
Dimensions of the connection head70 × 63 × 34 mm
Material of the connection headPOLYAMIDE
Connector type in the head
(for sensors with a connector)
RSFM4 - M12- Lumberg
Recommended wire cross-section
(for sensors with a grommet)
0.14 to 1 mm2
Weightmin. 170 g

*) By extending the stem length by 60 mm, the Sd 122, SD 122K, SD 124 and SD 124K sensors can be used up to 200 °C.

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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