In production :  3 to 5 weeks

Sensor type

(K - with connector) KSD 122

KSD 122K

RS 485 / MODBUS RTU output signal

Measuring range *) -50 to 150 ° C

Electronics accuracy ± 0,2 ° C

Type / Accuracy of the sensitive element Pt 1000 / ± (0,3 ° C + 0,0005 | t |)

Supply voltage (U) 15 to 30 V DC

Nominal supply voltage (Un) 24 V DC

Maximum power consumption / current: 500 mW

typical: 300 mW

Protection index IP 65 according to EN 60529, as amended

Response time τ0,5 <9 s (0,2 m / s-1 in running water)

Standard rod lengths 70, 120, 180, 240 mm

Standard shank diameter 6 ± 0,2 mm

Rod material stainless steel DIN 1.4301

Pressure resistance

(impact on the rod with the fluid) PN 25 (without thermowell) / PN 63 (with thermowell)

Insulation resistance> 200 MOhm at 500 V / DC, 25 ° C ± 3 ° C; humidity <85%

Connection head dimensions 70 × 63 × 34 mm

LEXAN connection head material (in accordance with EN 45545-2)

Connector type in the head

(for sensors with connector) RSFM4 - M12- Lumberg

Recommended wire section

(for sensors with cable gland) 0,14 to 1 mm2

Working conditions ambient temperature: -40 to 80 ° C

relative air humidity: max. 100%

atmospheric pressure: 70 to 107 kPa


min. 170 grams

*) The measurement error of the KSD 122A temperature sensor depends on the flow rate and the supply voltage (method error) and can be between -1,0 and 1,5 ° C.


Shock and vibration tests

category 1, class B according to EN 61373

Electromagnetic compatibility according to EN 50121-3-2

Insulation test 1,5 kVDC for 1 minute according to EN 50155

Fire resistance

according to EN 45545 (possible according to NFPA 130)


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This KSD 122 temperature sensor with a plastic rod and head with RS 485 / MODBUS RTU digital output is designed for measuring the temperature of liquid or gaseous substances. In the application segment of rail vehicles, it is used, for example, to measure the temperature of the outside air under the vehicle floor. For this, the sensor is equipped with a rod with high mechanical resistance.

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

KSD 122, KSD 122K - MODBUS / RTU communication protocol, communication via RS485 bus

The temperature range of use of the sensors is defined in the table of technical parameters for the different versions of the sensors. The sensors meet the protection index IP 65 according to standard EN 60529, as amended.

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


plastic holder (supplied in the package)

JS 130 stainless steel thermowell

Metal support K 120

CONEC connection plug 43-00092

connection cables with straight RKT connector or angled RKWT connector

mounting with pliers or with cutting rings - for setting different immersion lengths of the temperature sensor rod


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

- Electromagnetic compatibility according to EN 50121-3-2, as amended

- Insulation test according to EN 50155, as amended

- Shock and vibration tests according to EN 61373, as amended

The product meets the parameters in accordance with EN 45545-2, as amended, Fire protection of railway vehicles - Part 2: Requirements for the fire behavior of materials and components. May be supplied with materials that meet NFPA 130 fire safety standard, as amended.

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