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Description and application


TSDD switches are built as two-state regulators (on/off regulation), which compare the set and immediate temperature and enable switching galvanically isolated relay contacts when the set temperature value is reached. The sensors consists of a plastic connection head with the transparent lid. In the connection head is located electronic equipment with LED display. The switches meet the IP 65 ingress protection requirements according to the EN 60 529 standard. Easy mounting of the switches is ensured by the unique “S head” design invented by SENSIT s.r.o.

Regarding sensing element location and switch application the following versions are available:

  • TSDD A – temperature switch for sensing temperature in the switch ambient. The sensing element is placed in the metal stem.TSDD P – contact version switch for fixing on pipeline surfaces for surface temperature measurements. The sensing element is housed in a measuring case made of metal. It is delivered with the fastening strap of the length 40 cm and with closure device.
  • TSDD K – the sensing element is placed in the metal stem for use in air condition equipment or in tubings. This temperature switch version is available with a plastic mounting clip. Stainless steel thermowell or metal holder can be delivered as an acsessory.
  • TSDD C – the sensing element is protected by the TG 8 case, 40 mm long, and provided with a cable 1 m long. Another case type or another cable length should be specified in the order.

Standard temperature ranges, in which the temperature set point can be adjusted, are given in the specifications table. For the TSDD A the maximum allowable operation temperature is 70 °C, for the TSDD P this temperature limit is 110 °C. For applications above 140 °C the TSDD K may be used. However, in this case the switch version with the stem elongated by 60 mm and the metal centric fixing clip must be used.

These switches are designed to be used in a chemically non-aggressive environment.



  • 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) or in an Accredited laboratory.  


  • Specifications
  • Wiring diagram
  • Dimensional draft
  • Download

Type of sensing element
Pt 1000/3850
Out put 1 switch relay
Power supply 12 or 24 V DC
Maximum switched voltage / current 30 V DC / 5 A
Measuring range -50 to 300 °C
Hysteresi 1 to 15 °C
Elestronics equipment error ± (0.2 % of values + 1 dig)
Accuracy class of Pt sensor class B according to EN 60 751, Δt = ± (0.3 + 0.005|t|) in °C
Connection head dimension 70 x 63 x 34 mm
Material of the connection head POLYAMIDE
Ingress protection IP 65 in accordance with EN 60 529
ambient temperature around the connection head
-30 to 70 °C
Recommended wire cross section 0.2 to 1 mm2
Insulation resistance > 200 MΩ st 500 V DC, 25 ± 3 °C

Standard length of the stem L1 50 mm
Diametr of the stem 6 + 0.2 mm
Material of the stem stainless steel DIN 1.4301
Measuring range
-25 to 70 °C

Standard length of the stem L1 70, 120, 180, 240 mm
Diametr of the stem 6 + 0.2 mm
Material of the stem stainless steel DIN 1.4301
Switch installation by means of the plastic stainless steel
holder or stainless steel thermowell
Measuring range
-50 to 200 °C (using an elongated stem above 140 °C)

Material of measuring case
Material of protection case
Maximum measuring temperature range
-30 to 130 °C
Ambient temperature around connection head
-30 to 80 °C
Switch installation
by means of fastening band withclosure
Standard length of the tape
40 cm
Minimum diametr of tubing
20 mm

Standard type of sensor
TG8 - 40, cable 1 m
Diametr of the case
5.7 ± 0.1 mm
Material of the case
stainless steel DIN 1.4301
Lead-in cable
shielded silicone 2 x 0.34 mm2
Sensor ingress protection
IP 67 in accordance with EN 60 529
Maximum range of measured temperature
-50 to 300 °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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