PT thermal sensors

PT sensors (platinum resistors) are PTC thermistors and belong to the group of PTC (positive temperature coefficient) sensors. They are predominantly used for taking temperature measurements with maximum accuracy, as their resistance has a virtually linear correlation with a rise in temperature. PT sensors are protected from both chemical and mechanical influences on account of their platinum coating, subsequent embedding and, in some cases, even their adaptation to specific applications.

Platinum sensors with a high rated resistance (such as PT1000) or 4-wire technology would be the ideal choice when using long connection cables.

eaw Relaistechnik offers the installation of NTC, PTC, KTY, PT100, PT500 or PT1000 thermistors within our trusted housing range for the ½-inch thermal switch series. With this solution, you have the option to replace traditional bimetallic thermostats with temperature sensors featuring NTC or PTC elements as thermistors immediately without having to change the design of your tools or your construction documentation.


Material and temperature ranges

  • Platinum (PT) resistance
  • Standardised in line with EN 60751 for use within a temperature range of
    -60°C to 390°C

The practical applications and temperature range are generally closely restricted and specified in the corresponding data sheet.

Platinum temperature sensors have been standardised with the ‘PT’ symbol and a rated resistance of R0 for a temperature of 0°C.

  • PT100          R0 = 100 Ω
  • PT500          R0 = 500 Ω
  • PT1000        R0 = 1000 Ω

When connecting the PT1000, it is recommended to use long connection cables with a lower distorting influence on the conductor resistance when the rated resistance is high.