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Heraeus MR Series RTD Sensor Elements

Heraeus MR 828 series temperature sensors are basically thin-film platinum RTD elements housed within a round ceramic body.  This circular design can aid sensor assembly and can eliminate the need for further filling materials normally required when fitting thin-film elements into metal probe housings.  The round format also means these Pt100 (or Pt1000) elements are non-directional when used in airflow sensing or other similar applications.

It is also possible to have two platinum sensing elements built into these ceramic tubes (known as a “duplex” version) to enable users to have separate temperature control and monitoring circuits where necessary.  The twin element design can also offer built-in element redundancy when required.

There are two probe diameters available MR828 (2.8mm) and MR845 (4.5mm) respectively with Pt100, Pt500 and Pt1000 options depending on the size of the ceramic probe chosen.  The duplex versions are only presently available with Pt100 and Pt1000 sensing elements.


  • Industrial temperature sensors
  • Laboratory equipment
  • Medical appliance equipment


  • Temperature Range from -70°C to +500°C
  • Temperature Coefficient (TCR) typically 3850 ppm
  • Round ceramic housing; 2.8mm or 4.5mm diameter
  • Alternative design to wire-wound elements
Pt100, Pt500, Pt1000 Platinum Sensor Elements in ceramic body Dimensions of Heraeus MR ceramic element from ATC Semitec

Technical Specifications

Product Dimensions in mm Ptxxx (Ohms at 0°C) Temperature Range
MR828 8.0 x 2.8 diameter Pt100/Pt1000 -70°C to +500°C Data Sheet
MR845 8.0 x 4.5 diameter Pt500/Pt1000 -70°C to +500°C Data Sheet