Mineral insulated resistance thermometer with a metal protection tube

Mineral insulated resistance thermometers with a metal protection tube (50-WMS) are used for general temperature measurement, mostly in liquid and gaseous media at temperatures up to 600°C, on rare occasions up to 800°C.  Typical applications include refrigeration and air conditioning technology, heating, oven and apparatus construction, as well as chemical industry.

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This series industrial temperature sensors are available in various protection tube diameters and can be assembled with a reduced tip, depending on the desired robustness or response time. An advantage of sensors with a replaceable measuring insert is that only the inserts have to be exchanged when in need of replacement, without draining or taking the pressure off the process.

Different insert lengths can be created by applying a process connection like a compression fitting or a mounting flange. This way, a neck tube can also be created that will stick out above the insulation. When using a neck tube, the temperature irradiation to the connection head will be limited and this will also avoid condensation forming in the connection head. These things can be important when using transmitters.

Protective fittings in this product line consist of seam welded or seamlessly drawn metal tubes. The tips for the protective tubes are either closed through hot forming or welded shut with a bottom blank.

For prolonging the holding time, strengthening the wall thickness and utilization of ceramic inner tubing are possible.

All internationally prevalent precision resistors, detachable process connectors (for example mobile flanges or threaded sleeves) and connection heads are used.

Depending on the connection type (2-wire, 3-wire or 4-wire – in turn depending on the required measurement precision and connector length), resistance thermometers consist of 2, 4 or 6 feed lines (inner conductors), surrounded by a thin metallic protective mantle, usually made of high-grade steel.  The inner conductors are firmly press-fitted and insulated in ceramic powder. The precision resistor inside the sensor tip is connected through the inner conductors.

The gauge slide in serial-production is fitted with a Pt100 temperature sensor pursuant to DIN 60751, however versions with Pt500 or Pt1000 sensors are possible. The gauge slide is hermetically sealed.

For specialised applications (precision, long-term stability, etc.) we recommend the application of precision resistors with narrowed tolerance.

The resistance values and tolerances of our resistance thermometers are pursuant to DIN EN 60751.

Due to their structure, protected resistance thermometers offer a number of advantages when compared to regular thermocouple assemblies:

  • Small physical dimensions with maximum flexibility for temperature measurement at sites with difficult accessibility (diameter 1,5 – 6,0 mm).
  • Short response time for exact measurements of temperature variations
  • Optimal protection for the sensor system by the enclosed structure

Application areas of our Mineral insulated resistance thermometers with a metal protection tube (50-WMS):

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Langkamp Technology B.V.
22 Molenvliet
3961 MV Wijk bij Duurstede

Phone: +31 (0)343-595410