Current research projects

Image 3D - Air flow sensor
Image Pulse-Tube-Refrigerator with sealed compressor
Image Air-water heat pumps
Image Low temperature – test facilities
Image Service offer for Leak Detection and Tightness Test
Image Tensile and compression testing
Image Test rigs for refrigeration and heat pump technology
Image Panel with indirect evaporative cooling via membrane
Image Range of services laboratory analyses
Image Development of test methods and test rigs for stationary integrated refrigeration units
Image Production of novel barrier layers on polymer materials to reduce hydrogen permeation
Image Corrosion inhibitor for ammonia absorption systems
Image Low noise and non metallic liquid-helium cryostat
Image Breakthrough Sensor for Adsorption Filters (BelA)
Image Calibration of Low Temperature Sensors
Image Reduction of primary noise sources of fans

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Calibration of Low Temperature Sensors

Industry and R&D

Dr. rer. nat. Matthias Schneider

+49-351-4081-5126

According to the comparative measurement method

Accurate and reliable measurements are the requirements for high-quality research and development or industrial production. Using the comparative measurement method the following sensors can be calibrated:

  • Resistance Temperature Detectors (RTD) with positive temperature coefficient (like Platinum or Rhodium-Iron RTDs)
  • RTD with negative temperature coefficient (like Germanium or Cernox™ RTDs)
  • Diode and thermocouples.

With an automatic measuring station several temperatures according to a sample point table will be adjusted. The calibration is carried out with secondary thermometers that are calibrated by an authority. Furthermore a fix point check with LHe or LN2 will be performed. In addition, a calbriated Cernox sensor is available for measurements in the low temperature range. The measuring facility allows the calibration of about 30 sensors at once. There are continuous extensions for different sensor types.

Parameter

IndicatorMinimalMaximal
Measuring range1.5 K350 K
Measuring accuracy5 mK (1.5 ... 4.2 K)50 mK (80 ... 350 K)
Sample dimensioncommon sensor packages
Sample preparationnot necessary

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Further Projects

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Influenced melting point of water by magnetic field

Controlled sub-cooling of products in freezing processes

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Investigation of materials

Investigations regarding the compatibility of materials with refrigerants, oils and heat transfer fluids

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Non- invasive flow measurements

PDPA - flow fields and particle sizes