Current research projects

Image Certification of efficient air conditioning and ventilation systems through the new "indoor air quality seal" for non-residential buildings
Image Preformance measurements of heat exchangers
Image Mass Spectrometer
Image 3D - Air flow sensor
Image Calibration of Low Temperature Sensors
Image Innovative cryogenic cooling system for the recondensation / liquefaction of technical gases up to 77 K
Image Development of test methods and test rigs for stationary integrated refrigeration units
Image Hydrogen and methane testing field at the ILK
Image Lifetime prediction of hermetic compressor systems
Image Low Temperature Measuring Service
Image Industry 4.0 membrane heat and mass exchanger (i-MWÜ4.0)
Image Measurements on ceiling mounted cooling systems
Image Air-flow test rig for fan characteristic measurement
Image Brine (water)-water heat pump
Image Development of a Cryogenic Magnetic Air Separation Unit
Image Cryogenic liquid piston pumps for cold liquefied gases like LIN, LOX, LHe, LH2, LNG, LAr

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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 - Research and Development

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Reducing the filling quantity

How much refrigerant must be filled?

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Performance tests of condensing units

Does your condensing unit perform well?

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State of system and failure analyses

Cause of the failure unknown?

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Thermostatic Expansion Valves

Does the TXV function correctly?