Contact (DTU Risø campus)


Frederiksborgvej 399

Bygning 201

DK-4000 Roskilde



Mogens Kirkegaard
+45 2023 5431

Finn Eliasen
+45 2023 5431


Contact (Hørsholm)


Kogle Allé 5

DK-2970 Hørsholm

Tlf: +45 77305800


CVR/VAT#: DK29217939

Lisa C. DeLeebeeck
+45 25459036


For over 50 years the Thermometry Laboratory has calibrated equipment for temperature measurements, at first for experimental setups at the Risø research facility, later for the pharmaceutical, food, and other industries. Since its accreditation in 1978 the Thermometry Laboratory has been among the leading suppliers of accredited calibration services within contact thermometry in Denmark.

On March 1st, 2018, DFM acquired the laboratory at DTU Risø. The activities of the laboratory will continue without any changes until March 1, 2019, when all activities will be relocated to DFM's facility in Hørsholm.



DFM’s Thermometry Lab calibrates a wide variety of instruments, and offers the following services, among others:

  • Temperature measurements and calibrations in the range from -196°C to +1600°C
  • Calibration of pressure (0-4 bar)
  • Calibration of voltage, current and resistance
  • On-site measurements
  • Non-contact thermometry (IR) calibrations
  • Consultancy

The Laboratory obtained its accreditation in 1978 and is approved by DANAK to issue certificates for calibrations of temperature, pressure, and DC electricity measuring equipment. The instruments at the laboratory are traceable to international standards.

The measurement capabilities (CMC) are found here on the DANAK website.

Further details on the calibration of resistance, DC voltage or current at the Thermometry Lab are found at this page.

For further information, please contact Mogens Kirkegaard, Finn Eliasen, or team leader Lisa C. DeLeebeeck.

The Thermometry Laboratory is currently located at the DTU Risø campus: Frederiksborgvej 399, Bygning 201, DK-4000 Roskilde, Denmark, tel. +45 2023 5431.



We calibrate various kinds of temperature instruments, and in most cases we will already have the programs and interfaces required for, e.g., data loggers at our disposal. The Laboratory is traceable through calibration using fixed-point references (e.g., triple point of water), according to the International Temperature Scale (ITS-90).

The measurement uncertainty depends partly on the actual instrument to be calibrated, partly on the calibration itself. For instance, the choice of temperature and sensor has a large influence on the result of the calibration.

Important factors in relation to the calibration include:

  • The quality of the instrument (in most cases, the quality and price are correlated)
  • The selected sensor, such as: thermocouples, resistance thermometers, and glass thermometers
  • The length of the sensor
  • Selected temperature range(s)

Choice of sensor: If the instrument has to be calibrated at a higher temperature (above +300°C), the sensor needs a sufficient length to be inserted into an oven, at a minimum of 35 cm, and should be able to withstand the heat, in order to optimize the calibration. With a short sensor, e.g., 10 cm, the calibration for temperatures above +300°C would, unfortunately, not be optimal. At temperatures between -150°C and -80°C, the sensor should possess a minimum length of 20 cm.

Choice of temperature: You may select the temperature of calibration freely between -196°C and +1600°C. However, the measurement uncertainty is lowest for temperatures below +660°C, as our instruments in this range are of the standard platinum resistance thermometer (SPRT) type, as compared to temperatures above 660°C, where we use thermocouples. Additionally, we carry out calibrations at low temperatures with immersion in liquids (alcohol, water, oil, and molten salt). This provides a better stability than can be obtained at higher temperatures in an electric oven. The table below shows our measurement capability (best-case uncertainty ranges) assuming a “best possible sensor”, and is the lowest possible measurement uncertainty we may offer.

Temperature range (°C) Best-case measurement uncertainty range (°C) Temperature regulation type
-196 - <0 0.006 - 0.012 Liquid N2 cryostat; alcohol bath
0 0.0025 Ice bath
>0 - 300 0.006 - 0.012 Water bath, oil bath
300 - 660 0.017 - 0.02 Molten salt bath
500 - 1600 0.5 - 2 Electric oven

Measurement range: You may freely select the temperatures at which you want your instrument calibrated. However, you get the best value for the calibration if you select a temperature range that encompasses the temperature range at which the instrument is regularly used.

Calibration intervals: How often should instruments be calibrated? That's for you to decide in agreement with the authorities. In most cases, however, we would recommend intervals no larger than one year. If you want us to remind you when it's time to get your equipment calibrated, you may sign up for our reminder service; contact us to learn more.