The eXacal precision thermometers are used for precise temperature measurements or as calibration standards.

NEW design: gas-tight handle with inert gas filling

Temperature range: -200 °C to 250 °C

small measurement uncertainties: 11 mK to 13 mK

robust alternative to ITS-90 standard thermometers

high stability and good calibration capability

low hysteresis and drift through inert gas

New design: gas-tight handle with inert gas filling

The new design of the gas-tight handle allows the thermometer’s protection tube to be filled with a protective gas. This improves the properties of the thermometer and ensures less drift and hysteresis at the extremely low temperatures down to the argon point (-189 °C).

Calibration

eXacal thermometers are calibrated in our own DAkkS calibration laboratory. The DAkkS accreditation ensures that all calibrations are traceable to national and international standards.

The precision thermometers have been designed so that they can be calibrated very well at temperature fixed points up to the argon triple point. However, calibration can also be done by using the comparison method. Small measurement uncertainties are achieved with the temperature fixed points used. A comparison calibration is done by with ITS-90 standard thermometers as calibration standards in calibration baths and calibration furnaces. The measurement uncertainty is calculated from many components. The largest component are reproducibility, ITS-90 characteristic, selfheating an hysteresis.

Calibration of resistance thermometers

Measurement uncertainties

Small measurement uncertainties with DAkkS calibration certificate

Temperature fixed points from argon triple point -189,3442 °C to tin melting point 231,928 °C

ITS-90 Standard thermometer during comparison calibration

Temperature range	Method	Measurement uncertainty
-189,3442 °C – 0,01 °C	Argon to water	12 mK
-38,8344 °C – 0,01 °C	Mercury to water	10 mK
0,01 °C – 29,7646 °C	Water to gallium	12 mK
0,01 °C – 156,5985 °C	Water to indium	11 mK
0,01 °C – 231,928 °C	Water to tin	11 mK

The specified measurement uncertainties are k=2, include an ITS-90 characteristic curve and are given for the respective range

Kalibrierung

Kalibrator für Infrarot Thermometer 20°C bis 50°C

Kalibrierstrahler Pegasus R bis 1200 °C

Kalibrierstrahler Hyperion R -20°C bis 125°C

Pt100 Model L Low-Temperature Precision Thermometer(-200 °C to 250 °C)

Kalibrator für Infrarot Thermometer
20°C bis 50°C

Kalibrierstrahler Pegasus R
bis 1200 °C

Kalibrierstrahler Hyperion R
-20°C bis 125°C