Pt100 Model L Low-Temperature Precision Thermometers

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

  • NEW design: gastight handle with inert gas filling
  • Temperature range: -200°C to 250°C
  • small measurement uncertainties: 11mK to 13mK
  • robust alternative to ITS-90 standard thermometers
  • high stability and good calibration capability
  • low hysteresis and drift due to inert gas

New design: gastight handle with inert gas filling

Due to the new design of the gas-tight handle, the thermometer’s protective tube can 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).


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 calibration of eXacal resistance thermometers is carried out at ITS-90 fixed points. It is also possible to carry out calibrations according to the comparison method in liquid baths and calibration furnaces. The measurement uncertainty is calculated from many components. The largest contributions are reproducibility, ITS-90 function, self-heating and hysteresis.


  • Small measurement uncertainties with DAkkS calibration certificate
  • Temperature fixed points from argon triple point –189,3442 °C  to tin freezing point 231.928 °C
  • ITS-90 standard thermometer for comparison calibration
Range Fixed Point Uncertainty
-189,3442°C Argon 11mK
-38,8344°C Mercury 5mK
0,01°C Water 5mK
29,7646°C Gallium 6mK
156,5985°C Indium 9mK
231,928°C Tin 10mK

The given measurement uncertainties correspond to k=2, include an ITS-90 function and are given for the respective range.

Technical data

Model eXacal Pt100L
Temperature range -189,4332 °C to 250 °C
Nominal resistance  Pt100 (100 Ohm)
typical annual drift  2,5mk
Connection type Four-wire
Connecting cable temperature resistant – very low EMF stranded wires from own production
Connection depending on configuration
Sheath material Metal
Thermometer wire silver
Handle  ∅20mm x 100mm (new design: gas tight)
diameter  6mm
Length depending on configuration
Connection cable depending on configuration
R0  100 Ohm ± 0,05 Ohm
Alpha  0,003850 ± 0,000005
Standard  IEC 60751:2008
tolerance  1/10 DIN
length  25mm
recommended measuring current  1mA
Self-heating  5mK to 10mK
DAkkS Calibration
Fixed point calibration 11mK to 13mK
Comparison calibration 15mK to 25mK


Questions about the thermometer?