Pt100 Model M Medium Temperature Precision Thermometers

Precision resistance thermometer with thin metal sheath and extra small ceramic detector. This eXacal thermometer was developed to determine radial and vertical temperature profiles.

  • Temperature range: -50 °C to 230 °C
  • small measurement uncertainties: between 5 mK and 10 mK
  • fast measuring times due to thin detector 
  • good heat connection due to small measuring resistance
  • optimal for the determination of vertical temperature gradients

This eXacal thermometer was developed to determine vertical and radial temperature profiles in calibration equipment as part of the measurement uncertainty. This is required in several directives, such as the german DKD-R 5-4 “Calibration of dry-well calibrators”, DKD-R 5-3 “Calibration of thermocouples” or DKD-R 5-1 “Calibration of resistance thermometers”. The thermometer is also suitable for measuring and setting heating zones on calibration furnaces. Of course, the thermometer can also be generally used for accurate temperature measurement.


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 the reproducibility, ITS-90 function, self-heating and hysteresis.

Uncertainty of measurement

The configurable DAkkS calibration includes a 3-point DAkkS comparison calibration. This ensures basic traceability. Depending on the design, the thermometers can also be calibrated with smaller measurement uncertainties at fixed temperature points.

  • Small measurement uncertainties with DAkkS calibration certificate
  • Temperature fixed points from mercury triple point -38.8344 °C to tin freezing point 231.928 °C
  • ITS-90 standard thermometer for comparison calibration

Range Fixed Point Uncertainty
-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 Pt100M
Temperature range – -50°C to 250°C
Nominal resistance Pt100 (100 Ohm)
typical annual drift 2,5 mk
Connection type Four-wire
Connecting cable temperature resistant – very low EMF stranded wires from own production
Connection banana plugs or depending on configuration
Sheath material Metal
Thermometer wire silver
Handle ∅ 20 mm x 100 mm
diameter 4 mm
Length 400 mm
Connection cable 2 m
R0 100 Ohm ± 0,05 Ohm
Alpha 0,003850 ± 0,000005
Standard IEC 60751:2008
tolerance 1/10 DIN
length 6 mm
recommended measuring current 1 mA
Self-heating 30 mK @ 1 mA at 29,7646 °C (Gallium melting point)
DAkkS Calibration
Fixed point calibration 5 mK to 10 mK
Comparison calibration 10 mK to 25 mK


Questions about the thermometer?