Pt100 Typ HD
temperature difference thermometer
(-100 °C … 660 °C)

1.885,00 3.371,00 

Each eXacal thermometer is supplied in a matching case. Optionally, a high-quality wooden carrying case can be ordered.
Manufacturer: Klasmeier / eXacal
Model: Pt100HD


Temperature difference thermometer for measurement of vertical temperature gradients and precise temperature measurement.

  • Temperature range: -100 °C to 660 °C
  • small measurement uncertainties: 6 mK and 25 mK
  • Measurement of vertical temperature gradients
  • Temperature standard and temperature difference thermometer

The thermometer for temperature differential measurement is a practical helper in daily laboratory work. The thermometer facilitates the work at the:

  • Determining vertical temperature gradients
    Vertical temperature gradients must be determined as part of the measurement uncertainty of a calibration (e.g. according to DKD-R 5-4 “Calibration of block calibrators”, DKD-R 5-3 “Calibration of thermocouples” or DKD-R 5-1 “Calibration of resistance thermometers”).
  • Optimizing calibration furnaces
    When optimizing heating zones on calibration furnaces, such as the 3-zone high-temperature calibration furnaceor the Medusa calibration furnace, precise temperature differences must be measured.
  • Precise temperature standard
    The main measuring point of the differential thermometer corresponds to the design of the eXacal Pt100 M and can be calibrated with the same measurement uncertainties. Thus, the differential thermometer can be used not only for measuring temperature differences but also as a temperature standard.

The differential thermometer consists of two Pt 100 temperature sensors positioned at the bottom of the thermometer and 4 cm apart. 


Schematische Darstellung des Differenz-Thermometers

Schematic design of the differential thermometer

Measurement uncertainty

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

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

With the differential thermometer, the main measuring point is calibrated at fixed temperature points. The second measuring point is measured by a differential measurement at maximum immersion depth in a heat pipe with an extremely good vertical profile. 

  • small measurement uncertainties with DAkkS calibration certificate
  • Temperature fixed points from mercury triple point -38,8344 °C to tin freezing point 231,928 °C
  • Differential measurement in a heat pipe / heat pipe furnace

Temperature range Method Measurement uncertainty
-38,8344 °C – 0,01 °C Mercury triple point 6 mK
0,01 °C – 29,7646 °C Gallium melting point 6 mK
0,01 °C – 156,5985 °C Indium melting point 10 mK
0,01 °C – 231,928 °C Zinn melting point 11 mK
0,01 °C – 419,527 °C Zink melting point 21 mK
0,01 °C – 660,323 °C Aluminium melting point 25 mK

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


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    Additional information

    Select calibration

    inclusive DAkkS Calibration, without DAkkS Calibration

    Technical Data

    Model eXacal Pt100 HD
    Temperature range  -100 °C to 660 °C
    Nominal resistance  Pt100 (100 Ohm)
    Connection type  Vier-Leiter
    Connection  Bananaplugs or depending on configuration
    Sheath material  Metal
    Thermometerwire  Platinum
    Handle  ∅ 20 mm x 100 mm
    Diameter  6 mm
    Length  500 mm
    Connection cable  2 m
     measurement resistor / temperature sensor
    Length  15 mm
    Recommended measurement current  1 mA
    Self-heating  4 mK
    Calibration (Main measuring point)
    Fixed point calibration  6 mK to 25 mK
    Comparison calibration  16 mK to 50 mK