Description
Temperature difference thermometer for determining vertical temperature gradients and precise temperature measurement.
Temperature range: -100 °C to 250 °C
small measurement uncertainties: 6 mK and 11 mK
Determination of vertical temperature gradients
Temperature standard and temperature difference thermometer
The thermometer for differential temperature measurement is a practical aid for everyday laboratory work. The thermometer makes work easier in the:
Determination of 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’).
Optimising calibration furnaces
When optimising heating zones on calibration furnaces, such as the 3-zone high-temperature calibration furnace or the Medusa calibration furnace, precise temperature differences must be determined.
Precise temperature standard
The main measuring point of the differential thermometer corresponds to the design of the eXacal PT 100 M and can be calibrated with the same measurement uncertainties. This means that the differential thermometer can be used not only to measure temperature differences but also as a temperature standard.
The differential thermometer consists of two Pt100 temperature sensors, which are positioned at the bottom of the thermometer and 4 cm apart.
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Measurement uncertainty
eXacal thermometers can be calibrated in our own DAkkS calibration laboratory. DAkkS accreditation ensures that all calibrations are traceable to national and international standards.
The eXacal resistance thermometers are calibrated at ITS-90 fixed points. It is also possible to carry out calibrations using the comparison method in calibration baths and calibration ovens. The measurement uncertainty is calculated from many components. The largest contributions are reproducibility, ITS-90 characteristic curve, self-heating and hysteresis.
With the differential thermometer, the main measuring point is calibrated at fixed temperature points. The second measuring point is calibrated by a differential measurement at maximum immersion depth in a heat pipe (heating tube furnace) 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 solidification point 231.928 °C
Differential measurement in a heat pipe / heat pipe furnace
| Range | Procedure | Measurement uncertainty |
|---|---|---|
| -38,8344 °C – 0,01 °C | Mercury to Water | 6 mK |
| 0,01 °C – 29,7646 °C | Water to Gallium | 6 mK |
| 0,01 °C – 156,5985 °C | Water to Indium | 10 mK |
| 0,01 °C – 231,928 °C | Water to Tin | 11 mK |
More temperature difference thermometer
Type R / Type S
temperature difference thermocouple
(0 °C … 1200 °C)
Manufacturer: Klasmeier / eXacal model: Type R/ Type S difference thermocouple
