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 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.

Measurement Uncertainties

• Small measurement uncertainties with DAkkS calibration certificate
• Temperature fixed points up to aluminium freezing point 660,323 °C
• ITS-90 standard thermometer for comparison calibration

Range	Fixed Point	Uncertainty
0,01 °C	Water	6 mK
29,7646 °C	Gallium	6 mK
156,5985 °C	Indium	10 mK
231,928 °C	Tin	11 mK
419,527 °C	Zinc	21 mK
660,323 °C	Aluminium	25 mk 150 mK @ 850 °C

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

Technical data

Model	eXacal Pt100HS
Temperature range	0 °C to 850 °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	gas-tight ceramic
Thermometer wire	Platinum
Dimensions
Handle	∅ 20 mm x 100 mm
diameter	6 mm
Length	500 mm
Connection cable	2 m
Detector
R0	100 Ohm ± 0,05 Ohm
Alpha	0,003850 ± 0,000005
Standard	IEC 60751:2008
tolerance	individual calibration
length	25 mm
recommended measuring current	1 mA
Self-heating	4 mK
DAkkS Calibration
Fixed point calibration	6 mK to 25 mK
Comparison calibration	15 mK to 150 mK