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 from mercury triple point -38,8344 °C  to zinc freezing point 419,527 °C
• ITS-90 standard thermometer for comparison calibration

Range	Fixed Point	Uncertainty
-38,8344°C	Mercury	6mK
0,01°C	Water	6mK
29,7646°C	Gallium	6mK
156,5985°C	Indium	10mK
231,928°C	Tin	11mK
419,527°C	Zinc	21mK

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

Technical data

Model	eXacal Pt100N
Temperature range	-100 °C to 420 °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
Dimensions
Handle	∅ 20 mm x 100 mm
diameter	6 mm
Length	400 mm
Connection cable	2 m
Detector
R0	100 Ohm ± 0,05 Ohm
Alpha	0,003850 ± 0,000005
Standard	IEC 60751:2008
tolerance	1/10 DIN
length	25 mm
recommended measuring current	1 mA
Self-heating	5 mK to 10 mK
DAkkS Calibration
Fixed point calibration	6 mK to 21 mK
Comparison calibration	15 mK to 35 mK