Calibration
object |
Range/
Fixed points |
Method of
Measuring |
Smallest
measurable
uncertainty |
Remarks |
Resistance
thermometers,
Direct indicating
electrical
thermometers,
Mechanical
thermometers,
Liquid-in-glass
thermometers,
| -196 °C |
liquid nitrogen |
50 mK |
Comparison with
SPRTs or standard
Liquid-in-glass
thermometers
|
> -90 °C
to 0 °C |
Cryostat (Kältebad) |
20 mK |
> 0 °C
to 250 °C |
water bath/oil bath |
10 mK |
> 250 °C
to 500 °C |
salt bath |
50 mK |
> 500 °C
to 660 °C |
100 mK |
Precious metal,
thermocouples (TCs),
Temperature
indikators and
simulators for
thermocouples |
> 0 °C
to 100 °C |
liquid bath
or furnace |
0.3 K |
Comparison with
SPRTs or
thermocouples |
> 100 °C
to 500 °C |
0.5 K |
> 500 °C
to 1000 °C |
1.0 K |
> 1000 °C
to 1200 °C |
1.5 K |
> 1200 °C
to 1300 °C |
2.0 K |
Non-precious metal,
thermocouples (TCs) |
> -90 °C
to 300 °C |
liquid bath
or furnace |
0.5 K |
Comparison with
SPRTs or
thermocouples |
> 300 °C
to 600 °C |
1.0 K |
> 600 °C
to 1000 °C |
1.5 K |
> 1000 °C
to 1200 °C |
2.0 K |
> 1200 °C
to 1300 °C |
3.0 K |
Temperature
block calibrators |
-30 °C
to 133 °C |
|
0.20 K |
Comparison with
SPRTs*** |
> 133 °C
to 660 °C |
1.5 mK · t/°C |
0 °C
to 660 °C |
1.5 K |
Comparison with
thermocouples |
660 °C
to 1000 °C |
2.5 K |
> 1000 °C
to 1300 °C |
4.5 K |
