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IEC 751 PRT Utility
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More Info, Accuracy and a Disclaimer
Calculate Temperature for Resistance Input
Temperature is calculated for the coefficient values shown below. You can enter calibration data to calculate custom coefficients and then use these values to convert ohms to Celsius, the resistance / temperature relationship is defined, for the range -200°C to 0°C
Rt=Ro[1 + At + Bt
2
+ C(t-100°C) t
3
]
for the range 0°C to 850°C
Rt=Ro(1 + At + Bt
2
)
Convert Resistance to Temperature
Ohms:
Disclaimer
Temperature °C:
Coefficients
A :
B :
C :
Calculate Custom Probe Coefficients
Use either standard values from IEC-751 (default), enter values or enter a probes calibration data to calculate values for a particular probe. For this form you need two suitable temperature / resistance points and either the resistance at 0°C or 0.01°C. Entering a third temperature, below 0°C will allow the C coefficient to be calculated. This is only used for temperatures less than 0°C and both T3/R3 and C can be ignored for temperatures above 0°C
T1 :
T2 :
T3 :
R1 :
R2 :
R3 :
Select Ro or Rwtp
Enter either Ro (Resistance at 0°C) or Rwtp (Water Triple Point Value) to match selection
Ro
Rwtp
Disclaimer
Ro:
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