The DIN 43760 standardised temperature coefficient of platinum wire is: α = 0.00385. For a resistance of 100 ohms at 0 °C, this corresponds to + 0.385 ohm per °C (European α). α is therefore the average slope from 0°C to 100°C $$ \alpha = \frac{{{R_{100}} – {R_0}}}{{ {R_0} \times 100^\circ C.}} $$. There is a wide range of RTDs which have different α coefficients and ohm values at 0°C detailed in their technical properties. The most commonly used RTD is that with an α coefficient of 0.00385 and ohm value at 0°C of 100 Ω. It is known as Pt100.
Values of some RTDs
R at 0°C (Ω)
α (Ω/Ω/°C)
Average sensitivity (Ω/°C)
25.5
0.00392
0.1
100
0.00392
0.392
100
0.00391
0.391
100
0.00385
0.385
200
0.00385
0.770
470
0.00392
1.845
500
0.00392
1.963
500
0.00391
1.955
500
0.00385
1.925
1000
0.00385
3.850
1000
0.00375
3.750
10000
0.00385
38.50
International standards DIN 43760 (IEC 751, BS-1904, JIS C1604)
Parameter
Class A
Class B
R0
100Ω ±0,06%
100Ω ±0,12%
Alpha, α
0,00385 ±0,000063
0,00385 ±0,000063
Range
-200°C to 650°C
-200°c to 850°C
Res, RT
±(.06+.0008|T|-2e-7T2)
±(.12+.0019|T|-6e-7T2)
Temp, T
±(0.3+0.002|T|)°C
±(0.3+0.005|T|)°C
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