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| Pt 100 Ω PROBES OVERVIEW, |
General Catalogue 610-1 |
Pt 100 Ω PROBES OVERVIEW
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Pt 100 Ω PROBES OVERVIEW,
The measure rely on variable resistance of metalic wires with temperature. Materials most often used are platinum and nickel.
Platinum offers a large temperature scale and a very good linearity. His pureness and chemical inertia guarantee a remarquable
stability of sensible elements
The relation between platinum resistance and temperature according norma CEI 751 follows :
Rt = Ro [ 1 + At + Bt2 + Ct2 (t - 100)]
Rt = Thermometer resistance at temperature t
Ro = Thermometer resistance at 0°C
t = Temperature in °C
A B C = coefficients détermined by calibration
C = at 0°C for positives temperatures
Industrial probes and boards are base on :
Ro = 100 Ohms
R 100°C = 138,5 Ohms
FRANCE NFC 42330
GERMANY DIN 43760
GREAT BRITAIN BS 1904
INTERNATIONAL CEI 751
acceptable tolérances in °C ± ( 0,15 + 0,002) for class A
acceptable tolérances in°C ± ( 0,3 + 0,005) for class B
is temperature value in °C.
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Pt 100 Ω PROBES OVERVIEW |
General Catalogue
610-1 |
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