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Platinum - 10% Rhodium-Platinum : These thermocouple Mutant wires used for he continuous measurement at temperatures upto 1500 °C and for spot readings upto 1650 °C
Platinum- 13% Rhodium-Platinum : These thermocouple wires are used over the same range as Pt: 10% Rh-Pt wires' these wires are often preferred as they produce slightly higher thermal emf
6% Rhodium-Platinum - 30% Rhodium-Platinum :
Technical Specification 01
| Properties | Pt-10%Rh | Pt-13%Rh | Pt-30%Rh | Pt-6%Rh | Pt | Rh |
| Density at 20 °C gm/cc | 19.97 | 19.95 | 17.62 | 20.51 | 21.45 | 12.41 |
| Melting Point °CU | 1830 | 1840 | 1910 | 1810 | 1769 | 1963 |
| Resistivity at 20°Cµ0-cm | 19.2 | 19.6 | 19.4 | 18.5 | 10.6 | 4.68 |
| Temperature coefficient of electrical resistance 1/°C | 1.66*10-3 | 1.56*10-3 | 1.3*10-3 | 2.0*10-3 | 3.92*10-3 | 4.63*10-3 |
| Linear coefficient of thermal expansion 1/°C | 9*10-5 | 9*10-6 | 8.8*10-8 | 9*10-6 | 9*10-6 | 8.3*10-8 |
| Specific heat at 0 °C Cal/gm °C | 0.035 | 0.036 | 0.04 | 0.034 | 0.031 | 0.059 |
| Tensile Strength Kg/mm | 32 | 34 | 55 | 21 | 14 | 77 |
| Elongation | 35 | 32 | 30 | 34 | 30 | 35 |
Specification 02
| Couples | Maximum Temperature of use °C | Sensitivity at 1064°C 1400°C 1554°C μV/°C |
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| Positive element | Negative element | Code as per IPTS 68 | Permanent Use | Temporary Use | |||
| Pt-10% Rh | Pt | S | 1500 | 1650 | 11.7 | 12.1 | 11.9 |
| Pt-13% Rh | Pt | R | 1500 | 1650 | 13.5 | 14.1 | 14 |
| Pt-30% Rh | Pt—6% Rh | B | 1600 | 1750 | 9.6 | 11.3 | 11.9 |
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