R
Type R — Pt-13%Rh / Pt Thermocouple
Platinum-13% Rhodium / Pure Platinum. Noble metal thermocouple for high-temperature oxidizing service. Higher Rh content than Type S gives slightly higher EMF at elevated temperatures. Requires alumina ceramic insulation above 1000°C.
ASTM E1751Noble Metal
At-a-Glance Specifications
1480°C
±1.5°C or ±0.25%
±0.6°C or ±0.1%
ASTM E1751
EMF Reference Values — Type R (ASTM E1751)
Selected EMF values in millivolts referenced to 0°C. Full tables available on the EMF Tables page.
Key EMF Values
0°C=0.000, 200°C=1.469, 400°C=3.408, 600°C=5.583, 800°C=7.950, 1000°C=10.503, 1200°C=13.228, 1480°C=17.366 mV
Limits of Error — ASTM E1751 / IEC 60584-2
| Class | Range | Limit of Error |
|---|---|---|
| Standard | 0 to +1480°C | ±1.5°C or ±0.25% (whichever greater) |
| Special | 0 to +1480°C | ±0.6°C or ±0.1% (whichever greater) |
ASTM E1751 — Applicable Standard
All specifications, EMF-temperature tables, and tolerance limits for Type R are defined under ASTM E1751. Consult the current edition of this standard for complete reference function coefficients and limits of error across all temperature sub-ranges.