B
Type B — Pt-30%Rh / Pt-6%Rh Thermocouple
Platinum-30% Rhodium / Platinum-6% Rhodium. Unique characteristic: near-zero EMF output below 50°C means cold junction temperature compensation is essentially non-critical at room temperature. Both legs contain rhodium, making it the most oxidation-resistant of the PtRh types.
ASTM E1751Noble Metal
At-a-Glance Specifications
1700°C
±0.5% (above 600°C)
±0.25% (above 600°C)
ASTM E1751
EMF Reference Values — Type B (ASTM E1751)
Selected EMF values in millivolts referenced to 0°C. Full tables available on the EMF Tables page.
Key EMF Values
600°C=1.792, 700°C=2.431, 800°C=3.154, 900°C=3.957, 1000°C=4.834, 1200°C=6.786, 1400°C=9.164, 1700°C=13.820 mV
Limits of Error — ASTM E1751 / IEC 60584-2
| Class | Range | Limit of Error |
|---|---|---|
| Standard | +600 to +1700°C | ±0.5% (above 600°C) (whichever greater) |
| Special | +600 to +1700°C | ±0.25% (above 600°C) (whichever greater) |
ASTM E1751 — Applicable Standard
All specifications, EMF-temperature tables, and tolerance limits for Type B 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.