Type R, S, or B Platinum Thermocouple enclosed in a high purity alumina protection tube. Standard construction includes cast iron NB1-2 connection head and 1/2″ NPT fitting. For use at temperatures up to 1650°C (3000°F). Elements are insulated by a double bore high purity hard-fired alumina insulator.
Assemblies
| Model Number | Thermocouple Calibration | AWG Wire Size | Protection Tube OD mm (in.) | Insulator OD mm (in.) |
| RAT-30-12″ | R (Pt/13%Rh vs Pt) | 30 | 6.0 (1/4) | 3.0 (1/8) |
| RAT-24-12″ | R (Pt/13%Rh vs Pt) | 24 | 6.0 (1/4) | 3.0 (1/8) |
| RAT-20-12″ | R (Pt/13%Rh vs Pt) | 20 | 9.5 (3/8) | 4.5 (3/16) |
| SAT-30-12″ | S (Pt/10%Rh vs Pt) | 30 | 6.0 (1/4) | 3.0 (1/8) |
| SAT-24-12″ | S (Pt/10%Rh vs Pt) | 24 | 6.0 (1/4) | 3.0 (1/8) |
| SAT-20-12″ | S (Pt/10%Rh vs Pt) | 20 | 9.5 (3/8) | 4.5 (3/16) |
| BAT-30-12″ | B (Pt30%Rh vs Pt/6%Rh) | 30 | 6.0 (1/4) | 3.0 (1/8) |
| BAT-24-12″ | B (Pt30%Rh vs Pt/6%Rh) | 24 | 6.0 (1/4) | 3.0 (1/8) |
| BAT-20-12″ | B (Pt30%Rh vs Pt/6%Rh) | 20 | 9.5 (3/8) | 4.5 (3/16) |
Note: Alumina tube shipped separately to avoid breakage. Shipped unassembled.
Replacement Elements for Assemblies Shown Above
| Type of Element | AWG Wire Size | Insulator 99.7% + Al2O3 | Type S Pt/10%Rh-Pt | Type R Pt/13%Rh-Pt | Type B Pt/30%Rh- Pt/6%Rh |
| Bare wires (No Insulators) | 20 24 30 | N/A N/A N/A | BARE-20-S-12 BARE-24-S-12 BARE-30-S-12 | BARE-20-R-12 BARE-24-R-12 BARE-30-R-12 | BARE-20-B-12 BARE-24-B-12 BARE-30-B-12 |
| Double-Hole Round Insulators | 20 24 30 | XDH-20 XDH-24 XDH-30 | XDH-20-S-12 XDH-24-S-12 XDH-30-S-12 | XDH-20-R-12 XDH-24-R-12 XDH-30-R-12 | XDH-20-B-12 XDH-24-B-12 XDH-30-B-12 |
* Replacement elements include leads of sufficient length to reach terminals in head.
Wire Size Conversion
| AWG | Actual Diameter |
| 6 8 10 12 14 16 18 20 22 24 26 30 | 4.1 mm (0.162″) 3.2 mm (0.128″) 2.5 mm (0.102″) 2.0 mm (0.081″) 1.6 mm (0.064″) 1.2 mm (0.051″) 1.0 mm (0.040″) 0.8 mm (0.032″) 0.6 mm (0.0253″) 0.5 mm (0.0201″) 0.41 mm (0.0159″) 0.25 mm (0.0100″) |
View the Thermocouple Accuracy and Color Code charts





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