For high-temperature furnace and kiln applications where MgO-sheathed probes are insufficient, Thermometrics manufactures protection-tube thermocouple assemblies with ceramic, silicon carbide, and refractory-metal outer tubes. The inner thermocouple element is replaceable, minimizing downtime and calibration cost.
| Model | Name | Protection Tube | Element | Max Temp | Atmosphere |
|---|---|---|---|---|---|
| TC-100 | Base Metal TC — Fixed Metal Protection Tube | Carbon steel or 310SS | Type K or N, replaceable | 1000°C | Oxidizing / neutral |
| TC-101 | Base Metal TC — Adjustable Mounting Sleeve & Protection Tube | 310SS or Inconel | Type K or N, replaceable | 1100°C | Oxidizing; reducing short-term |
| TC-102 | Base Metal TC — Heavy-Duty Metal Tube | Inconel 600 heavy wall | Type K, N, or R, replaceable | 1150°C | Oxidizing; reduces Type K drift |
| TC-111 | Base Metal Thermocouple Element (bare, no tube) | None — element only | Type K, J, N, T, E | Type-dependent | For insertion into customer-supplied tube |
| TC-200 | Noble Metal TC — Mullite / Alumina Ceramic Tube | 99.7% Al₂O₃ single or twin bore | Type R or S, replaceable | 1480°C | Oxidizing; inert; clean vacuum |
| TC-202 | TC — SiC Outer + Alumina Inner Dual Protection Tube | Silicon carbide outer, alumina inner | Type K or N | 1450°C (SiC rated) | Molten non-ferrous metals; thermal shock resistant |
| TC-300 | Molten Metal / Holding Furnace TC — Angled SiC Tube | Silicon carbide, L-shaped / angled | Type K or N | 900°C (aluminum melt) | Molten aluminum; zinc; non-ferrous alloys |
Silicon carbide (SiC) protection tubes offer the thermal shock resistance and chemical resistance required for continuous immersion in molten non-ferrous metals. Unlike alumina ceramics, SiC withstands the rapid thermal cycling of aluminum holding furnaces without cracking.
| Property | SiC Tube (TC-202/300) | Alumina Tube (TC-200) |
|---|---|---|
| Thermal Shock | Excellent | Moderate — avoid quenching |
| Max Temp | 1450°C | 1750°C (99.7% Al₂O₃) |
| Molten Al Resistance | Excellent | Poor — Al wets alumina |
| Oxidizing Resistance | Good | Excellent |
| Mechanical Strength | High | Moderate |
TC-100 and TC-200 series assemblies are used as control, load, survey, and monitoring thermocouples in heat treating furnaces certified per AMS 2750 and CQI-9. NIST-traceable calibration certificates issued with all noble-metal (TC-200) assemblies. Base-metal (TC-100) lot-certified wire documentation available.
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