Heat treating furnaces demand temperature sensors capable of extended high-temperature service in oxidizing, reducing, and vacuum atmospheres. Thermometrics manufactures thermocouple assemblies to AMS 2750 pyrometry requirements and CQI-9 heat treat system assessment criteria.
| Sensor Type | TC Type | AMS 2750 Use | Max Temperature | Notes |
|---|---|---|---|---|
| Control Thermocouple | Type K or N | Process control, Class 2–5 | 1100°C (K) / 1250°C (N) | Calibration every 90 days or per lot |
| Load Thermocouple | Type K, N, or R | Part temperature verification | 1480°C (R) | Single-use or limited-use per AMS 2750 |
| Survey Thermocouple | Type K, N, or R | Temperature uniformity survey (TUS) | 1480°C (R) | 9-point or 9+ point survey per equipment class |
| Monitoring Thermocouple | Type K or N | Continuous over-temperature alarm | 1250°C | Independent from control sensor |
| Expendable (Single-Use) | Type K or N | Limited-life load thermocouples | 1100°C | No calibration required — lot-certified wire |
AMS 2750 defines recalibration intervals based on thermocouple type and usage. Base-metal (Type K/N) thermocouples used above 760°C require recalibration after no more than 90 days or 500 hours of use at temperature. Noble-metal (Type R/S) thermocouples are recalibrated annually or per lot. Thermometrics issues NIST-traceable calibration certificates with individual Seebeck coefficient correction tables for all calibrated furnace thermocouples.
High-purity MgO tubes protect Type R and S noble-metal thermocouples from contamination in furnace atmospheres. Available in single-bore and twin-bore configurations, closed-one-end, in lengths to 60".
Bayonet-mount and ceramic-lug thermocouple assemblies for fast insertion and removal during temperature uniformity surveys. Type K and Type N, with standard calibration certificate and lot-traceable extension wire.
Thermocouples and RTDs for vacuum furnace applications: clean metal sheaths (no coatings or lubricants), ultra-high-purity MgO insulation, and helium leak-tested tip closures to prevent outgassing in vacuum systems below 10⁻⁴ Torr.
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