Pyrometry Precision for Heat Treatment
Heat treating operations require precise, documented temperature measurement to ensure metallurgical properties meet specification requirements. AMS 2750 (Pyrometry) establishes the requirements for thermal processing equipment used in the heat treatment of metallic materials, including thermocouple types, accuracy classes, and calibration intervals.
Thermometrics manufactures thermocouple assemblies specifically designed for heat treating applications — from expendable base metal types for routine production to noble metal types (R, S, B) for System Accuracy Tests (SATs) and Temperature Uniformity Surveys (TUS). Our sensors support your AMS 2750 compliance program with NIST-traceable calibration and complete documentation.
AMS 2750 Compliance
AMS 2750 Rev F defines thermocouple types, accuracy requirements, and calibration intervals for pyrometry systems in heat treatment. Thermometrics supplies thermocouples that meet AMS 2750 instrument type and accuracy class requirements, with NIST-traceable calibration certificates that satisfy SAT reference standard requirements.
SAT & TUS Support
System Accuracy Tests (SATs) and Temperature Uniformity Surveys (TUSs) are the foundation of AMS 2750 pyrometry compliance. We supply calibrated test thermocouples for both SAT reference standards and TUS survey sensors, with documentation packages designed to satisfy Nadcap audit requirements.
Heat Treating Applications
Our heat treating thermocouples are used across the full spectrum of thermal processing operations where AMS 2750 pyrometry compliance is required.
Vacuum Furnaces
Control and over-temperature thermocouples for vacuum heat treating furnaces. Type K and N for standard operations to 1100°C; Type R and S for high-temperature applications to 1450°C. Ceramic-insulated assemblies that withstand vacuum atmospheres without outgassing.
Atmosphere Furnaces
Continuous and batch atmosphere furnace thermocouples for endothermic, exothermic, and nitrogen-based atmospheres. Protection tubes in mullite, alumina, and silicon carbide for extended service life. Multi-zone control thermocouples for temperature uniformity.
Carburizing & Carbonitriding
High-carbon atmosphere thermocouple assemblies with carbon-resistant protection tubes. Expendable thermocouples for load monitoring during carburizing cycles. Noble metal reference thermocouples for SAT verification of control instruments.
Nitriding
Thermocouples for gas nitriding and ferritic nitrocarburizing processes. Ammonia-resistant sheath materials and protection tubes. Sensors designed for the precise temperature control (±5°C) required for consistent nitrided case properties.
Solution Treating & Aging
Thermocouple assemblies for aluminum, titanium, and nickel alloy solution treating and aging operations. Fast-response sensors for rapid-quench applications. TUS survey thermocouples for qualifying furnace working zones per AMS 2750.
Brazing & Sintering
Vacuum brazing and sintering furnace thermocouples rated to 1700°C. Type B (Pt-Rh) for high-temperature brazing in vacuum or hydrogen atmospheres. Expendable thermocouples for load monitoring during critical braze cycles.
Heat Treating Sensor Assemblies
Thermometrics supplies a complete range of thermocouples for heat treating applications — from expendable production sensors to noble metal reference standards.
Base Metal Thermocouples
Type K and N thermocouple assemblies for routine production furnace control and monitoring. Available with ceramic protection tubes for extended service life.
- Type K: to 1100°C
- Type N: to 1200°C
- Ceramic protection tubes
- Multi-zone configurations
Noble Metal Thermocouples
Type R, S, and B thermocouple assemblies for high-temperature applications, SAT reference standards, and TUS survey sensors.
- Type R/S: to 1450°C
- Type B: to 1700°C
- Platinum-rhodium wire
- NIST-traceable calibration
Expendable Thermocouples
Expendable thermocouple assemblies for load temperature monitoring during production heat treat cycles. Single-use and limited-life designs.
- Type K, N standard
- Flexible and rigid configs
- Load monitoring inserts
- Bulk pricing available
Heat Treating Sensor Specifications
| Parameter | RTD Sensors | Thermocouples |
|---|---|---|
| Temperature Range | Type K: -200°C to +1100°C | Type R/S: to 1450°C; Type B: to 1700°C |
| Accuracy Class | AMS 2750 Class 1-5 | AMS 2750 Class 1-5 |
| Protection Tubes | Inconel 600, 310 SS | Mullite, alumina, SiC, Pt-Rh |
| Insulation | MgO mineral insulation | Alumina 2-bore and 4-bore |
| Calibration | NIST-traceable, as-found/as-left | NIST-traceable, as-found/as-left |
| SAT Reference | N/A | Available per AMS 2750 |
| TUS Survey | Available per AMS 2750 | Available per AMS 2750 |
| Documentation | COC, NIST cal, wire lot cert | COC, NIST cal, wire lot cert |
Thermocouple Drift & Replacement
AMS 2750 requires periodic thermocouple accuracy verification and defines maximum use temperatures and exposure limits for each thermocouple type. Thermometrics can establish a scheduled replacement program for your facility, ensuring fresh, calibrated sensors are available before existing sensors reach their end-of-life. Contact us to discuss thermocouple management for your pyrometry program.
Your Heat Treating Sensor Partner
Pyrometry Compliance Made Simple
AMS 2750 pyrometry compliance requires careful attention to thermocouple type, accuracy class, and calibration intervals. Thermometrics simplifies this process.
- AMS 2750 compliant thermocouple assemblies
- NIST-traceable calibration per AMS 2750 requirements
- Noble metal reference standards for SAT testing
- TUS survey thermocouples with calibration
- Expendable production thermocouples in bulk
- Thermocouple management and replacement programs
- Ceramic protection tubes for extended life
- Technical support for pyrometry questions
Nadcap-Ready Documentation
Heat treating facilities subject to Nadcap audit require comprehensive thermocouple documentation. We provide:
- Certificate of Conformance (COC)
- NIST-traceable calibration certificate
- As-found / as-left calibration data
- Wire lot traceability certificates
- Thermocouple type and accuracy declarations
- Material certificates for protection tubes
- Recommended replacement schedules per AMS 2750
- Calibration interval tracking support
Ready to Spec Your
Heat Treating Sensors?
Tell us about your furnace types, operating temperatures, and AMS 2750 accuracy class requirements. We will recommend the right thermocouple solutions and provide a detailed quotation.