Introduction
Disposable thermocouple wire (also named expendable thermocouple wire) was introduced to China's aerospace industry before 2000, following the AMS2750 high-temperature measurement standard released by SAE International.
This product is thermocouple wire insulated and sheathed with fiber or plastic coating, also known as single-use thermocouple. Its appearance and manufacturing process are similar to thermocouple extension wire, widely applied for temperature measurement in aerospace and related industries.
As there is no dedicated national standard for expendable thermocouples in China, our production strictly follows two authoritative specifications:
ASTM/E574 Standard Specification for Base Metal Thermocouple Wire, Glass Fiber or Silica Fiber Insulated
GB/T9489-2013 Thermocouple Extension Wire
Our Aerospace R&D Background
In 2019, our company was commissioned by COMAC Shanghai Aircraft Manufacturing Co., Ltd. to participate in a key MIIT civil aircraft research project - Research on On-site Calibration Technology & Digital Metrology Support Platform for Heat Treatment Equipment Key Performance Parameters. We took charge of the sub-project for expendable thermocouple development.
Product Core Advantages
Standard Compliance: Fully meets AMS2750 & ASTM/E574 aerospace standards
High Temperature Resistance: Max measuring temperature up to 1000℃
Premium Accuracy: Class 1 precision, head-to-tail temperature deviation ≤0.6℃
Eco-friendly Material: No peculiar smell at initial use
Reusable Performance: Supports multiple measuring cycles under upper limit temperature
Structure: High silica fiber insulation + heat-resistant steel wire shielding
AMS2750 Thermocouple Classification
Per AMS2750 aerospace standard, thermocouples are categorized into 5 types for heat treatment scenarios:
Test Thermocouples For System Accuracy Test (SAT) & Temperature Uniformity Survey (TUS)
Monitor Thermocouples Connected to furnace monitoring instruments, for process control, real-time monitoring & data recording
Load Thermocouples Attached or embedded into workpieces to measure actual part temperature
Disposable / Expendable Thermocouples Thermocouple wire with fiber/plastic insulation & sheath (our core product)
Non-Disposable Thermocouples Reusable types, including assembled thermocouples & mineral insulated sheathed thermocouples
AMS2750 Standard Tolerance
|
Thermocouple Grade |
K / N / E / J / T |
R / S |
B |
|
Tolerance |
±1.1℃ or 0.4%t |
±0.6℃ or 0.1%t |
±0.6℃ or 0.25%t |
AMS2750 Calibration Specifications
Disposable thermocouples, plus K/N/T type non-disposable thermocouples operating above 260℃, cannot be re-calibrated.
Calibration requirements: Calibrate at specified temperature points; temperature interval between calibration points shall not exceed 140℃.
Maximum length limits for coiled thermocouple cables:
Expendable thermocouple wire & MI sheathed thermocouple cable: ≤610 meters
Base metal thermocouple wire: ≤1525 meters
Application Fields
Civil aviation aircraft manufacturing, aerospace heat treatment furnaces, SAT/TUS furnace system testing, workpiece temperature monitoring, precision high-temperature industrial measurement
Company Profile
Dazheng Instrument - Professional Temperature Measurement Solution Supplier We provide full-set AMS2750 compliant thermocouple products and one-stop temperature calibration supporting solutions for global aerospace heat treatment factories.