Armored thermocouples are typically used in conjunction with display instruments, recording devices, and electronic computers. They directly measure temperatures ranging from 0°C to 1300°C for liquids, steam, gaseous media, and solid surfaces in various production processes.

Key Features

✔ Fast Response

• Short thermal response time (typically <5 sec), significantly reducing dynamic measurement errors

✔ Flexible Installation

• Bendable design (minimum bending radius up to 5x sheath diameter), suitable for complex installations

✔ Wide Measurement Range

• Standard range: 0~1300°C (varies by thermocouple type)

✔ Superior Mechanical Properties

• Stainless steel/Inconel sheath, withstands pressures up to 100MPa
• IP65 protection rating, resistant to vibration and shock

✔ Long-Term Stability

• Magnesium oxide (MgO) insulation ensures electrical stability at high temperatures

Working Principle

Based on the Seebeck Effect:

• Two dissimilar conductor materials form a closed circuit
• Temperature difference between measuring and reference junctions generates thermoelectric potential (EMF)
• Connected instruments convert EMF to temperature readings

Typical Applications

◼ Petrochemical: Reactors, pipeline temperature monitoring
◼ Power Generation: Boilers, steam systems
◼ Metallurgy: Continuous casting, steel rolling processes
◼ Laboratories: Material research, high-temperature experiments

Technical Parameters

Parameter	Specification
Electrical Connection	M20×1.5 / NPT½
Accuracy Class	Class I / II (IEC 60584)
Protection Rating	IP65
Wire Diameter	Φ0.5mm standard (options: Φ0.2~Φ3.2mm)
Pressure Rating	Atmospheric~100MPa (high-pressure models available)

Armored Thermocouple Types (Per IEC 60584/ASTM E230 Standards)

Standard Thermocouple Types

Type	Material Combination	Temperature Range	Key Characteristics	Typical Applications
K	Nickel-Chromium / Nickel-Aluminum (NiCr-NiAl)	-200~1300°C	Cost-effective, oxidation resistant	Industrial boilers, heat treatment
J	Iron / Constantan (Fe-CuNi)	-40~750°C	Good in reducing atmospheres	Plastic molding, low-temp reactors
T	Copper / Constantan (Cu-CuNi)	-200~350°C	Excellent low-temp accuracy	Refrigeration, cryogenics
E	Nickel-Chromium / Constantan (NiCr-CuNi)	-200~900°C	Highest sensitivity (62μV/°C)	Food processing, chemical pipes
N	Nicrosil / Nisil (NiCrSi-NiSi)	-200~1300°C	Better stability than K-type	Automotive exhaust, kilns

Thermocouple (Resistance) Installation Guidelines:
To ensure adequate heat exchange between the measuring end of the thermoresistor and the measured medium, the measurement point location should be selected appropriately, and installation should be avoided near valves, elbows, and dead corners of pipes and equipment.
Insertion Depth Requirements: The measuring end should have sufficient insertion depth, with the measuring end of the protective sheath extending beyond the pipeline centerline by 5–10 mm.
Insertion Direction Requirements: Ensure adequate contact between the temperature-sensing element and the medium. It is best to insert the thermocouple facing the direction of the measured medium flow or install it vertically along the pipeline.