Product Details:
The armored thermocouple features flexibility, high temperature resistance, fast thermal response time, and robustness. Like industrial assembled thermocouples, it serves as a temperature measurement sensor and is typically used with display instruments, recording instruments, and electronic regulators. It can also be used as the temperature sensing element of assembled thermocouples. It can directly measure the temperature of liquids, steam, gaseous media, and solid surfaces within the range of 0°C to 800°C in various production processes, and should comply with the GB/T18404-2001 standard.
□ Working Principle
The working principle of the armored thermocouple is that two conductors of different compositions are welded at both ends to form a loop. The direct temperature measurement end is called the measuring end, and the wiring end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current is generated in the loop. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric electromotive force generated by the thermocouple.
The thermoelectric electromotive force of the armored thermocouple increases with the temperature rise of the measuring end. The magnitude of the thermoelectric electromotive force depends only on the material of the armored thermocouple conductors and the temperature difference between the two ends, and is independent of the length and diameter of the thermoelectrodes.
The structure of the armored thermocouple consists of conductors, insulating magnesium oxide, and a 1Cr18Ni9Ti stainless steel protective tube, formed through multiple drawing processes. The armored thermocouple product mainly consists of a junction box, terminal blocks, and the armored thermocouple as the basic structure, equipped with various installation and fixing devices.
Armored thermocouples are divided into insulated type and grounded type.
□ Main Technical Indicators
Temperature Measurement Range and Accuracy
|
Type |
Code |
Graduation |
Sheath Outer Diameter mm |
Common Temperature °C |
Maximum Operating Temperature °C |
Allowable Deviation Δt |
|
|
Measurement Range °C |
Tolerance Value |
||||||
|
Nickel-Chromium / Copper-Nickel |
WREK |
E |
≥Φ3 |
600 |
700 |
0～700 |
±2.5°C or ±0.75%t |
|
Nickel-Chromium / Nickel-Silicon |
WRNK |
K |
≥Φ3 |
800 |
900 |
0～900 |
±2.5°C or ±0.75%t |
