Armored thermocouple

Anti-spray	Waterproof	Round plug/socket	Flange connector	Handle	Compensating conductor wire

The working principle of installing a thermocouple involves welding two conductors with different compositions at both ends to form a closed loop. The directly measuring end is called the active end, while the terminal with the connecting wires is called the cold junction, also known as the reference end. When there is a temperature difference between the active end and the reference end, a thermal current is generated in the loop. By connecting a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

The electromotive force (EMF) of the armored thermocouple increases with the rise in the measuring end temperature. The magnitude of the EMF is solely dependent on the material of the thermocouple conductors and the temperature difference between the two ends, and is unrelated to the length or diameter of the thermoelectric rods.

The structure principle of the armored thermocouple is that it is formed by conducting wire, high-insulation magnesia, and an outer 1Cr18Ni9Ti stainless steel sheath, which are pulled together integrally multiple times. The basic structure of the armored thermocouple product mainly consists of a terminal box, terminal connector, and the armored thermocouple itself, complemented by various installation and fixing devices.

Armored thermocouples are available in two types: insulated and grounded.

Basic Technical Specifications

Note: 1. "t" refers to the absolute value of the temperature being measured.
2. T-type graduation products require consultation with the manufacturer for ordering.

Clad thermocouple thermal response time

At a step change in temperature, the time it takes for the thermocouple's output to change to 50% of that step is known as the thermal response time, represented by τ0.5.

Insulated Resistance

At an ambient air temperature of 20±1.5°C and a relative humidity not exceeding 80%, the insulation resistance between the thermocouple wire and the sheath of the insulated armored thermocouple should comply with the specifications in the following table.

Flexible

The bendable radius of the armored thermocouple is not less than 5 times its outer diameter.

Sheathed thermocouple thermal response time

Armored thermocouple standard specifications for outer diameter and nominal length

Note: 1. The nominal total length L of the insulated armored thermocouple with diameter 3, shall not exceed 10,000mm.
2. For铠装热电偶withouter diameter d≤5mmandproducts with splash-proof or waterproof junction boxes, please note during installation that the exposed part of the thermocouple must be supported by brackets or other auxiliary supports to increase rigidity and ensure stability, preventing the junction box from swinging back and forth and damaging the thermocouple.

Structure

Structured form of armored thermocouple material

Work End (Hot End) Structure

Installation Fixed Type

The fixed installations are for user installation. Besides products without fixed installations, the armored thermocouple fixed installations include four structural forms: fixed sleeve type, movable sleeve type, fixed flange, and movable flange. The fixed sleeve type allows for a one-time installation, while the movable sleeve type allows for multiple installations.

Note: Specifications within parentheses are generally not used; please place special order for these.

Sheathed thermocouple free end (terminal box) style

Terminal boxes are used for connecting the free ends of thermocouples to display instruments. They are currently available in various types, including simple, splash-proof, waterproof, handle-type, small terminal box, and compensating conductor styles.

Compensating conductor type

Splashproof

Waterproof

Handle-style

Mini junction box

Unfixed sheathed thermocouple

Note: Tube Outer Diameter d (mm): 3, 4, 5, 6, 8

Fixed bushing threaded type armored thermocouple

Note: Tube outer diameter d (mm): φ3, φ4, φ5, φ6, φ8.

Removable bushing thread-type armored thermocouple

Note: Tube outer diameter d (mm): φ3, φ4, φ5, φ6, φ8.

Model #387 and #388 tubes have an outer diameter of φ3, φ4mm.

Fixed flange type armored thermocouple assembly

Note: Tube outer diameter d (mm): φ3, φ4, φ5, φ6, φ8.

Removable sleeve type armor thermocouple with flange mounting

Note: Tube outer diameter d (mm): φ3, φ4, φ5, φ6, φ8.