High-temperature resistant wire: What is a compensating wire?

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1 Structure and definition

Thermocouple compensation wire is abbreviated as compensation wire, which is usually composed of compensation wire alloy wire, insulation layer, sheath, and shielding layer. Within a certain temperature range (including normal temperature), a pair of insulated wires with the same nominal value of the thermoelectromotive force of the matched thermocouple, use them to connect the thermocouple and the measuring device to compensate them and the thermocouple The error caused by the temperature change at the connection. To

The use of compensation wires between the thermocouple and the measuring device has two advantages: 1. Improve the physical and mechanical properties of the thermocouple temperature measurement circuit. The use of multi-stranded cores or small-diameter compensation wires can improve the flexibility of the circuit. It is a wiring Convenient, can also adjust the line resistance or shield the external interference; 2. Reduce the cost of the measurement line, when the thermocouple is far away from the measuring device, the use of compensation wires can save a lot of thermocouple materials, especially when using precious metal thermocouples, economic benefits More obvious. To

2 Terms and symbols

2.1 Extended compensation wire

The extension type compensation wire is also called the extension type wire. The nominal chemical composition and the nominal value of the thermoelectromotive force of the alloy wire are the same as those of the thermocouple. It is indicated by the letter "X" attached to the thermocouple index number, such as "KX" Indicates extended compensation wire for K-type thermocouple.

2.2 Compensation type compensation wire

Compensation type compensation wire is also called compensation type wire. The nominal chemical composition of its alloy wire is different from that of the matched thermocouple, but its thermoelectromotive force value is at 0-100℃ or 0-200℃. The weighing value is the same, and the letter "C" is attached to the thermocouple index number to indicate, for example, "KC". Different alloy wires can be applied to thermocouples with the same graduation number, and are distinguished by additional letters, such as "KCA" and "KCB". Not much currently used. To

2.3 Tolerance

The tolerance of the thermocouple compensation wire is the maximum deviation caused by the compensation wire used in the measurement system. This value is expressed in microvolts. The tolerance is divided into two types: precision and ordinary. To

2.4 Symbol

S-indicates that the thermoelectric characteristics are precision-level compensation wires. Letters are not marked for ordinary compensation wires;

G——means general compensation wire;

H——Indicates compensation wire for heat resistance;

R-indicates that the core is a multi-strand compensation wire. Compensation wires with single-stranded cores are not marked with letters;

P——represents the compensation wire with shielding layer;

V——indicating that the insulating layer or sheath is made of polyvinyl chloride material (PVC);

F——indicating that the insulating layer is made of polytetrafluoroethylene;

B-indicates that the sheath is made of alkali-free glass filament material.

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