Knowledge of compensating wires for industrial thermocouples
Here to tell you about industrial thermocouple compensation wire knowledge? In the case of
First, the industrial thermocouple compensation principle and role
Industrial thermocouple compensation wire referred to as compensation wire, usually by the compensation wire alloy wire, insulation, sheath, shield composition. In a certain temperature range (including room temperature), with a matching thermocouple of the thermoelectric power of the same nominal value of a pair of insulated layers of the wire, with them connected to industrial thermocouple and measuring devices to compensate for their Errors in temperature changes at industrial thermocouple junctions.
Second, the industrial thermocouple and measuring device between the use of compensation wire, the following two benefits:
1, to improve the industrial thermocouple temperature circuit physical and mechanical properties, the use of multi-strand core or small diameter compensation wire can improve the flexibility of the line is easy to connect, but also adjust the line resistance or shielding external interference;
2, reduce the cost of measuring the line, when the industrial thermocouple and measuring device is far away, the use of compensation wire can save a lot of industrial thermocouple materials, especially the use of precious metal industrial thermocouple, the economic benefits more obvious.
Third, the nature of the compensation wire classification
1, extended type compensation wire
The extension of the type of wire, also known as the extension of the wire, the nominal chemical composition of the alloy wire and thermoelectromotive force nominal value and the use of the same industrial thermocouple, with the letter "X" attached to the industrial thermocouple sub-number, said, KX "means K-type industrial thermocouple with extended compensation wire.
2, compensation type compensation wire
Compensation type compensation wire, also known as compensation type wire, the nominal chemical composition of the alloy wire with the use of industrial thermocouple is different, but the thermal dynamic value of 0-100 ℃ or 0-200 ℃ with the use of industrial thermocouple heat The nominal value of the electromotive force is the same and is indicated by the letter "C" after the industrial thermocouple scale number, for example "KC". Different alloy wires can be applied to industrial thermocouples of the same degree of division and are distinguished by additional letters such as "KCA" and "KCB". Not much use at present.
3, compensation wire tolerance
The tolerance of the industrial thermocouple compensation wire is due to the maximum deviation caused by the compensation conductor in the measurement system. The value is expressed in microvolts. The tolerance is divided into two types: precision and normal.
