The classification of the compensating conductor and working principle

When we use the number K dividing compensating lead wires with N index number of thermocouples, will cause over compensation, according to the temperature on the high side; On the other hand, with N index number compensating lead wires with K index number of thermocouples, will cause less compensation, according to low temperature.

a, classification and principle of compensation conductor should be

in a certain temperature range, the thermocouple thermoelectric performance of the thermoelectric performance of which is similar of conductor is called a thermocouple compensating lead wires.

the thermocouple temperature rule among, thermocouple temperature measurement circuit, the total potential value related to the hot end and the temperature at the reference only, and not affected by the intermediate temperature change.

2, the classification of the compensating conductor

from the compensation accuracy of general grade and precision, precision grade compensation error generally only half of the regular grade, usually used in measuring accuracy is higher. Such as # S, R dividing compensating lead wires, the precision level of tolerance for & plusmn; 2. 5 ℃, common tolerance for & plusmn; 5. 0℃; K, N dividing compensating lead wires, precision level of tolerance for & plusmn; 1. 5 ℃, common tolerance for & plusmn; 2. 5℃。 O levels in models are not standard, the precision level & # 39; 年代 Said.

points from the principle of extended model and compensation model, extended the wire type in the name of the chemical composition is the same as the blending of the thermocouple, and the thermoelectric potential, same in model & # 39; X ' Said the compensation type the name of the wire of the chemical composition and thermocouple are different, but in its working temperature range, the thermoelectric potential and with thermocouple thermoelectric potential of nominal value, in the model & # 39; C' Said.

from the working temperature points and is commonly used in heat-resistant, generally with the working temperature of 0 ~ 100 ℃ ( A few of 0 ~ 70 ℃) ; Heat with the working temperature of 0 ~ 200 ℃.

in addition, can be divided into single and multiple core wire core how much ( Soft line) Compensation conductor to whether or not to bring a shielding layer is divided into regular and shield type compensation conductor, and dedicated to the explosion-proof intrinsically safe circuit with compensating lead wires.

a few problems in the application:

compensation conductor should be matched with thermocouple

all kinds of index number compensating lead wires with the same degree of thermocouples, otherwise may owe compensation or over-compensation, commonly used thermocouple at 100 ℃ and 200 ℃ when see you need to compensate the thermoelectric potential value of the

the commonly used thermocouple at 100 ℃ and 200 ℃ when the thermoelectric potential value, so the available match the thermocouple material compensating lead wires to replace the need to extend the precious thermocouple materials, will reference comprised thermocouple junction box to display device terminal, by compensating conductor on the original reference temperature compensation. Compensation conductor besides can reduce error of measurement, still has the following advantages: can improve the physical properties of the thermocouple temperature measurement circuit and mechanical properties, such as using multi-strand wire core or to compensate for small diameter wire and can improve the flexibility of circuit, make the connection is convenient, also easy to shield interference; Which can reduce the cost of measuring circuit.