The expansion of the bimetallic thermometer function

Bimetallic thermometer working principle is to use two different temperature expansion coefficient of metal, in order to improve the temperature measuring sensitivity, is usually made of metal spiral coil shape, when multi-layer metal temperature change, the layers of metal expansion or contraction, makes the spiral coil rolled up or loosen the permissible error are about 1% of the scale range. The thermometer and the rod of glass liquid thermometer USES similar, but can be used under the condition of higher mechanical strength. Characteristics of the scene showed temperature, intuitive and convenient safe and reliable, long life; Core-pulling thermometer can not stop short time machine maintenance or replacement. Type axial and radial type, universal type, variety complete, suitable for all kinds of the needs of the installation. The application of instrument accuracy level is 1. Level 0, instrument shell with anti-corrosion materials. Bimetallic thermometer is based on the ring around the made of bent bimetallic strip. End is heated expands, turns the pointer, the instrument will show thermoelectric potential should value. Bimetallic thermometer is mainly used in industry of components is a use two or more pieces of metal laminate composed of multilayer metal together. Can automatically continuous recording instrument temperature changes, in order to improve the temperature measuring sensitivity, is usually made of metal spiral coil shape. When multi-layer metal temperature change, the layers of metal expansion or contraction, makes the spiral coil rolled up or let go. Bimetallic thermometer is a kind of measurement in the field of low temperature test instrument. Can be directly measured in the process of various production - 80℃- Liquid + 500 ℃ range steam and gas medium temperature. Bimetallic thermometer is mainly used in industry of element is one with two or more pieces of metal laminate composed of multilayer metal together, using two different metal working in the principle of expansion degree of different temperature changes. Is based on the ring around made of bent bimetallic strip. Bimetallic thermometer application rule of homogeneous conductor rule consists of a homogeneous conductor of a closed loop, regardless of material along the length direction everywhere temperature distribution, the loop does not produce thermoelectric potential. On the other hand, if the loop in the presence of thermoelectric potential for inhomogeneous materials. Center conductor rule in the thermocouple circuit connected to the third ( Or more) Homogeneous material, as long as access to the same material on both ends of the connection point temperature, then the access of the third kind of material does not affect the thermoelectric potential of the original circuit. Rule to prove the middle temperature thermocouple circuit composed of two different material, its junction temperature t and the thermoelectric potential when t0 respectively the EAB ( t, t0) Is equal to the thermocouple in the junction temperature of ( t, tn) And ( tn、t0) Algebra and corresponding thermoelectric potential and when, tn to middle temperature.