What circumstance with sheath bimetallic thermometer need?

Working principle of the bimetallic thermometer is the use of two different metal elements in the principle of expansion degree of different temperature changes. Bimetallic thermometer is mainly used in industry of element is one with two or more pieces of metal laminate composed of multilayer metal together, 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, because the end fixed and the other end of the spiral coil and a free rotating pointer is linked together, therefore, when the bimetallic strip feel the temperature change, Pointers can be on a circular dividing scale to indicate the temperature. Our common bimetallic thermometer is often used with bimetallic thermometer sheath, so what circumstances bimetallic thermometer to match jacket to you? As we all know, bimetallic thermometer field widely used, industrial equipment, pipelines, power plants, petrochemical industry, heating systems, can get on the ship. On the basis of the using range of the bimetallic thermometer parameters and material will have a corresponding adjustment. Such as material with copper, SS304 and SS316; And temperature range is also can customize according to the environmental temperature of using the site; The use and installation environment is also each are not identical. Bimetallic thermometer sheath can solve the problem of installation, on the one hand, on the other hand, can also be for bimetallic thermometer heat pipe protection. So generally meet the following two cases will need to use bimetallic thermometer sheath. One is the need to install the bimetallic thermometer in large equipment. Another is the pressure when the bimetallic thermometer work environment after more than 40 kg ( Easy to cause the heat tube and joint welds of desoldering easier to happen) 。