Bimetallic thermometer with power supply?

Bimetallic thermometer is a kind of mechanical thermometer, its working principle is to use different expansion coefficient of two kinds of metals ( Or alloy) Piece together form a thermal components, generally made spiral wound, its one end fixed and the other end ( The free end) Equipped with a pointer. When the temperature changes, the thermal component of curvature change, free end rotation, drive the pointer indicates the temperature value on the dial. Bimetallic thermometer by pointer, casing, metal protection tube, pointer shaft, bimetallic temperature sensing element, the fixed end, dial, etc. Parts. During operation without using power to measure the temperature of the medium, has a long service life, safety mercury-free harm etc. , are widely used in the scene. When ordering, you need to provide the parameters are: surface diameter, installation direction, thread specifications, the sheath maerial of diameter, length of sheath maerial and temperature range, etc.