How to order the double metal thermometer?

Bimetallic thermometer USES more and more in our daily life, whether home or industrial special thermometer thermometer, can all see it. Its working principle is to put the two pieces of expansion coefficient difference is very big pieces of metal welded together. When the temperature changes, the difference is very big, caused the different expansion coefficient of expansion and contraction, the deformation of sheet metal bending. According to different deformation and produce different momentum, momentum to drive the connection shaft and the other end of the indicating needle, indicate the temperature. In general, bimetallic thermometer order, must provide the following parameters: 1, confirm the temperature measurement range. 2, choose the dial size, usually have 60 mm, 80 mm, 100 mm, 150 mm, etc. 3, select the dial with heat pipe connections, usually with axial and radial, universal, etc. 4, confirm the diameter of the heat pipe and insertion depth. 5, confirm the fixed way of the heat pipe. Have a fixed thread, movable, card sets, flange fixed several kinds of methods, such as, according to the site conditions. 6, confirm whether there are other requirements, such as do you want to set the alarm temperature ( Electric contact bimetallic thermometer) 。 7, confirm the thread size, usually with M16 * 1. 5,M27 * 2, G1/2" 1/2" The NPT, etc.