How is the bimetallic thermometer is a temperature measurement?

Bimetallic thermometer using bimetallic strip of two kinds of combination of different measured temperature of the expansion coefficient of the metal. Bimetallic strip has two layers of different expansion coefficient of metal ( Or alloy) Each other firmly with the combination of the material, the large expansion coefficient for the active layer, ho, expansion coefficient for the passive layer, one end of the bimetallic strip is fixed, when the temperature effect, the active layer due to the expansion coefficient is greater than the passive layer, and because of the two materials solid combination together, thus active free elongation was passive layer of traction, the freedom of the passive layer elongation stretched by the active layer, the combination of moment bimetallic strip bending. The curvature and the size and the physical properties of the bimetallic strip, two layers of metal thickness, are related to temperature, when the bimetallic strip thickness of the material physical properties, two layers of metal than fixed after bending rate is only related to the temperature change. Common bimetallic thermometer is as follows: model: A500C - 1 ( WSS4B825150) Type: hot shell bimetallic thermometer structure: universal type cover circle: flange type, tray type panel material: stainless steel SS304 tooth head: 1/2 & quot; NPT other optional surface diameter: 120 mm heat pipe diameter: 6. 35 mm heat pipe length: 150 mm ( 50 - Optional) around 2000 mm. Temperature range: 0 - 150C ( Can be customized) Accuracy: & plusmn; 1. Table: 5% glass protection grade: IP65 ( Dust, water)