What is a Bimetallic Dial Thermometer?

A bimetallic dial thermometer is basically a measuring element that consists of two, metal tapes, joined together. Tapes with different thermal expansion coefficients. The coiled measuring element is fixed at the end of the stem; The other side is attached to a pointer axle. Temperature changes cause the bi-metal to stretch or bend, causing the coiled component to twist. This movement is proportional to the temperature change and is shown on the dial. Bi-metal dial thermometers are used for temperatures ranging from – 50°C to +500 C. The accuracy is ± 1,6% of full scale deflection.