Are bimetal thermometers accurate?
Bimetal thermometers use two strips of different metals to convert temperature into mechanical displacement. ... As purely mechanical devices, they display only the current temperature on their dial. They can be accurate to about 1% full span.
A traditional thermostat has two pieces of different metals bolted together to form what's called a bimetallic strip (or bimetal strip). ... When the strip gets hot, one of the metals expands more than the other so the whole strip bends very slightly. Eventually, it bends so much that it breaks open the circuit.
Bimetal temperature gauges operate with a measuring system in the form of a helical or spiral tube. The measuring system consists of two sheets with different expansion coefficients, which are inseparably joined. ... If one end of the bimetal measuring system is firmly clamped, the other end will rotate the pointer shaft.
