In the regulation of heating and cooling, thermostats that operate over a wide range of temperatures are used. In these, one end of the bimetallic strip is mechanically fixed and attached to an electrical power source, while the other (moving) end carries an electrical contact. Free Next Day Delivery.
A thermostat has important main components. How does a bimetal thermometer work? What is a bimetal thermometer?
The little device that makes this possible is the bi-metal , or defrost, thermostat. It is called a bi-metal thermostat because at its heart is a strip made of two metals with different expansion rates, which when heated begins to curve. This switch operates the heater. The strip works as a bridge in an electrical circuit connected to your heating system.
Normally the bridge is down, the strip carries electricity through the circuit, and the heating is on. You will often find long bimetallic strips coiled into spirals. By coiling a very long strip it becomes much more sensitive to small temperature changes. In a furnace thermostat , the same technique is used and a mercury switch is attached to the coil.
The switch turns the furnace on and. In one form, the mechanical thermostat , a bimetallic strip in the form of a coil directly operates electrical contacts that control the heating or cooling source.