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FUNCTION
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| Thermostat is a device which is used to maintain a desired temperature in a system like refrigerator, air-conditioner,iron and in a number of devices. | ||||
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PRINCIPLE
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Thermostat works on the principle of thermal expansion of solid materials. | |||
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CONSTRUCTION
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| A bimetallic thermostat device consists of a strip of two different metals having different coefficients of linear expansion. | ||||
| The bimetallic strip works as an electric contact breaker in an electric heating circuit. The circuit is | ||||
| broken when the desired temperature is reached. | ||||
| Due to difference in the coefficients of linear expansion of two metals, The bimetallic strip bends in the | ||||
| form of a downward curve and the circuit is broken. The metallic strip is in contact with a screw 'S'. | ||||
| When it becomes hot, bends downward and contact at 'P' is broken. Thus the current stops flowing | ||||
| through the heating coil. When the temperature falls, the strip contracts and the contact at 'P' is | ||||
| restored. | ||||
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USES
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| Bimetallic thermostats are widely used in numerous appliances such as refrigerator, airconditioner, Iron, ice plants etc. | ||||
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