Bimetal
Thermometers
Bimetal thermometers are extremely simple in their construction and are as
such widely used in industrial applications. In these instruments, temperature
measurement is made by means of a bimetal sensor. The bimetal consists
of two inseparably joint, metal strips, the coefficient of thermal expansion of
each being different from the other. The strips are wound into a spiral coil,
one end of which is fixed and the other is connected to the pointer axis. Any
temperature variation, influences the bimetal in such a way, as to rotate the
axis of the pointer. This rotation of the pointer is used to indicate the
temperature on a dial scale. Bimetal thermometers, being dry systems, are
used extensively for hygienic applications, as they are free from any
contaminating fluids. |
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