Do you know about - Bimetallic Thermometer
Laboratory Results! Again, for I know. Ready to share new things that are useful. You and your friends.Construction:
The bimetallic thermometer consists of a bimetallic strip by bonding together two thin strips of two dissimilar metals. The differential change in expansion of the two metals results in bending of the bimetallic strips with change in temperature.
How is Bimetallic Thermometer
Working:
The bimetallic strip has one end fixed and the climatic characteristic changes causes the free end to deflect. The range of linear association between deflection and climatic characteristic depends on the compound of metal used. Invar alloy is a low expansion material. The other metals used can be steel, monel and brass.
The deflection of the free end is directly proportional to the climatic characteristic change and the distance of the strip and is inversely proportional to the thickness of the strip.
If one end is fixed, the deflection of the free end is direct indication of the climatic characteristic measured. The sensitivity of the thermometer is increased by expanding the distance of the bimetallic strip.
The size pf the thermometer can be made small by having the bimetallic strip arranged as the circular spiral or as an helix.
The climatic characteristic range that can be measured is -40 degree Celsius to +550 degree Celsius. The accuracy is within +or-0.5% to +or-2%.
Uses:
used in ambient climatic characteristic measurement devices.
Used to air-conditioning thermostats
Used in oil refineries.
used in Tyre Vulcanizers.
Used in hot work wire heaters.
Used in tempering tanks.
Advantages
Simple, robust and inexpensive.
It has good accuracy.
It can part climatic characteristic in the range of (-40 to 550) in Celsius.
It can withstand 50% overage climatic characteristic measurement.
Disadvantages
Not recommended for measurement of climatic characteristic above 550 degree Celsius.
The metals undergo permanent warp distortion.
Usage is little to local mounting.
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