What is bimetallic thermometer?
What is bimetallic thermometer?
A bimetallic thermometer is a temperature measurement device. It converts the media’s temperature into mechanical displacement using a bimetallic strip. Bimetallic thermometers are used in residential devices like air conditioners, ovens, and industrial devices like heaters, hot wires, refineries, etc.
Where is bimetallic thermometer used?
The bimetallic thermometer is used in household devices likes oven, air conditioner, and in industrial apparatus like refineries, hot wires, heater, tempering tanks etc. for measuring the temperature.
What is the principle of bimetallic strip?
Definition: A bimetallic strip works on the principle of thermal expansion, which is defined as the change in volume of metal with the change in temperature. The bimetallic strip works on two basic fundamentals of metals.
What devices use a bimetallic strip?
Thermometer and thermostat are examples of bimetallic tip devices. (i) Thermometers: A thermometer uses a bimetallic strip, generally wrapped into a coil in its most used design. The coil changes the linear movement of the metal expansion into a circular movement due to the helicoidal shape it draws.
What is the basic principle of bimetallic thermometer?
Bimetal thermometers work on the principle that different metals expand at different rates as they are heated. By using two strips of different metals in a thermometer, the movement of the strips correlates to temperature and can be indicated along a scale.
What is called bimetallic strip?
A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated. This effect is used in a range of mechanical and electrical devices.
Why bimetallic strip is used?
A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated.
Why do bimetallic strips bend?
The strip of bimetal comprises two metals with different coefficients of thermal expansion. The metal with a higher coefficient will expand at first when heated. The expansion results in bending. Thus they bend towards the metal having a lower thermal expansion.
Which metal is used in bimetallic thermometer?
The bimetal thermometer measures by thermal expansion. A bimetal thermometer uses a bi metal spring as temperature sensing element. This technology uses a coil spring made of two different types of metals that are welded or fastened together. These metals could include copper, steel, or brass.
Are bimetallic thermometers accurate?
Bimetal thermometers are inexpensive, simple, and durable. As purely mechanical devices, they display only the current temperature on their dial. They can be accurate to about 1% full span.
What are the advantages of bimetallic thermometer?
A thermometer comparison
| advantages | disadvantages |
|---|---|
| Bimetallic thermometer * | |
| cheap | requires frequent calibration to maintain accuracy |
| durable | fairly slow response |
| can be used for thermograph |
When did the bimetallic thermometer first come out?
The company not only manufactured the world’s first steam pressure gauge, in 1924 it also invented the bimetallic thermometer. During the past year, our surveyors have uncovered a persistent problem regarding the bimetallic thermometers and improper recording of temperatures of the countermeasure and Ammunition lockers.
Who was the first person to invent the thermometer?
The first recorded thermometer was produced by the Italian Santorio Santorio (1561-1636) who was one of a group of Venetian scientists working at the end of the 16th century. As with many inventions, the thermometer came about through the work of many scientists and was improved upon by many others. 1596: Galileo Galilei & the first thermoscope
How is a bimetallic thermometer like a spiral strip?
Whenever the temperature rises, the metal strip turns in the direction of the less temperature coefficient metal. Similarly, when the temperature reduces, then the strip turns in the direction of a high-temperature coefficient metal. These thermometers are classified into two types like the spiral strip and helical type.
When was the bimetallic pressure gauge first invented?
The company not only manufactured the world’s first steam pressure gauge, in 1924 it also invented the bimetallic thermometer.