Temperature Measurement

Jul 25th, 2016
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Temperature Measurement - Convert Temperature ...

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Chapterp5TEMPERATURE MEASUREMENTINTRODUCTIONWhat is Temperature?Temperaturepis defined as the degreegof hotness or coldnessmeasured on a definite scale. Hotness and coldness are the resultof molecular activity. As the molecules of a substance move faster,the temperaturepof that substance increases.What is Heat?gy and is measured in calories or BTU'sHeat is a form of energy(British Thermal Units).Why temperature is measured as a process variable?There are changes in the physical or chemical state of mostsubstances when they are heated or cooled. Themeasurement of temperature is also important for protectionof the equipment, as uncontrolled high or low temperaturescan cause structural deterioration of pipelines and vessels.Heat TransferThe flow of heat is transferred in three ways: convection, conduction,and radiation.a)) CConductiond ti When heat is applied to one part of a substance, it is transferred to allparts of the substance. The movement is from molecule to molecule.pGases and liquids are poor conductors. The flow of heat by conductiontakes place most effectively in solids.b) ConvectionHeat transferred by the actual movement of portions of a gas or liquid from one placeto another is called convection. This movement is caused by changes in density dueto rising temperattemperature.re For example,e ample in a forced air heating ssystem,stem the warmarm airentering the room through the supply

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