Definition temperature is the degree of sensible heat or cold expressed in terms of a specific scale.
Temperature measuring devices ppt.
Mechanical devices liquid in glass thermometers bimetallic strips bulb capillary pressure type etc 2.
Resistance temperature relationship of metals.
Several scales and units exist for measuring temperature the most common being celsius fahrenheit and especially in science kelvin.
Temperature measurement presented by.
Mechanical thermometers can be constructed which use liquids solids or even gases as the temperature sensitive material.
In today s presentation of temperature measuring instruments we will discuss some of the keypoints and types of thermometers used for temperature measurement moreover we are highlighting the working principles of the instruments and how they are different from each other.
Temperature measurement 1 0 introduction temperature measurement in today s industrial environment encompasses a wide variety of needs and applications.
The relative change in resistance temperature coefficient.
Temperature measurement ppt 1.
There are four basic types of temperature measuring devices each of which uses a different principle.
Various units of temperature measurement c degrees celsius or centigrade f degrees fahrenheit k kelvin r rankine relationship between different units c f 32 1 8 f 1 8 x c 32 k c 273 15 r f 459 67 conversion tables or software can be utilized to facilitate with converting between these units.
Thermoresistive rtds and thermistors 4.
To meet this wide array of needs the process controls industry has developed a large number of sensors and devices to handle this demand.
Mechanical temperature measuring devices principle of operation a change in temperature causes some kind of mechanical motion typically due to the fact that most materials expand with a rise in temperature.
Common rtd sensing elements constructed of platinum copper or nickel have a repeatable resistance versus temperature relationship r vs t and operating temperature range the r vs t relationship is defined as the amount of resistance change of the sensor per degree of temperature change.
So that we can easily use it to measure high temperatures.
But these are not so accurate like electrical devices such as thermocouple.
Accurate temperature measurement devices are critical for ensuring the safety of meat products.
Radiative infrared and optical pyrometers.
Calibration of temperature measurement devices is one of the most important verification activities a meat or poultry processor can perform.
This device can measure temperature from 80 o c to 600 o c.
Selection and maintenance of temperature measurement devices kevin keener ph d p e.
Introduction temperature heat scale glass thermometer bi metallic thermometer rtd thermocouple thermistor ic sensor how to choose 3.
