Selection and maintenance of temperature measurement devices kevin keener ph d p e.
Temperature measuring devices ppt.
But these are not so accurate like electrical devices such as thermocouple.
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.
Temperature measurement 1 0 introduction temperature measurement in today s industrial environment encompasses a wide variety of needs and applications.
Radiative infrared and optical pyrometers.
Several scales and units exist for measuring temperature the most common being celsius fahrenheit and especially in science kelvin.
Temperature measurement devices ppt.
There are four basic types of temperature measuring devices each of which uses a different principle.
Resistance temperature relationship of metals.
Accurate temperature measurement devices are critical for ensuring the safety of meat products.
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.
Introduction temperature heat scale glass thermometer bi metallic thermometer rtd thermocouple thermistor ic sensor how to choose 3.
Avishek kumar 13 ei 08 2.
So that we can easily use it to measure high temperatures.
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 presented by.
Thermoresistive rtds and thermistors 4.
Calibration of temperature measurement devices is one of the most important verification activities a meat or poultry processor can perform.
Definition temperature is the degree of sensible heat or cold expressed in terms of a specific scale.
The main advantage of this device is it does not use any power source for their operation.
Mechanical thermometers can be constructed which use liquids solids or even gases as the temperature sensitive material.
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.
Mechanical devices liquid in glass thermometers bimetallic strips bulb capillary pressure type etc 2.
To meet this wide array of needs the process controls industry has developed a large number of sensors and devices to handle this demand.
