Temperature Measuring Devices Ppt

Introduction temperature heat scale glass thermometer bi metallic thermometer rtd thermocouple thermistor ic sensor how to choose 3.

Temperature measuring devices ppt.

Selection and maintenance of temperature measurement devices kevin keener ph d p e. This device can measure temperature from 80 o c to 600 o c. Thermoresistive rtds and thermistors 4. The relative change in resistance temperature coefficient.

Calibration of temperature measurement devices is one of the most important verification activities a meat or poultry processor can perform. Avishek kumar 13 ei 08 2. Resistance temperature relationship of metals. Temperature measurement presented by.

To meet this wide array of needs the process controls industry has developed a large number of sensors and devices to handle this demand. Temperature measurement ppt 1. There are four basic types of temperature measuring devices each of which uses a different principle. Definition temperature is the degree of sensible heat or cold expressed in terms of a specific scale.

Radiative infrared and optical pyrometers. Accurate temperature measurement devices are critical for ensuring the safety of meat products. The main advantage of this device is it does not use any power source for their operation. Temperature measurement devices ppt.

Several scales and units exist for measuring temperature the most common being celsius fahrenheit and especially in science kelvin. 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. 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. But these are not so accurate like electrical devices such as thermocouple.

Mechanical thermometers can be constructed which use liquids solids or even gases as the temperature sensitive material. Mechanical devices liquid in glass thermometers bimetallic strips bulb capillary pressure type etc 2. 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.