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CONTROL SYSTEMS AND INSTRUMENTATION - Coggle Diagram
CONTROL SYSTEMS AND INSTRUMENTATION
Introduction
Temperature is most widely measured quantity in process industry
Scales
Fahrenheit
Celcius
Carnot Cycle
T1/T2=Q1/Q2
Method measurement and Sensing techniques
Non-electrical
Change in Physical Dimensions
Liquid-in-glass thermometers
Bitmetallic thermometers
Change in gas/vapor pressure
Constant volume gas thermometers
Pressure thermometers
Chnages in chemical phase
Fusible pyrometer
Liquid crystal
Electrical
Change in electrical properties
Resistance thermometers
Thermistors
Thermocouples
Remain the main temperature sensor
Consisting of two dissimilar conductor that contact each other at one or more spots
Quartz thermometers
Change in its resonant frequency which is directly proportional to the temperature change
Semiconductor junction technology
Diodes
Intergrated circuits
Radiation
Changes in emitted radiation
Total radiation
Infrared pyrometer
