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TEMPERATURE MEASUREMENT - Coggle Diagram
TEMPERATURE MEASUREMENT
INTRODUCTION
TEMPERATURE IS MOS WIDELY MEASURED QUANTITY IN PROCESS INDUSTRT
IMPORTANT PARAMETER IN THERMODYNAMIC
AND HEAT TRANSFER PROCESS
THE LAW IS ZEROTH LAW OF THERMODYNAMIC
: :
TEMPERATURE - SENSING TECHNIQUES
PHYSICAL DIMENSIONS
BIMETALLIC THERMOMETER (NON ELECTRICAL)
USE THE PRINCIPAL OF SOLID EXPANSION AND CONSISTS OF A BIMETAL STRIPS IN THE FORM OF CANTILEVER BEAM
TWO METAL HAVE DIFFERENT COEFFICIENT OF THERMAL EXPANSION, JOIN TOGETHER TO PREVENT THE RELATIVE MOTION BETWEEN IT
INVAR : LOW EXPANSION METAL
BRASS: HIGH EXPANSION METAL
REAL WORLD APPLICATION SUCH AS THERMOSTAT IN AIR CONDITIONER
FUNCTION BETWEEN -30 TO 550 DEGREE CELCIUS
ELECTRICAL PROPERTIES
THERMOCOUPLES
TEMPERATURE-MEASURING DEVICE CONSISTING OF TWO SIMILAR CONDUCTORS THAT CONTACT EACH OTHER AT ONE SPOT OR MORE
PRODUCE VOLTAGE WHEN TEMPERATURE ON ONE SPOT IS DIFFERENT
WIDELY USE AS TEMPERATURE MEASUREMENT FOR GAS TURBINE EXHAUST AND DIESEL ENGINES
MATERIAL FACTOR
ABILITY TO WITHSTAND TEMPERATURE WHEN USED
IMMUNITY TO CORROSION
LINEARITY CHARACTERISTIC
ATTACHED IN PARALLEL OR SERIES (THERMOPILE) TO INCREASE ITS SENSITIVIY
QUARTZ THERMOMETER
MORE ACCURATE AND SENSITIVE BASED ON THE CHANGE IN ITS RESONANT FREQUENCY WHICH IS DIRECTLY PROPORTIONAL TO THE TEMPERATURE CHANGE
1 Hz : 0.001 DEGREE CELCIUS
RANGE -40 TO 230 DEGREE CAN BE MEASURED ACCURATELY
CUT IN THE FORM OF SHEAR TYPE LC (LINEAR COEFFICIENT) CUT
