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TEMPERATURE MEASUREMENT - Coggle Diagram
TEMPERATURE MEASUREMENT
INTRODUCTION
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In manufacturing, the product quality usually closely related with accurate measured and maintained of temperature
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TEMPERATURE SCALES
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T1/T2=Q1/Q2
T1,T2: Reservoir of heat (T1>T2)
Q1₁,Q2: Heat energy (Q₁<->Q₂)
Thermocouples remain the main temperature sensor,which half of industrial application.
Thermocouple
thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots.
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Bimetallic Thermometer.
having different coefficient of thermal expansion, joint together (welded/riveted)
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Quartz Thermometer
provides a highly accurate and sensitive method of temperature measurement based on change in resonant frequency which is directly proportional to the temperature change
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Advantages:
-Highly linear output Long-term stability and reliability
-Excellent repeatability in the measuring range of -40 to 230°C.
Limitatation:
-Limited measuring range -40 to 230°CPiezo
-electric crystals have strong cross- sensitivity for pressure changes if they occur simultaneously in the temperature measuring system