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TEMPERATURE MEASUREMENT - Coggle Diagram
TEMPERATURE MEASUREMENT
Bimetallic Thermometer
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Example;oven,electric iron and refrigerators
Thermocouple
temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots
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used as a gas turbine exhaust,diesel engines and as flame sensors in safety devices
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Disadvantages
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The output signal,emf requires amplification in most applications
Inhomogencity of composition of the thermocouple material and cold working or wires effect the sensitivity of the thermocouple
Base metal
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More sensitive,cheaper & nearly linear characteristic
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Rare metal
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Platinum up to 1600 C,others up to 3000 C
Quartz thermometer
A highly accurate and sensitive method of temperature based on the change in its resonant frequency which is directly proportional to the temperature change
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Limitations
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Piezo(electric crystals have strong cross sensitivity for pressure changes if they occurs simultaneously in the temperature measuring system
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