TEMPERATURE

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TEMPERATURE
SENSOR
Reported by
Stephanie Rose T. Bumanglag
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Temperature Sensors

• devices /instruments use to measure the
• degree of hotness or coldness of a body
• or environment

• detects the measurement of the
• temperature

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Two Kinds of Temperature Sensor

• Contact Temperature Sensor
• Non-Contact Temperature
• Sensor

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Contact Temperature Sensor

• measures its own temperature
• brings into contact with the
• substance whose temperature is
• to be measured

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Types of Contact Temperature Sensor

• Thermocouples

• Thermistors

• Liquid-in-Glass Thermometer

• Resistance Temperature
• Detectors (RTD)

• Semiconductor Temperature
• Sensor

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Thermocouples

• a simple device being only two wires
• joined together at the measuring
• end

• the oldest and still the most
• industrial thermometer

• its origin can be traced back to Thomas
• Seebecks 1822 report of the Seebeck
• effect

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Thermocouple

• capable of measuring temperature
• directly as high as 1800C

• may be flexible, rugged, and generally
• easy to handle but operation is complex
• with many potential sources of error

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Thermistors

• a semiconductor material with highly
• temperature sensitive electrical
• resistance

• mixture of metal oxide semiconductor
• materials

• typically works over a relatively small
• temperature range

• very accurate and precise within that range

• smaller, faster, more rugged and
• inexpensive

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Liquid-in-Glass Thermometer

• simply the ones used to check fever

• the sensor one visualizes most for
• temperature measurement

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Resistance Temperature Detectors (RTDs)

• are wire wound and thin film devices that
• work on the physical principle of the
• temperature coefficient of electrical
• resistance of metals.

• are nearly linear over a wide range of
• temperatures

• have been made from a variety of metals,
• the most popular of which were copper,
• nickel, and nickel iron alloys

• are inexpensive, stable, reliable, small, fast,
• and accurate

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Semiconductor Temperature Sensor

• are usually produced in the form of
• ICs, Integrated Circuits.

• fundamental design results from the fact
• that semiconductor diodes have voltage-
• current characteristics that are
• temperature sensitive which means that
• semiconductor triodes or transistors are
• also temperature sensitive.

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Non-Contact Temperature Sensor

• Radiation Thermometer

• Optical Pyrometer

• Fiber Optic Temperature Sensor