Temperature sensor and its applications
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16-02-2010, 03:36 PM

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19-06-2013, 12:09 PM

Temperature Sensors

.pptx   Temperature Sensors[.pptx (Size: 229.32 KB / Downloads: 13)

Types of Temperature Sensors

Resistance Temperature Detectors (RTDs)


Two wires of different metal alloys.
Converts thermal energy into electrical energy.
Requires a temperature difference between measuring junction and reference junction.
Easy to use and obtain.

Thermocouple Applications

Plastic injection molding machinery
Food processing equipment
Semiconductor processing
Heat treating
Medical equipment
Industrial heat treating
Packaging equipment

Resistance Temperature Detectors (RTDs)

Wire wound and thin film devices.
Nearly linear over a wide range of temperatures.
Can be made small enough to have response times of a fraction of a second.
Require an electrical current to produce a voltage drop across the sensor


A semiconductor used as a temperature sensor.
Mixture of metal oxides pressed into a bead, wafer or other shape.
Beads can be very small, less than 1 mm in some cases.
The resistance decreases as temperature increases, negative temperature coefficient (NTC) thermistor.

Semiconductor Applications

Hard Disk Drives
Personal Computers
Electronic Test Equipment
Office Equipment
Domestic Appliances
Process Control
Cellular Phones


In this application note , the concept and usage of different temperature sensors are discussed . Among these temp. sensors
1. Thermocouple gives the fastest response to temp. change
2. RTD is most suitable over time , most accurate temp. sensor.
3. Thermistor has the highest sensitivity to small temp. change.

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