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Chapter 2 Exercise

Chapter 2 Exercise. Thermistor. Also called thermal resistor as the resistance varies as a function of temperature. Manufactured in the form of beads, discs and rods. Most thermistors have a negative coefficient (NTC) of temperature resistance. Three important characteristics:

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Chapter 2 Exercise

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  1. Chapter 2 Exercise Thermistor • Also called thermal resistor as the resistance varies as a • function of temperature. • Manufactured in the form of beads, discs and rods. • Most thermistors have a negative coefficient (NTC) of • temperature resistance. • Three important characteristics: • Resistance – Temperature • Voltage – Current • Current – Time

  2. Thermistor

  3. Thermistor

  4. Thermistor • Major applications of thermistors are measurement and control of temperature. • Other applications of thermistors: • Measurement of power at high frequencies. • Measurement of thermal conductivity. • Measurement of level, flow and pressure of liquids. • Measurement of composition of gases. Vacuum measurement.

  5. Thermistor • Limitations • Characteristics of resistance are non-linear. • Not recommended for wide temperature range application. • Need a shielded power • lines or filters and low • excitation current. • Advantages • High sensitivity especially in NTC region. • Fast response over narrow temperature range. • Cold junction compensation is not • required. • No problems on contact and lead resistance. • Low cost and small size.

  6. Thermistor – Exercise Question

  7. Thermistor – Exercise Question

  8. Thermistor –Exercise Question

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