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• • . • • Thermistors Thermistors are semiconductors made of ceramic materials that are thermal resistors with a high negative temperature coefficient. That is opposite to the way metals react to such changes. The resistivity of thermistor semiconductors used for biomedical applications is between 0.1 and 100 m. The empirical relationship between the thermistor resistance Rt and absolute temperature Tin kelvins (K) is: R=RoeB(T-T)/TTo] β == material constant for thermistor, K To standard reference temperature, K απ R₁ dT 1 dR₁ = (%/K) The temperature coefficient can be found by differentiating with respect to Tand dividing by Rt. Thus В That a is a nonlinear function of temperature. Dr. Shamekhi, Sahand University of Technology 36 Temperature Measurements - Thermistors p2 • Advantages: - - These devices are small in size (they can be made less than 0.5 mm in diameter) - Have a relatively large sensitivity to temperature changes Excellent long-term stability characteristics (±0.2% of nominal resistance value per year). • Disadvantages: - - Time delays from milliseconds to several minutes are possible with thermistor circuits. Nonlinear characteristic (Various circuit schemes for linearizing the resistance-versus-temperature characteristics of thermistors are necessary) Question

• • . • • Thermistors Thermistors are semiconductors made of ceramic materials that are thermal resistors with a high negative temperature coefficient. That is opposite to the way metals react to such changes. The resistivity of thermistor semiconductors used for biomedical applications is between 0.1 and 100 m. The empirical relationship between the thermistor resistance Rt and absolute temperature Tin kelvins (K) is: R=RoeB(T-T)/TTo] β == material constant for thermistor, K To standard reference temperature, K απ R₁ dT 1 dR₁ = (%/K) The temperature coefficient can be found by differentiating with respect to Tand dividing by Rt. Thus В That a is a nonlinear function of temperature. Dr. Shamekhi, Sahand University of Technology 36 Temperature Measurements - Thermistors p2 • Advantages: - - These devices are small in size (they can be made less than 0.5 mm in diameter) - Have a relatively large sensitivity to temperature changes Excellent long-term stability characteristics (±0.2% of nominal resistance value per year). • Disadvantages: - - Time delays from milliseconds to several minutes are possible with thermistor circuits. Nonlinear characteristic (Various circuit schemes for linearizing the resistance-versus-temperature characteristics of thermistors are necessary) Question

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter12: Electronic Control Devices
Section: Chapter Questions
Problem 14RQ
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Can you propose a circuit to linearize the output of a thermistor, considering that the relationship between its resistance (R) and temperature (T) follows an exponential function ؟
• • . • • Thermistors Thermistors are semiconductors made of ceramic materials that are thermal resistors with a high negative temperature coefficient. That is opposite to the way metals react to such changes. The resistivity of thermistor semiconductors used for biomedical applications is between 0.1 and 100 m. The empirical relationship between the thermistor resistance Rt and absolute temperature Tin kelvins (K) is: R=RoeB(T-T)/TTo] β == material constant for thermistor, K To standard reference temperature, K απ R₁ dT 1 dR₁ = (%/K) The temperature coefficient can be found by differentiating with respect to Tand dividing by Rt. Thus В That a is a nonlinear function of temperature. Dr. Shamekhi, Sahand University of Technology 36 Temperature Measurements - Thermistors p2 • Advantages: - - These devices are small in size (they can be made less than 0.5 mm in diameter) - Have a relatively large sensitivity to temperature changes Excellent long-term stability characteristics (±0.2% of nominal resistance value per year). • Disadvantages: - - Time delays from milliseconds to several minutes are possible with thermistor circuits. Nonlinear characteristic (Various circuit schemes for linearizing the resistance-versus-temperature characteristics of thermistors are necessary) Question
Transcribed Image Text:• • . • • Thermistors Thermistors are semiconductors made of ceramic materials that are thermal resistors with a high negative temperature coefficient. That is opposite to the way metals react to such changes. The resistivity of thermistor semiconductors used for biomedical applications is between 0.1 and 100 m. The empirical relationship between the thermistor resistance Rt and absolute temperature Tin kelvins (K) is: R=RoeB(T-T)/TTo] β == material constant for thermistor, K To standard reference temperature, K απ R₁ dT 1 dR₁ = (%/K) The temperature coefficient can be found by differentiating with respect to Tand dividing by Rt. Thus В That a is a nonlinear function of temperature. Dr. Shamekhi, Sahand University of Technology 36 Temperature Measurements - Thermistors p2 • Advantages: - - These devices are small in size (they can be made less than 0.5 mm in diameter) - Have a relatively large sensitivity to temperature changes Excellent long-term stability characteristics (±0.2% of nominal resistance value per year). • Disadvantages: - - Time delays from milliseconds to several minutes are possible with thermistor circuits. Nonlinear characteristic (Various circuit schemes for linearizing the resistance-versus-temperature characteristics of thermistors are necessary) Question
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