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Design of a Negative Temperature Coefficient Temperature Measurement System Based on a Resistance Ratio Model.
Ziang Liu1,2, Peng Huo1,2, Yuquan Yan1,3
1State Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics & Chemistry of CAS, 40-1 South Beijing Road, Urumqi 830011, China.
Sensors (Basel, Switzerland)
|May 11, 2024
Summary
This study presents a high-precision temperature measurement system using Negative Temperature Coefficient (NTC) thermistors. The system achieves 0.067°C accuracy, ideal for industrial applications like the petrochemical industry.
Area of Science:
- Instrumentation and Measurement
- Materials Science
Background:
- Negative Temperature Coefficient (NTC) thermistors offer sensitive temperature detection but exhibit nonlinear behavior.
- Accurate temperature monitoring is critical in various industrial sectors, including petrochemicals.
Purpose of the Study:
- To design and validate a high-precision temperature measurement system utilizing NTC thermistors.
- To address and overcome the inherent nonlinearity of NTC thermistors for improved accuracy.
Main Methods:
- A Micro Control Unit (MCU) processes voltage from an Analog-to-Digital Converter (ADC) to determine resistance.
- A resistance ratio model and the Hoge equation were employed to linearize NTC characteristics and enhance precision.
- A Digital-to-Analog Converter (DAC) outputs a 4-20 mA current linearly proportional to temperature.
Main Results:
- The designed system successfully compensated for NTC thermistor nonlinearity.
- Achieved a high temperature measurement accuracy of 0.067 °C across a -40 °C to 120 °C range.
- Output current uncertainty was calculated to be 0.0014 mA.
Conclusions:
- The developed temperature measurement system demonstrates robust performance and high accuracy.
- The system's design, effectively managing NTC nonlinearity, offers significant potential for industrial temperature monitoring, particularly in the petrochemical industry.
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