Temperature and Humidity Monitoring in Silo

Srilakshmipathy, SD; Abhishek, R; Deepa,

doi:10.1109/rteict52294.2021.9573918

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…In previous research, the temperature measurement systems were designed based on temperature-induced material property changes, such as thermocouples, thermal resistors, and semiconductor sensors [2][3][4]. With advances in microprocessors, modern temperature measurement systems have been developed [5].…”

Section: Introductionmentioning

confidence: 99%

Design of a Negative Temperature Coefficient Temperature Measurement System Based on a Resistance Ratio Model

Liu,

Huo,

Yan

et al. 2024

Sensors

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In this paper, a temperature measurement system with NTC (Negative Temperature Coefficient) thermistors was designed. An MCU (Micro Control Unit) primarily operates by converting the voltage value collected by an ADC (Analog-to-Digital Converter) into the resistance value. The temperature value is then calculated, and a DAC (Digital-to-Analog Converter) outputs a current of 4 to 20 mA that is linearly related to the temperature value. The nonlinear characteristics of NTC thermistors pose a challenging problem. The nonlinear characteristics of NTC thermistors were to a great extent solved by using a resistance ratio model. The high precision of the NTC thermistor is obtained by fitting it with the Hoge equation. The results of actual measurements suggest that each module works properly, and the temperature measurement accuracy of 0.067 °C in the range from −40 °C to 120 °C has been achieved. The uncertainty of the output current is analyzed and calculated with the uncertainty of 0.0014 mA. This type of system has broad potential applications in industry fields such as the petrochemical industry.

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