Designing of Thermistor Digital Thermometer Based on Unbalanced Electric Bridge

Zhang, Dan; Shi, Ming; Chen, Lan Li; Ding, Shu Juan

doi:10.4028/www.scientific.net/kem.538.133

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Hal ini dikarenakan masih sulitnya menemukan media uji sebagai sumber panas yang dapat diatur kenaikan dan penururan suhu sebesar 0,1ᴼC. Namun, dari hasil pengujian terbukti bahwa komponen NTC yang dihubungkan dengan rangkaian Jembatan Wheatstone [1], [4], [7], [8], [10] dan rangkaian penguat differensial menunjukkan linieritas yang lebih baik. Hal ini ditunjukkan dengan nilai koefisien determinasi (R 2 ) = 1 setelah dilakukan pendekatan dengan persamaan regresi polinomial orde-4.…”

Section: Pembahasanunclassified

Rancang Bangun Termometer Tubuh Digital Berbasis Sensor NTC W1209 10k

Rachmat,

Ananda

2024

tech

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Pada paper ini dilakukan implementasi sensor NTC tipe W1209 10k yang memiliki kemasan ergonomis, kecil dan tahan air untuk digunakan sebagai sensor suhu pada termometer tubuh digital. Termometer ini dirancang dengan range suhu dari 32°C sampai dengan 42°C dengan ketelitian 0,1°C. Paper ini ditujukan untuk melakukan evaluasi karakteristik sifat resistansi sensor NTC tipe W1209 10k untuk range suhu tubuh manusia, durasi waktu pengukuran suhu, dan akurasi pengukuran suhu. Sistem termometer ini diimplementasikan dengan menghubungkan sensor NTC pada rangkaian Jembatan Wheatstone untuk mengkonversi perubahan resistansi menjadi perubahan tegangan differensial. Tegangan ini kemudian dikuatkan dengan penguat differensial op-amp untuk menyesuaikan dengan resolusi konversi ADC internal 10-bit yang dilakukan oleh mikrokontroler Arduino Nano. Nilai digital selanjutnya dihitung pada mikrokontroler untuk dapat menampilkan hasil suhu terukur. Dari hasil pengujian yang dilakukan terhadap media air untuk range suhu dari 28ºC sampai dengan 63°C, diperoleh nilai rata-rata resistansi dari 23 k? (± 0,02 k?) sampai dengan 9,1 k? (± 0,07 k?). Durasi pengukuran terbaik termometer dengan sensor NTC untuk pengukuran pada naracoba diperoleh selama dua menit. Adapun hasil pengukuran suhu dengan media air dan melalui tubuh pada bagian ketiak naracoba diperoleh bahwa rata-rata akurasi secara berturut-turut, yaitu 0,05°C (±0,03°C) dan 0,03°C (±0,03°C).

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Section: Pembahasanunclassified

Rancang Bangun Termometer Tubuh Digital Berbasis Sensor NTC W1209 10k

Rachmat,

Ananda

2024

tech

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“…In the recent decades, thermistor has been widely used for temperature measurement among a variety of applications. Nevertheless, however, one of the most significant discussions in thermistor is that it is a piece of semiconductor made from oxides of metal such as cobalt, iron, nickel, manganese, chromium and uranium pressed in into small wafer, disk, bead or other shape fused at high temperatures and ultimately coated with glass or epoxy and produced in the form of thick films, thin films and pellets [1] [2]. There are two types of thermistors namely: PTC (Positive Temperature Coefficient) and NTC (Negative Temperature Coefficient).…”

Section: Introductionmentioning

confidence: 99%

NTC Thermistor Performance and Linearization of its Temperature-Resistance Characteristics Using Electronic Circuit

Aminu¹,

Jumba²,

Jimoh³

et al. 2020

IJASRE

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This paper critically discusses the performance of an NTC thermistor sensor in the temperature range 20 o C to 85 o C and provides a technique for linearization of the temperature sensed by the thermistor. The linearization was achieved by utilizing Wheatstone bridge electronic circuitry which responds to the thermistor and produces an output which is an exponential function of the temperature sensed by the thermistor sensor. A further simple and low-cost electronic circuitry responds to such output and converts the resistance measurement to provide a signal which represents the temperature. Moreover, the Wheatstone bridge signal conditioning circuitry was designed to have 0 -100 mV output voltage within the considered temperature range. The physical characteristics of the thermistor (constant A and b) were found to be 4.0015 x 10 -5 ± 0.2956 x 10 -5 Ω and 3514.8 ± 11.6 K respectively. The result also shows that the percentage nonlinearity was as low as 1.7 and a sensitivity value of 1.5661 mV/K was found for the thermistor, but the resolution of this thermistor sensor is 2 o C. However, the percentage of nonlinearity obtained was in agreement with the theoretical percentage nonlinearity.

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Design of temperature measuring instrument using NTC thermistor of Fe₂TiO₅ based on microcontroller ATmega 328

Munifah

Wiendartun

Aminudin

2019

J. Phys.: Conf. Ser.

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Thermistor is one of temperature sensor which works based on resistance changes and can be used as a temperature measuring instrument. In a previous study, an NTC thermistor of Fe2TiO5 was made in the form of raw pellet without doping, sintered at a temperature of 1200°C for 2 hours in oxygen. A thermistor constant value that obtained from the characterization process is 3821.65 K. This result showed that the thermistor has good quality because it has relatively large constant thermistor. Fe2TiO5 is one of semiconductors that used as basic material for main fabrication component of NTCs as temperature sensor. In this study, temperature measuring instrument using NTC thermistor of Fe2TiO5 sensor based on microcontroller ATMEGA 328. The NTC is assembled in parallel with a fixed resistor and then assembled on ICLM741 and microcontroller ATMEGA 328. The magnitude of the resistor varies at 1 MΩ, 2 MΩ, and 3 MΩ with each resistor having a tolerance value of 1%. From these variations we can get sensitivity value with the value of 0.00688 MΩ/°C; 0.0133 MΩ/°C, and 0.02195 MΩ/°C, respectively. As result, this temperature measuring instrument shows good sensitivity when assembled in parallel using 3 MΩ fixed resistor with a tolerance value of 1% and capable of measuring the temperature in the range 26°C – 103.2°C.

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Designing of Thermistor Digital Thermometer Based on Unbalanced Electric Bridge

Cited by 3 publications

References 2 publications

Rancang Bangun Termometer Tubuh Digital Berbasis Sensor NTC W1209 10k

Rancang Bangun Termometer Tubuh Digital Berbasis Sensor NTC W1209 10k

NTC Thermistor Performance and Linearization of its Temperature-Resistance Characteristics Using Electronic Circuit

Design of temperature measuring instrument using NTC thermistor of Fe₂TiO₅ based on microcontroller ATmega 328

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Designing of Thermistor Digital Thermometer Based on Unbalanced Electric Bridge

Cited by 3 publications

References 2 publications

Rancang Bangun Termometer Tubuh Digital Berbasis Sensor NTC W1209 10k

Rancang Bangun Termometer Tubuh Digital Berbasis Sensor NTC W1209 10k

NTC Thermistor Performance and Linearization of its Temperature-Resistance Characteristics Using Electronic Circuit

Design of temperature measuring instrument using NTC thermistor of Fe2TiO5 based on microcontroller ATmega 328

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Design of temperature measuring instrument using NTC thermistor of Fe₂TiO₅ based on microcontroller ATmega 328