Adini, Naila Putri and Prof. Dr.-Ing. Setyawan Purnomo Sakti, M.Eng. and Drs. Hari Arief Dharmawan, M.Eng. (2024) Rancang Bangun Sensor Kapasitif Untuk Deteksi Gas Amonia. Sarjana thesis, Universitas Brawijaya.
Abstract
Pengembangan sensor kapasitif untuk pendeteksi gas amonia dilakukan di dalam chamber tertutup untuk mencegah terjadinya kontaminasi dan percampuran antar zat selama pengukuran berlangsung. Dalam penelitian ini, digunakan sensor interdigital capacitive (IDC) dengan rangkaian RC isolator schmitt trigger yang nilai kapasitansinya bergantung pada permitivitas keadaan sekitar. Pemanfaatan sensor kapasitif dilakukan untuk mengetahui perubahan frekuensi sensor terhadap perubahan konsentrasi gas amonia di sekitar sensor. Respon yang diberikan sensor kapasitif berupa frekuensi yang dipengaruhi oleh kapasitansi dan permitivitas sekitar sensor, dalam hal ini dipengaruhi gas amonia. Perubahan permitivitas di sekitar sensor terjadi karena konstanta dielektrik udara sebelum terkontaminasi gas amonia berbeda dengan udara yang sudah terkontaminasi gas amonia. Pengukuran untuk mengetahui respon frekuensi sensor kapasitif dilakukan dengan peinjeksian NH4OH 25% ke chamber tertutup. Perubahan respon frekuensi sensor kapasitif akan dilihat dengan mengambil 5 buah titik sampel penguapan, yaitu 2000 detik, 4000 detik, 6000 detik, 8000 detik, dan 10000 detik setelah injeksi dilakukan. Berdasarkan penelitian dan analisa yang dilakukan, sensor kapasitif memiliki respon frekuensi yang berbanding terbalik dengan perubahan konsentrasi gas amonia dalam chamber tertutup setelah proses injeksi 0,05mL, 0,15mL, 0,35 mL, dan 0,45 mL NH4OH 25%.
English Abstract
The development of a capacitive sensor for detecting ammonia gas was carried out in a closed chamber to prevent contamination and mixing between substances during the measurement. In this research, an interdigital capacitive (IDC) sensor with a Schmitt trigger RC isolator circuit is used whose capacitance value depends on the permittivity of the surrounding conditions. The use of capacitive sensors is carried out to determine changes in sensor frequency regarding changes in the concentration of ammonia gas around the sensor. The response given by a capacitive sensor is a frequency which is influenced by the capacitance and permittivity around the sensor, in this case influenced by ammonia gas. Changes in permittivity around the sensor occur because the dielectric constant of air before being contaminated with ammonia gas is different from air that has been contaminated with ammonia gas. Measurements to determine the frequency response of the capacitive sensor were carried out by injecting 25% NH4OH into chamber. Changes in the frequency response of the capacitive sensor will be seen by taking 5 evaporation sample points, namely 2000 seconds, 4000 seconds, 6000 seconds, 8000 seconds and 10000 seconds after the injection. Based on this research and analysis, capacitive sensor have a frequency response that is inversely proportional to changes in the concentration of ammonia gas in the the chamber is closed after the injection process of 0.05 mL, 0.15 mL, 0.35 mL, and 0.45 mL of 25% NH4OH.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | 052409 |
| Uncontrolled Keywords: | Sensor kapasitif, MQ137, Vacuum pump, multi�kapasitor, interdigital capasitive sensor |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika |
| Depositing User: | Unnamed user with username nova |
| Date Deposited: | 11 Sep 2024 07:16 |
| Last Modified: | 11 Sep 2024 07:16 |
| URI: | http://repository.ub.ac.id/id/eprint/225269 |
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Text (DALAM MASA EMBARGO)
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