Design and Development of A Portable Conductivity-Based Salinity Measurement System for Coastal Well Water

Mohammad Rasyidi Azhari; Lalu Sahrul Hudha; Dian Wijaya Kurniawidi

doi:10.20414/konstan.v9i01.516

Mohammad Rasyidi Azhari University of Mataram
Lalu Sahrul Hudha University of Mataram
Dian Wijaya Kurniawidi University of Mataram

DOI: https://doi.org/10.20414/konstan.v9i01.516

Keywords: Salinity, Conductivity, Sensor, Data logger

Abstract

Seawater intrusion increases groundwater salinity and affects the quality of residents' healthy water around coastal areas. Therefore, simple mapping of seawater intrusion distribution based on the salinity values of healthy water around coastal areas is necessary. This mapping can be done by measuring the salinity of the water using a portable and real-time instrument. The existing measurement system is not resistant to corrosion, does not have a data logger system, and does not have a display system capable of showing real-time salinity value graphs. In this study, a portable salinity measurement system resistant to corrosion caused by high salt levels was developed. The salinity measurement method used is the conductivity method. The salinity value of the solution is proportional to the measured conductivity value of the solution. Conductivity measurement uses two electrodes connected to a voltage divider circuit with an AC power source to avoid electrode polarization and electrochemical reactions. The output voltage of this voltage divider circuit is proportional to the conductivity value of the solution in which the two electrodes are immersed, based on Ohm's law. This output voltage is fed into a signal conditioning circuit consisting of an amplifier, filter, and full-wave rectifier. Subsequently, an Atmega 328 microcontroller processes this data for real-time display on a TFT LCD and real-time storage on a data logger module. Testing and calibration are then carried out to obtain the relationship between the solution's salinity value and the measured output voltage, expressed as a 2nd-order polynomial function Vout = -0.0012C2 + 3.5126C + 14.194. Additionally, it is known that salinity measurement results using the conductivity method are influenced by temperature, so temperature measurement using the DS18B20 sensor is required to obtain a compensation factor due to temperature changes. The higher the temperature, the higher the measured salinity value for the exact solution measurement.

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References

[1] M. Khairul Annam, Yohanna Lilis Handayani, and Lita Darmayanti, “Pemetaan Salinitas Sumur Dangkal Berdasarkan Jumlah Konsentrasi Garam Di Kecamatan Tebing Tinggi Dan Tebing Tinggi Barat Kabupaten Kepulauan Meranti,” JOURNAL OF INFRASTRUCTURE AND CIVIL ENGINEERING, vol. 02, no. 01, pp. 25–33, 2022.
[2] Muhardi, Faurizal, and Widodo, “Analisis Pengaruh Intrusi Air Laut terhadap Keberadaan Air Tanah di Desa Nusapati, Kabupaten Mempawah Menggunakan Metode Geolistrik Resistivitas,” Indonesian Journal of Applied Physics, vol. 10, no. 2, pp. 2089–0133, 2020.
[3] D. Radityo et al., “Identifikasi Keberadaan Intrusi Air Laut pada Kawasan Pemukiman di Sekitar Pesisir Pantai Daerah Desa Sukajaya Lempasing Kecamatan Teluk Pandan,” Journal of Science and Applicative Technology, vol. 4, no. 2, p. 110, Dec. 2020, doi: 10.35472/jsat.v4i2.366.
[4] M. Fajar Ismawan, T. Budi Sanjoto, and W. Setyaningsih Jurusan Geografi, “KAJIAN INTRUSI AIR LAUT DAN DAMPAKNYA TERHADAP MASYARAKAT DI PESISIR KOTA TEGAL,” 2016. [Online]. Available: http://journal.unnes.ac.id/sju/index.php/geoimage
[5] A. W. Krisdiarto, A. Ferhat, M. Prasanto Bimantio, I. P. Stiper, and Y. Jl, “Penyediaan Air Bagi Masyarakat Pesisir Terdampak Kekeringan dengan Teknologi Desalinasi Air Laut Sederhana,” 2020.
[6] D. Hastama Nugraha, M. Mahida, B. Litbang Sosekling Bidang Permukiman, P. Litbang Sosial, E. dan Lingkungan, and K. Pekerjaan Umum Jalan Laksda Adisucipto, “KESIAPAN MASyARAKAT MENERAPKAN TEKNOLOGI TEPAT GUNA PENGOLAHAN AIR MINUM (STUDI KASUS : PULAU PALU’E, NUSA TENGGARA TIMUR),” Jurnal Sosek Pekerjaan Umum, vol. 5, no. 2, pp. 119–129, 2013.
[7] Anis Milena Cesari Kutananda and Harmin Sulistiyaning Titah, “Kajian Desalinasi Air Laut Menggunakan Sistem Reverse Osmosis sebagai Pemenuhan Kebutuhan Air Tawar Kampung Wisata Apung, Malahing, Kota Bontang dan SDGs Poin 6,” JURNAL TEKNIK ITS, vol. 11, no. 3, pp. 107–112, 2022.
[8] W. Riyanti, S. Y. S. Rahayu, and A. K. Fauzie, “ANALISIS PENGARUH JUMLAH PENDUDUK TERHADAP SALINITAS AIR TANAH DI WILAYAH PESISIR KARAWANG,” Barometer, vol. 7, no. 2, pp. 69–77, Jul. 2022, doi: 10.35261/barometer.v7i2.5845.
[9] H. M. Suud, D. E. Kusbiantoro, M. G. Rosyady, and O. A. Farisi, “JURNAL REVIEW : EFEKTIVITAS PENGUKURAN KONDUKTIVITAS LISTRIK TANAH UNTUK MENDUGA KONDISI KESUBURAN TANAH PADA LAHAN PERTANIAN,” Hijau Cendikia, vol. 7, no. 2, pp. 71–79, 2022.
[10] A. A. Hafiidh, S. Krido Saptomo, C. Arif, D. R. Santoso, and B. Waspodo, “Sebaran Intrusi Air Laut di Kabupaten Indramayu, Jawa Barat (Distribution of Seawater Intrusion in Indramayu District, West Java),” 2018.
[11] I. A. Rozaq, D. Tauhida, R. Primadasa, and F. Setiawan, “Uji Linieritas Sensor Konduktivitas Pada Prototipe Pengukur Kualitas Air Tambak,” Jurnal Zetroem, vol. 05, no. 02, pp. 136–139, 2023.
[12] Y. Yolanda, “Analisa Pengaruh Suhu, Salinitas dan pH Terhadap Kualitas Air di Muara Perairan Belawan,” Jurnal Teknologi Lingkungan Lahan Basah, vol. 11, no. 2, pp. 329–337, 2023.