Sistem Kontrol Kadar Larutan Pada Proses Penyesuaian PH Bahan Menggunakan PI Controller

Basuki, Al Fitra Agung Sasmita (2026) Sistem Kontrol Kadar Larutan Pada Proses Penyesuaian PH Bahan Menggunakan PI Controller. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proses penyesuaian pH pada *sulphonation plant* industri manufaktur deterjen merupakan titik kritis yang menentukan kualitas akhir produk. Metode pengontrolan manual oleh operator yang masih digunakan saat ini menimbulkan kerentanan operasional akibat kelalaian dan kelelahan manusia. Kondisi tersebut mengakibatkan tingginya angka insiden produk *out-of-specification* (outspec), yang mencapai 19,63% atau 43 dari 219 batch pada Oktober 2025, akibat ketidakakuratan kadar pH larutan. Dampak yang ditimbulkan meliputi pemborosan material bernilai tinggi serta peningkatan biaya produksi. Untuk mengatasi permasalahan tersebut, penelitian ini mengusulkan implementasi sistem kontrol otomatis berbasis Proportional-Integral (PI) untuk mengatur kecepatan motor pompa penambahan cairan BASA007L melalui umpan balik (*feedback*) dari sensor pH. Perancangan dan penalaan parameter pengendali dilakukan menggunakan metode Internal Model Control (IMC) berdasarkan model First-Order Plus Time Delay (FOPTD). Hasil penelitian dan pengujian simulasi menunjukkan bahwa sistem tanpa pengendali menghasilkan *steady-state error* rata-rata sebesar 7,38. Penerapan metode IMC Skogestad terbukti menjadi solusi terbaik karena mampu menghilangkan *steady-state error* hingga 0% pada seluruh variasi *setpoint* (pH 7–11) serta menghasilkan *overshoot* terkecil, yaitu 7,89%–12,81%, dibandingkan metode Morari-Rivera. Pada pengujian kondisi aktual, sistem juga terbukti mampu mempertahankan presisi kadar pH secara stabil dengan rata-rata kesalahan hanya sebesar 1%.
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The pH adjustment process in the sulphonation plant of the detergent manufacturing industry is a critical stage that determines final product quality. The current manual control method performed by operators introduces operational vulnerabilities due to human error and fatigue. As a result, the incidence of out-of-specification (outspec) products reached 19.63% (43 out of 219 batches in October 2025), primarily due to inaccurate solution pH levels, leading to significant material waste and increased production costs. To address this issue, this study proposes the implementation of an automated Proportional-Integral (PI) control system to regulate the pump motor speed for BASA007L liquid addition using real-time feedback from a pH sensor. Controller design and parameter tuning were carried out using the Internal Model Control (IMC) method based on a First-Order Plus Time Delay (FOPTD) process model. The research results and simulation tests demonstrate that the uncontrolled system produced an average steady-state error of 7.38. The IMC Skogestad tuning method proved to be the most effective approach, completely eliminating steady-state error (0%) across all setpoint variations (pH 7–11) while producing the lowest overshoot (7.89%–12.81%) compared with the Morari-Rivera method. Under actual operating conditions, the proposed control system consistently maintained accurate pH levels with an average error of only 1%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Outspec, pH Larutan, PI, Outspec, solution’s pH, PI.
Subjects:	T Technology > T Technology (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK3070 Automatic control
Divisions:	Faculty of Vocational > 36304-Automation Electronic Engineering
Depositing User:	Al Fitra Agung Sasmita Basuki
Date Deposited:	06 Aug 2026 02:05
Last Modified:	06 Aug 2026 02:05
URI:	http://repository.its.ac.id/id/eprint/143178

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