PENGUKURAN KADAR KARET KERING LATEKS MENGGUNAKAN PROTOTIPE INSTRUMEN DIGITAL BERBASIS SENSOR CAHAYA
DOI:
https://doi.org/10.22302/ppk.jpk.v44i1.1307Keywords:
Digitalisasi, Hevea brasiliensis, pertanian presisi, KKK meterAbstract
Abstrak
Penentuan kadar karet kering (KKK) pada lateks umumnya dilakukan dengan metode gravimetri yang memerlukan waktu lebih dari dua jam untuk setiap sampel. Lamanya waktu analisis ini menjadi faktor pembatas bagi kebutuhan analisis sampel lateks yang jumlahnya banyak. Penelitian ini bertujuan untuk mengembangkan dan mengevaluasi akurasi prototipe instrumen KKK lateks digital berbasis sensor cahaya (LDR). Evaluasi akurasi instrumen KKK lateks ini dilakukan dengan membandingkan data hasil pengukuran KKK lateks menggunakan metode laboratorium baku (ISO 126:2005) dengan instrumen berbasis sensor cahaya, yaitu LDR GL5516. Data KKK yang didapatkan dari kedua metode tersebut sebanyak 149 sampel kemudian dilakukan analisis statistika untuk menentukan nilai Goodness of Match (GOM), Pearson Correlation Coefficient (R), Koefisien Determinasi (R2), dan Root Mean Square Error (RMSE). Hasil kalibrasi menunjukkan hubungan erat antara nilai Analog to Digital Converter (ADC) dan KKK dengan persamaan yang membentuk kurva power dengan R² sebesar 0,78. Validasi menggunakan sampel terpisah menunjukkan nilai R² sebesar 0,90, GOM sebesar 0,95 R sebesar 0,95, dan RMSE sebesar 2,10%. Hasil tersebut menunjukkan bahwa instrumen ini mampu memberikan estimasi KKK dengan akurasi relatif tinggi dan simpangan yang relatif kecil. Hal ini juga mengindikasikan bahwa instrumen ini berpotensi untuk digunakan sebagai perangkat cepat, portabel, dan praktis untuk mempercepat penentuan KKK lateks di perkebunan maupun pabrik karet.
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