Electronic Theses and Dissertation

Laboratorium kimia berpotensi terpapar gas berbahaya dari uap bahan kimia volatil akibat aktivitas praktikum, seperti membuka dan menutup botol serta penyimpanan bahan kimia yang kurang rapat. Laboratorium Dasar Teknik Kimia Universitas Syiah Kuala (LDTK USK) hingga saat ini belum memiliki sistem pemantauan kualitas udara khusus dan masih mengandalkan ventilasi serta indra penciuman. Penelitian ini bertujuan untuk merancang dan mengimplementasikan sistem pemantauan kualitas udara berbasis Internet of Things (IoT) bernama LABSAFE (Laboratory Safety Monitoring System) pada lemari bahan kimia laboratorium. Sistem menggunakan mikrokontroler ESP-32 sebagai pusat kendali, sensor MQ-135 untuk mendeteksi Volatile Organic Compounds (VOC), serta sensor BME680 untuk memantau suhu dan kelembapan udara. Data dikirim ke platform Blynk IoT melalui Wi-Fi setiap 30 detik dan ditampilkan secara real-time pada dashboard komputer maupun smartphone. Pengujian dilakukan terhadap enam zat kimia volatil di dalam lemari asam laboratorium. Hasil pengujian sensor MQ-135 menunjukkan rata-rata estimasi VOC sebesar 0,74 ppm (baseline/tanpa zat), 2,25 ppm (asam asetat), 2,51 ppm (kloroform), 3,32 ppm (n-heksana), 3,56 ppm (alkohol/etanol dan metanol), dan 102,71 ppm (amonia), seluruhnya masuk kategori Aman kecuali amonia yang masuk kategori Bahaya. Sensor BME680 menunjukkan rata-rata galat suhu sebesar 18,13 % dan rata-rata galat kelembapan sebesar 14,15% terhadap alat referensi HTC-1. Sistem LABSAFE terbukti mampu memantau kualitas udara secara real-time dan memberikan peringatan dini otomatis, sehingga dapat mendukung peningkatan keselamatan kerja di lingkungan Laboratorium Dasar Teknik Kimia

Chemical laboratories are potentially exposed to hazardous gases from volatile chemical vapors resulting from practicum activities, such as opening and closing chemical bottles and improperly sealed chemical storage. The Basic Chemical Engineering Laboratory of Universitas Syiah Kuala (LDTK USK) currently does not have a dedicated air quality monitoring system and still relies on ventilation and the sense of smell. This study aims to design and implement an Internet of Things (IoT)-based air quality monitoring system called LABSAFE (Laboratory Safety Monitoring System) for the laboratory's chemical storage cabinet. The system uses an ESP-32 microcontroller as the control center, an MQ-135 sensor to detect Volatile Organic Compounds (VOC), and a BME680 sensor to monitor air temperature and humidity. Data is sent to the Blynk IoT platform via Wi-Fi every 30 seconds and displayed in real time on a computer or smartphone dashboard. Testing was conducted on six volatile chemical substances inside the laboratory fume hood. The MQ-135 sensor test results showed average estimated VOC concentrations of 0.74 ppm (baseline/without substance), 2.25 ppm (acetic acid), 2.51 ppm (chloroform), 3.32 ppm (n-hexane), 3.56 ppm (alcohol/ethanol and methanol), and 102.71 ppm (ammonia), all of which fell into the Safe category except for ammonia, which fell into the Hazardous category. The BME680 sensor showed an average temperature error of 18.13% and an average humidity error of 14.15% compared to the HTC-1 reference device. The LABSAFE system was proven capable of monitoring air quality in real time and providing automatic early warnings, thereby supporting improved occupational safety in the Basic Chemical Engineering Laboratory environment