Bahan partikulat dengan ukuran lebih kecil dari 10 μm (PM10) telah dikaji dalam berbagai penelitian sebagai salah satu polutan utama di udara. Monitoring PM10 dibuthkan untuk mengevaluasi kualitas udara pada area spesifik. Propinsi Jambi hanya memiliki tiga stasiun pengukuran kualitas udara, dan satu diantaranya tidak aktif. Informasi polusi PM10 yang didapatkan dari kedua stasiun lainnya hanya tersedia di situs Kementrian Lingkungan Hidup dan data diakumulasi sekali tiap hari. Batasan-batasan tersebut merupakan latar belakang dari penelitian ini untuk merancang alat pengukur PM10 yang portabel, mudah digunakan, rendah biaya, dan simultan. Sensor debu GP2Y1010AU0F digunakan sebagai penghitung PM10 dengan metode optik dan frekuensi 280ms. Data keluaran dari sensor diproses oleh mikrokontroler menggunakan formula kalibrasi yang disediakan oleh pabrik sensor tersebut. Informasi konsentrasi PM10 ditampilkan di layar LCD dan disimpan dalam mikroSD. Uji performa dilaksanakan di Mendalo, Universitas Jambi pada 7 Maret (16.00-18.00), 8 Maret (12.00-14.00), dan 11 Maret 2017 (08.00-10.00). Hasil masing-masing pengukuran menunjukkan bahwa konsentrasi PM10 adalah 145.6 μg/m3, 149.5 μg/m3, dan 157.7 μg/m3. Merujuk pada PP No. 41 (1990), hasil yang didapatkan pada tanggal 11 Maret 2017 melebihi standar kualitas partikulat (150 μg/m3). Alat ini berpotensi untuk dikembangkan lebih lanjut sebagai instrumen monitoring kualitas udara.
The exhaust gas monitoring system in the coffee roasting process continues to be developed considering the need for more complex roasting coffee beans information. The integrated gas sensor is designed by utilizing a microcontroller controller to see the exhaust gas during the roasting process. The exhaust gas produced during the roasting process is monitored by integrating sensors device to measure exhaust gases (CO, CO2, NOx and SO2). Furthermore, measurements were made by monitoring exhaust gas during roasting of Arabica, Liberica and Robusta coffee beans from Jambi province. The results showed that the total CO concentration in Liberica coffee was 2,121 ppm, Robusta 1,930 ppm and Arabica 1,535 ppm while for CO2 was Liberica 21.3 ppm; Robusta is 22.2 ppm; Arabica is 22.4 ppm, and for NOx is Liberica 303 ppm; Robusta 304 ppm; Arabica is 287 ppm, and the SO2 content for all types of coffee is 0 ppm. The highest exhaust gas concentration occurs after roasting lasts > 20 minutes and at a temperature of 210 - 230°C. It concluded that the integrated gas sensor can be used for the measurement of exhaust gas in the process of coffee beans roasting with the results of measurement of CO exhaust concentration in Liberica coffee is higher than Robusta and Arabica coffee beans.
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