Prototipe sistem peringatan dini berbasis SMS untuk mendeteksi kenaikan kadar gas amoniak di pengolahan air limbah industri penyamakan kulit

The objective of this research was to produce prototype of an early warning system based on SMS for detection the rising level of ammonia gas in roman atwood gfuel wastewater treatment of leather tanning industry.The systems consist of three parts, those were data input, data processing, and output.Ammonia gas sensor as a detector that produces an

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