“ Key points : Rugged weather-resistant housing: for continuous and reliable outdoor operation Air purge system: Keeps optical components clean so that the ES-642 can operate in adverse environments without degradation in performance. Automatic zero calibration: Reduces long-term measurement drift by automatically adjusting the zero value every hour. Controlled Input Heating: Active input humidity control to reduce measurement errors. Front Panel LCD Display: Provides information on particle concentration, flow rate, and instrument status. Flexible mounting hardware: Optional mounting bracket for wall or 2 ”vertical pole or for vertical pole diameters up to 4.7 inches (120mm). ”
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