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Liquidew EExd is a purpose designed, certified explosion-proof solution to on-line continuous moisture measurement for petrochemical liquid applications. Liquidew EExd is installed directly in the hazardous area, simplifying site installation and retrofits. Moisture content is determined in part per million by weight (ppmW) through Henry's Law from the measured water dew-point temperature and liquid temperature. The instrument uses an extensive list of saturation concentration data pre-programmed for a variety of petrochemical liquids, with provision for easy entry of 'custom' characteristics data by the user.