British Petroleum (BP) replaced one of its existing Tytronics online fluoride analyzers at the Castellón refinery in Spain with the online Instran® Fluoride analyzer. Monitoring fluoride levels in real-time with a reliable and accurate online water quality analyzer is integral to maintaining safety of the alkylation zone and overall refinery. Since its installation in January 2022, the Instran analyzer has been operating continuously and has met the facility’s needs to monitor fluoride levels in real-time within the alkylation zone.