The liquid line metal detectors are used to detect the presence of ferrous, nonferrous and stainless metal contaminants in viscous products such as liquids, slurries, syrups, pastes and many other pumped materials. Besides enhancing product purity, the liquid line systems can protect vital downstream equipment from metal in the product stream, thereby reducing machinery downtime and maintenance costs, according to the manufacturer. When metal is detected in the product flow, a signal is sent to one of the available output relays. The output relay can be used to activate a ball valve, control a visual or audio alarm, stop the product flow or send a signal to a PLC. Complete systems can be provided in pipe sizes ranging from one– to four–inch diameter.