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Gems® 51582 oil flow switch is part of the FS-930 series family. These flow switches compensate for viscosity change in fluids and have a unique, patented design that assures accuracy from 40 to 2000 SSU (which is within 20% over a full range of viscosities). The FS-930 switches are ideal for use in applications where liquids of different viscosities are blended, or for use in lubrication systems where oil flow monitoring is critical at start-up. Each unit is factory preset using 300 SSU oil for actuation at specified flow rates and compensates for viscosity changes automatically.