The paddle flow switch are designed to provide excellent performance where accuracy, reliability, and rugged construction are required used in liquid flow lines carrying water or any fluid neither harmful to brass and phosphor bronze nor classified as a hazardous fluids. They can be wired to close one circuit and open a second circuit when liquid flow either exceeds or drops below the adjusted flow rate. These are recommended for liquid pressure and temperature as mentioned below and must not be used on lines carrying liquids below 0 C degree.