Grundfos 96573684 DPI 0-4.0 Sensor. The Differential-Pressure Sensors feature a center mounted chip that transforms the differential pressure into electrical signals. The Chip features a durable design that will protect the chip from wear and tear throughout the sensors lifetime. The Grundfos 96573684 DPI 0-4.0 Sensor also features a nano-coating that improves the chips direct measurement. This coating (Silcoat) is extremely resistant to corrosion, and will keep your system running at an efficient rate, and producing desired results. The Grundfos 96573684 DPI 0-4.0 Sensor is ideal for the following applications: monitoring filters, Ac and temperature control systems, heat exchangers, boilers, and pump control systems.