The Sonic-Pro® S4 inline ultrasonic flowmeter features flow measurement technology with no moving parts, and no internal liners to wear out. The S4 Inline pipe fittings facilitate installation of the meter. The flowmeter uses the Transit Time method to measure water flow. A special low power mode permits operation with battery for limited functions. Optional advanced data communication protocols include Industrial Ethernet, Modbus RTU, Modbus TCP, PROFIBUS TPV1,and PROFINET. Download data logging files directly to a flash drive via USB. Dual relays for rate alarms, total alarms or proportional feed control. The Sonic-Pro S4 Ultrasonic flowmeter is NSF 61 Certified, the housing is NEMA 4X (IP 66) for wash-down. There is a comprehensive two-year warranty.