Ultrasonic FlowmeterFDT100 Series flowmeter employs advanced transit-time ultrasonic technology, in which two flow sensors alternately transmit and receive a signal and "time of flight" is used to measure flow rate. Designed for long, economical service in either consumable or industrial water applications, these battery-powered meters have no moving parts. Pressure loss is minimal and filtration unnecessary. Long-term stability and a wide measurement range facilitate monitoring of consumption and leakage. Both flange styles-150-lb. ANSI and DIN-come in various sizes, with a choice of integral or remote electronics that display flow rate or total at the push of a button.