See FDT-25W as a direct replacement FDT-21W ultrasonic flowmeter is designed to measure the fluid velocity of liquid in a full/closed pipe. It is a measurement system which is both easy to install and use. The FDT-21W operates according to the difference in the transit time of flight measured, and determines the flow velocity by measuring the travel time of a pulse from one transducer to the next. Flow in the same direction takes less time to travel to the second transducer than does flow in the opposite direction. Electroacoustic transducers receive and emit brief ultrasonic pulses through the liquid of the pipe. Transducers are vertically placed at both sides of the measured pipe. Sensors are placed on the pipe and fastened by means of a clamp. The display will quickly show the flow velocity. The FDT-21W can be used for metallic, plastic and rubber tubes.
Specifications Accuracy: ±1% of reading >(0.2 m/s) 0.6 ft/s Repeatability: 0.2% Linearity: 0.5% Output: 4 to 20 mA Response Time: 0 to 999 seconds (user configured) Velocity: (±0.01 to 30 m/s) ±0.03 to 105 ft/s bi-directional Temperature Range: Standard: 0 to 160°C (32 to 320°F) Pipe Size: DN 20 to 100 mm (0.75 to 4") standard [up to DN 6000 mm (236") with optional transducers] Transducer Frequency: 1 MHz Rate Units (User Configured): Meter, feet, cubic meter, cubic feet, USA gallon, oil barrel, USA liquid barrel, imperial liquid barrel, million USA gallons Totalizer: 7-digit totals for positive, negative and net flow Liquid Types: Most liquids including clean water, sea water, waste water, chemical liquids, oil, crude oil, alcohol, beer, and more Suspension Concentration: ?20,000 ppm (may contain very small amounts of air bubbles) Pipe Material: All metals, most plastics and fiberglass Security: Programmable lock-out code Display: 2 x 16 english letters Power: 85 to 264 Vac Communications: RS485 (baud rate from 75 to 115,200 bps) Transducer Cable Length: 5 m (15') Data Logger: Built-in, stores over 2000 lines of data Totalizer/Calibration: 7-digit press-to-go for calibration Housing: ABS plastic with aluminum alloy protective carrying case Case: NEMA 4 (IP65) Dimensions: 29 H x 20 W x 9 cm D (11.5 x 8 x 3.5") Weight: 514 g (1.2 lb)