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Ultrasonic Flowmeter | FDT-21

Ultrasonic Flowmeter

CAD2,695.00 FDT-21

1 year warranty CE
  • Accuracy 1%
  • Repeatability 0.2%
  • Positive, Negative and Net Totalizer
  • 4-Line LCD Display
  • Clamp On Transducers
  • RS232 Output
Doppler/Transit-Time Ultrasonic Flow Meters - View related products


FDT-21 ultrasonic flowmeter is designed to measure the fluid velocity of liquid in a full/closed pipe. It is a handheld measurement system which is both easy to install and use. The FDT-21 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-21 can be used for metallic, plastic and rubber tubes.

±1% of reading >(0.2m/s) 0.6 ft/s
Repeatability: 0.2%
Linearity: 0.5%
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 70°C (32 to 158°F)
    With High Temp Transducers: 0 to 160°C (32 to 320°F)
Pipe Size: DN 19 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, liter, 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: 4 x 16 english letters
Communications: RS232C (baud rate from 75 to 115,200 bps)
Transducer Cable Length: 5 m (15')
Power: 3 "AAA" Ni-H built-in batteries (included) with 90 to 230 Vac charger, fully charged lasts over 12 hrs.
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: 100 H x 66 W x 20 mm D (3.9 x 2.6 x 0.8")
Weight: 514 g (1.2 lb)
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Most Popular Models!

Part Number/ Desc.
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FDT-21 Star
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Replacement generation 2 small pipe transducer 94g (3.32oz)
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Medium pipe transducer
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Large pipe high temp transducer
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Acoustic gel for standard transducers
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Availability: 1 week
Acoustic gel for high-temperature transducers
FDT-21-CLAMP1 Star
Availability: 1 week
(Replacement) Transducer pipe clamp set for up to DN100 (4")
FDT-21-CLAMP2 Star
Availability: 7 weeks
Transducer pipe clamp set for up to DN200 (8")
FDT-21-CLAMP3 Star
Availability: 1 week
Transducer pipe clamp set for up to DN300 (12")
FDT-21-CLAMP4 Star
Availability: 1 week
Transducer pipe clamp set for up to DN400 (16")
FDT-21-CLAMP5 Star
Availability: 1 week
Transducer pipe clamp set for up to DN500 (20")
FDT-21-CLAMP6 Star
Availability: In Stock
Transducer pipe clamp set for up to DN600 (24")
FDT-21-UPS Star
Availability: 1 week
Universal power supply
Availability: 9 weeks
15 Meter set of transducer cables
All dollar amounts on this site are shown in Canadian currency. Note: Comes complete with 3 "AAA" batteries, small pipe standard/high temperature (S2H)transducer, acoustic gel, tape measure, plug-in 120Vac charger, RS232 cable, transducer cable, rugged carrying case and operator’s manual.