FDT-21W Datasheet, PDF (1/2 Pages) Fairchild Semiconductor – Wall Mount Ultrasonic FlowMeter For Clean Liquids

Wall Mount Ultrasonic FlowMeter
For Clean Liquids
FDT-21W
U Accuracy 1%
U Repeatability 0.2%
U Positive, Negative and
Net Totalizer
U 4-Line LCD Display
U Clamp On Transducers
U RS232 Output
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
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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
FDT-21W shown smaller than actual size.
of a clamp. The display will quickly
show the flow velocity. The FDT-21W
can be used for metallic, plastic and Specifications
rubber tubes.
Accuracy: ±1% of reading >(0.2 m/s)
Liquid Types: Most liquids including
clean water, sea water, waste water,
chemical liquids, oil, crude oil, alcohol,
0.6 ft/s
beer, and more
Repeatability: 0.2%
Suspension Concentration:
Linearity: 0.5%
≤20,000 ppm (may contain very small
Response Time: 0 to 999 seconds
amounts of air bubbles)
(user configured)
Pipe Material: All metals, most plastics
Velocity: (±0.01 to 30 m/s) ±0.03 to
and fiberglass
105 ft/s bi-directional
Security: Programmable lock-out code
Temperature Range:
Display: 4 x 16 english letters
Standard: 0 to 70ºC (32 to 158ºF)
Power: 85 to 264 Vac
With High Temp Transducers:
Communications: RS232C (baud rate
0 to 160ºC (32 to 320ºF)
from 75 to 115,200 bps)
Pipe Size: DN 20 to 100 mm (0.75 to
Transducer Cable Length: 5 m (15')
4") standard [up to DN 6000 mm (236") Data Logger: Built-in, stores over
with optional transducers]
2000 lines of data
Transducer Frequency: 1 MHz
Totalizer/Calibration:
Rate Units (User Configured):
7-digit press-to-go for calibration
Meter, feet, cubic meter, cubic feet,
Housing: ABS plastic with aluminum
USA gallon, oil barrel, USA liquid barrel, alloy protective carrying case
imperial liquid barrel, million
Case: NEMA 4 (IP65)
USA gallons
Dimensions: 100 H x 66 W x 20 mm D
FDT-21W inside view.
Totalizer: 7-digit totals for positive,
(3.9 x 2.6 x 0.8")
negative and net flow
Weight: 514 g (1.2 lb)
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