Non-Intrusive Flow Switch and Flow Velocity using Doppler Ultrasonic Technology!
The ECHO FlowSwitch is a simple, reliable Doppler flow
switch and liquid velocity meter. It is
an encapsulated self-contained clamp-on flow sensor for dirty water and wastewater flow conditions. It is low cost and pre-calibrated from the factory 0-20 ft/s (6.096 m/s) equals 0-5 VDC proportionally
(higher velocities available as an option). It can
be custom ordered to any velocity range or provide a TTL Pulse output up to 5000 Hz with a K factor supplied on the
It uses very advanced and unique Adaptive Zoom Windowing and
Auto Flow-profile Algorithms to produce factory calibrated +/-
1.0% accuracy. It is an
economical solution to flow measurement in all pipe sizes from 0.75 to 30 inch diameters or as a flow switch in any
size pipe greater than 0.75 inch diameter.
It requires no programming or calibration. Just clamp it on the pipe and connect the velocity output. That’s it!
Principle of Operation
The Doppler flowmeter utilizes the well known Doppler
effect, which is named after Christian Doppler, who documented the
effect in 1842. In general
terms it is the change in frequency and wavelength of a wave as perceived by an observer moving
relative to the source of waves.
The ECHO FlowSwitch has an array of piezoelectric crystals; part of the array transmits a beam
of high frequency ultrasonic pressure waves so as to form a fixed
cross angle with the pipe axis.
As the beam travels into the non-homogeneous fluid, some energy is scattered back by solid particles or gas bubbles entrained in the wave, which is
received and analyzed by the ultrasonic flow meter. The different frequency is known as the Doppler shift. This is linearly proportional to the fluid velocity. As
the internal cross sectional area of the pipe is easily measured so the volumetric flow rate is easily
Measures virtually any dirty liquid in any pipe - 60 day Performance Guaranteed!
Technical Specifications: FlowSwitch
Measuring Principle Ultrasonic Doppler Clamp-on Flowmeter and Flow Switch
Measuring Range 0 … 20 ft/sec (0 … 6.096 m/s) (option: up to 40 ft/s)
Pipe Diameters 0.75 to 256 inch (20 to 6500 mm) diameter
Accuracy +/- 1% (process conditions and flow profile can reduce accuracy)
Power Supply 24 VDC (18-34 VDC), 40 mA
Analog 0-5 VDC output proportional to 0-20 ft/s
(custom ranges from 0-40 ft/s)
Pulse Optional TTL Pulse output up to 5000 Hz (K factor supplied)
Signal Strength Standard Signal Strength output
User-interface None, comes preprogrammed
Temperature Range (Electronics) 21˚F to +167˚F (-6˚C to +75˚C)
Outdoor Rating (Electronics) NEMA 4X (IP 66)
Dimensions 4.41 x 1.37 x 1.26 inch (112 x 35 x 32 mm)
Enclosure Material Stainless Steel and plastic combination
Cable Length 33 ft (10 m) standard, optional lengths available
Weight Approximate 0.44 lbs (200 g)
Product Warranty 2 years