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 calibration sheet.

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 calculated.

Measures virtually any dirty liquid in any pipe - 60 day Performance Guaranteed!

• Doppler Technology with High Accuracy +/- 1.0% of measured value (process conditions can reduce accuracy)

• Low cost non-invasive flow switch and meter

• Precalibrated 0-20 ft/s -  No Programming Needed!

• Easy to install clamp-on transducer

• Reliable measurements on any pipe from 0.75 to 300 inch diameters

• Signal Strength output optional

• Measure flow/ no flow or flow velocity without cutting the pipe

• Zero head loss results in improved pumping efficiency

Technical Specifications:  FlowSwitch  

TECHNOLOGY/ OPERATION
Measuring Principle                                       Ultrasonic Doppler Clamp-on Flowmeter and Flow Switch

PERFORMANCE
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  

OUTPUTS
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

PROGRAMMING
User-interface                                                   None, comes preprogrammed
Display                                                                  None
ENVIRONMENT 
Temperature Range (Electronics)              21˚F to +167˚F  (-6˚C to +75˚C)
Outdoor Rating (Electronics)                       NEMA 4X  (IP 66)

DESIGN 
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)

WARRANTY
Product Warranty                                            2 years