EDS E-Flow Manual de usuario
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E-Flow
User Manual V1.32
E-Flow User Manual
1.1 E-Flow Brief"2!
1.2 Measuring Principle"2!
1.2.1 Flow Rate Measurement Principle"2!
1.2.2 Principle Depth Of Flow Measurement"3!
1.2.3 Flow Measurement Principle"3!
1.3 Specifications"4!
1.3.1 Features"4!
1.3.2 Wiring interface"4!
1.3.3 Size & Dimensions"6!
2 Installation"7!
2.1 Instrument installation method and direction"7!
2.2 Site Selection"8!
2.3 Installation Precautions"10!
2.4 Installing Sensor Connector"10!
3 Operating Modes"11!
3.1 Normal Mode"11!
3.2 Sleep Mode"11!
4. Technical Specifications"12!
5. Application Scenarios and Solutions"13!
6. System Configuration Software"15!
6.1 Installation Preparation"15!
6.2 Software Interface"16!
6.3 Flow Meter Parameter Settings"17!
6.4 Velocity Spectrum"19!
6.5 History Record"20!
Appendix A Frequently Asked Questions"21!
Appendix B Shipping List"22
E-Flow Radar Flow Meter Manual V1.24 "" """"1
1.1 E-Flow Brief
The E-Flow is a non-contact fully integrated flow monitor continuously measures flow, depth of flow, and
velocity. The E-Flow uses highly accurate and reliable radar planar microwave technology to capture the true
velocity and depth of flow zero contact with the flow. With the simple software to configure your E-Flow you
can record and measure flow in any channel shape, whilst sending measure flow, level, and velocity
seamlessly over the 4G network to view in realtime on the cloud platform. !
The E-Flow support digital (RS485, RS232) or analog (4-20mA) transmission of recorded data, using
standard Modbus-RTU protocol. The E-Flow is designed to operate in the harshest of environments for
longer with ultra low power consumption, compact sizing, highly reliable, simple set up, and almost zero
maintenance. Also the E-Flow is not affected by environmental factors such as debris in the flow, large
volumes of sediment, river pollutants, and floating objects!
1.2 Measuring Principle
The E-Flow meter uses doppler planar microwave technology to measure over 10,000 velocity points to
record a true average velocity for your measured area. The E-Flow also uses the doppler micro strip radar
technology to record the depth of flow. By using the industry standard velocity-area method, the water level
is measured to convert the cross-sectional area, and then the average velocity is converted from the true
average velocity combined with the cross-sectional parameters. The empirical formulas for the velocity
distribution of the open channel cross section such as circular, rectangular and trapezoidal are established,
and the hydraulic model algorithm is used to obtain Flow rate is a non-contact flow measuring instrument
that accurately measures the flow rate without changing the boundary conditions of channels, rivers, pipes,
etc.!
1.2.1 Flow Rate Measurement Principle
The radar velocity meter uses the principle of Doppler radar velocity measurement. When measuring the
speed of the water surface, the radar velocity sensor emits microwaves to the water surface, and the
microwaves will be absorbed and reflected from the water surface. The reflected wave is received by the E-
Flow and is then converted into an electrical signal, which is processed and the Doppler frequency shift is
measured.!
E-Flow Radar Flow Meter Manual V1.24 "" """"2
1.2.2 Principle Depth Of Flow Measurement
The E-Flow radar level sensor uses highly accurate pulse coherent radar (PCR) technology. The micro-strip
planar antenna emits very narrow microwave pulses (unlike typical ultrasonic sensors that have a large
measuring angle). The E-Flow PCR level sensor reflects the signal off the water surface measuring the time
interval for the signal to travel. The time interval between the transmitted pulse and the received pulse is
proportional to the distance between the sensor and the surface of the water. !
Due to the extremely high propagation speed of electromagnetic waves from the E-Flow, the time interval
between the transmitted pulse and the received pulse is very small. Compared with the traditional ultrasonic
level sensors. The E-Flow further improves the accuracy of depth by using developed modulation and
demodulation technology. Through the pulse coherence method, the E-Flow accurately identifies the time
interval and phase difference between the transmitted pulse and the received pulse, greatly measurement
accuracy and repeatability. The E-Flow firmware the uses the onboard wave cancellation algorithm to carry
out a final check of accuracy and repeatability of the recorded depth.!
1.2.3 Flow Measurement Principle
The velocity and level measurements recorded by the E-Flow sensor is used to calculate the flow rate. Flow
rate (also known as Q, as the flow, or as throughput) is the amount of fluid moving through a channel or pipe
in a period of time. For example, if 100 litres of water move past the sensor in one minute, the flow rate is
100 litres per minute (LPM). !
To calculate the flow rate, two things are needed:#
The cross-sectional area of the wetted channel (A) and the average velocity (V).#
Cross-sectional area is determined using the dimensions of channel and the measured level.!
Average velocity is determined using the surface velocity (measured by the sensor) and empirical
equations. !
Flow rate is calculated by using the Continuity Equation: Flow Rate = Average Velocity x Area !
E-Flow Radar Flow Meter Manual V1.24 "" """"3
1.3 Specifications
1.3.1 Features
1. Compact rugged design.!
2. Zero contact with the flow. !
3. Zero chance of sensors ragging and causing costly overflows. !
4. Highly accurate and repeatable with simple operation and set up. !
5. Zero maintenance needed. !
6. Measure flow in high sediment or debris conditions.!
7. The IP68 rating ensures years of hassle free operation. !
8. Ultra low power consumption, solar power can be used, easy installation and maintenance-free;!
9. Ultra-low power consumption sleep mode, 12V power supply current is less than 30uA. (E-Flow-""
R).!
!
1.3.2 Wiring interface
1. 7-32V / 5.5-32V (optional) DC power supply; !
2. The working current and standby current are low, it can be powered by solar energy, which is
convenient for installation and maintenance-free;!
3. Lightning protection circuit, 6KV lightning protection. Thunderstorm days can effectively protect
equipment against lightning strikes;!
4. Support RS485, RS232, 4-20mA wired communication methods;!
5. 4G lte wireless communication.!
E-Flow Radar Flow Meter Manual V1.24 "" """"4
Pin Configuration
Pins
Colour
Instruction
1
Brown
7-32V / 5.5-32V (optional) DC power supply
2、6
Black ,White
GND
3
Green
TXD_A（232_TX/485_A+）
4
Red
RXD_B（232_RX/485_B-）
5
Yellow
IOUT（4-20mA positive electrode，Set aside）
!
!
As shown in the figure above, the flowmeter host consists of a flow velocity measurement sensor, a water level measurement
sensor, a data transmission interface, and a wireless data transmission antenna (optional).!
E-Flow Radar Flow Meter Manual V1.24 "" """"5
1.3.3 Size & Dimensions
The appearance size without antenna is 160 ×100 ×83.2 (unit: mm)!
!
E-Flow Radar Flow Meter Manual V1.24 "" """"6
2 Installation
2.1 Instrument installation method and direction
E-Flow Radar Flow Meter Manual V1.24 "" """"7
!
2.2 Site Selection
When choosing the installation site, ensure that the radar wave covers the water surface to avoid the
influence of floating objects, and back eddies. The measuring angle of the radar water level gauge is 8 °, and
the launch angle of the radar velocity meter is 12 °, as shown in the figure below;!
!
The relationship between the diameter and distance of the circle is shown in the following table:!
E-Flow Radar Flow Meter Manual V1.24 "" """"8
1. The selection of any flow monitoring location should follow these main principles:!
"1) The channel is straight, with in 10 diameters upstream and 5 diameters downstream of the monitoring
"location;!
"2) The water flow is smooth and even, and is not affected by the vortex, gate opening and closing.!
"!
2. For non-contact measuring equipment such as radar flowmeters, the installation points should avoid the
following positions!
"1) Avoid any change in the direction of flow, try to ensure that the flow direction is parallel to the
installation direction of the radar flowmeter!
!
E-Flow Radar Flow Meter Manual V1.24 "" """"9
Installation height (m)
Flowmeter covers diameter !
range (m)
Water level gauge covers diameter range
(m)
0.2
0.073
0.028
0.5
0.168
0.07
1
0.325
0.14
2
0.64
0.28
3
0.955
0.42
5
1.585
0.7
7
2.215
0.98
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