Partially Filled Pipe Electromagnetic Flow Meter

RBEF-P Type Partially filled(Open Channel) electromagnetic flow meter is a flow automatic measuring instrument use for continuous measurement in open pipeline(such as semi-flow sewer pipes and large-flow pipes without overflow weirs  or mass flow pipe with none down flow weir) by velocity-area method. 

RBEF-P Type Electromagnetic Partially Filled Pipe Flow Meter is composed of an electromagnetic flow rate sensor, a liquid level sensor and a flow indicator.

 

It Continuously measures the flow rate and level of fluids in pipes. Users only need to input the inner diameter of a circular pipe or the width of a square pipe, and the Electromagnetic Partially Filled Pipe Flow Meter will automatically calculate the flow rate in the pipe. And automatically displays the instantaneous flow, flow velocity, cumulative flow and other measurement parameters in the pipeline.

It is especially suitable for the needs of metering places such as municipal rainwater, wastewater, sewage discharge and irrigation water pipes.

 



 

 


 


 

 

 

Description

  • Principle
  • Features
  • Specification
  • Model Selection
  • Applicants
  • Download
Principle

RBEF-P Type Partially filled (Open Channel) Electromagnetic Flow Meter(EMF) Principle:

 In the case of a partial-filled pipe, when the electromagnetic flowmeter measures the flow rate, as the fluid level height in the insulating pipe changes, the distribution of the flow is uneven, and the distribution of the weight function is also changing, so the change in the flowing liquid level leads to the accuracy of the measured flow rate. Therefore, in order to obtain accurate flow rate signal parameters, measuring the liquid level parameters is the key to solving the measurement of the electromagnetic flowmeter for non-full pipes. In this way, the flow rate signals at different liquid levels can be averaged according to the weight function. After obtaining the flow rate parameters and liquid level parameters, the measurement of the fluid flow in the case of a non-full pipe can be achieved.

1. Level meter measurement principle

This partial-filled tube electromagnetic flowmeter uses an ultrasonic level meter. Its working principle is to transmit energy waves through a device that can transmit energy waves (generally pulse signals). The energy waves are reflected by obstacles and a receiving device receives the reflected signals. The liquid (object) level change is determined by measuring the time difference of the energy wave movement process. The microwave signal is processed by an electronic device and finally converted into an electrical signal related to the liquid level. The primary probe transmits an ultrasonic pulse signal to the surface of the measured medium. The ultrasonic wave is reflected after encountering the measured medium (obstacle) during the transmission process. The reflected ultrasonic signal is detected by the electronic module. It is processed by special software, and the time difference between the emission of the ultrasonic wave and the echo is analyzed. Combined with the propagation speed of the ultrasonic wave, the distance of the ultrasonic wave propagation can be accurately calculated, and then the liquid level h can be reflected.

2 Flow rate measurement principle 

The flow rate measurement working principle of the partial filled tube electromagnetic flowmeter(EMF) is still based on Faraday's law of electromagnetic induction. When a conductor moves in a magnetic field, an induced electromotive force will be generated at both ends of the conductor in a direction perpendicular to the direction of the magnetic field and the direction of movement. The magnitude of the electromotive force is proportional to the conductor movement speed and the magnitude of the magnetic induction intensity. The fluid medium is equivalent to a conductor in motion. The direction of fluid flow is perpendicular to the direction of the electromagnetic field, and the induced voltage is proportional to the fluid flow rate.

Features

RBEF-P Type Partially filled (Open Channel) Electromagnetic Flow Meter(EMF) Features:

  • Nominal diameter range: DN100~DN1200;

  • Measurement accuracy:+ 2.5%FS, accurately measure the flow rate between 10% and 100% of the liquid level;
  • The measurement range is large, and the flow measurement is not affected by backwater of the tributary surface,
  • Multiple connection methods: GB, DIN, ANSI, installation length in accordance with ISO standard.
  • It is not affected by floating objects, sediment and bubbles in the water during measurement, and the flow sensor has little resistance to the water flow, with simple structure, compact dimensions, and easy installation 
  • Standard pipelines can be installed directly without transformation, and the installation and construction cost is low:
  • The electrodes are installed at 10%, 30% and 50% of the pipeline diameter and will be automatically chosen to calculate the flow velocity , so it will not be affected by the grease floating on the liquid surface,
  • Small blind zoom, high-precision level gauge;
  • Split converter: suitable for detached installation required by column or wall mounting.The instrument display and output function are various, which can display measurement data such as water level, flow rate, flow rate. cumulative flow rate. etc..
  • Various outputs include RS485, 4-20mA, pulse output.
Specification

RBEF-P Type Partially filled (Open Channel) Electromagnetic Flow Meter(EMF) Specification:

Measuring Pipe Size

DN100-DN1400

Connection

Flange

Liner Material

Neoprene/Others

Electrode  Material

SS316, TI, TA, HB, HC

Structure Type

Remote Type

Accuracy

2.50%

Output Signal

Modbus RTU, TTL electrical level

Communication

RS232/RS485

Flow speed range

0.05-10m/s

Protection Class

Converter: IP54

 

Flow Sensor: IP65(standard), IP68(optional)

 Display:



 Instantaneous flow, total flow, flow velocity, liquid level, etc.
Model Selection

RBEF-P Type Partially filled (Open Channel) Electromagnetic Flow Meter(EMF) Selection:

 

Partially Filled Pipe Electromagnetic Flow Meter  Model Selection  

RBEF-P

DN

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

-

 

 

 

1

 

2

 

3

 

4

 

5

 

6

 

7

 

8

 

9

 

10

 

11

 

12

 

13

 

14

15

 

 

1 Nominal Diameter(mm)/ [inches] (1)

0100 [4”]

0450 [18”]

 1400[56”]

 

0125 [5”]

0500 [20”]

 

0150 [6”]

0600 [24”]

 

0200 [8”]

0700 [28”]

 

0250 [10”]

0800 [32”]

 

0300 [12”]

0900 [32”]

 

0350 [14”]

1000 [40”]

 

0400 [16”]

1200 [48”]

 

 

 

 

 

 

 

2 Flange Rating (1)

10 

1.0 MPa  

100 … 1400 

20 

ANSI Class 150

100 …1400 

AA 

Special

 

 

 

 

 

3 Electrode Material 

1 

316L Stainless Steel

3 

Hastelloy C-22

4 

Hastelloy B-10

5 

Titanium

6 

Tantalum

S 

Special

 

 

 

4 Lining Material 

0 

Neoprene (Hard rubber)

≤ 3000 

1 

Neoprene (Soft rubber)

≤ 3000 

2 

PTFE

≤ 1000 

3 

Polyurethane

≤ 300 

S 

Special

 

 

 

 

 

5 Grounding and Lining Protection 

0 

Flange ground

15 … 800 

1 

Earth ring

15 … 250 

 2 

Ground electrode

50 … 800 

3 

Inlet protection ring

50 … 800 

 

 

 

 

6 Max. Process Temperature 

A 

80°C

All Linings 

 

 

 

 

 

7 Environmental Protection Class 

5 

IP65

8

IP68

 

 

8 Explosion Proofing 

1 

None

 

 

 

9 Configuration – sensor/transmitter   

R 

Remote (with 10m cable)(2)

X

Extend Xm cable

 

 

10 Power Supply 

A 

85~265V

 

 

 

11 Display and Programming

0 

Blind

3 

3 line LCD display + keypad programming

 

 

 

12 Output and Input 

0 

4-20mA+Pulse

1 

4-20mA+Pulse+Rs485

S 

Special

 

 

 

 

13 Calibration Specification 

1 

3 point, 2.5% accuracy

S 

Special

 

 

 

14 Flow Tube Configuration 

 

Flange Type

100 …1400 

D 

DIN

 

A 

ANSI

 

J 

JIS

 

0 

Others(pls clarify)

 

 

15. Flange +Body material 

C 

Carbon Steel

 

S 

304 Stainless Steel

 

 

 

 

 

Remark: 

(1) Line size selection will be inches for ANSI Class 150 rating selection, DIN size for all other ratings

(2) Order longer cable length separately;


Applicants

RBEF-P Type Partially filled (Open Channel) Electromagnetic Flow Meter(EMF) Applications:

  • Irrigation
  • Water and wastewater applications in partially filled and gravity feed pipes
  • Cost-effective replacement of expensive siphon tube constructions
  • Surface water
  • Biological and chemical wastewater
  • Combined and separate sewage systems
  • Combined sewer overflows 
  • Storm water overflows (SWOs)
  • Rainwater retention basins
  • Influent/intake at wastewater treatment plants
  • Effluent of wastewater treatment plants
  • Discharge to surface water
  • Industrial wastewater collection and return flows
  • Control and monitoring of cooling water
  • Water and wastewater industry
  • Chemical and other process industries
  • Rain water
  • Paper Industry
  • Public Drainage
  • Water Treatment
  • Etc..

 

 

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