Electromagnetic water meter

Introduction

Application

Technical Data

Installation

Introduction

Electromagnetic water meter is a kind of instrument for measuring the volume flow of conductive liquid based on Faraday's principle of electromagnetic induction. It has the characteristics of wide range, low initial flow, low pressure loss, real-time measurement, cumulative measurement, bi-direction measurement, etc. It mainly uses DMA zoning, online monitoring, water loss analysis and statistical settlement of water supply mains.

Advantages

1 No blocking parts inside of measuring tube, low pressure loss and low requirements for straight pipeline.
2 Variable diameter design, improve measurement accuracy and sensitivity, reduce excitation power consumption.
3 Select suitable electrodes and liner, with good corrosion resistance and wear resistance.
4 Full electronic design, strong anti-interference ability, reliable measurement, high accuracy, wide flow range.

Application

Electromagnetic water meter is a metering instrument specially designed for the actual requirements of water supply enterprises, specially designed for water industry, which can optimize water supply and ensure accurate water trade measurement and settlement. Practice has proved that electromagnetic water meter is the ideal choice to solve the measurement contradiction of large water users. In addition, electromagnetic water meters are widely used in chemical industry, environmental protection, metallurgy, medicine, paper making, water supply and drainage and other industrial technology and management departments.

City water supply

Farm irrigation

Waste water treatment

Oil industry

Pharmaceuticals industry

Water supply and drainage

Technical Data

Table 1: Electromagnetic water meter Technical Data

Executive standard

GB/T778-2018 JJG162-2009

Flow direction

Positive/negative/net flow

Range Ratio

R160/250/400（Optional）

Accuracy Class

1 class/2 class（Optional）

Nominal Diameter（mm）

DN50

DN65

DN80

DN100

DN125

DN150

DN200

DN250

DN300

Nominal Flow Rate（m3/h）

100

160

250

400

630

1000

1600

Pressure Loss

∆P40

Temperature

T50

Pressure

1.6MPa（Special pressure can be customized）

Conductivity

≥20μS/cm

Initial flow velocity

5mm/s

Output

4-20mA, Pulse

Flow profile sensitivity class

U5，D3

Electromagnetic compatibility

Connection Type

Flanged，GB/T9119-2010

Protection

IP68

Ambient temperature

-10℃～+75℃

Relative humidity

5%～95%

Installation type

Horizontal and vertical

Electrode material

316L

Body material

Carbon steel/ stainless steel (optional)

Grounding method

With or without grounding/grounding ring/grounding electrode (optional)

Product Selection

Base

Wireless IOT

Wireless remote transmission of flow and pressure

Remote transmission of flow and pressure

Output

GPRS/Nbiot

GPRS/ Nbiot/Pressure remote

RS485/TTL

Communication

CJT188,MODBUS

Power Supply

DC3.6V Lithium battery

Structure Type

Integral and remote type

Units

Accumulated flow:m3
Instantaneous flow:m3/h

Accumulated flow:m3
Instantaneous flow:m3/h Pressure:MPa

Accumulated flow:m3
Instantaneous flow:m3/h

Application

Can replace water meter, ultra-low pressure loss, no wear

Real-time and effective remote meter reading

Realize pipe network pressure monitoring and become an intelligent terminal for metering and monitoring to provide information for the water supply enterprise informatization construction (SCADA,GIS,modeling, hydraulic model,scientific dispatch)

Wired remote

Table 2: Measure Range

Diameter (mm )	Range ratio (R)Q3/Q1	Flow Rate(m3/h)
Diameter (mm )	Range ratio (R)Q3/Q1	Min Flow Q1	Boundary Flow Q2	Nomal Flow Q3	Overload Flow Q4
50	400	0.1	0.16	40	50
65	400	0.16	0.252	63	77.75
80	400	0.25	0.4	100	125
100	400	0.4	0.64	160	200
125	400	0.625	1.0	250	312.5
150	400	1.0	1.6	400	500
200	400	1.575	2.52	630	787.5
250	400	2.5	4.0	1000	1250
300	400	4.0	6.4	1600	2000

Installation

Installation environment selection
1. Stay away from devices with strong electromagnetic fields. Such as large motor, large transformer, large frequency conversion equipment.
2. The installation site should not have strong vibration, and the ambient temperature does not change much.
3. Convenient for installation and maintenance.

Selection of installation location
1. The flow direction mark on the sensor must be consistent with the flow direction of the measured medium in the pipeline.
2. The installation position must ensure that the measuring tube is always filled with the measured medium.
3. Select the place where the fluid flow pulse is small, that is, it should be far away from the water pump and local resistance parts (valves, elbows, etc.)
4. When measuring the two-phase fluid, choose the place which is not easy to cause phase separation.
5. Avoid installation in the area with negative pressure in the tube.
6. When the measured medium easily causes the electrode and the inner wall of the measuring tube to adhere to and scale, it is recommended that the flow rate in the measuring tube be no less than 2m/s. At this time, a tapered tube slightly smaller than the process tube can be used. In order to clean the electrode and measuring tube without interrupting the flow in the process tube, the sensor can be installed in parallel with a cleaning port.

Upstream straight pipe section requirements
The requirements of the sensor on the upstream straight pipe section are shown in the table. When the diameters of the upstream and downstream straight pipe sections are inconsistent with those of the electromagnetic cold water meter, the tapered pipe or the tapered pipe should be installed, and its conical Angle should be less than 15° (7° -8 ° is preferred) and then connected with the pipe.

Upstream resistance components	Note: L is straight pipe length
Straight pipe requirements	L=0D can be considered as a straight pipe section	L≥5D	L≥10D

Note :(L is the length of straight pipe section, D is the nominal diameter of sensor)