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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.

Technical Data

Table 1: Model Selection Table

QTLD-X
Size	DN25-DN1000

Table 2: Measure Range

DN (mm)	(R)Q3/Q1	Flow（m³/h)
DN (mm)	(R)Q3/Q1	Q1	Q2	Q3	Q4
25	400	0.04	0.064	16	20
32	400	0.0625	0.1	25	31.25
40	400	0.1	0.16	40	50
50	400	0.1575	0.252	63	78.75
65	400	0.25	0.4	100	125
80	400	0.4	0.64	160	200
100	400	0.625	1	250	312.5
125	400	1	1.6	400	500
150	400	1.575	2.52	630	787.5
200	400	2.5	4	1000	1250
250	400	3.75	6	1500	1875
300	400	4	6.4	1600	2000
350	400	6.25	10	2500	3125
400	400	10	16	4000	5000
450	400	10	16	4000	5000
500	400	16	25	6300	7875
600	400	25	40	9922	12403
700	400	34.63	55.4	13850	17312.5
800	400	45.23	72.36	18090	22612.5
900	400	57.23	91.56	22890	28612.5
1000	400	70.65	113.04	28260	35325

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.