Magnetic Flow Meters For Wastewater

Magnetic Flow Meters For Wastewater

1. Working principle:


Electromagnetic flowmeters are widely used in wastewater treatment plants to measure the cumulative flow and instantaneous flow of wastewater. The working principle of these meters is based on Faraday’s law of electromagnetic induction.


Faraday’s law states that when a magnetic field is applied to a conductor, a voltage is induced in the conductor. With a magnetic flowmeter, a solenoid is mounted on the outside of the pipe and creates a magnetic field that penetrates the pipe and the flowing wastewater. Wastewater in pipes is a conductor and produces an induced voltage proportional to the velocity of the fluid.


Three electrodes inserted into the duct and facing each other are used. The electrodes are connected to a meter that measures the induced voltage. The signal generated by the instrument is then transmitted to the control system, which calculates the flow rate.


This meter offers several advantages over other types of flow meters. There are no moving parts in the pipes, which means they require minimal maintenance and have a longer lifespan. They can also measure the flow of wastewater containing solids and other impurities that will not clog the flow meter.


In summary, this type of instrument is a reliable and highly accurate wastewater flow measurement technology. Their working principle is based on Faraday’s law of electromagnetic induction and offers several advantages over other flow meters.


Wastewater flow meter

Irrigation water flow meter

water flow meter

DN800 water flow meter

18 inch magnetic water flow meter

6 inch Mag Flowmeter


2. Application scope:


Magnetic flow meters for wastewater are widely used in the wastewater treatment industry due to their high accuracy and ability to measure the flow of conductive fluids. Its rugged design makes it the first choice for harsh environments, ensuring reliable performance even in challenging conditions.


Its applications in wastewater systems range from measuring flow rates in primary and secondary treatment processes to monitoring wastewater discharges into natural water bodies. These meters are capable of accurate measurements.


The flow meter is also used to monitor the performance of pumps and other equipment in wastewater systems, allowing for efficient maintenance and reduced downtime. They are suitable for a variety of pipe sizes as the unit comes standard with: MODBUS, 4-20MA, Pulse, HART (optional) and can be easily integrated into existing control systems, making it a cost-effective addition to wastewater management solutions solution.


Plays a vital role in ensuring compliance with environmental regulations by providing accurate and reliable wastewater flow and discharge rate data. By using these meters, wastewater treatment plants can operate more efficiently, reduce costs and minimize environmental impact.


Generally speaking, wastewater flowmeters play a very important role in sewage, wastewater, pulp, slurry and farmland irrigation, and are the preferred equipment for measuring flow.


3. Selection criteria:


When choosing the appropriate flow device for wastewater measurement, you need to pay attention to the following factors.


⑴. One of the key factors to consider is the size of the meter. Depending on the size of the pipe, the gauge should be selected accordingly to ensure accurate readings. Another important factor is the material used to make the meter. Meters should be constructed of corrosion- and abrasion-resistant materials to withstand the harsh conditions of wastewater or corrosive liquids.


⑵. The accuracy of the instrument is also an important consideration. The instrument should be able to measure flow with high accuracy, with a maximum accuracy of 0.2%, to ensure the wastewater treatment process is effective. It is also necessary to consider the flow range of the liquid, the pressure, the properties of the medium (such as strong acid and alkali, solid particles in the liquid, food grade, etc.).


⑶. It is important to consider the size, lining material, electrode material, sensor body material, power supply method, etc. There are also factors such as measurement accuracy and the supplier’s supply and technical support capabilities. By selecting the most suitable magnetic flow meters for wastewater and the best suppliers through the above, your wastewater treatment facility can ensure optimal performance and efficient processes.


4. Lining selection:


Liner material

Main performance


Hard rubberGood elasticity and good wear resistance;mainly used to measure water, sewage, slurry and pulp etc.


Resistant to boiling hydrochloric acid, sulfuric acid, aqua regia, concentrated alkali and various organic solutions; food grade;It can be used in strong corrosive media such as concentrated acid, concentrated alkali and sanitary media.



Strong wear resistance; but not acid and alkali resistance;Mainly used to measure pulp and coal slurry with middle strong abrasion.


It has good negative pressure resistance and is food grade;

High temperature resistance up to 180℃


5.Electrode material selection:


Electrodes material

Main performance and application


Used in industrial water, domestic water, sewage, etc., with weak corrosion resistance;


It can measure all concentrations of hydrochloric acid below the boiling point and has strong corrosion resistance; it is also resistant to sulfuric acid, phosphoric acid, hydrofluoric acid, organic acids and other non-oxidizing acids, alkali, hydrochloric acid, etc.


Resist non-oxidizing acid, such as the mixture of nitric acid/chromic acid and sulfuric acid; and resist oxidizing salt, such as Fe3+, Cu2+ and other oxidizing agents like hypochlorite solution and sea water etc.


Resistant to seawater, various chlorides, hypochlorites, oxidizing acids (including nitrosonic acid), organic acids, alkali, etc., but not resistant to purified reducing acids (sulfuric acid, hydrochloric acid);


Good corrosion resistance, able to withstand all chemical media (including boiling hydrochloric acid, nitric acid and sulfuric acid below 175°C),

Stainless steel coated with tungsten carbide

Used to strong wearing mediums, but without corrosion.


6. Accuracy guaranteed:

We have professional calibration equipment and professional flow meter calibration engineers to ensure that each meter will be calibrated twice one-to-one before leaving the factory, ensuring an accuracy of 0.5%, with a maximum accuracy of 0.2%, for pipes above DN1000 (40″) caliber, the accuracy can reach 1%,


Professional flow meter calibration equipment


7. Goods packaging:

Pipe diameters of DN50 (2″) and below are packed in cartons (you can choose wooden box packaging for free)
Pipe diameters of DN65 and above are packed in wooden boxes.


Flowmeter packaging


8.Verification video:




1. Question: What media is the magnetic water flowmeter suitable for?

A: It can be applied to all conductive liquids, including strong acids and alkalis, liquid and solid mixtures.


2. Question: Are you a manufacturer?

A: Yes. We have more than 20 years of manufacturing experience and our products are exported to more than 80 countries around the world.


3.Q: How is the warranty of this instrument?

A: All our products are guaranteed for 24 months. If there are product quality problems, we can provide you with new equipment for free.


4. Q: What is the payment method? What are the payment terms?

A: We support TT payment, credit card online payment, Western Union payment, RMB payment, LC payment. Payment terms can be negotiated with our sales representative.

6. Q: Do you have stock?

A: Of course, we have sufficient inventory. If you need customized products, we also have sufficient raw materials and can complete production for you quickly and provide delivery. We also support OEM, ODM and other customizations.


If you have more questions, please contact us and we will have professional sales representatives to answer all your questions! ! ! !

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