Sewage Flow Meters

Sewage Flow Meters- Wastewater Flow Meters

Sewage flow meter, also known as a wastewater flow meter. The sewage flow meter measures the flow of various sewages in pipes and open channels. Common sewage flow meters are magnetic flow meters, non-contact ultrasonic flow meters, etc.

Industries like wastewater, river water, industrial gas.

What is wastewater flow?

Sewage flow or wastewater can be a pain to accurately measure. The environment is corrosive and humid. While the flow itself can experience wide swings due to inflow and infiltration. Wastewater is usually carried in non-full open channel pipes.

So, all the flow measurement instruments suitable for Sewage flow are called Sewage flow meters, or wastewater flow meters.

Here you can find a Sewage flow meter to measure the flow of wastewater for your application.

How is wastewater measured?

Magnetic flow meters

The electromagnetic flowmeter is based on Faraday’s law of electromagnetic induction. That is, the measured medium flows perpendicular to the direction of magnetic lines of force. Thus generating an induced electromotive force in a direction perpendicular to the flow of the medium and the lines of magnetic force.

Extended reading: Industrial Magmeters

The induced electromotive force is proportional to the measured medium flow, and the instantaneous flow rate can be obtained by using the flow rate, and the cross-sectional area of ​​the pipe.

The conductivity in water is one of the prerequisites for the electromagnetic flowmeter to work properly.

The sewage contains a large number of impurities and salt and has a certain conductivity.

Therefore, the electromagnetic flowmeter can be used for sewage measurement.

For pure water, it cannot be measured with an electromagnetic flowmeter.

The advantages of the electromagnetic flowmeter are high precision, stable measurement and wide application range.

The electrode and the inner lining can be selected according to the medium, and can also be used for measuring work in a bad medium.

The disadvantage is that it is easily interfered by electromagnetic waves, and the diameter of the pipe is larger.

The more expensive the price, the larger the diameter of the electromagnetic flowmeter is not easy to disassemble, and the maintenance is difficult.

Guess you like: Magnetic Flow Meters technical guide|What is &How they work? 

Ultrasonic flowmeter

Ultrasonic Flow Meters

The working principle of the ultrasonic flowmeter (Best Guide to Ultrasonic Level Transmitter) is that, by means of the time difference measurement principle. A pair of ultrasonic probes transmit signals through the intermediate medium to the other side of the tube wall and are received by the other probe. And the other side of the probe also transmits a signal to be the first one.

Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

The probe is received. In this process, since the signal delivery time is affected by the medium flow rate, there is a certain time difference.

Based on this, the ultrasonic flowmeter calculates the corresponding flow value by means of the relevant formula.

In general, ultrasonic flow meters can be divided into two types: external clip type and plug-in type.

If the length of the straight pipe before the flowmeter does not meet the installation requirements, a multi-channel ultrasonic flowmeter can be installed.

Compared with the electromagnetic flowmeter, the installation of the ultrasonic flowmeter on the large diameter (especially the large diameter of 1 m or more) has obvious advantages, and the construction is not difficult, the cost is relatively low, and the maintenance is convenient.

The external clip-type ultrasonic flowmeter (Ultrasonic flow measurement) is easy to carry and install.

Extended reading: 2 inch Water Flow Meter

Open channel flowmeter

Most of the sewage treatment plant sewage discharge methods are natural flow, that is, the flow of sewage in the pipeline or in the pipeline is not full.

A waterway that flows in such a non-full-tube state, that is, a waterway with a free surface, is called an “open channel.”

Even in the so-called “dark channel” waterway, since the liquid flows naturally, it also belongs to the open channel.

For such waterways, conventional pressurized full flow meters cannot be used when measuring flow.

The measured sewage contains various impurities and other organic chemical components.

Although it has been purified before the sewage is discharged, if a flow meter is used in direct contact with the sewage medium, scaling will inevitably occur inside the flowmeter after a long time.

Or the situation of being corroded, thus affecting the smooth progress of the measurement work.

The advantage of the open channel flowmeter is that the measuring range is large, and the flow measurement is not affected by the return of the tributary surface, the sediment in the water, the bubbles, and the water level. And the flow sensor will have resistance to the water flow, the structure is simple, the volume is small. And the installation is Convenience.

It is used in the Pearl River Delta area. The standard channels do not need to be modified, they can be installed directly, and the installation and construction costs are low. Therefore, it is suitable for measuring the discharge of sewage from sewage treatment plants.

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

Orifice flowmeter

The throttling flowmeter is a metering device, for metering flow that has been used in many previous years. It has the longest history and the most usage.

Nowadays, the common type is the circular orifice type and the tapered inlet plate type.

The working principle is to participate in the one-plate saving part in the fluid pipeline, and the pressure difference transmitter is introduced through the pressure guiding tube to measure the pressure difference between the upstream and the downstream of the saving piece.

According to the measured pressure difference, the instantaneous value of the flow is obtained by accounting.

Because of the inactivity of the water in the pressure guiding tube, in the colder area, the orifice tube of the outdoor equipment in winter is simply frozen (frozen), so that the differential pressure instrument cannot work normally.

When measuring dirty sewage, the orifice plate needs to be cleaned frequently.

If the cleaning is not timely, the measurement accuracy is reduced, and the pressure tube is often blocked by dirt, and the appearance cannot be used.

When the flow rate is measured by the orifice plate method, there are disadvantages such as large pressure loss and large protection amount.

Therefore, by changing the pressure-receiving method, for example, by using the radial pressure method, the influence of the fouling of the orifice plate can be reduced.

Widely used in environmental protection, metallurgy, chemical, pharmaceutical, water supply, food, paper, and other industries.

Read more about Sanitary Flow Meters-316SS, Tri clamp-Pulse- for Brewery

Sewage Flow Meter Selection

Before you make the selection of sewage flow metering instruments.

According to the actual situation of the site and the comparison of different flowmeters:

  1. Electromagnetic flowmeter measurement stability, a wide range of applications, can measure a variety of media, but is susceptible to electromagnetic interference. As the diameter of the pipe increases, its price will become more and more expensive.
  2. Ultrasonic flowmeter has low cost, high measurement accuracy, stable operation, convenient installation and maintenance, and the price will not become higher and higher with the increase of pipe diameter, but it will become more and more expensive due to the increase of sound path.
  3. The open channel flowmeter has a wide measuring range, and the flow measurement is not affected by the change of the medium, but it is limited by the size of the measuring tank.

Read more about: Shop 101: Key Factors In Selecting A Pipe Flow Meter

Generally speaking, in the case of meeting the open channel installation conditions, the flow data is large, and the sewage flow can be transported through the open channel.

And the sputum flowmeter and the trough flowmeter are used for related operations.

In the actual measurement process, such equipment can meet the accuracy requirements of metering and save energy.

It uses a self-flowing method to transport sewage.

Extended reading: Industrial VS Residential inline water flow meters

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Ultrasonic Flow Meter

Clamp on type Ultrasonic Flow Meter is the easiest to install. Convenient measurement. Handheld type optional.



Ultrasonic open channel flowmeters are used to measure flow in the sewer. In the case of a very small water flow, it can be matched with a triangular weir. Its basic structure is to install a weir groove at the outlet of the pipeline, which can be fixed with expansion screws. Finally, use structural glue to plug the surrounding gaps. Ensure that water does not seep from the place where the weir trough and the outlet pipe are connected.

As for how to install the ultrasonic open channel meteor on the weir trough, it is the same as usual. It’s just that the sewer may require battery power. It also needs to be equipped with a wireless RTU. This is also a way to measure the flow in a water channel when the water flow is very small.

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

For the selection of sewage flow meters, various flow meters have their own advantages and disadvantages. In the process of sewage treatment, selection should be made according to actual needs.

The electromagnetic flowmeter is stable in measurement, has a wide range of applications, and can measure a variety of media. But it is easily interfered by electromagnetic waves. As the pipe diameter increases, its price will become more and more expensive.

Ultrasonic flow meters have relatively low cost and high measurement accuracy. run smoothly. Installation and maintenance are convenient, and the price will not increase with the increase of pipe diameter. But it will become more and more expensive because of the increase in sound channels.

The open channel flowmeter has a wide measurement range, and the flow measurement is not affected by changes in the medium. , But it is restricted by the size of the measuring tank. Generally speaking, when the installation conditions of open channels are met, the traffic data is large. Sewage flow operations can be transported through open channels. Weir flow meters and trough flow meters are used for related operations.

Extended reading: sludge level measurement

Flow Metering Principals

  • Differential Pressure Flowmeters
  • Velocity Flowmeters
  • Positive Displacement Flowmeters
  • Mass Flowmeters
  • For Open Channel Flowmeters – weirs, flumes, submerged orifices, current meters, acoustic flow meters and more

For different working principle, We offer different types of flow meters, like:

  • Differential Pressure Flow Meters
  • Orifice Plate
  • Venturi Tube
  • Flow Nozzles
  • The Sonic Nozzle – Critical (Choked) Flow Nozzle
  • Calorimetric Flowmeter
  • Ultrasonic Doppler Flowmeter
  • Positive Displacement Flowmeter
  • Variable Area Flowmeter or Rotameter
  • Velocity Flowmeters
  • Pitot Tubes
  • Electromagnetic Flowmeter
  • Turbine Flowmeter
  • Vortex Flow Meter
  • Thermal Flowmeter
  • Coriolis Flowmeter
  • Mass Flowmeters
  • Open Channel Flowmeters

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Sino-Inst offers sewage flow meter products. About 85% of these are Magnetic flow meters, 3% are Ultrasonic water meters. A wide variety of sewage flow meter options are available to you, such as free samples, paid samples.

The top-selling countries or regions are China, India, and Israel, which supply 99%, 1%, and 1% of sewage flow meter respectively. Sewage flow meter products are most popular in Domestic Market, Mid East, and North America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and Other certifications.

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Insertion Magnetic Flow Meter

Insertion Magnetic Flow Meter, also called insertion electromagnetic flow meter, is an insertion type flow meter. Insertion magnetic flowmeter can be installed without stopping the flow. Suitable for large diameter DN300-3000.

Insertion Magnetic Flow Meter adopts pressure tapping and installation technology. Insertion electromagnetic flow meter is composed of insertion electromagnetic sensor and electromagnetic flow converter.

Installation can be divided into an online installation type of the cut-off valve, and water control installation type without stop valves. The Insertion Magnetic Flow Meter is suitable for measuring the volume flow of various conductive liquids in the pipeline. It can also be used to measure corrosive conductive liquids such as acid, alkali and salt.

Sino-Inst offers a variety of  Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

Features of Insertion Magnetic Flow Meter

Compared with the pipe segment electromagnetic flowmeter, the advantages of Insertion Magnetic Flow Meter:

  1. No need to cut off the water, cut off the pipeline, install directly on the old pipeline;
  2. Easy to disassemble during maintenance;
  3. Especially suitable for large-diameter pipelines, with high cost performance;
  4. The accuracy is lower than the flange type, and it is mostly used for process control rather than measurement;
  5. It can be made into one-piece or component pose;
  6. The Insertion electromagnetic structure can be easily installed and disassembled without stopping the water under low pressure or under pressure. Therefore, it is very suitable for the fluid measurement of existing pipelines and facilitates the maintenance and repair of instruments.
  7. The measurement accuracy is not affected by changes in physical parameters such as the temperature, pressure, density, viscosity, conductivity (as long as the conductivity is greater than 20μs/cm) of the measured medium.
  8. The sensor has almost no pressure loss and extremely low energy loss.
  9. Large flow measurement range. The full-scale flow rate in the measured pipe can be set arbitrarily from 1m/s to 10m/s, and the output signal has a linear relationship with the flow rate.
  10. The flowmeter not only has 0~10mA or 4~20mA standard current output, but also 1~5kHz frequency output

Specifications of insertion electromagnetic flowmeter

Medium Water, sewage water, acid, alkali, etc.    
Diameter Dn300~DN3000mm    
Accuracy ±2.5%    
Temp. range -20~+150℃    
Pressure 1.6 MPa    
Flow rate 0.5~6m/s    
Straight pipe required Upstream≥5DN, downstream≥3DN    
Electrode 316L,Hastelloy C(HC), Titanium(Ti), Tantalum(Ta),Platinum(Pt)    
Installation way Without a ball valve or with a ball valve    
Body material Stainless steel    
Power supply 220VAC/24VDC/Lithium battery    
Signal output Pulse output, 4~20mA    
Communication RS485,Hart, GPRS etc.    
Explosion-proof No    
Protection class IP65(compact type), IP68(remote type)    
Working environment Temp. Range: -20~+60℃,  humidity: 5%~90%    

Applications of Insertion Magnetic Flow Meter

  • Potable Water
  • Water Distribution
  • Pumping Stations
  • Filter Balancing and Backwash
  • Reclaim Water
  • Treated Water
  • Irrigation Water
  • Cooling Water
  • Raw Water

Extended reading: 2 inch Water Flow Meter

Insertion magnetic flow meter principle

All MAG Meters operate under the same fundamental principle of classical physics (Faraday’s Law of Electromagnetic Induction):

E = CONSTANT x B x D x V

The law states that the magnitude of the voltage (E) induced in a conductive medium, moving through a magnetic field is directly proportional to the strength of the magnetic field (B), the path length between the probes (D), and the velocity of the medium (V).

In principle and implementation, it is possible to fix all parameters except velocity.

Thus a MAG Meter responds only to “velocity” and is extremely insensitive to changes in fluid conditions (density, viscosity, etc.) and application constraints (pressure, temperature, and mechanical vibrations, as well as fluid pulsation).

The operation of a MAG Meter is completely analogous to an electrical generator.

A voltage is induced in a conductor that is moving at right angles through a magnetic field.

The faster the conductor moves, the more voltage is generated.

You may want to know more about: Magnetic Flow Meters technical guide|What is &How they work? 

Advantages of Magnetic Flowmeters

Electromagnetic (MAG) flowmeters have been widely used in industry for over 50 years.

And for good reason, the advantages of MAG meters are irrefutable.

  • High reliability – no moving parts
  • No scheduled maintenance
  • Good accuracy: 0.5% to 2.0% of reading
  • Very wide range: up to 100:1
  • No pressure drop
  • The wide selection of materials
  • The wide selection of fluids metered

Extended reading: Industrial Magmeters

Typical Installation of Insertion Magnetic Flow Meter

Easy To Install

  1. Place saddle and ball valve
  2. Hot tap
  3. Insert meter and set the depth
  4. Tighten clamp
  5. Provide electrical Ground connection on plastic pipes

Extended Reading: Special Magnetic Flowmeter Installation situation

Choice of installation environment

  1. It should be installed at the lower part of the horizontal pipeline and vertically upwards, avoid installing at the highest point of the pipeline and vertically downwards;
  2. It should be installed on the rising part of the pipeline;
  3. Installation in the open discharge pipe should be installed at the lower part of the pipe;
  4. If the pipeline drop exceeds 5m, install an exhaust valve downstream of the sensor;
  5. The control valve and shut-off valve should be installed downstream of the sensor, not upstream of the sensor;
  6. The sensor must not be installed at the inlet and outlet of the pump, it should be installed at the outlet of the pump.
  7. Keep away from equipment with strong fields, such as large motors and large transformers.
  8. There should be no strong vibration in the installation place, and the pipeline should be firmly fixed. The ambient temperature should not change much.
  9. The installation environment should be easy to install and maintain.

Choice of installation location

The installation location must ensure that the pipeline is always filled with the fluid under test.
Choose a place where the fluid flow pulse is small, that is, away from the pump, valves, elbows and other local resistance parts.

When measuring two-phase (solid, liquid or gas, liquid) fluids, choose a place that is not easy to cause phase separation.

Avoid negative pressure at the measurement site.

The diameter or circumference of the side pipe is easy to measure, and the ovality should be small.

Length of straight pipe

The length of the straight pipe section on the upstream side of the sensor installation pipeline should be greater than or equal to 10D, and the downstream side should be no less than 5D (D is the diameter of the pipeline being tested).

The flow control valve should be installed on the pipe under test on the upstream side of the sensor, and the flow control valve should be installed on the downstream side of the sensor. When measuring, usually the flow control valve should be fully open.

Installation method

Vertical installation, when the sensor is inserted into the pipeline, it should be perpendicular to the central axis of the pipeline, and the included angle with the pipe section is less than 50. It is suitable for measuring clean media with small pipeline vibration.

There are two ways to insert the insertion point of the electromagnetic flow sensor. One is to insert at 1/4 of the inner diameter of the pipe. The other is to insert at 1/2 of the inner diameter of the pipe.

Correctly weld the mounting base to the pipe. Clean up welding slag and burrs on the mounting base of the pipe under test.

Turn off the upstream flow control valve or use a low-pressure water supply.

Install the DN50 ball valve on the mounting base. Note that the long cavity of the ball valve faces upwards. Check whether the ball valve can be fully opened and closed. If there is any problem, repair it. Install the compression threaded seat, compression nut and rubber sealing ring on the ball valve. Loosen the positioning screw and the compression nut, and insert the sensor through the ball valve into the pipe under test. Tighten the compression nut and the positioning screw, and at the same time, pay attention to the insertion direction of the sensor direction sign and the fluid flow direction.

Insertion depth

(1) When selecting the electrode to insert to the average flow rate, the average flow rate point is about H=0.25D from the pipe wall (D: pipe inner diameter) according to the pipeline turbulent flow conditions. Press the handle to make the insertion rod enter the pipe H deep. (L2 at this time = original L2-H)

(2) After confirming that the insertion depth is correct, turn the flow direction rod to make its connection parallel to the centerline of the pipeline. At this time, the connection between the two electrodes will be perpendicular to the centerline of the pipeline. That is, the connection between the electrodes is perpendicular to the flow rate.

(3) After adjustment, first tighten the lock nut firmly, and then tighten the three locknuts separately. One of their functions is to ensure that the insertion rod is not pushed out by the pressure in the tube. The other is to ensure that the insertion rod does not vibrate.

(4) During actual on-site installation, the insertion depth is only allowed to be 0.25D, which is a quarter of the diameter of the pipe. The insertion depth is 0.5D, which is the center of the pipe.

(5) Loosen the fastening screws under the junction box. Rotate the junction box to the position you are satisfied with and tighten the nuts.

The Insertion flowmeter is a type of flowmeter divided by structure. It includes various flowmeters with different working principles.

Usually, the flowmeter and the pipeline are flanged. Only when the processing pipeline is cut off is allowed to be disassembled, repaired, and replaced. This has a great impact on the reliable operation of the system. The Insertion flowmeter fundamentally solves this defect. Although the measurement accuracy is slightly lower. But on some large-caliber occasions, Insertion flowmeters have been used to measure the total amount of fluid.

There are many forms of Insertion flowmeters that have been promoted. According to the working principle of Insertion flowmeter detection heads, they can be divided into Insertion turbine, Insertion vortex, Insertion electromagnetic, uniform velocity tube, and thermal flowmeter. The number of measuring points of the Insertion flowmeter can be divided into two categories: point flow type and runoff type.

The accuracy of the magnetic flowmeter has been calibrated by the calibration line when it leaves the factory. However, at the use site, due to environmental conditions, fluid characteristics, and instrument damage such as component damage. It often causes instrument operation failures. Therefore, the electromagnetic flowmeter needs calibration. Ensuring accurate flow meter performance is an inestimable part of business planning and costing.

More Featured Insertion flowmeters

At present, there are many kinds of Insertion flowmeters in use. According to the working principle of the Insertion flowmeter detection head, it can be divided into Insertion turbine, Insertion vortex, Insertion electromagnetic, Insertion ultrasonic, and Insertion target flowmeter.

The correct choice of the flowmeter is of great significance for flow measurement. Choosing different flow meters under the same working conditions will definitely have a considerable difference in the final measurement results.

If the initial selection is improper, it may even lead to the inability to perform quantitative measurements and cause damage to the instrument. Therefore, it is necessary for users to have a correct understanding of how to choose a suitable flow meter. Knowing some basic selection methods will help make mistakes when choosing meters.

In order to ensure the use of the flow meter in the production site process. The choice of flowmeter, in general, must be determined according to the medium that needs to be measured at the production site.

The advantages of the insertion vortex flowmeter are particularly good anti-vibration performance, no zero drift, and high reliability. Through a large number of waveform analyses and frequency spectrum analyses on the vortex flowmeter for a long time, the probe shape, wall thickness, height, probe rod diameter, and matching piezoelectric crystals are designed.

Insertion Vortex Flow Meter

It adopts an advanced numerical control lathe for processing. It ensures the coaxiality and smoothness of processing and other technical parameters and cooperates with special processing. It overcomes the common problem of the influence of the inherent self-oscillation frequency of the vortex flowmeter on the signal.

The insertion vortex flowmeter is mainly used for the flow measurement of large-caliber gas, liquid, and steam medium fluids in industrial pipelines in various industries.

It is characterized by small pressure loss, a large measuring range, and high accuracy. It is almost not affected by fluid density, pressure, temperature, viscosity, and other parameters when measuring volume flow under working conditions.

Insertion ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam shift method, Doppler method, and cross-correlation method according to the principle of signal detection. , Spatial filtering method and noise method, etc.

Ultrasonic Insertion Flow Meter

Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because the flow channel of the instrument is not equipped with any obstructions, it is an unobstructed flowmeter. It is a type of flowmeter suitable for solving difficult problems in flow measurement. Especially in large-caliber flow measurement. The advantages.

Insertion ultrasonic flowmeter is mainly used in petroleum, chemical industry, metallurgy, electric power, water supply, and drainage, and other fields.

The structure of the Insertion turbine flowmeter is an explosion-proof design. It can display the total flow, instantaneous flow, and the percentage of flow full scale. The battery adopts a long-term lithium battery. The battery life of a single-function integrator can reach more than 5 years, and the battery life of a multi-function indicator can reach more than 12 months.

Turbine Insertion Flow Meter

Insertion turbine flowmeter can display many flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc. The fixed pressure and temperature parameters can be set to compensate for the gas. For occasions where the pressure and temperature parameters do not change much, the instrument can be used for fixed compensation accumulation.

Insertion turbine flowmeters are mainly used in metering and control systems in the fields of petroleum, chemical industry, metallurgy, scientific research, and so on.

The Insertion target flowmeter is based on the traditional target flowmeter. With the development of new sensors and microelectronics technology, a new type of capacitive force induction flow Insertion target flowmeter has been developed. It has the characteristics that the flowmeter has no movable parts such as an orifice plate and vortex street. At the same time, it has high sensitivity and accuracy comparable to positive displacement flow meters. The measuring range is wide.

Target Flow Meter

Insertion target flowmeter has good adaptability in the working conditions of small flow, high viscosity, easy to condense and easy to block, high and low temperature, strong corrosion, strong vibration and other flow measurement difficulties. Mainly used for flow measurement in various fields such as metallurgy, petroleum, chemical industry, energy, food, and environmental protection.

More Featured Wastewater Flow Meters

More about: Sewage Flow Meter Selection

Sino-Inst offers all kinds of flow meters, which can work for the wastewater.

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Sino-Inst offers 10 Insertion Magnetic Flow Meters. A wide variety of  Industrial flow meters options are available to you. such as free samples, paid samples.

Sino-Inst is an Industrial flow Transmitter supplier, located in China. The top applying countries are China (Mainland), Hong Kong, and the United States, which supply 96%, 2%, and 1% of wireless pressure transmitters respectively.

Insertion Magnetic Flow Meter products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

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