What should be paid attention to when choosing a flowmeter for sewage treatment?

Proper installation of the sewage flow meter contributes to the stable operation of the equipment, and the installer needs to operate it correctly in the following four aspects.

1. Environmental selection.

Try to stay away from equipment with strong electromagnetic fields, such as large motors, large transformers, large frequency converters, etc. There should be no strong vibration in the installation site, the pipeline is fixed firmly, and the ambient temperature does not change much (to prevent the change of solid and liquid phases). The installation environment should be easy to install and maintain.

2. Location selection.

The installation position must be such that the pipe is always filled with the liquid to be measured.

Choose a place with a small liquid flow pulse, and keep away from local resistance parts such as pumps, valves, and elbows.

When measuring biphasic (solid, liquid, gas, liquid) liquids, it is important to select a place where phase separation is not likely to occur.

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

3. The length of the straight pipe section.

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 not be less than 5d (d is the diameter of the pipeline to be measured).

4. Flow control valve and regulating valve.

The flow control valve should be installed in the pipeline to be measured on the upstream side of the sensor, and the flow control valve should be installed on the downstream side of the sensor.

When it comes to flow, usually the flow control valve should be fully open.

Jiangsu Feiyun Instrument has 10 years of experience in the development of flow meters, sludge concentration meters, natural gas flowmeters, steam flowmeters, oxygen flowmeters and sewage flowmeters. With first-class and experienced professional and technical personnel in the industry, we pay attention to the excellent quality of products, attach importance to after-sales service, and regard it as our responsibility to ensure that users use products with zero risk.

It requires the advantages of small pressure loss, no mechanical inertia, and sensitive response, and is widely used in sewage treatment turbine flowmeters.

This piece can choose an electromagnetic flowmeter. High precision, long service life, can also be made into anti-corrosion. A private message is required.

Look at the caliber, medium, temperature, pressure, choose the right electrode, lining,

1. Application of sewage electromagnetic flowmeter.

Large-diameter electromagnetic flowmeters have a wide range of applications in water supply and drainage engineering. According to the use, it can be divided into large diameter, small diameter, small diameter and small diameter. Medium and small diameter measuring instruments are often used in places where it is difficult to measure fluids or have high requirements, such as the measurement of pulp and black liquor in the paper industry, the measurement of non-ferrous metal metallurgical slurry and coal slurry, etc.

Coal preparation plants, chemical enterprises and industries with strong corrosive liquids, iron and steel companies carry out blast furnace tuyere cooling water system control, long-distance pipeline coal hydraulic transmission network flow measurement and control, etc. Small calibers and small calibers are often used in fields that require health, such as medicine, food, and bioengineering.

2. The accuracy level and function of the sewage electromagnetic flowmeter.

Some of the high-precision, versatile, and versatile EMFs on the market make a big difference in performance. Some work with low precision, and the function is simple to perform. The basic error of high-precision instruments is ( , and the basic error of low-precision instruments is ( ** difference of 12 times.

Therefore, it is not cost-effective to select a high-precision instrument that does not require high measurement accuracy (e.g., non-accounting, only high reliability and good and bad repeatability for control purposes). Basic Information Error ( However, due to the absence of stringent equipment requirements and important reference to other conditions, there are different models of instruments that claim to have a higher accuracy.

3. The conductivity of the liquid return file of the sewage electromagnetic flowmeter.

The premise of EMF is that the liquid to be measured must be electrically conductive and not below a threshold (lower limit). Conductivity below the threshold will have an impact on the measurement of systematic error even we can not use, even if there is no change to develop beyond the threshold can be measured, the error value changes little to the effect, generally the threshold of EMF is 10 of -4 (5x10 of -6)s cm, depending on the model. The use also depends on the flow rate between the temperature sensor and the converter, the length of the signal line and its main distribution, and the capacitance.

In the manufacturer's instruction manual, we usually specify the length of the signal line corresponding to the conductivity. Instruments with non-contact, capacitively coupled, large-area electrodes can measure liquids with conductivity as low as 5x10-8s cm.

4. The flow, full flow, range and caliber of the sewage electromagnetic and flowmeter.

It should depend on the flow rate. The process is carried out by industrial enterprises to transport water and other liquids with different viscosities of users, and the diameter of the selected instrument may be different from the diameter of the pipe. The design flow rate of the pipeline is generally carried out at the economic horizontal flow rate of EMF.

In this tube, the sensor diameter can be the same as the tube diameter. For fluids that are easy to adhesion, accumulation, scaling and other substances, the flow rate is generally not less than 2m s and should be increased to more than 34m envy s as much as possible to play a self-cleaning role and prevent adhesion and chemical deposition. For abrasive fluids such as pulp, the general flow rate should be less than 23 ms to reduce the wear of the liner and electrodes.

Electromagnetic flowmeter can be used to treat sewage, and the electromagnetic flowmeter is easy to adapt to the complexity of sewage treatment, regardless of whether it contains corrosion, this will not affect the use of electromagnetic flowmeter.

Selection of electromagnetic flowmeter].

1.Selection of the type of flow meter.

Electromagnetic flowmeters are divided into two types: split type and integrated type according to the structural form. The basic principle of choosing a split type or an integrated type is: when the flowmeter is used under complex environmental conditions (such as high-temperature fluids, high-temperature gases, places with violent vibration and places where water may be submerged, etc.), the split type structure should be selected.

In general, an integrated electromagnetic flowmeter can be used under good environmental conditions.

2.Select according to the measuring fluid.

Electromagnetic flowmeters can only be used to measure conductive liquids, not non-conductive fluids such as gases, oils, and organic chemicals. For fluids with a conductivity of more than 5s cm, just choose a general type of instrument. For liquids above conductivity, slurry fluids containing solid particles and fibrous, capacitive electromagnetic flowmeters can be used.

3.Select a flow meter according to the application.

Electromagnetic flowmeters are divided into submersible type, explosion-proof type, sanitary type, high-pressure type and general type according to their use. The submersible type is generally used for open channel flow measurement; The explosion-proof type is used in the environment that may have the highest quality, such as often used in coal mines, chemical industry, oil fields and other environments; The hygienic type is characterized by easy disassembly, rinsing and disinfection, and can be quickly installed, suitable for food and pharmaceutical departments; The high-pressure type is used for the measurement and control of liquid flow such as drilling circulating mud, cementing cement slurry, hydrochloric acid in fracturing acidization process, and high-pressure water injection in oil production process; The general type is used for general purposes other than those mentioned above.

Since the measurement of Famet electromagnetic flowmeter is not affected by the density, temperature, pressure, viscosity, Reynolds number and conductivity changes of the fluid within a certain range; Improving the accuracy of flow measurement can be used in the paper industry.

In general, electromagnetic flowmeters are used more, relatively speaking, stable and reliable, data is easy to transmit.

Among them, there are several points, and now all provinces have proposed to standardize the remediation of the outlet, and in this case it is better to choose the babbiter groove for the outlet.

For the metering of dosing devices, individuals still prefer rotameters.

Famet electromagnetic flowmeter has the advantages of small pressure loss, no mechanical inertia, sensitive response, etc., and is widely used in sewage treatment.

The electromagnetic flowmeter from Cowell, Germany is good, you can try it.

It seems that there is no flow meter called sewage! Some manufacturers have made it up. The main flowmeters for measuring sewage are electromagnetic flowmeters, rotameters, vortex flowmeters, etc.

The landlord can choose the most suitable flowmeter according to the working conditions (flow, diameter, temperature, pressure, accuracy) combined with the performance of the flowmeter. If you really can't fix it, I'll help you solve it, it's free!

It is best to use a turbine flowmeter and find a manufacturer, so that the quality and quality are guaranteed.

It is best to use an electromagnetic flowmeter, I recommend Shanghai Huaqiang Instrument, I used it, and the performance is good.

1. The sewage flowmeter should be installed at the lower part of the horizontal pipeline and the vertical upward place, and avoid being installed at the highest point and vertical downward part of the pipeline; Respect for spring.

2. The sewage flowmeter should be installed at the rising place of the pipeline;

3. The installation in the open discharge pipeline should be installed at the lower part of the pipeline;

4. If the pipeline drop exceeds 5m, install an exhaust valve downstream of the old device with poor sensing;

5. The electromagnetic flowmeter should be installed with a control valve and a shut-off valve downstream of the sensor, but not upstream of the sensor;

6. The sensor must not be installed at the inlet and outlet of the pump, but should be installed at the outlet of the pump;

7. The way of installing the electromagnetic flowmeter in the measuring well;