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Abstract: the electromagnetic flow meter scale excitation way what how to selection installation information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.

Electromagnetic flowmeter is mainly used for measuring the conductive liquid medium, and cannot be used for measuring gas, steam and liquid contains a lot of gas.

Affected by the velocity distribution, under the condition of axial symmetry distribution, traffic signal is proportional to the average flow velocity.
So, the electromagnetic flowmeter.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is how electromagnetic flowmeter scale excitation way what selection installation article details.

Electromagnetic flowmeter is mainly used for measuring the conductive liquid medium, and cannot be used for measuring gas, steam and liquid contains a lot of gas.

Affected by the velocity distribution, under the condition of axial symmetry distribution, traffic signal is proportional to the average flow velocity.

So, before and after the electromagnetic flowmeter must also have a certain length of straight pipe before and after.
The influence of electromagnetic interference vulnerable to the outside world.
In the use of the effect is influenced by many factors.

True, reliable, and its accuracy of measurement in addition to related to the converter, more mainly depends on the sensor, the sensor of the excitation technique had a great influence on traffic detection.
What are characteristics of electromagnetic flowmeter: (
1)

Simple structure, no moving parts and hinder the perturbation of the measured medium flow or throttling parts, for easy adhesion and solid-liquid two phase medium such as blockage, abrasion problem.

Can make up for the inadequacy of mass flowmeter is not easy to measure this medium.
(
2)

Electromagnetic flowmeter is a kind of measuring volume flow meter, its measurement is not affected by the density of the fluid, temperature, pressure, viscosity, Reynolds number and the influence of conductivity changes within a certain scope.

Electromagnetic flowmeter only water as a test medium for calibration, without the need for additional amendment can be used to measure other conductive liquid.
This is what other meter does not have advantages.
(
3)

Electromagnetic flowmeter measurement range is very large, some product range up to 1000:1.

On the same caliber sensor, and its full scale as long as the medium velocity in 0.
3 ~ 15 m/s range can be set freely.

Electromagnetic flowmeter measurement range can cover the turbulent and laminar flow of two kinds of velocity distribution state and the differential pressure flow meter, turbine, and vortex street flowmeter can not be compared to.
(
4)

On the measuring principle is linear, high measurement accuracy, and completely electrical signal output, a reflection of measuring speed, measurable pulsating flow and rapid accumulation amount.
(
5)
Good corrosion resistance.
(
6)

In principle is measured average flow velocity distribution in the cross section of the water, the velocity distribution requirements is low.

Therefore, sensor straight pipe before and after the request flow meter shorter than others.
(
7)
Is measurable, the fluid flow in two directions.

Electromagnetic flowmeter excitation method: dc excitation of the last century, European countries have developed with dc excitation electromagnetic flowmeter, and began its industrial application.

Dc excitation technology is the use of permanent magnets or dc power supply for electromagnetic flow sensor field winding of power supply, in order to form a constant excitation magnetic field, as shown in figure 1.

Dc excitation technology zui big problem is dc induction electromotive force in both positive and negative polarity of the electrode is formed on the surface of the fixed, caused by current electrolytic medium body, lead to the electrode surface polarization phenomenon.

In order to eliminate the electrode polarization effect in dc excitation ills, such as in the next few decades, the developed countries and put forward the recruitment frequency sine wave excitation, as shown in figure 2.

Is the use of power frequency 50 hz sine wave power supply for electromagnetic flow sensor field winding power supply.

Its main characteristic is to basically eliminate the surface of the electrode polarization phenomenon, reduce the effects of electrode electrochemical potential and the internal impedance of the transducer.

However, power frequency sine wave excitation technology will bring a series of electromagnetic interference and noise.

Seven of the last century, generations of paper industry in China in eighty in domestic electromagnetic flowmeter, found that the electromagnetic flowmeter often appear unstable zero and values.

Strict grounding and away from electromagnetic interference source cannot be completely solved, influenced the production.
This related to the weakness of power frequency excitation.

Low-frequency rectangular wave excitation: in order to thoroughly solve the problem of electromagnetic flow 'frequency interference, improve the flow measurement precision, between dc excitation and power frequency ac excitation of low-frequency rectangular wave excitation technology was put forward.

The excitation technique, as shown in figure 3, already has a dc excitation technology does not produce eddy current effect, transformer effect (
Orthogonal interference)

Characteristics, but also has basic does not produce polarization effect power frequency sine wave excitation, facilitate the amplified signal processing, and can avoid dc amplifier zero drift, noise, stability, etc, the advantages of and has good anti-jamming performance, are widely used in the electromagnetic flow meter.

Due to the rectangular wave excitation of these advantages, in the eighty s, with the introduction of the excitation technology joint venture products has been widely used.

Dual frequency rectangular wave excitation, the late 1980 s of foreign manufacturers introduced dual-frequency rectangular wave excitation technology.
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Abstract: The information on the measurement principle of the commonly used flowmeter instruments is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Instruments that measure the speed of water flow in water bodies such as rivers, lakes, and channels. There are three types: mechanical, electrical and ultrasonic. The mechanical type is mainly rotor type, and there are propeller type and rotary cup type flow meter. The electrical measuring type has an electromagnetic flowmeter. Ultrasound type time difference and Doppler. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the measurement principle of the commonly used flowmeter instruments. Instruments that measure the speed of water flow in water bodies such as rivers, lakes, and channels. There are three types: mechanical, electrical and ultrasonic. The mechanical type is mainly rotor type, and there are propeller type and rotary cup type flow meter. The electrical measuring type has an electromagnetic flowmeter. Ultrasonic time difference and Doppler flow meter. The flow meter is generally suitable for the average flow velocity during the fixed-point measurement period. The instantaneous flow velocity can be measured by a magnetic flowmeter or a rotor-type flowmeter with multiple signals at one turn, and it can also be used for speed measurement by moving boats. The speed measurement range of the instrument is generally 0.03 to 5.00 m/s, and the applicable water depth is generally 0.2 to 20 meters. In 1790, German R. Walterman made a rotor-type flowmeter for flow measurement. The rotary cup type and propeller type flowmeters manufactured and used in China in the 1950s and 1960s have the characteristics of good waterproof and sandproof performance. The development direction of flow meter is non-rotor electrical measurement technology, optical technology, ultrasonic technology and telemetry technology. (See color picture) The propeller type current meter is mainly composed of three parts: the propeller, the frame and the tail. The propeller is equipped with signal contacts and bearing shafts, etc., China '25-1 type”The rotating shaft system of the propeller flow meter has a tortuous labyrinth structure, which is filled with light oil, which has good waterproof and sand-proof performance, and can be used in high-speed and sandy rivers. The propeller-type flowmeter, the rotary-cup flowmeter and the rotary-vane flowmeter are all rotor-type flowmeters, and the working principle is basically the same. The formula is: whereυis the flow rate; N is the total number of revolutions in the period; t is the duration of the period; c is a constant, reflecting the frictional resistance when the rotor rotates; the K value depends on the blade pitch or cup shape. K and c values ​​are all tested in a special water tank. In the case of low speed, due to the great influence of the c value, the flow velocity formula is a curve function, and the above formula is no longer used. The number of revolutions is displayed by a counter. The simplest counters are small lamps, bells and transistor speakers. Every time the propeller rotates 20 times, the switch is turned on once, the electric light flashes or the sound is counted manually, and the stop watch is used for timing. The more perfect ones include electric counters, electronic counters, timing counters and direct-reading flow rate displays. These counters can be used for A current meter with many signals per rotation of the propeller can improve the speed measurement accuracy. The principle of the electromagnetic flowmeter is to use the water flow as a conductor to cut the magnetic field lines in a certain magnetic field, that is, to generate an electromotive force, and its voltage is proportional to the flow rate. The instrument has no rotor, smooth appearance, small volume and low power consumption. There is an excitation coil in the body cavity, and a pair of electrodes are embedded in the direction perpendicular to the magnetic field line on the surface to communicate with the water body. When the water flows on its surface, a trace voltage signal is generated on the electrode, which is transmitted to the counter with a wire, and the flow rate can be directly displayed after circuit processing such as amplification and analog-to-digital conversion. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Measuring Principles of Commonly Used Velocity Meters'
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Abstract: The reasons for the inaccurate flow of the dual-rotor flowmeter meter and the solution information are provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Since the dual rotor flowmeter is a positive displacement flowmeter, the accuracy can reach 0.5% or even 0.2%. It is more and more widely used in the flow measurement of petrochemical enterprises. But during the metering process we have received some feedback from users that the dual rotor flowmeter is inaccurate or not. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the reasons for the inaccurate flow of the dual-rotor flowmeter meter and the details of the solution. Since the dual rotor flowmeter is a positive displacement flowmeter, the accuracy can reach 0.5% or even 0.2%. It is more and more widely used in the flow measurement of petrochemical enterprises. However, during the measurement process, we received some feedback from users that the dual-rotor flowmeter was inaccurate or simply did not flow. I have summarized these reasons for the flowmeter. First, due to improper selection, the measurement range of the selected flowmeter is lower than or higher than the actual flow range of the site. The solution to the no flow display of the dual rotor flowmeter on site: check whether there is liquid flowing out of the pipe outlet. If it is not stated that there are impurities in the pipeline or oil. Need to add filter and remove impurities. If there is flow out, please disassemble the connection between the meter head and the body to check whether the gear connection is normal. The reason for the inaccurate measurement of the dual rotor flowmeter is mostly because the lower measurement limit of the instrument is not reached. The measuring range of the double rotor flowmeter as ordered is 1-10m³/h, change it to L/min, it is 16.67L/min-166.67L/min. Please check whether the instrument is ready to be tested within the measuring range of the instrument. The flow of the tanker is generally small, and the maximum flow data given by the customer is 1171.67L a day. So it is likely that the flow rate is inaccurate because the flow rate is too low. In addition, the dual rotor flowmeter also needs to clean the filter regularly to avoid clogging. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes and solutions for inaccurate flow of dual rotor flowmeters'
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Evaluating Performance: Micro Motion Flowmeter vs Micro Motion Coriolis Flow Meter

Introduction:

Flow meters are essential devices used in various industries to measure the flow rate of fluids. Accurate flow measurement is crucial for optimizing processes, controlling costs, and ensuring product quality. Micro Motion, a leading manufacturer of flow measurement instruments, offers two popular devices: the Micro Motion Flowmeter and the Micro Motion Coriolis Flow Meter. In this article, we will evaluate the performance of these two flow meters and analyze their benefits and limitations in different applications.

1. Understanding the Micro Motion Flowmeter:

The Micro Motion Flowmeter is a highly accurate device that utilizes the Coriolis effect to measure flow. It is known for its robust construction and ability to handle a wide range of fluid types, including corrosive and high-viscosity liquids. The flowmeter consists of a vibrating tube through which the fluid flows. The fluid's mass flow rate is determined by measuring the changes in the tube's vibration caused by the Coriolis forces.

Advantages of the Micro Motion Flowmeter:

- Superior Accuracy: The Micro Motion Flowmeter offers exceptional accuracy, often exceeding ±0.1% of the measured value. This high level of precision makes it suitable for applications where even minor flow variations can significantly impact the process.

- Versatility: Designed to handle various fluid types, the Micro Motion Flowmeter is a versatile device that can be used in diverse industries such as chemical manufacturing, oil and gas, food and beverage, and pharmaceuticals. Its capability to measure different fluid viscosities and densities makes it an ideal choice for a wide range of applications.

2. Introducing the Micro Motion Coriolis Flow Meter:

The Micro Motion Coriolis Flow Meter is another advanced flow measurement device offered by Micro Motion. It also utilizes the Coriolis effect but employs a different design compared to the Micro Motion Flowmeter. Instead of a vibrating tube, the Coriolis Flow Meter uses one or more curved tubes through which the fluid flows. The fluid's mass flow rate is determined by measuring the phase shift between oscillations induced in the tubes.

Advantages of the Micro Motion Coriolis Flow Meter:

- Reduced Pressure Drop: Compared to the Micro Motion Flowmeter, the Coriolis Flow Meter typically exhibits lower pressure drop. This characteristic is crucial in applications where maintaining a steady flow rate without causing unnecessary resistance is paramount.

- Compact Design: The Micro Motion Coriolis Flow Meter is often appreciated for its compact size, which enables easy installation in tight spaces. It is suitable for applications with limited installation footprint requirements.

3. Performance Evaluation: Accuracy and Linearity:

One of the key parameters to evaluate the performance of flow meters is their accuracy and linearity. Accuracy refers to the closeness of the measured value to the actual value, while linearity describes how well the flow meter maintains accuracy over its entire measurement range.

The Micro Motion Flowmeter and the Micro Motion Coriolis Flow Meter both exhibit excellent accuracy, with deviations typically within ±0.1% of the measured value. However, the Micro Motion Coriolis Flow Meter is often deemed more linear across its entire range compared to the Micro Motion Flowmeter, ensuring consistent accuracy regardless of the flow rate.

4. Application-Specific Considerations:

While both flow meters offer superior accuracy, it is essential to consider specific application requirements when choosing between them.

- High-Viscosity Fluids: The Micro Motion Coriolis Flow Meter has an advantage in measuring high-viscosity fluids due to its curved tube design. It is more resistant to clogging and can maintain accuracy even with the presence of particulates or solids in the fluid.

- Chemical Compatibility: When dealing with corrosive or aggressive fluids, the Micro Motion Flowmeter with its robust construction and wide fluid compatibility may be a better choice. It can withstand harsh chemicals and extreme operating conditions.

5. Cost Considerations and Maintenance:

In any decision-making process, cost considerations play a crucial role. While the initial investment for both flow meters may be similar, the maintenance and calibration requirements can vary.

The Micro Motion Flowmeter typically requires less frequent calibration, thus reducing maintenance costs. On the other hand, the Micro Motion Coriolis Flow Meter might require more frequent calibration due to its design characteristics. However, it is important to evaluate the overall cost of ownership, including installation, maintenance, and possible downtime, to make an informed decision.

Conclusion:

In the realm of flow measurement, the Micro Motion Flowmeter and the Micro Motion Coriolis Flow Meter are both respected instruments that offer high accuracy and performance. Understanding their differences and considering the specific requirements of the application is crucial in selecting the optimal flow meter. While the Micro Motion Flowmeter excels in versatility and accuracy in various fluid types, the Micro Motion Coriolis Flow Meter offers reduced pressure drop and compact design benefits. By carefully evaluating their strengths and weaknesses, industries can make well-informed decisions and optimize their processes for enhanced efficiency and productivity.

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