Abstract: the electromagnetic flow meter scale commonly used anti-jamming measures information produced by excellent flow meter, flow meter manufacturer to offer you the quotation.

Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction, it produces the original signal is very weak, lack of mv.

If there is a strong electromagnetic field radiation near the flow meter, such as motor, transformer, inverter and other easy to cause electromagnetic interference.

More flow meter manufacturers choose model price quote you are welcome to inquire, here is the commonly used anti-jamming measures the electromagnetic flow meter scale article details.

Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction, it produces the original signal is very weak, lack of mv.

If there is a strong electromagnetic field radiation near the flow meter, such as motor, transformer, inverter some equipment, easy to cause electromagnetic interference will affect the accuracy of the measurement, and even make meter cannot work normally.

So how to signal interference is particularly important.

The following are some of the practical experience accumulated over the years my company, for your reference.

1, elimination of differential interference and power frequency interference, often exist differential interference in the signal and power frequency interference signals, low pass filtering in the signal processing circuit is often difficult to completely filter out the power frequency interference.

The company USES the synchronous sampling and power frequency compensation technology, to suppress potential traffic signal in the mixed with power frequency interference and power frequency power frequency wave power frequency interference, and in addition to the differential interference effectively.

Synchronous sampling technology, sampling start time lag excitation signal 1/4 cycle, it adopts the pulse width of an even number of times the power frequency cycle, eliminate differential interference average potential zhonggong frequency interference at the same time make the traffic signal is equal to zero, in order to eliminate the influence of power frequency interference;

Compensation is to ensure that the frequency of the power frequency power supply fluctuation frequency of the dynamic wave, the excitation power supply and the sampling pulse synchronous adjustment, realize synchronous sampling technology and synchronous excitation technology, synchronous A/D conversion, reduce the influence of differential interference and power frequency interference.

2, zero drift removing: so-called zero drift, is when the input signal of the sensor is zero, the output of the amplifier is not zero.

Zero drift signal will pass between the levels of amplification circuit, after multiple amplification, signal on the output side become larger, as a result of the sensor output signal is weak, zero drift can drown the useful signal and make circuit cannot work normally.

So in order to suppress zero drift and adopts three op-amp input differential circuit, realize the internal resistance of weak signal acquisition, to suppress the introduction of the common mode signal.

Level by blocking capacitor after amplifying circuit, filter the baseline drift, prevent dc signal is too large, is beyond the scope of A/D transformation input.

3, remove the interference of other measures: for by the electromagnetic flowmeter sensor & other;
The transformer effect & throughout;

Produced by the orthogonal interference, using & other;
Transmitter zero method & throughout;
To get rid of.

Software design, the use of digital filtering technology and power-fail protection technology, instruction redundancy, software measures, can effectively improve the reliability of the microprocessor digital input.

Electromagnetic flowmeter maintenance point: electromagnetic flowmeter in use after a period of time, will find measurement data is not accurate.

In fact this is not the quality problem of the electromagnetic flowmeter itself exists.

But because users don't have carried out in accordance with the manual method to the flowmeter in the maintenance and maintenance.

One, zero check and adjustment: intelligent electromagnetic flowmeter in operation before, after electrify electromagnetic flow sensor must be filled with liquid under stationary state zero adjustment.

After put into operation or to use condition periodically stop flow for zero check;

Especially on precipitation, easy pollution electrode, the cleaning liquid containing solid phase, at the beginning of the run should be checked, in order to obtain experience to determine the normal inspection cycle.

Ac excitation mode of electromagnetic flowmeter with rectangular wave excitation, are more likely to produce zero drift, so more attention should be paid to check and adjust.

Second, regularly check the sensor's performance first roughly measure resistance between electrodes.

Disconnect between the converter and signal connection of sensor and sensor inside fluid-filled, to the two electrodes and grounding resistance value is measured with a multimeter, e. range is in the factory, and measured by two values the same.

Record the measured resistance value for the first time, after this value to judge the sensor failure reason (
If sediment is conducting or insulating)
Is useful.

Secondly, sensor emptying liquid, wipe the lining, after being completely dry megohm meter was used to measure the resistance between the two electrodes and earthing terminal.

Above is my company of some of the commonly used method, the hope can help to you, if you have any question no problem, can contact my company, my company will be professional and technical personnel for your answer.

Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Ultrasonic flowmeters have been widely used in industrial production, commercial measurement, and water conservancy testing. In the measurement of raw water, tap water, reclaimed water, and sewage in the municipal industry, ultrasonic flowmeters have the characteristics of large range ratio and no pressure loss. While measuring the readiness, the water delivery efficiency of the water tank is improved. In the flow measurement of water pipelines, channels, pump stations, and power stations in the water conservancy and hydropower industry, ultrasonic flowmeters have the characteristics of large diameter, on-site installation, and online calibration, making accurate measurement possible. At the same time, the purpose of equipment optimization and economical operation is achieved through the measurement of water pumps, single pumps and single machines of water turbines; in the measurement of industrial cooling circulating water, ultrasonic flowmeters have realized online uninterrupted flow and pressure installation and online calibration; in terms of commercial measurement Multi-channel ultrasonic flowmeters have achieved accuracy better than 0.2%. After clarifying the required metering level, preparing to master the technical parameters of the liquid to be tested and the actual conditions of the process pipeline is the key to the correct selection of ultrasonic flowmeters. Next, let's learn how to choose the type. The nature of the measured medium is different, and the selection of flowmeters varies greatly. Requirements such as medium corrosiveness and explosion-proof grade should be considered. Measuring tubes and transducers for measuring corrosive media should be made of stainless steel or other materials that meet the requirements. The temperature of the working condition of the medium specifies the common temperature, the minimum temperature and the maximum temperature of the fluid to be measured, allowing the manufacturer to make selections according to the requirements of the working condition. The working condition pressure of the medium, the common working pressure of the fluid, and the design maximum working pressure. The manufacturer generally selects the type according to the design maximum working pressure to ensure the safety of the flowmeter.
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What should be paid attention to when installing a mass flow meter? The mass flow meter is designed based on the principle of Coriolis force. When the fluid flows through the measuring tube, if the measuring tube vibrates at a certain frequency, the vibrating measuring tube is equivalent to a reference frame rotating at a constant speed. Since the fluid and the measuring tube have relative motion, they will be affected by Coriolis force. So what should be paid attention to when installing a mass flow meter? (1) Installation method. The measurement sensor is installed vertically, so that the suspended solid particles sink, and the air or other gas bubbles float up to ensure the accuracy of crude oil measurement. In addition, the detection tube can be completely emptied to prevent scaling and blockage. (2) Installation place. Install the flowmeter at the lowest part of the rising pipe, so as to avoid gas accumulation in the detection pipe and obtain a certain back pressure at the same time. (3) Avoid no throttling device at the outflow port, and ensure that the measuring device is always full of fluid when it is working. (4) Do not install the sensor near strong electromagnetic objects to prevent the electromagnetic excitation system of the measuring tube from being disturbed. (5) When installing outdoors, pay attention to the highest ambient temperature, and use the weatherproof grille to avoid direct sunlight and rain. (6) If the temperature fluctuates greatly and the environment is humid (external installation), the instrument may produce condensation. In such an environment, to properly install the instrument housing, the cable entry guides must be tightened to ensure a tight seal. Wherever there are severe temperature changes, dry instrument air must be blown over the electronics area.
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Ultrasonic Flow Meter Working Principle, How it works

Ultrasonic flow meters are devices used to measure the flow rate of a liquid or gas by calculating the speed of sound in that liquid or gas. This technology is widely used in various industries such as chemical, oil and gas, water and wastewater, and many others. In this article, we will take a closer look at the working principle of ultrasonic flow meters and how they work.

Understanding Ultrasonic Flow Meters

Ultrasonic flow meters utilize sound waves to determine the velocity of a fluid in order to calculate the flow rate. These flow meters are non-intrusive, which means they do not come into direct contact with the fluid being measured. This is a significant advantage, especially when dealing with corrosive or hazardous fluids.

Ultrasonic flow meters are often used in applications where accuracy, reliability, and low maintenance are essential. They are known for their ability to provide accurate measurements even in demanding operating conditions. These devices are suitable for a wide range of pipe sizes, making them versatile and adaptable to various industrial settings.

The two main types of ultrasonic flow meters are transit-time and Doppler. Transit-time flow meters work by measuring the time it takes for an ultrasonic signal to travel between two transducers. Doppler flow meters, on the other hand, rely on the principle of frequency shift caused by the movement of particles in the fluid.

How Ultrasonic Flow Meters Work

Ultrasonic flow meters operate based on the principle of sound waves. They use ultrasonic transducers to send and receive sound signals through the fluid being measured. By measuring the time it takes for the sound waves to travel upstream and downstream within the pipe, the flow meter can calculate the velocity of the fluid.

The ultrasonic transducers are typically clamped onto the outside of the pipe, eliminating the need for any cutting or welding. This non-invasive installation method makes ultrasonic flow meters the preferred choice in many industries. Once the transducers are in place, they continuously emit ultrasonic signals, and any changes in the fluid velocity have an impact on the time it takes for the signals to travel between the transducers.

To accurately measure flow, ultrasonic flow meters take various factors into account, such as the fluid's temperature, pressure, and the pipe's size and geometry. Many modern ultrasonic flow meters are equipped with advanced signal processing capabilities to compensate for these factors and provide highly accurate flow measurements.

Key Components of Ultrasonic Flow Meters

Ultrasonic flow meters consist of several essential components that work together to measure flow accurately and reliably. The primary components include transducers, signal processors, and a display or control unit.

Transducers: Transducers are the heart of an ultrasonic flow meter. They emit ultrasonic signals into the fluid and receive the reflected signals. These signals are then processed to determine the fluid's velocity and, ultimately, the flow rate.

Signal Processors: Once the transducers receive the reflected signals, the signal processor processes and analyzes the data to calculate the fluid velocity and flow rate. Signal processors in modern ultrasonic flow meters are equipped with advanced algorithms to ensure accurate measurements under varying conditions.

Display/Control Unit: The display or control unit is where the flow rate and other relevant data are presented to the user. This unit can be a standalone device or integrated with other systems depending on the specific application requirements.

In addition to these primary components, ultrasonic flow meters may also include temperature and pressure sensors to compensate for changes in the fluid's properties. Some models also offer advanced features such as data logging, communications interfaces, and remote monitoring capabilities.

Advantages of Ultrasonic Flow Meters

Ultrasonic flow meters offer several advantages over traditional flow measurement technologies, making them a popular choice in many industries.

Non-invasive Installation: Ultrasonic flow meters can be installed without cutting into the pipe, reducing installation time and costs. This non-invasive approach also eliminates the risk of leaks associated with invasive installation methods.

Accurate Measurements: Ultrasonic flow meters provide accurate measurements even in challenging flow conditions, such as low flow rates, high flow velocities, and turbulent flows. They are also unaffected by changes in fluid viscosity, density, and temperature.

Low Maintenance: With no moving parts or obstruction in the flow stream, ultrasonic flow meters require minimal maintenance. This reduces downtime and lowers overall operating costs.

Wide Range of Applications: Ultrasonic flow meters are suitable for a wide variety of fluids, including clean liquids, wastewater, and dirty liquids with suspended solids. They can also be used in large diameter pipes, making them versatile for various industrial applications.

Energy Efficiency: Ultrasonic flow meters have a low-pressure drop, contributing to energy savings in systems where flow measurement is crucial for process control and optimization.

Challenges and Limitations

While ultrasonic flow meters offer numerous advantages, they also have some limitations and challenges that should be considered when selecting a flow measurement solution.

Fluid Properties: Ultrasonic flow meters may not be suitable for some applications involving highly viscous or aerated fluids. The properties of the fluid being measured can impact the accuracy and reliability of the measurements.

Installation Requirements: Proper installation of ultrasonic flow meters is critical for accurate measurements. Factors such as pipe material, wall thickness, and external vibrations can affect the performance of the flow meter.

Cost: Initial investment in ultrasonic flow meters may be higher than some other flow measurement technologies. However, the long-term benefits, such as low maintenance and high accuracy, often outweigh the upfront costs.

Signal Interference: External factors such as air bubbles, sediment buildup, and turbulent flow can interfere with the ultrasonic signals, affecting the meter's performance. Proper installation and regular maintenance can help mitigate these issues.

Conclusion

Ultrasonic flow meters offer a reliable and accurate solution for measuring the flow rate of liquids and gases in various industrial applications. By leveraging ultrasonic technology, these flow meters provide non-invasive, low-maintenance, and highly accurate flow measurements. With their ability to handle a wide range of fluid types and operating conditions, ultrasonic flow meters continue to be a popular choice for industries seeking efficient and reliable flow measurement solutions. As technology advances, the capabilities and performance of ultrasonic flow meters are expected to improve, further solidifying their position as a preferred flow measurement technology. Whether it's monitoring water flow in a municipal system, measuring fuel consumption in a chemical plant, or optimizing fluid processes in a manufacturing facility, ultrasonic flow meters play a crucial role in ensuring efficiency, consistency, and cost-effectiveness.

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Annubar flow meters are commonly used in industrial processes to measure the flow rate of liquids, gases, and steam. These flow meters are known for their accuracy and reliability, but like any technology, they can experience issues from time to time. In this article, we will discuss some common problems that may arise with Annubar flow meters and how to troubleshoot them effectively.

1. Zero Flow Reading

One of the most common issues with Annubar flow meters is a zero flow reading, where the meter shows no flow even when the process is operating. This problem can occur due to several reasons, including improper installation, clogging of the sensor, or air bubbles in the line. To troubleshoot this issue, start by checking the installation of the flow meter to ensure it is done correctly. Make sure the sensor is placed in the flow stream as per the manufacturer's guidelines, and there are no obstructions that could block the flow.

Next, inspect the sensor for any signs of clogging or buildup. If the sensor is dirty, clean it carefully using a soft brush or cloth. It is essential to avoid using harsh chemicals or abrasive materials that could damage the sensor. Additionally, check for the presence of air bubbles in the line, as they can disrupt the flow readings. If air bubbles are detected, try purging the line to remove them and recalibrate the flow meter if necessary.

2. Inaccurate Readings

Another common issue with Annubar flow meters is inaccurate readings, where the meter shows values that do not reflect the actual flow rate. This problem can be caused by a variety of factors, such as sensor drift, calibration errors, or changes in the process conditions. To troubleshoot inaccurate readings, start by checking the calibration of the flow meter. Verify if the meter is calibrated correctly and if any adjustments are needed to align the readings with the actual flow rate.

If the calibration is correct, consider the possibility of sensor drift due to factors like temperature variations or buildup on the sensor. Inspect the sensor for any signs of drift or contamination and clean or recalibrate it as needed. Additionally, check if there have been any changes in the process conditions that could affect the flow readings. Adjust the meter settings accordingly to account for these changes and ensure accurate measurements.

3. Pressure Drop

Pressure drop is another common issue that users may encounter with Annubar flow meters. A significant pressure drop across the flow meter can indicate blockages, restrictions, or damage to the device, affecting its performance. To troubleshoot pressure drop issues, start by checking the condition of the flow meter and the surrounding piping. Look for any signs of blockages, such as debris, scale, or buildup, that could impede the flow of the process fluid.

If no blockages are found, check the pressure taps on the flow meter to ensure they are clean and properly connected. Pressure taps are essential for accurate pressure readings and flow calculations, so it is crucial to maintain them in good condition. Additionally, inspect the condition of the piping and valves in the system to identify any potential causes of pressure drop. Make any necessary repairs or adjustments to restore optimal flow conditions and prevent further issues.

4. Signal Interference

Signal interference is another common issue that can affect the performance of Annubar flow meters. External factors, such as electromagnetic interference or radio frequency interference, can disrupt the signal output of the flow meter, leading to inaccurate readings or loss of communication. To troubleshoot signal interference problems, start by identifying potential sources of interference in the vicinity of the flow meter.

Check for any electronic devices, power cables, or wireless networks that could be causing interference with the flow meter signal. Try to relocate or shield the flow meter from these sources of interference to improve signal stability. Additionally, ensure that the flow meter is grounded properly to minimize the impact of external noise on the signal quality. If the issue persists, consider contacting the manufacturer for guidance on dealing with signal interference and optimizing the flow meter performance.

5. Temperature Inconsistencies

Temperature inconsistencies can also pose a challenge for Annubar flow meters, as fluctuations in temperature can impact the accuracy of flow measurements. Changes in temperature can affect the density and viscosity of the process fluid, leading to variations in flow readings over time. To troubleshoot temperature inconsistencies, start by monitoring the temperature conditions in the process environment and their impact on the flow meter performance.

If temperature variations are causing issues with the flow meter, consider installing temperature compensation features or adjusting the meter settings to account for these changes. Implementing temperature compensation algorithms can help correct for temperature effects on flow readings and improve the overall accuracy of the measurements. Additionally, ensure that the flow meter is installed in a stable temperature environment to minimize the impact of fluctuations on its performance.

In conclusion, troubleshooting common issues with Annubar flow meters requires a systematic approach to identify the root cause of the problem and implement effective solutions. By following the guidelines provided in this article, users can address zero flow readings, inaccurate measurements, pressure drop, signal interference, and temperature inconsistencies to ensure the optimal performance of their flow meters. Remember to consult the manufacturer's documentation and seek professional assistance if needed to resolve complex issues and maintain the reliability of Annubar flow meters in industrial applications.