Abstract: what are the factors influence the measuring accuracy of vortex flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Now we face the most users are using vortex flowmeter measurement of steam flow, today we will give priority to with saturated steam to analysis together with everybody steam of vortex street flowmeter accuracy exactly what factors influence. Problem analysis and solution:. More flow meter manufacturers choose model price quote you are welcome to inquire, here is what are the factors influence the measuring accuracy of vortex flow meter scale article details. Now we face the most users are using vortex flowmeter measurement of steam flow, today we will give priority to with saturated steam to analysis together with everybody steam of vortex street flowmeter accuracy exactly what factors influence. Problem analysis and solution: 1, the steam is dry humidity analysis: in the steam containing water have an effect on accuracy of vortex flowmeter is 'the article we have introduced not contain too much water into steam, steam dryness under 85%. Solution: when steam humidity higher than 85%, in 7 d - meter exports Humidity transmitter 8 d. 2, excessive saturated steam pressure variation analysis: in the industrial field of normal pressure changes in the change in pressure is directly resulted in the density of saturated steam, when the pressure fluctuation value is higher than the rating, will directly affect the flow numerical height; Solution: because the density of saturated vapor pressure and temperature are one-to-one correspondence, so we according to the change of pressure correction of density compensation method based on look-up table segmented correction 3, instrument installation of pipeline vibration analysis: larger installation without reinforcement, pipe when the vibration is larger, results in higher flow value solution: strengthening four triangular, steam pipe exports to atmospheric vortex flowmeter analysis: when flowmeter export to the atmosphere, will appear before and after the pressure difference is too big, easy to achieve flow velocity limit; Solution: need to strictly control the saturated steam velocity makes it less than the maximum velocity of flow meter, or on the sides of vortex flowmeters are 5 rectifier, steam straight pipe before and after the installation of the wrong analysis: when the straight pipe before and after the meter is not in conformity with the requirements, the measuring principle of vortex flowmeters can be concluded that the distance is not in conformity with the requirement to reach vortex formation of the necessary conditions for the solution: straight pipe before and after the steam of vortex flow meter distance must be installed in strict accordance with the requirement to summarize: when the user after the purchase of vortex street flowmeter, during the installation process of Shanghai quality instrumentation engineers strong mind, read the instructions before installation, to avoid the unnecessary factors before and after the installation work above is all there is in this article, you are welcome to inquire me factory flowmeter selection, quotation, etc.
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Abstract: the principle of ultrasonic flowmeter scale acoustic information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Divided into two major categories of electromagnetic and mechanical wave wave according to the nature. Electromagnetic wave is generated due to the effect of electromagnetic force and electromagnetic field changes in space communication process. Electromagnetic wave can be divided by frequency radio waves, infrared rays, visible light, ultraviolet, X-ray, etc. Machine. More flow meter manufacturers choose model price quote you are welcome to inquire, is a principle of ultrasonic flowmeter scale acoustic article details below. Divided into two major categories of electromagnetic and mechanical wave wave according to the nature. Electromagnetic wave is generated due to the effect of electromagnetic force and electromagnetic field changes in space communication process. Electromagnetic wave can be divided by frequency radio waves, infrared rays, visible light, ultraviolet, X-ray, etc. Mechanical wave is due to mechanical force produced by the mechanical wave propagation in the medium, its transmission is mechanical energy, can only be spread in the media. Sound is a mechanical wave, according to the divided into sound, but WenShengBo, ultrasonic frequency. Less than 20 hz frequency wave is sound; In the 20 ~ 20000 hz frequency wave become WenShengBo; In more than 20 KHZ frequency wave called ultrasonic. Ultrasound is a mechanical vibration wave in more than 20 KHZ frequency, its good directivity, energy concentration, penetrating power is big, can penetrate several meters thick steel plate, little energy consumption, to meet the interface of two kinds of medium, can produce obvious phenomenon of reflection and refraction. Ultrasonic wave in the process of communication there is a recession phenomenon, this is because the dielectric absorption of ultrasonic energy. Ultrasonic attenuation in air quickly, especially when high frequency attenuation faster, so in air when using low frequency ultrasound, generally in a few kHz, ( 40 khz) And slower attenuation in liquid and solid, spread far away, so can be used in high frequency, generally a few hundred kHz or higher. Ultrasonic sensor application scope is broad, can be used to measure flow ( Ultrasonic flowmeter) , liquid level measurement ( Ultrasonic level meter) , measuring level ( Ultrasonic level meter) Measuring the thickness of the material and anti-theft alarm. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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Abstract: The information on how to select and install sewage flow meters is provided by excellent flow meter and flow meter manufacturers. Reasonable selection and correct installation of sewage flow meters are very important to ensure measurement accuracy and prolong the service life of the instrument. The following is a brief introduction to the selection principle of sewage flowmeter, installation conditions and precautions for use. (1) Sewage flow meter. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details on how to choose and install sewage flowmeters. Reasonable selection and correct installation of sewage flow meters are very important to ensure measurement accuracy and prolong the service life of the instrument. The following is a brief introduction to the selection principle of sewage flowmeter, installation conditions and precautions for use. (1) Selection principle of sewage flowmeter The selection of sewage flowmeter is mainly the correct selection of transmitter, and the converter only needs to be matched with it. 1. Selection of caliber and range The caliber of the transmitter is usually the same as that of the piping system. If the piping system is to be designed, the diameter can be selected according to the flow range and flow rate. For electromagnetic flowmeters, the flow rate is 2—4m/s is more suitable. In special cases, such as the liquid with solid particles, considering the wear situation, the usual flow rate can be selected≤3m/s, for easy-to-manage fluids. Optional flow rate≥2m/s. After the flow rate is determined, the diameter of the transmitter can be determined according to qv= D2. The range of the transmitter can be selected according to two principles: one is that the full scale of the instrument is greater than the expected maximum flow value; the other is that the normal flow is greater than 50% of the full scale of the instrument to ensure a certain measurement accuracy. 2. Selection of temperature and pressure The fluid pressure and temperature that the sewage flowmeter can measure is limited. When selecting, the operating pressure must be lower than the working pressure specified by the flowmeter. At present, the working pressure specifications of domestic sewage flowmeters are: less than 50mm diameter, working pressure is 1.6MPa, 900mm diameter, working pressure is 1MPa; larger than 1000mm diameter, working pressure is 0.6MPa. If you have special requirements for the pressure resistance of the transmitter, you can negotiate with the manufacturer. Some manufacturers have been able to manufacture electromagnetic flow transmitters with a pressure resistance of 32MPa. The operating temperature of the sewage flowmeter depends on the lining material used, generally 5—70℃. If special treatment is done, it can exceed the above range, and the transmitter allows the temperature of the measured medium to be—40 ten 130 ℃. 3. Selection of lining material and electrode tree material The lining material and electrode material of the transmitter must be correctly selected according to the physical and chemical properties of the medium, otherwise the instrument will be damaged quickly due to the corrosion of the lining and electrode, and the corrosiveness is very strong. Once the medium leaks, it is easy to cause an accident. Therefore, the materials of electrodes and linings must be carefully selected according to the specific measurement medium in the production process. (2) The installation of sewage flowmeter To ensure the measurement accuracy of sewage flowmeter, correct installation is very important. ①The transmitter should be installed in a dry and ventilated place indoors. Avoid installing in places with high ambient temperature, should not be subjected to strong vibration, and try to avoid equipment with strong magnetic fields, such as large motors, transformers, etc. Avoid installing in places with corrosive gas. The installation site is convenient for maintenance. This is the environmental condition to ensure the normal operation of the transmitter. ②In order to ensure that the measuring tube of the transmitter is filled with the measured medium, the transformer should be installed vertically, and the flow direction is from bottom to top. Especially for liquid-solid two-phase flow, it must be installed vertically. If only horizontal installation is allowed on site, it must be ensured that the two electrodes are on the same horizontal plane. ③ Valves and bypasses should be installed at both ends of the transmitter. ④ The AC potential of several millivolts measured by the electrode of the electromagnetic flow transmitter is based on the liquid potential in the transmitter. In order to stabilize the liquid potential and keep the equal potential between the transmitter and the fluid to ensure stable measurement, the transmitter casing and both ends of the metal pipe should be well grounded, and the converter casing should also be grounded. The grounding resistance cannot be greater than 10, and cannot be shared with the grounding wire of other electrical equipment. If it is not possible to ensure good contact between the transmitter housing and the metal pipes, use metal wires to connect them. And then reliable grounding. ⑤ In order to avoid interfering signals, the signal between the transmitter and the converter must be transmitted with shielded wires. It is not allowed to put the signal cable and the power cable in parallel in the same cable steel pipe. The length of the signal cable should generally not exceed 30m. ⑥ The installation site of the converter should avoid strong AC and DC magnetic fields and vibration, and the ambient temperature is—20-50℃, no corrosive gas, relative humidity not more than 80%. ⑦ In order to avoid the influence of the relative measurement of the flow rate, the flow control valve should be set downstream of the transmitter. For small-diameter transmitters, since the distance from the center of the electrode to the inlet end of the flowmeter is equivalent to several times the length of the diameter D, the upstream straight pipe may not be specified. However, for flowmeters with larger diameters, there should generally be a straight pipe section above 5D in the upstream, and generally no straight pipe section is required in the downstream. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'How to select and install sewage flow meter'
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Water Flow Measurement: Coriolis vs. Ultrasonic in Municipal Systems

Introduction

Water flow measurement is a crucial aspect of managing municipal systems. Accurate measurement is required for billing, distribution monitoring, leak detection, and overall system optimization. Traditionally, two popular methods have been employed: Coriolis mass flow meters and ultrasonic flow meters. In this article, we will explore the differences between these two methods and their applications in municipal water systems.

Understanding Water Flow Measurement

Before delving into the specifics, let us first understand the fundamental principles behind water flow measurement. Flow meters are devices that quantify the volume, velocity, or mass of liquid passing through a specific point in a given period. In municipal water systems, accurate measurement ensures efficient allocation of resources and helps identify potential issues or discrepancies.

1. Coriolis Flow Meters: Principles and Applications

Coriolis flow meters operate on the principle of Coriolis effect, which states that a mass moving in a rotating system experiences an additional force due to the system's rotation. In the context of flow measurement, this force is used to determine the mass flow rate of the liquid passing through the meter. Coriolis flow meters are known for their high accuracy and ability to measure both mass flow rate and density simultaneously.

1.1 Advantages of Coriolis Flow Meters

- Excellent accuracy: Coriolis flow meters offer high accuracy even at low flow rates, making them suitable for precise billing and leak detection.

- Wide range of flow rates: These meters can handle a wide range of flow rates, from very low to very high, ensuring versatility in different municipal systems.

- No moving parts in contact with the fluid: Coriolis flow meters have no moving parts that come into contact with the fluid, reducing the risk of contamination and maintenance requirements.

- Density measurement: The ability to measure the density of the fluid provides additional information about its composition and quality.

1.2 Applications of Coriolis Flow Meters in Municipal Systems

- Billing accuracy: Coriolis flow meters enable accurate measurement of water consumption, ensuring fair billing for customers.

- Leakage detection: By precisely measuring low flow rates, these meters can identify even small leaks in the system, leading to timely repairs and reduced water loss.

- Water quality monitoring: The density measurement capability of Coriolis flow meters assists in monitoring changes in water composition, helping detect any abnormality or contamination.

2. Ultrasonic Flow Meters: Principles and Applications

Ultrasonic flow meters utilize sound waves to measure flow velocity by employing either the transit-time or Doppler method. Transit-time ultrasonic flow meters measure the time difference of ultrasonic signals traveling with and against the flow, while Doppler meters measure the frequency shift caused by the velocity of suspended particles or bubbles in the fluid.

2.1 Advantages of Ultrasonic Flow Meters

- Non-intrusive installation: Ultrasonic flow meters can be installed without cutting pipes or interrupting flow, minimizing system downtime and installation costs.

- Wide pipe diameter compatibility: These meters can be used in a wide range of pipe sizes, making them suitable for various municipal systems.

- No pressure drop: Due to their non-intrusive installation, ultrasonic flow meters do not cause pressure drops in the system, ensuring optimal flow characteristics.

- Easy maintenance: With no moving parts, these meters require minimal maintenance and are less prone to mechanical failures.

2.2 Applications of Ultrasonic Flow Meters in Municipal Systems

- Network monitoring: Ultrasonic flow meters enable continuous monitoring of water flow in the distribution network, providing real-time data for system analysis and management.

- Leak detection: By detecting discrepancies between inflow and outflow rates, ultrasonic flow meters can identify potential leaks and trigger appropriate actions.

- Flow profiling: These meters help profile the flow patterns within the pipe network, allowing for optimization of distribution and identifying areas with abnormal flow characteristics.

3. Choosing the Right Method for Municipal Systems

Selecting the most suitable flow measurement method depends on various factors such as system requirements, pipe characteristics, budget constraints, and maintenance preferences. In some cases, a combination of Coriolis and ultrasonic flow meters might offer the best solution. Collaborating with experts and considering the specific needs of the system will guide decision-making for optimal flow measurement.

Conclusion

Accurate water flow measurement is essential for the efficient functioning of municipal systems. Coriolis flow meters excel in accuracy, density measurement, and leak detection, while ultrasonic flow meters offer non-intrusive installation and flow profiling advantages. By understanding the principles and applications of these methods, municipalities can make informed decisions to ensure precise measurements, effective resource allocation, and improved system management.

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Ensuring compliance with ATEX standards in flow meter applications is more than just adhering to regulatory requirements; it's about ensuring safety and reliability in potentially explosive environments. ATEX, derived from the French term 'ATmosphères EXplosibles,' is a key directive in European Union legislation that addresses explosive atmospheres and the equipment used within them. This article delves deeply into the importance of ATEX compliance and how it shapes the selection and application of flow meters in various industries.

Flow meters are integral in various sectors, including oil and gas, chemical processing, pharmaceuticals, and food and beverage. When operating in potentially explosive atmospheres, ensuring these devices conform to stringent safety standards is imperative. This article will explore the critical aspects of ATEX standards and their impact on flow meter applications.

The Importance of ATEX Compliance

ATEX compliance is not merely a bureaucratic hurdle; it represents a fundamental aspect of operational safety. Explosive atmospheres can occur in any environment where flammable gases, vapors, mists, or dust is present. Examples include chemical plants, oil refineries, grain silos, and even areas where combustible powdered substances are handled. These environments pose significant risks, necessitating stringent measures to prevent explosions and mitigate any potential damage.

ATEX directives are divided into two main categories: ATEX 95 (94/9/EC), concerning equipment and protective systems intended for use in potentially explosive atmospheres, and ATEX 137 (99/92/EC), dealing with the health and safety of workers. Flow meters, as equipment frequently employed in hazardous zones, must adhere to these directives. Non-compliance can lead to catastrophic accidents, financial losses, and severe legal repercussions.

Manufacturers and operators must ensure that their flow meters are designed, tested, and certified according to ATEX standards. This involves rigorous risk assessments, proper material selection, appropriate design to prevent sources of ignition, and using failsafe mechanisms. Understanding and implementing ATEX compliance helps avoid accidents and ensures the longevity and efficiency of flow meter applications.

Key Considerations for Flow Meter Selection

Selecting the appropriate flow meter for hazardous areas involves several key considerations. Firstly, the type of flow meter technology must be suited to the specific medium being measured, whether gases, liquids, or particulates. Common types include differential pressure flow meters, positive displacement meters, magnetic flow meters, and ultrasonic flow meters. Each type has its advantages and limitations.

Secondly, understanding the classification of hazardous zones is crucial. ATEX defines three zones based on the likelihood and duration of explosive atmospheres: Zone 0 (continuous presence), Zone 1 (likely presence), and Zone 2 (infrequent presence). Flow meters must be rated appropriately for the designated zone to ensure safety. Equipment intended for Zone 0, for instance, must be intrinsically safe and meet the highest safety standards.

Thirdly, the material selection for constructing flow meters is vital. Materials must be non-reactive with the medium and capable of withstanding harsh environmental conditions. Stainless steel, for example, is often used due to its durability and resistance to corrosion and high temperatures. Additionally, the compatibility of materials with ATEX standards ensures minimal risk of sparking or overheating.

Fourthly, considering the maintenance and calibration needs of flow meters is essential. Regular maintenance and periodic calibration are necessary to ensure ongoing accuracy and safety. Easy access to serviceable parts and non-intrusive calibration methods can minimize downtime and maintain compliance.

By carefully evaluating these factors, operators can select the most suitable flow meters to ensure compliance with ATEX standards, thereby enhancing operational safety and efficiency in hazardous environments.

Risk Assessment and Management

Conducting comprehensive risk assessments is a cornerstone of ensuring ATEX compliance in flow meter applications. A thorough risk assessment identifies potential sources of ignition, the nature of explosive atmospheres, and the likelihood and impact of an explosion. This assessment should cover all operational aspects, from installation and operation to maintenance and decommissioning.

The first step in a risk assessment is to identify hazardous areas within the plant or facility. This involves classifying zones based on the frequency and duration of explosive atmospheres. Detailed documentation of each zone and its specific hazards helps in selecting the right equipment and implementing appropriate safety measures.

Next, the assessment must identify all possible ignition sources. These can include electrical sparks, hot surfaces, static electricity, and mechanical friction. Flow meters must be designed to eliminate or mitigate these ignition sources. Intrinsically safe designs, flameproof enclosures, and non-sparking materials are some of the measures employed to reduce ignition risks.

Additionally, a robust risk management plan should include regular safety audits and inspections. Monitoring and documenting any changes in the operating environment, equipment condition, and safety procedures is critical. This continuous monitoring allows for timely identification of potential risks and the implementation of corrective actions.

Training and educating personnel on ATEX regulations and the specific safety requirements of flow meter applications is another vital aspect of risk management. Ensuring that operators understand the importance of compliance and are well-versed in emergency response procedures enhances overall safety.

By implementing comprehensive risk assessments and robust risk management strategies, operators can ensure that their flow meter applications remain compliant with ATEX standards and operate safely in hazardous environments.

Certification and Testing Procedures

Certification and testing are essential components of ensuring that flow meters meet ATEX standards. The certification process involves a series of rigorous tests and evaluations to verify that the equipment is safe for use in explosive atmospheres. These procedures are conducted by recognized testing bodies and certification agencies.

The certification process begins with an initial review of the design and manufacturing process. This review assesses the materials used, the design's adherence to safety principles, and the manufacturer's quality control procedures. Ensuring that the initial design meets ATEX requirements is crucial before moving to the testing phase.

Testing procedures include both laboratory tests and field tests. Laboratory tests simulate explosive atmospheres and evaluate the flow meter's performance under controlled conditions. These tests assess the equipment's ability to withstand ignition sources, maintain structural integrity, and ensure fail-safe operation. Field tests, on the other hand, involve real-world testing in actual operating environments. These tests provide valuable insights into the flow meter's performance under day-to-day operational conditions.

Once the testing is complete, the results are reviewed, and the flow meter is awarded an ATEX certification if it meets the required standards. The certification label lists the specific zones for which the equipment is approved, ensuring that operators can confidently select the right flow meter for their needs.

Maintaining certification also requires regular re-evaluation and testing, especially when there are changes in the design or manufacturing process. This ongoing process ensures that the flow meters continue to meet ATEX standards throughout their operational life.

By adhering to rigorous certification and testing procedures, manufacturers and operators can ensure that their flow meters are safe for use in hazardous environments, reducing the risk of explosions and ensuring compliance with ATEX regulations.

The Role of Technological Advancements

Technological advancements play a significant role in enhancing the safety and efficiency of flow meters in hazardous areas. Innovations in materials, design, and monitoring technologies contribute to improved compliance with ATEX standards.

One notable advancement is the development of intrinsically safe electronics. These electronics are designed to operate with low energy levels, minimizing the risk of sparks and ignition. This innovation has enabled the deployment of advanced flow meters in the most hazardous environments, including Zone 0 areas.

Another significant technological advancement is the integration of wireless monitoring and control systems. These systems allow operators to remotely monitor flow meter performance, conduct diagnostics, and perform calibrations without physically accessing the equipment. This reduces the risk of human exposure to hazardous environments and enhances overall safety.

Advanced materials, such as corrosion-resistant alloys and composites, have also improved the durability and reliability of flow meters. These materials can withstand harsh chemicals, extreme temperatures, and abrasive particles, ensuring consistent performance and compliance with ATEX standards.

Furthermore, the advent of smart sensors and IoT (Internet of Things) technology has revolutionized flow meter applications. These sensors provide real-time data on flow rates, pressure, and temperature, allowing for predictive maintenance and early detection of potential issues. This proactive approach ensures that flow meters remain in optimal condition and continuously comply with ATEX requirements.

Machine learning and artificial intelligence (AI) also offer significant potential in enhancing the safety and efficiency of flow meters. AI algorithms can analyze vast amounts of data to identify patterns and predict anomalies. This predictive capability helps operators address potential risks before they escalate, ensuring ongoing ATEX compliance.

In summary, technological advancements have significantly contributed to improving the safety, reliability, and efficiency of flow meters in hazardous environments. These innovations support strict compliance with ATEX standards and enhance overall operational safety.

Ensuring compliance with ATEX standards in flow meter applications is a multifaceted endeavor that involves understanding the importance of these standards, careful selection of appropriate equipment, comprehensive risk assessments, rigorous certification and testing, and leveraging technological advancements. By adhering to these principles, operators can ensure the safety and reliability of their flow meter applications in hazardous environments.

In conclusion, ATEX compliance is crucial for mitigating risks and ensuring the safety of operations in explosive atmospheres. The careful selection of flow meters, informed by a thorough risk assessment and rigorous testing, contributes to effective compliance. Technological advancements further enhance this compliance, providing innovative solutions to address the challenges of operating in hazardous environments. Ensuring that flow meters meet ATEX standards safeguards not only the equipment and processes but, more importantly, the lives of those working in potentially dangerous conditions. As technology continues to evolve, so too will the methods and tools available to maintain and enhance compliance, ensuring a safer future for all.

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