flow meter, also called the rotor flow meter, is a kind of variable area flowmeter, under a main scale upward vertical cone tube, the circular cross section of float is under the liquid force of gravity, which can float freely in the cone tube rises and falls.

Flow meter is widely used on the following differential pressure flowmeter type flowmeter, suitable for small flow monitoring.
Main advantages:
1)
Simple structure, easy to use;
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2)
Suitable for small diameter and low flow velocity;
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3)
The pressure loss is low.
Disadvantages: low pressure resistance, a glass tube is fragile.


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Abstract: Small signal removal of flow meters The information on the actual operation plan on site is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. What is small signal ablation? What Causes Small Signal Resection? What is the effect of small signal cutoff on metrology data? What is the method of small signal removal? Signals such as flow (such as differential pressure signals) often produce a series of very small values ​​corresponding to actual values. For more flow meter manufacturers to select models and price quotations, you are welcome to inquire. What is small signal ablation? What Causes Small Signal Resection? What is the effect of small signal cutoff on metrology data? What is the method of small signal removal? Signals such as flow (such as differential pressure signal) often correspond to actual values ​​and will generate a series of very small values ​​(this is often due to interference or false signals caused by sensors and transmitters with high accuracy). Only by removing this part of the signal can we get more meaningful value. This part of the work of removing the signal is called small signal removal. What Causes Small Signal Resection? Take the differential pressure flowmeter as an example; in the actual situation of our on-site measurement, the energy medium users of large production units can basically meet the requirements of the standard whether it is instantaneous value or cumulative flow; Range (10%-90%), the actual operating range of the differential pressure is within 10% of the differential pressure range of the instrument, although there has been a small signal cut (usually 0.2%) in data processing, it will still cause flow measurement. greater impact. When the differential pressure is running at the bottom limit, the theoretical error between the error and the flow measurement can reach 100%. Since the flow rate is relatively small when the differential pressure is running at the bottom limit, it may have little effect on the total amount of the whole day, but if it is at the bottom limit for a long time In the case of operation, it has a great impact on the accuracy of measurement and the validity of energy medium data. For example, in a steelmaking unit (4 converters), oxygen blowing in steelmaking is not a continuous process, generally lasting 15 minutes. In the time period when oxygen is not used, the influence of small signals on the flow is huge. The oxygen consumption of steelmaking is basically about 20,000m3/h, and about 30% of the time per hour is in the small signal state. The flow deviation can reach about 9%, and the actual deviation is basically close to 1% after running all day. Although it can meet the requirements of three-level metering, in order to more accurately calculate the energy consumption and the statistical balance of related data, the small signal is removed. Still very necessary. According to on-site maintenance experience and experiments, the main reasons for the small signal are as follows: 1) The differential pressure transmitter is inaccurate during calibration. When the calibration personnel adjust the differential pressure transmitter, they only adjust the output signal to If the accuracy of the differential pressure transmitter is within the required range, without understanding the actual situation of the on-site differential pressure, it may cause the output of the transmitter to increase or decrease; 2) The differential pressure transmitter may have zero drift during use. . The zero point output of the differential pressure transmitter will change with time, it may drift positively, or it may drift negatively from time to time, but from the actual situation on site, the positive drift is still the majority; 3) The signal goes through a series of transmissions After the path is converted into a digital signal through the conversion unit, distortion may be caused. When the differential pressure transmitter transmits an analog signal, the PLC processes a digital signal, and certain errors may occur during the conversion process. There is no differential pressure signal in the throttling device, but a non-zero signal displayed by the computer is a small signal; 4) In the process of material belt transportation in winter, the material will often adhere to the belt, resulting in repeated measurement of the belt scale. Although this part does not belong to the category of the flow throttling device discussed above, it is also a small signal to the measurement data. Influence; how to cut out small signal? Small signals cannot be blindly removed, and must be treated differently according to the actual situation of the on-site process and the different energy media that need to be measured. If they are all handled uniformly, it is not very rigorous. For example, the metering system of a certain steel is mainly divided into two types, one is the 893 system in the late 1990s, which is mainly distributed in the old area of ​​a certain steel, and the other is the currently used metering ring network with PLC system. Both systems can cut off small signals in the flow calculation formula of the host computer. Because when there is no differential pressure signal, the flow measurement system will display the small signal value, as long as the signal is set as a parameter, it can be subtracted when the flow is calculated.
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Abstract: How to ensure the accurate information of the natural gas metering system is provided by the excellent flowmeter and flowmeter production and quotation manufacturers. As an efficient and clean fuel and high-quality chemical raw material, natural gas is increasingly used in the production of enterprises and the life of residents. How to ensure the accuracy of the natural gas metering system and ensure the long-term normal operation of the flowmeter has become more and more concerned. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of how to ensure the accuracy of natural gas metering systems. As an efficient and clean fuel and high-quality chemical raw material, natural gas is increasingly used in the production of enterprises and the life of residents. How to ensure the accuracy of the natural gas metering system and ensure the long-term normal operation of the flowmeter has become the focus of attention. So what should be paid attention to during installation, use and maintenance? 1. Before installing the flowmeter, the process pipeline should be cleaned; 2. The flow direction of the fluid must be in the same direction as the arrow on the housing of the flowmeter. Rain shower measures; 3. The inner diameter of the front and rear pipes connected to the flowmeter should be consistent with the diameter of the flowmeter, and there should be no protrusions (such as protruding welds and gaskets) at the connection between the pipe and the flowmeter. Note that the axis of the pipeline and the axis of the flowmeter are kept concentric; 4. A filter should be installed before the flowmeter to eliminate the influence of impurities. 5. Before the turbine flowmeter is put into operation, it is necessary to set the meter coefficient, check carefully, and confirm that the flowmeter is correctly wired and well grounded before powering on; 6. Regularly clean, check and recalibrate the flowmeter, and there is lubricating oil. Or the flowmeter of the cleaning liquid injection port should be regularly injected with lubricating oil or cleaning liquid according to the requirements of the manual to maintain the good operation of the impeller; 7. Monitor the status of the display instrument, evaluate the display instrument reading, and check in time if there is any abnormality; 8. Keep The filter is unblocked, and the clogging of the filter can be judged from the increase in the reading difference of the pressure gauge at the inlet and outlet, and the clogging should be eliminated in time; 9. For the flow meter for trade settlement, in order to ensure the accuracy of natural gas measurement, it must be regularly Check it out. 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 Ensure the Accuracy of Natural Gas Metering System'
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The mass flow meter is a new type of instrument that directly measures the mass flow of fluid in a closed pipeline. Its structure generally consists of two parts: a signal measurement sensor and a signal converter. Because the mass flowmeter has the characteristics of being able to directly measure the mass flow of fluid beads, high measurement accuracy, wide application range, low installation requirements, reliable instrument operation, and low maintenance rate, mass flowmeters have been widely used in petroleum, chemical, metallurgy, thermal power, etc. , Flow measurement in fields such as electricity and food. The mass flowmeter adopts heat-sensitive measurement, and the flow rate is measured by the molecular mass taken away by the split molecules. Because the heat-sensitive measurement is used, the measurement results will not be affected by changes in gas temperature and pressure. The mass flow meter is a relatively accurate, fast, reliable, efficient, stable and flexible flow measurement instrument. It will be widely used in petroleum processing, chemical industry and other fields, and it is believed that it will show great potential in promoting flow measurement. The mass flowmeter cannot control the flow. The mass flowmeter can only detect the mass flow of liquid or gas, and output the flow value through analog voltage, current or serial communication. However, the mass flow meter is an instrument that can detect and control at the same time. In addition to the measuring part, the mass flowmeter itself also has an electromagnetic regulating valve or a piezoelectric valve. In this way, the mass flowmeter itself constitutes a closed-loop system for controlling the mass flow of fluid. The setting value of the mass flowmeter can be provided by analog voltage, analog current, or computer, PLC. The mass flow meter can also be used as a high-precision online density meter to measure the real-time density and temperature of the fluid. At the same time, other parameters such as volume flow, medium content, concentration, etc. can be calculated accordingly. The mass flowmeter directly measures the mass flow of the medium passing through the flowmeter, and can also measure the density of the medium and indirectly measure the temperature of the medium. Since the transmitter is an intelligent instrument with a single-chip microcomputer as the core, it can derive more than a dozen parameters for users to use according to the above three basic quantities. The mass flow meter is flexible in configuration, powerful in function, and high in performance and price ratio. It is a new generation of flow meter.
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An In-Depth Guide to Ultrasonic Gas Flow Meters

Introduction:

In today's fast-paced world, accurate measurement of gas flow is crucial for numerous industries ranging from chemical plants to oil refineries. Ultrasonic gas flow meters have emerged as a reliable technology for measuring the flow rates of various gases. This comprehensive guide will delve into the working mechanism, benefits, applications, and maintenance of ultrasonic gas flow meters. By the end of this article, you will have a clear understanding of these meters and their indispensable role in the industry.

Working Mechanism of Ultrasonic Gas Flow Meters:

Ultrasonic gas flow meters operate on the principle of utilizing ultrasonic waves to measure the gas flow. They consist of transducers that emit ultrasonic signals, which are directed against the flow direction of the gas. These signals are then reflected off the entrained particles or bubbles within the gas flow. The time it takes for the waves to travel from one transducer to another is measured, allowing for accurate calculation of the gas flow velocity.

Benefits of Ultrasonic Gas Flow Meters:

1. Non-Intrusive: One of the major advantages of ultrasonic gas flow meters is their non-intrusive nature. Unlike traditional flow meters that require cutting the pipe or disrupting the flow, ultrasonic meters can be easily mounted onto the exterior of the pipe. This feature significantly reduces downtime and maintenance costs.

2. High Accuracy: The use of ultrasonic waves ensures high accuracy in gas flow measurement. These meters deliver precise readings even for turbulent and pulsating flows, maintaining accuracy in varying process conditions.

3. Wide Range of Applications: Ultrasonic gas flow meters are versatile and suitable for measuring a wide range of gases, including natural gas, air, steam, different hydrocarbons, and more. This adaptability makes them valuable for various industries, from energy production to petrochemicals.

4. Low Pressure Drop: As ultrasonic gas flow meters do not obstruct the flow path, they create a negligible pressure drop. This characteristic makes them ideal for applications where maintaining the system's integrity is crucial.

5. Minimal Maintenance: With no moving parts, ultrasonic gas flow meters require minimal maintenance. This translates into reduced downtime and associated costs, providing ongoing reliability for the industrial processes.

Applications of Ultrasonic Gas Flow Meters:

1. Oil and Gas Industry: Ultrasonic gas flow meters are extensively used in the oil and gas industry for measuring the flow rates of natural gas, crude oil, and refined products. These meters help optimize production processes and ensure accurate custody transfer measurements.

2. Chemical Plants: Chemical plants often require precise gas flow measurements for various production processes. Ultrasonic gas flow meters offer reliable and accurate readings, enabling better control and optimization of chemical reactions.

3. Power Generation: Ultrasonic gas flow meters are essential for monitoring and optimizing the flow rates of flue gas in power plants. They help in determining the efficiency of combustion processes, ensuring compliance with environmental regulations, and improving overall plant performance.

4. HVAC Systems: Heating, ventilation, and air conditioning (HVAC) systems rely on proper gas flow measurements to maintain comfortable indoor environments. Ultrasonic gas flow meters help HVAC systems operate efficiently by providing accurate readings for air and gas flows.

5. Automotive Industry: Ultrasonic gas flow meters are now being utilized in the automotive industry for applications like vehicle emission testing. These meters aid in measuring the exhaust gas flow accurately, ensuring compliance with emissions standards.

Maintenance of Ultrasonic Gas Flow Meters:

To ensure accurate and reliable gas flow measurements, regular maintenance of ultrasonic gas flow meters is essential. Here are some key maintenance practices:

1. Cleaning: Ultrasonic transducers can accumulate dirt or residue over time, affecting their performance. Regular cleaning of transducers is necessary to maintain accuracy. Follow the manufacturer's guidelines for proper cleaning procedures.

2. Calibration: Periodic calibration is crucial to verify the accuracy of ultrasonic gas flow meters. This ensures that measurements remain within acceptable tolerances. Calibration should be performed by a qualified professional using traceable standards.

3. Inspection: Regular visual inspections of the meter's components, such as the transducers and cabling, are important to identify any signs of damage or wear. Prompt repairs or replacements should be carried out to prevent measurement inaccuracies.

4. Firmware Updates: Ultrasonic gas flow meters may require firmware updates over time. Stay informed about the latest firmware releases from the manufacturer and update the meter accordingly to benefit from any performance enhancements or bug fixes.

Conclusion:

Ultrasonic gas flow meters play a vital role in many industries by providing accurate and reliable gas flow measurements. Their non-intrusive nature, high accuracy, and wide range of applications make them indispensable in optimizing processes and ensuring compliance. By following proper maintenance procedures, these meters can continue to deliver precise measurements, contributing to efficient and sustainable industrial operations.

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