Abstract: The application analysis information of target flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. Petroleum Anti-condensation blockage - application of high viscosity fluid target flowmeter Crude oil is characterized by a lot of sediment, high viscosity and low Reynolds number. The target flowmeter has superior measurement performance for crude oil: first, no filter is needed, and the flowmeter itself can pass through impurities. Then on the Reynolds number. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the application analysis article of target flowmeters. Crude oil is characterized by a lot of sediment, high viscosity and low Reynolds number. The target flowmeter has superior measurement performance for crude oil: first, no filter is needed, and the flowmeter itself can pass through impurities. Then it is not sensitive to the Reynolds number, and it can basically be measured as long as the fluid has flow. In addition, the integrated structure design makes the installation simple, the sensor and the housing can be quickly separated, and no moving parts are almost maintenance-free. This is the real reason why more and more field personnel are gradually adopting target flow meters. For intermittent working conditions and when the medium is easy to condense and block at low temperature, a target flowmeter with an insulating interlayer can be used to eliminate the solidification and crystallization of the medium in the pipeline or the process heat preservation. Chemical anti-corrosion - acid and alkali resistant target flowmeters are used in the most harsh and complex chemical places to measure liquids and gases with corrosive media such as acid and alkali. Polytetrafluoroethylene lined anti-corrosion- The acid and alkali resistant target flowmeter has been widely praised by customers for its stable measurement performance after years of on-site use. Metallurgical maintenance-free high-precision-measurement of the application of gas target flowmeter Gas such as coke oven gas, water gas, blast furnace gas, etc. contain impurities such as tar, naphthalene, ammonia, sulfide and cyanide, and the viscous properties make flow measurement difficult . Target flowmeters use capacitive force sensors to measure the flow rate of gas, which is an innovation in itself and makes gas measurement very easy. The viscous and perishable medium sticks to the sensor and does not affect the flow measurement performance. Electricity Anti-vibration - Application of Air Volume Target Flowmeter Primary air volume, secondary air volume detection In most cases, the straight pipe section is short, the fluid contains a lot of dust, and the vibration is large. The plug-in target flowmeter has strong anti-impurity and anti-interference functions, and can work normally under strong vibration conditions. You no longer have to worry about the difficulty of selection. Food and medical and health type - the integrated design of the target flowmeter, inductive measurement, plus the sensor does not come into contact with the medium. Whether it is high temperature or low temperature, high viscosity or low viscosity, with impurities and with corrosion, the target flowmeter can fully meet the requirements of hygienic conditions. The application prospect of target flowmeter With its unique characteristics, target flowmeter is suitable for high viscosity occasions, and it is believed that its market share will become larger and larger! The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application Analysis of Target Flow Meter'
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Abstract: Information on the structure and measurement principle of water meters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1 battery-powered ultrasonic water meter features and measurement principles and installation requirements Wear, with measurement accuracy. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the water meter structure and measurement principle. 1 Battery-powered ultrasonic water meter features and measurement principles and installation requirements Wear, it has the characteristics that the measurement accuracy does not change for a long time, and the operation is stable and reliable. The user does not need to set parameters, and can be installed at any angle. The standard single-cell battery can work continuously for 6 years, and the optional battery can work continuously for more than 10 years. The empty pipe state automatically enters the power saving mode, and the full pipe state automatically enters the normal measurement mode. Water meter structure and measurement principle The measurement principle of the battery-powered ultrasonic water meter is to use an ultrasonic transducer to generate ultrasonic waves and make them propagate in the water. The sound waves propagate in the water, and the propagation speed increases in the downstream direction and decreases in the countercurrent direction. The same propagation distance has Different propagation times, when ultrasonic waves propagate in flowing water, produce a propagation velocity difference, which is proportional to the water velocity. The water meter is composed of transducers, electronic circuits, flow display, accumulation and other systems. The ultrasonic transmitting transducer converts electrical energy into ultrasonic energy and transmits it into the fluid to be measured. The ultrasonic signal received by the receiver is transmitted through the electronic circuit. It is amplified and converted into an electrical signal representing the flow for display and integration, and the flow measurement is realized. Ultrasonic flowmeter 1.3 Water meter installation and application precautions w5 ~ When installing an ultrasonic water meter, select a part with a uniform distribution of fluid flow field to ensure that there is enough length of straight pipe section, so that the fluid can form a stable velocity distribution. Generally, the length of the front straight pipe section is 10 times the pipe diameter, and the length of the rear straight pipe section is 5 times the pipe diameter. In addition, keep away from the pump and valve as much as possible. If there is an organic pump, the length of the front straight pipe section generally requires 50 times the pipe diameter. If there is a flow control valve, the length of the front straight pipe section generally requires 30 times the pipe diameter. If the length of the straight pipe section does not meet the requirements , the measurement accuracy will decrease. a) Pipe parameters. When installing an ultrasonic water meter on an old pipeline, it is necessary to accurately obtain the parameters of the pipeline, such as the outer diameter of the pipeline, wall thickness, etc., in order to obtain accurate measurement results. b) Installation method. Because the bubbles and impurities in the pipeline will reflect and attenuate the ultrasonic signal, which will bring great errors to the measurement, so the correct installation method must be selected during installation. When the ultrasonic water meter is installed on inclined and horizontal pipelines, it should be installed horizontally, so that air bubbles can gather above the pipeline, and large impurities will flow along the bottom of the pipeline. Inside. In addition, the installation part of the ultrasonic water meter must have a certain back pressure to ensure that the pipeline is filled with fluid, and there are no air bubbles or few air bubbles to ensure the measurement accuracy. Signal strength and signal goodness checks. The signal strength indicates the signal strength of the upstream and downstream probes, and the signal goodness indicates the signal peaks in the upper and lower transmission directions, which can assist in judging the quality of the received signal. ) check of transit time and transit time difference. The transit time represents the average transit time of the ultrasonic waves, and the transit time difference represents the difference between the upstream and downstream transit times of the ultrasonic waves. These two signals are the main basis for the ultrasonic water meter to calculate the flow rate, especially the transmission time difference can best reflect whether the operation of the ultrasonic water meter is stable. If these two signals are unstable, check whether the sensor probe installation point is suitable and whether the setting data is correct. e) Application Notes. Improper installation is the main reason why the ultrasonic water meter cannot work properly. The location needs to be considered during installation. In addition to ensuring sufficient upstream and downstream straight pipe sections, special attention should be paid to the transducers as far as possible to avoid the occasions where there are frequency converters, pumps and other polluting power sources. Timely verification is the premise to ensure accurate ultrasonic measurement: adhere to one installation and one verification, that is, to verify each newly installed ultrasonic water meter during commissioning to ensure that the location is selected, installed well, and the measurement is accurate; When the flow changes suddenly, use the portable ultrasonic flowmeter to check in time to find out the reason for the sudden change of flow, and determine whether the ultrasonic water meter is faulty or the flow has changed. Regular maintenance is the basic work to ensure the long-term operation of ultrasonic. Compared with other flow meters, the maintenance of ultrasonic water meters is relatively small. Regularly check whether the flange connection between the flowmeter and the pipeline is good, and consider the site temperature and humidity. The influence of components, etc., ensures the long-term stable operation of the ultrasonic water meter.
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Abstract: Several common factors affecting orifice flowmeters and methods to improve accuracy are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Advantages of standard orifice flowmeter: 1. Standard orifice flowmeter belongs to a type of standard throttling parts, which is universal throughout the country and has been recognized by the International Standards Organization. It can be put into use without actual flow calibration. 2. Standard orifice flow. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are some common factors affecting orifice flowmeters and methods to improve accuracy. The article details. Advantages of standard orifice flowmeter: 1. Standard orifice flowmeter belongs to a type of standard throttling parts, which is universal throughout the country and has been recognized by the International Standards Organization. It can be put into use without actual flow calibration. 2. The structure of the standard orifice flowmeter is easy to copy, simple, firm, stable and reliable in performance and low in price; 3. The standard orifice flowmeter has a wide range of applications, including all single-phase fluids (liquid, gas, steam) , Part of the miscible flow, the pipe diameter and working state (temperature, pressure) of the general production process can be measured; 4. The detection piece and the differential pressure display instrument can be produced separately by different manufacturers, so that it can be produced on a specialized scale. 2. Disadvantages 1. The repeatability and accuracy of measurement are at a medium level in flow sensors. Due to the intricate influence of many factors, the accuracy is difficult to improve; 2. The range is narrow. Since the flow coefficient is related to the Reynolds number, the general range is only 3:1 to 4:1; 3. There is a long straight pipe length requirement, which is generally difficult to meet. Especially for larger pipe diameters, the problem is more prominent; 4. The pressure loss is large; 5. The orifice plate has an inner hole with an acute angle to ensure the accuracy, so the sensor is sensitive to corrosion, wear, scaling, and dirt, and it is difficult to ensure long-term accuracy. Dismantle and check once a year; 6. Flange connection is used, which is prone to problems of running, dripping, dripping and leaking, which greatly increases the maintenance workload. When using an orifice flowmeter, the technical requirements for orifice processing are very strict, and must comply with the provisions of national standards or ministerial standards, otherwise, it will bring errors to the measurement results of natural gas flow. (1) Protrusions in the throttling device: Gaskets, welds, etc. that extend into the pipe in the throttling device will also cause certain errors in the flow measurement. The size of the error is related to the position of the protrusion, the distance between the orifice and the protrusion, and Prominent height is related. Tests have shown that whenβ= 0.7, when the protruding object is located at 2 times the pipe diameter upstream of the orifice plate, the error is the largest; if the protruding object is located at the upstream orifice plate, the error is 16% to 50%, if the protruding object is located downstream of the orifice plate, The impact on measurement accuracy is smaller. (2) Bending of the orifice plate: Due to improper installation or maintenance, the orifice plate is bent or deformed, resulting in a large flow measurement error. The test results are carried out on the orifice plate with flange pressure, and the maximum error caused by the bending of the orifice plate is about 3.5%. (3) Orifice plate eccentricity: Experiments show that the measurement error caused by the orifice plate eccentricity is generally within 2%, and the aperture ratioβThe higher the value, the greater the influence of eccentricity, so it should be avoided.βhigh value orifice plate. (4) The front and rear straight pipe sections must meet the length requirements, that is, the distance between the first ten and the fifth, and must meet the on-site installation requirements, otherwise the measurement results of the flowmeter will also bring great errors. Ways to improve the measurement accuracy of the orifice flowmeter (1) Pipeline requirements: The national standards have strict technical requirements for the length, straight pipe, roundness and inner surface roughness of the metering tube. When the minimum length of the metering tube cannot meet the standard requirements, it will bring deviations to the flow measurement results.βIt is related to the Reynolds number, so the rectifier must be installed on the straight pipe in front of the orifice plate to ensure the measurement accuracy. (2) Installation requirements: The inlet end face of the orifice plate must be perpendicular to the axis of the pipeline, and the deviation cannot exceed 1 degree. When installing the orifice plate, pay attention to the direction of the pipeline, and it is strictly forbidden to install it in reverse. It must meet the requirements of the standard for different axial tolerances. The thickness of the gasket between the flange, the orifice plate and the pressure-taking device shall not be greater than 0.03D. The installation of the gasket shall not protrude into the straight pipe section or the inner cavity of the pressure-taking device, and shall not block the pressure-taking port and cause the change of the pressure-taking position. The orifice plate must be installed on the throttling device after the pipeline has been purged and operated for a few days to prevent the orifice plate from being damaged or polluted by liquid and solid impurities in the gas. To correctly select and use the differential pressure gauge, the differential pressure measurement process is too large and the flow rate is small. The differential pressure gauge works below 30%, which will greatly reduce the flow measurement accuracy. When the measurement flow decreases, the differential pressure gauge should be replaced in time. The size of the spring or orifice plate specifications, otherwise, the differential pressure error will be multiplied. The fundamental reason that affects the measurement accuracy of the orifice flowmeter is whether the geometry and flow state of the throttling device deviate from the design standards. Therefore, in actual use, the throttling device, orifice plate, and double corrugated differential pressure gauge should be checked and adjusted regularly in strict accordance with the design requirements, so as to reduce the measurement error and ensure the measurement accuracy. Nanjing Jinnuo Meter is a flowmeter manufacturer specializing in the production of standard orifice flowmeter series, nozzle flowmeter series; Venturi tube flowmeter series, v-cone series, and cross-section series. Welcome friends from all over the country to come and visit. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Several Common Factors Affecting Orifice Flow Meters and Methods to Improve Accuracy'
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1. Diverter The diverter mainly includes annular channel, tubular channel, grooved channel and mesh channel diverter. The function of the flow divider is to supply only a certain range of gas to the sensor regardless of the flow rate of the flowmeter. If the amount of gas supplied to the sensor is too small, the signal output of the sensor will be too weak. Although it can be amplified, the noise will also be amplified at the same time, making the flowmeter unable to work. If the air volume to the sensor is too large, the sensor will work in the nonlinear region, and the output of the sensor may exceed its limit, and its work will be in an unstable state. Therefore, the calculation and determination of the number of shunt apertures is crucial. Figure 1 Different shapes of flow splitters 2. Application of flow splitter technology in mass flow controllers Gas Q enters the flow splitter channel of the mass flow controller from the gas inlet. Directly through the flow divider Q2; the other way through the capillary Q1 of the flow sensor, and then the two ways merge and flow out from the outlet. The flow sensor of the mass flow controller measures the gas flow through the capillary, and the obtained flow signal is sent to the amplifier for amplification. Fig. 2 Working principle diagram of flow splitter Fig. 3 Schematic diagram of tube type flow splitter When the gas Q gradually increases from zero, the output signal of the sensor also gradually increases from zero, so that there is a gas flow value corresponding to an output Signal value, so that the relationship diagram between the output signal value and the flow rate can be made, as shown in Figure 4. Figure 4. The design of the flow splitter must not only ensure that it provides an appropriate flow rate for the sensor, but also requires that the gas volume it provides is linear, that is, for a flow splitter with a certain flow range, the split ratio should not change with the flow rate. 3. Advantages of using flow splitter In practical application, the flow sensor remains unchanged, and gas mass flow controllers with various flow specifications can be realized by changing the flow splitter. Flow specifications range from 5 ml/min to 30L/min, and each flow specification has a flow divider corresponding to it. Since the inner diameter and length of the capillary of the flow sensor are known, as long as the length L and inner diameter d of the shunt pipe are determined, the number of shunt pipes required can be calculated. Using such an accurate calculation method, the calculation result of the shunt is obtained, which provides a theoretical basis and guarantee for improving the accuracy of the product. At the same time, the use of a flow splitter in the pipeline can ensure that the gas in the mass flow controller is in a laminar flow state, and provide a stable gas environment for the measurement of the gas in the capillary of the sensor, thereby improving the measurement and control accuracy of the product.
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