The precession vortex flowmeter supplier installs the flowmeter installation manufacturer's advantages 3. The precession vortex flowmeter adopts a new type of signal processing amplifier and unique filtering technology, which effectively eliminates the interference signal caused by pressure fluctuation and pipeline vibration; 4. It has the function of time display and real-time data storage, regardless of whether In any case, it can ensure that the internal data will not be lost and can be saved; 5. The power consumption of the whole machine is extremely low, and it can run on the internal battery for a long time. It is a local display instrument without external power supply; 6. The anti-theft function is reliable, It has password protection to prevent parameter changes; 7. The head of the precession vortex flowmeter can be rotated 180 degrees at will, which is easy to install.
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Abstract: Vortex flowmeters are used for steam measurement. The information that should be paid attention to is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Vortex flowmeter for steam measurement should pay attention to the steam is divided into saturated steam and superheated steam, in general, the vortex flowmeter manufacturers will give saturated, superheated steam mass flow range table for user selection, in order to determine the size of the caliber . For superheated steaming. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the article details of the matters needing attention when vortex flowmeters are used for steam measurement. Vortex flowmeter for steam measurement should pay attention to the steam is divided into saturated steam and superheated steam, in general, the vortex flowmeter manufacturers will give saturated, superheated steam mass flow range table for user selection, in order to determine the size of the caliber . For superheated steam, temperature and pressure compensation should be performed, and for true saturated steam, only temperature or pressure compensation should be performed. When measuring, check the density table according to the temperature and pressure to obtain the required mass flow. In the actual measurement, due to the change of working conditions, both saturated steam and superheated steam may deviate from the original design state, which makes the relationship between the density of steam temperature and pressure usually changed, which affects the measurement accuracy. 1. In the flow calculator, the mass flow rate of superheated steam can be calculated according to the temperature and pressure of the superheated steam. However, when the superheated steam is transported over a long distance, or due to improper pipeline insulation measures, the temperature is often lost due to heat. The reduction makes it enter the critical saturation state from the superheated state, and even part of the steam condenses and undergoes a phase change and becomes water droplets, which becomes wet saturated steam (supersaturated steam). The output of the vortex flowmeter is only proportional to the flow velocity of the fluid flowing through the measuring tube. When measuring the humidity and saturated steam, the influence of water droplets on the output of the vortex flowmeter is negligible, so it can be considered that the output of the vortex flowmeter is completely determined by Wetting is caused by the dry part (saturated part) of each steam, and the density of the dry part can be accurately detected according to pressure compensation or temperature compensation. During steam measurement, if the two parties agree to settle the fee according to the dry part of the steam and no charge for the condensate water, the effect of the phase change on the measurement is negligible and can be ignored; if the condensate water is also charged as the steam, the measurement result of the vortex flowmeter is low. 2. Wet saturated steam When the vortex flowmeter is installed in the pressure reducing valve, the wet saturated steam is suddenly decompressed by a large amount, the fluid expands adiabatically, the water droplets partially evaporate, and at the same time absorbs the heat of vaporization from the liquid phase and the vapor phase, so that the steam The temperature of the liquid phase is reduced. If the temperature is not reduced much or the humidity is high before evaporation, the temperature will be rapidly reduced to the saturation temperature corresponding to the new pressure, and a new equilibrium will be established. At this time, the steam is still saturated steam. If the pressure decreases If it is too much or the humidity is low before evaporation, the temperature will still be higher than the saturation temperature corresponding to the new pressure after the temperature is lowered due to the evaporation of water droplets, and the steam will become superheated steam. After the above evaporation occurs, the former has no effect on the compensation, only the dry part in the steam increases, and the dryness increases accordingly. In the latter case, the wet saturated steam becomes superheated steam, and the influence on the flowmeter is as follows Three situations: (1) The design has taken into account that the steam becomes superheated, or it is difficult to determine what state it is in, or sometimes it is superheated and sometimes saturated, so the temperature and pressure compensation is used, the above phase transition has no effect on the measurement results. influences. (2) Considering saturated steam in the design, and using pressure compensation, the above phase transition will bring a small error, that is, the compensation error caused by the density difference corresponding to the difference between the superheated steam temperature and the saturated steam temperature. (3) The saturated steam is considered in the design, but temperature compensation is adopted, that is, the temperature of the superheated steam is regarded as the saturated temperature to check the density table, which generally causes a large error. There are three ways to solve the above problems: (1) Install the total steam flowmeter before the pressure reducing valve. Since the above steam has not been decompressed, there is no phase change problem, so install the flowmeter before the pressure reducing valve, press The saturated steam compensation method can ensure the measurement accuracy. (2) If the flowmeter can only be installed behind the pressure reducing valve, an additional pressure transmitter can be installed for temperature and pressure compensation. (3) If the stability of the pressure reducing valve is good, the upstream pressure value of the flowmeter can be set as a constant value in the display instrument for temperature and pressure compensation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Vortex flow meter for steam measurement should pay attention to'
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Abstract: The information on how to adjust the sensitivity of the vortex flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range and high precision, and is almost independent of fluid density, pressure, temperature, etc. when measuring the volume flow under working conditions. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the article on how to adjust the sensitivity of the vortex flowmeter. Vortex flowmeters are mainly used for flow measurement of medium fluids in industrial pipelines, such as gas, liquid, steam and other media. It is characterized by small pressure loss, large measuring range, high precision, and is almost not affected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring the volume flow of the working condition. When the vortex flowmeter has no liquid flow in the pipeline, the receiver counts abnormally due to the noise generated by the pipeline vibration. At this time, the sensitivity of the meter should be adjusted. 1. Adjustment of amplifier gain Generally, there is no need to adjust the gain of the vortex flowmeter amplifier unless the sensor is replaced. Adjust the amplifier gain through the AMP potentiometer on the amplifier board A, and monitor the amplified eddy current waveform on the oscilloscope. At the minimum flow rate, the peak value of the eddy current waveform is about 100mVP-P. 2. Adjustment of trigger level The increase of trigger level (sensitivity of pulse generation) will reduce the sensitivity of flow rate. When there is no liquid flow in the pipeline, abnormal pulse generation caused by pipeline vibration and pulsating flow noise can be effectively dealt with by increasing the trigger level. The trigger level is adjustable via the TRG potentiometer on the vortex flowmeter amplifier board, and whenever the peak of the amplified eddy current waveform exceeds a predetermined trigger level, it is converted into a pulse. Therefore, flow sensitivity decreases as the trigger level is increased. When the trigger level is changed from 80mVP-P to 350mVP-P, the resulting sensitivity will be 80/350=1/4.4 (sensitivity ratio) times. When changing the sensitivity, the resulting minimum flow (the lower limit flow that can be measured) is approximately 1/(square root of sensitivity times the standard minimum flow). 3. Zero point adjustment The correct wiring of the vortex flowmeter, input a signal with zero amplitude to the vortex flowmeter through the low frequency signal generator, adjust the zero point adjustment potentiometer, the display value of the digital multimeter should be 4mA. 4. Full-scale adjustment If you do not know the full-scale frequency of the instrument, you can adjust the instrument by calculating the full-scale frequency B through the maximum flow rate. The relationship is: fmax=Kmax Correct wiring, the vortex flowmeter generates a signal The output signal of the generator is sent to the charge amplifier, the amplitude of the input signal is increased, the output square wave is converted, and the output frequency of the signal generator is changed until the value displayed on the frequency meter is the full-scale frequency calculated by the above formula. At this time, the fixed frequency remains unchanged, and the range potentiometer is adjusted until the indicated value of the digital multimeter is 20mA. 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 adjust the sensitivity of the vortex flowmeter'
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Abstract: The relevant information of hardware accessories and precession vortex flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. At present, my country's construction machinery industry is in a high-level operation stage, and construction machinery enterprises have shown a prosperous situation. However, the accessories are like a rope around the neck of the enterprise, making it difficult to sleep and sleep. Recently visited China Construction Machinery Industry Association. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of related articles about hardware accessories and precession vortex flowmeters. At present, my country's construction machinery industry is in a high-level operation stage, and construction machinery enterprises have shown a prosperous situation. However, the accessories are like a rope around the neck of the enterprise, making it difficult to sleep and sleep. Recently, I visited Ma Chuanwei, Secretary General of Construction Machinery Parts Branch of China Construction Machinery Industry Association, and asked him to talk about the current problems in my country's construction machinery parts industry and analyze the development prospects. At present, my country's construction machinery, especially small construction machinery, has broad market prospects, and the market for small digging is very clear.“Eleventh Five”At the end, the market demand for small mining may reach 50,000 units. In addition, the small construction machinery markets such as lift-boom forklifts, skid steer loaders, and gangbush are also in the process of cultivation and will have great development. But so far, the pumps, valves, hydraulic parts and other accessories required by small construction machinery are basically all imported. The foreign accessory companies must first meet the needs of their domestic companies, secondly they must meet the needs of foreign-funded companies in China, and thirdly, they must take into account the needs of my country's local companies. The restrictive effect of this situation on my country's construction machinery production enterprises will become more and more obvious. This year, among Chinese construction machinery companies, some companies have paid foreign accessories companies for a year and a half, but still could not get the goods, such as Hefei Zhenyu; if everything is installed, just wait for a valve, but Japanese companies are late Those that cannot be supplied late, such as Yuchai Machinery; last year's Xu Excavation Machinery, ordered orders from Japanese companies at the beginning of the year, but still did not deliver the goods by the end of the year, resulting in zero output of excavators. Not only the supply period cannot be guaranteed, but also the price of a complete set of hydraulic systems purchased from abroad generally has no room for negotiation; coupled with factors such as insufficient pre-sales and after-sales services, the development of domestic construction machinery enterprises is greatly restricted. Choosing a Breakthrough In view of the overall development level of my country's construction machinery and the current specific situation, Ma Chuanwei suggested that small excavators and other small construction machinery accessories should be used as a breakthrough to promote the overall development of my country's construction machinery accessories industry. At the annual meeting of China's construction machinery accessories industry, Ma Chuanwei and the relevant person in charge of the accessories branch suggested that manufacturers should pay attention from only focusing on small digging accessories to other small construction machinery accessories, and take small digging accessories as a breakthrough. , to drive the comprehensive development of other small construction machinery accessories. In order to realize the comprehensive development of small construction machinery accessories including small excavation, realizing its hydrostatic transmission is an important link. At present, among the small construction machinery, such as small wheel loaders, backhoe loaders (both busy), skid steer loaders, telescopic forklifts and small tonnage forklifts and other hydrostatic transmission models require large hydraulic parts. Partly depends on imports. Internationally, most of the loaders below 3.0 tons in advanced countries have achieved hydrostatic transmission, while almost all of the loaders with an annual output of more than 100,000 units in my country are hydraulic transmission. At present, the only company in China that can produce hydrostatic transmission accessories is Shandong Longtai. This private enterprise can produce hydrostatic transmission loaders under 3.0 tons, but it has only started production and is not mature, and it is still producing complete machines. In addition to the restrictive factor of key technology, Ma Chuanwei believes that another important aspect of the gap between Chinese construction machinery accessories and foreign products lies in their reliability. It is reliable to produce ten or eight pieces in small batches, but it is not reliable if the quantity is too large. Product reliability is related to management, process equipment and process route. In general, the main factors affecting the reliability of Chinese accessories are raw materials, especially the quality of steel. Domestic construction machinery enterprises are generally not large in scale. They request special purchases from steel mills, and others ignore them. There is also a gap in technology and equipment with foreign countries. There are flexible production lines in foreign countries, and each procedure is strictly controlled. There are also problems with heat treatment. The reliability of the accessories produced in this way is not good, which leads to the inability to improve the quality of the host. For example, the construction machinery products produced by foreign enterprises generally have the first failure after 1000 hours, while our products only have 400 or 500 hours. If the reliability problem is not solved, users will not buy it no matter how cheap it is. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Association of Hardware Fittings with Precession Vortex Flow Meter'
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