Abstract: the gas flow meter scale using previous note information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. A new installation, commissioning of new type selection design or gas flowmeter measurement system; After we install check, after confirmed, should work for commissioning test. In the commissioning work, we must, in accordance with the following procedures. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a gas flow meter scale using previous note article details. A new installation, commissioning of new type selection design or gas flowmeter measurement system; After we install check, after confirmed, should work for commissioning test. We in the commissioning work, must be conducted in accordance with the following procedures: 1. First of all, shut off the meter switch valve and control valve; Then slowly open the bypass valve. 2. After zui, start work flow meter. In start flowmeter work, going to have some problems: (1) with electric remote integrating flowmeter, first connect the power cord and signal lines, preheated. Our solution is: first, slowly open the flow meter in front of the switch valve; Then slowly open the flowmeter after regulating valve; Slowly close the bypass valve after zui, make flowmeter work under normal traffic. (2) when the measurement of body temperature is very high, and the temperature of the temperature difference is very big to the environment. Our solution is: when will preheat for metering system; Makes the flow meter and piping system slowly heat up, to ensure the normal work of the flowmeter. 3. Later, we observed record all operation parameters change state, such as: temperature, pressure, etc. If the system is not too big vibration and noise and leakage; And, after a stable operation for a period of time, end of commissioning. Second, the normal operation after commissioning normal, can be put into normal operation. In the process of operation, use and maintenance of flowmeter, the operator should do the following several aspects: 1. Regular inspection on measurement system, maintenance. Operator inspection on flow meters, valves and piping system. Operators of equipment maintenance mainly in: a. Safety valve, metering valves and alarm protection devices; b。 Flow display instrument, recording device, compensation device such as flow auxiliary equipment; c。 Filter, venting device and other supporting facilities. 2. Startup and shutdown flowmeter work, should be performed in accordance with the order of the preproduction. 3. During normal operation, the operator should always pay attention to the measured medium parameters such as pressure, temperature, flow rate and viscosity; See if these parameters in accordance with flowmeter using range. Over the years, shaanxi saide automation equipment manufacturing with high-end research and development team, combined with the scientific management model, developed anticorrosive nozzle type vortex flowmeters, high overload resistance stability target flowmeter, diving type electromagnetic flowmeter, small flow monitoring thermal type gas mass flowmeter, and a series of new type of flow meters. Over the years insist on innovation, enterprising, good faith business philosophy, strictly abide by the international quality management system and continually improve product quality and constantly develop new products, already developed now become reasonable product structure, zui complete variety of flow meter production base in China. At present, the products are widely used in water conservancy, environmental protection, water supply and drainage, sewage treatment, electric power, papermaking, petrochemical, metal, food and other industries. 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 electromagnetic flow meter scale if you do not receive the signal or what reason is too weak information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter can't get a signal or too weak if what is provided by jiangsu golden lake union instrument self-control, thank instrument exhibition network to support general electromagnetic flowmeter under the premise of no maintenance after installation can run normally for a long time, after. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flow meter scale if you do not receive the signal or too weak is the reason why the article details. Electromagnetic flowmeter can't get a signal or too weak if what is provided by the golden league meter self-control, thank instrument exhibition network to support general electromagnetic flowmeter under the premise of no maintenance after installation can run normally for a long time, after need maintenance and daily inspection. Not receive signal or the signal is too weak are minor issues. So also need not surprised, do the following steps can be readily solved. 1. First confirm whether the pipe filled with fluid. 2. If the pipe is too close to the wall, can be in the Angle of the probes are installed on pipe diameter, and haven't installed in a horizontal pipe diameter, should choose Z method to install the probe. 3. Dense part carefully selected pipes and fully polished bright, daub is full of lotus root mixture installed probe; 4. Respectively in carefully install near the point of each probe, slowly moving to find zui large signal points, prevent because of pipe wall scaling or because local deformation is expected to lead to the ultrasonic beam reflected area and miss can receives the strong point of installation; 5. For wall scaling serious metal pipe can use of ways to make scale parts fall off or crack, but note that this method can sometimes because of scale and gaps between the lining and the useless at ultrasonic transmission. Now you know about this problem? Simple. These problems to start selection and installation of the time should be solved. 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 ensure the accuracy of turbine flow meter measurement is provided by excellent flow meter and flow meter manufacturers. How to ensure the accuracy of turbine flowmeter measurement Turbine flowmeter is currently widely used in petroleum, chemical, electric power, metallurgy, urban gas supply and other industries for various gas flow measurement sensors, the correct use of turbine flowmeter to follow the following five points . More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the article details on how to ensure the accuracy of turbine flowmeter measurement. How to ensure the accuracy of turbine flowmeter measurement Turbine flowmeter is a sensor widely used in petroleum, chemical, electric power, metallurgy, urban gas supply and other industries to measure various gas flow. The correct use of turbine flowmeter should follow the following five requirements , so as to ensure the accuracy of the measurement. 1. Pay attention to the selection of instruments. When the type of flow sensor has been selected, the selection of the specifications of the flow sensor and its supporting components is very important. In a word, you can use it well when you choose it. To this end, two basic principles should be grasped in the selection process; namely: one must ensure the accuracy of use, and the other must ensure production safety. To do this, three selection parameters must be implemented, namely, the maximum, minimum and commonly used instantaneous flow rates in the near and long term, the design pressure of the measured medium, and the working pressure. 2. Carry out pre-use calibration On the one hand, considering that there are still some difficulties in the field verification of this type of flow sensor. In addition, if the purchase intention is to use this kind of flow sensor in more important measurement occasions, such as large-flow trade measurement or measurement points with prominent measurement disputes, and the application site does not have the conditions for online calibration of flow, In this case, it is too early to easily determine that all the performances of the flow sensor are qualified based on a factory certificate provided by the manufacturer at the time of purchase. Therefore, in order to ensure the reliability and accuracy of the measurement results of the flow sensor in the future work process, it is necessary to send the flow sensor to the department with the verification ability and qualification for a system verification within the full flow range before the formal installation. . 3. Do a good job in process installation Although this kind of flow sensor does not have too many special requirements for process installation and use environment, any type of flow measurement instrument has such a commonality, that is, to avoid vibration and high temperature environment as much as possible. Interfering elements, keeping the inner wall of the straight pipe section before and after the flow sensor smooth and straight, ensuring that the measured medium is a clean single-phase fluid, etc. Fourth, strengthen post-management Although this kind of flow sensor has the characteristics of various automatic disposal functions and low power consumption, it still needs to strengthen the management after it is put into operation. For example, in order to ensure the accuracy and reliability of the long-term operation of the flow sensor, it is necessary to regularly calibrate the system, copy the meter data, replace the medium parameters, check the battery status from time to time, check the flow sensor coefficient and lead seal, etc. 5. Pay attention to internal maintenance If the measuring cavity of the flow sensor and its components need to be regularly inspected or cleaned due to air pollution or other reasons, then one point must be paid special attention: for the turbine flowmeter of the same specification, the vortex generator The core components such as , guide fluid, etc. cannot be interchanged, otherwise, the metering coefficient of the instrument must be re-calibrated and the temperature and pressure sensors equipped with it must be systematically calibrated. If the five requirements of flow sensor selection, calibration, process installation, post management and internal maintenance are well grasped, the use of sensors will be reduced a lot in the future, which is especially important for continuous production manufacturers. 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 turbine flow meter measurement'
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Abstract: The research information of V-cone flowmeter is provided to you by excellent flowmeter and flowmeter production and quotation manufacturers. In recent years, with the continuous progress of electronic technology and computer technology, flow measuring instruments have also begun to develop in the direction of integration and intelligence. Among them, the intelligent flowmeter is a very widely used intelligent flow measurement instrument. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the research articles on V-cone flowmeters. In recent years, with the continuous progress of electronic technology and computer technology, flow measuring instruments have also begun to develop in the direction of integration and intelligence. Among them, smart flowmeter is a very widely used intelligent flow measurement instrument. It measures flow signals from different types of flow transmitters, supplemented by temperature and pressure obtained by temperature transmitters and pressure transmitters. The compensation signal performs real-time flow compensation for different fluids according to different algorithms, thereby realizing the measurement, accumulation, display and output of fluid volume flow or mass flow. In addition to these basic functions, the current flow totalizer also has additional functions such as recording, communication, printing, etc., and has certain fault diagnosis and self-recovery capabilities. The intelligent V-cone flowmeter is in“V”It was developed on the basis of the type inner cone throttling device. It can detect temperature, differential pressure and absolute pressure signals at the same time, and can perform real-time temperature and pressure compensation for flow. In the flow algorithm, floating-point numbers are used for operations, and at the same time, the fast rooting algorithm based on Newton's iteration method is used to perform the square rooting of floating-point numbers. 1 Working principle of V-cone flowmeter and temperature and pressure compensation“V”Type throttling device, temperature sensor, pressure sensor, etc. The conversion part includes acquisition circuit, SD16_A, liquid crystal display circuit, etc. 1.1.1 Flow measurement V-cone flowmeter uses a V-shaped pointed cone coaxially installed in the pipeline to gradually throttle and shrink the fluid to the inner wall of the pipeline, and measure the differential pressure before and after the V-shaped inner cone. measure flow. The V-cone throttling device consists of a pointed cone mounted coaxially in the measuring tube and a corresponding pressure-taking port. The measuring tube is pre-machined and produces differential pressure at both ends of the pointed cone. The high pressure (positive pressure) of this differential pressure is the static pressure p1 measured at the pressure-taking port of the pipe wall before the upstream fluid shrinks, while the low pressure (negative pressure) is at the end face of the cone toward the downstream and at the center axis of the cone. Take the pressure p2 at the pressure hole, as shown in the figure. The tip of the cone faces the incoming flow, and there is a sharp, acute angle between the cone and its trailing face. The edge of this interface allows the fluid to have a smooth transition zone before entering the downstream low pressure zone and finally allowing the fluid to flow through the annular gap between the cone and the pipe. Fig. 1 Working principle diagram of V-cone flowmeter The calculation of flow rate is derived from Bernoulli's equation. The conclusion is that the flow in the flow tube is the same as“V”The square root of the differential pressure before and after the throttling element is proportional to the square root, and the calculation formula of the volume flow is as follows: (1) In the formula: qm is the volume flow value, kg/s; c is the outflow coefficient; ε is the expansion coefficient;βis the equivalent diameter ratio; d is the equivalent opening diameter;ρis the density of the fluid, g/m3; Δp is the differential pressure value, ΔP=P1-P2Pa. 1.1.2 Outflow Coefficient C According to ISO4006, the outflow coefficient of throttling flowmeter is defined as the ratio of incompressible fluid flow, actual flow and theoretical flow (for compressible fluid, the ratio is equal to the outflow coefficient multiplied by the expansion coefficient ); for V-cone flowmeter, because there is no standard document to follow, it must be measured with an incompressible fluid. The following is the calibration device designed to calibrate the outflow coefficient in the experiment, as shown in Figure 2. Figure 2 The measuring cylinder of the outflow coefficient calibration device measures the actual volume flow, and the V-cone flowmeter measures the theoretical flow value. For each V-cone flowmeter, the outflow coefficient C used in the flow equation is obtained by flow calibration. The typical value range of C is 0.75～0.85. 1.1.3 Gas expansion coefficient of V-cone flowmeter If the measured medium is gas or steam, the Bernoulli equation must be corrected with the gas expansion coefficient ε. This is due to the gas density across the throttle due to pressure changesρThe changes do not apply to liquids. The expansion coefficient ε is 1 for liquids, and ε<1 for gases and vapors. According to the expansion coefficient of gas defined in ISO4006: (2) (3) where C is the outflow coefficient calibrated above. Although there is no standard document available, due to the limited existing conditions, the expansion coefficient cannot be calibrated with a device like the outflow coefficient. So here I use the conclusions given by three doctors from NEL laboratory and McCrometer Company in a paper of an international traffic conference in 2001. The basic idea is: according to ISO5167, the C·ε and Δp/(k·p1) is regarded as a linear relationship, and the gas is used as the medium test, the product of C and ε is obtained, and then the expansion coefficient can be obtained by removing the outflow coefficient. In this subject, their fitting formula is not directly quoted, but the formula fitted by Professor Xu Ying of Tianjin University is adopted. The fitting formula is as follows:
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Overview The level parameter of the new dry process cement production line is one of the main measurement parameters for production control. With the improvement of the automation level of cement production and the reliability requirements of the control system, the role of material level measurement and control is becoming more and more prominent, which plays a very important role in production control and management. There are many methods for level detection, such as contact type, non-contact type, limit type, continuous type, 3D level detection, etc. The level measurement of the cement production line is mainly based on solid level measurement, and there is also a small amount of liquid level measurement. The solid materials are mainly block materials, granular materials and powder materials. The dielectric constant, bulk density, temperature and moisture content of these materials are different, and the requirements for measuring instruments are also different. With the development of level measurement instrument technology, the past measurement methods such as contact type and limit type have been seldom used in production control. In the new cement production line, the level measuring instruments are mainly radar level gauges. Features of Radar Level Gauge Radar level gauges began to be used in the late 1990s. The microwave frequency range is 300MHz to 300GHz, and the propagation speed is the speed of light. The microwave penetrating power is strong, the transmission speed is not affected by dust, steam and medium components, and the transmission attenuation is also small. The radar level gauge uses the principle of echo ranging. The transmitting antenna transmits microwaves to the measured target, and the microwaves reflected by the measured target are received by the receiving antenna, and the signal processor compares the transmitted signal with the received signal to calculate the measured distance. Since the microwave has attenuation and interference reflection on the propagation path, the key to the measurement is to be able to receive the reflected echo and identify the effective echo. The received echo energy is related to the transmitting and receiving efficiency of the antenna and the radiation power of the antenna, so the antenna design and shape of the radar level gauge are critical. The received echo energy is related to the dielectric properties of the material surface. The higher the dielectric constant value ε, the higher the reflectivity, and the higher the echo intensity. When the dielectric constant value ε is low, the material will absorb part of the microwave energy, and the echo intensity is also low. Usually the dielectric constant value ε of the material to be tested is required: liquid is ε>1.8, solid ε>2.5. Cement plant solid dielectric constant value ε>2.5, the dielectric constant value ε of cement is 3. Radar level gauges are usually divided into two categories: pulse radar (Pulse) and frequency modulated continuous wave radar (FMCW). Process monitoring occasions mainly use pulse radar level gauges. The currently used pulse radar level gauges are divided into low frequency and high frequency. Compared with the low-frequency pulse radar level gauge, the high-frequency pulse radar level gauge has the following advantages: high energy, small beam angle, small antenna size, and high precision. However, low-frequency radar has low energy and scattered energy, so the launch angle is large and the directivity is poor. The wavelength of 26GHz radar is 11mm, and the wavelength of 6GHz radar is 50mm. When the radar level gauge measures the material level, the radar wave reflection mainly comes from the diffuse reflection of the material surface. The intensity of the diffuse reflection is proportional to the size of the material and inversely proportional to the wavelength. 3 Selection of Radar Level Meter In cement factories, limestone silos, gypsum silos, etc. to store bulk materials, clinker silos to store granular materials, raw meal homogenization silos, cement silos, carbide slag silos, etc. to store powdery materials. The stored materials are different, and the selected instruments are also different. When used to measure the storage body level of bulk materials and granular materials, because these materials are densely packed in the storage, the dielectric constant is stable, and the microwave reflection intensity is high. The dust generated by solid materials during the feeding process is much smaller than that of powder materials, and has little effect on the attenuation of radar acoustic signals. According to the material repose angle and surface conditions formed by feeding and unloading, after determining the effective range, a radar level gauge with a rod or horn antenna is used.
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