Introduction of precession vortex flowmeter ST-LUX series intelligent precession vortex flowmeter adopts the latest microprocessor technology, which has the advantages of strong function, wide flow range, simple operation and maintenance, convenient installation and use, and its main technical indicators have reached the advanced level of similar products abroad. Widely used in gas measurement in petroleum, chemical industry, electric power, metallurgical coal and other industries. Saint lux

principle of operation

The flow curve of the flow sensor is similar to that of a venturi. A set of spiral guide vanes is placed on the inlet side. When the fluid enters the flow sensor, the guide vanes force the fluid to generate violent vortex. When the fluid enters the diffusion section, the vortex is affected by the backflow and starts to rotate for the second time, forming a gyro vortex precession phenomenon. The precession frequency is proportional to the flow velocity and is not affected by the physical properties and density of the fluid. The precession frequency of fluid secondary rotation measured by the detection element can obtain good linearity in a wide flow range. The signal is amplified, filtered and shaped by a preamplifier, and then converted into a pulse signal proportional to the flow rate, and then sent to a microprocessor for integration with detection signals such as temperature and pressure. Finally, the measurement results (instantaneous flow rate, cumulative flow rate and temperature and pressure data) are displayed on the LCD screen. The flowmeter is a compact vortex precession flowmeter structure, which mainly consists of a shell, a vortex generator, sensors (temperature, pressure and flow), a rectifier, a bracket and a converter. Operating conditions of precession vortex gas flowmeter Ambient temperature: -30℃~+55℃ Relative humidity: 5%~95% Medium temperature: -30℃~+80℃ Atmospheric pressure: 86kPa~ 106kPa.

main feature

1. Built-in pressure, temperature and flow sensors have high safety performance, compact structure and beautiful appearance. 2. On-site display of temperature, pressure, instantaneous flow and cumulative flow. 3. Using new signal processing amplifier and unique filtering technology, the interference signals caused by pressure fluctuation and pipeline vibration are effectively eliminated, and the anti-interference ability of the flowmeter is greatly improved, so that the small flow rate has excellent stability. 4. Unique time display and real-time data storage function can ensure that internal data will not be lost under any circumstances and can be stored permanently. 5. The power consumption of the whole machine is extremely low, and it can run with built-in battery for a long time, so it is an ideal local display instrument without external power supply. 6. Reliable anti-theft function and password protection to prevent parameter change. 7. The meter head can rotate at will 180 degrees, which is convenient for installation. ★ No mechanical moving parts, corrosion resistance, stability and reliability, long service life, long-term operation without special maintenance; ★ Adopt 16 bit computer chip, with high integration, small size, good performance and strong function of the whole machine; ★ Intelligent flowmeter integrates flow probe, microprocessor, pressure and temperature sensors, and adopts built-in combination to make the structure more compact, which can directly measure the flow, pressure and temperature of fluid, and automatically track, compensate and correct the compression coefficient in real time; ★ Double detection technology can effectively improve the detection signal strength and suppress the interference caused by pipeline vibration; ★ Chinese character dot matrix display screen is adopted, which has many display digits, intuitive and convenient reading, and can directly display the volume flow in working state, volume flow and total amount in standard state, and parameters such as medium pressure and temperature; ★ EEPROM technology is adopted, which is convenient for parameter setting and can be permanently stored, and historical data can be stored for up to one year; ★ The converter can output frequency pulses and 4-20mA analog signals, has RS485 interface and HART protocol, can be directly connected with a microcomputer, and the transmission distance can reach1.2km; ; ★ The FM data collector of our company can be used for remote data transmission through the Internet or telephone network; ★ Pressure and temperature signals are input by the transmitter, which is highly interchangeable; ★ The power consumption of the whole machine is low, and it can be powered by built-in battery or external power supply.

Matters needing attention

Any measuring instrument has its particularity, and intelligent vortex precession flowmeter is no exception. In order to make the instrument better serve the flow measurement, the practical experience in the production site shows that the following precautions should be paid enough attention by the relevant management and use departments. (1) Pay attention to instrument selection. When the instrument type has been selected (such as intelligent vortex precession flowmeter), the selection of instrument specifications and its supporting components is very important. In short, if you choose well, you can use it well. Therefore, two basic principles should be grasped in the process of type selection; Namely: first, to ensure the accuracy of use, and second, to ensure the safety of production. In order to achieve this, three selection parameters must be realized, namely, the maximum, minimum and common instantaneous flow in the near and long term (mainly used to select the size and specification of the instrument), the design pressure of the measured medium (mainly used to select the nominal pressure grade of the instrument) and the working pressure (mainly used to select the pressure grade of the instrument pressure sensor). ② On the one hand, the calibration before use takes into account that there are still some difficulties in the field verification of such instruments at present. In addition, if the purchase intention is to apply the instrument to more important metering occasions, such as large-flow trade metering or controversial metering points, and the application site does not have the conditions for online flow calibration, then in this case, it is too early to easily judge that all the performance of the instrument is qualified only by 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 in the future work, before the formal installation, it needs to be sent to a department with verification ability and qualification in this field for system verification within the full flow range. (3) Do a good job in process installation. Although this instrument does not have too many special requirements for process installation and use environment, any flow measuring instrument has such a * * * attribute, that is, it tries to avoid vibration and interference with flow components (such as compressors, separators, pressure regulating valves, large and small heads, manifolds, elbows, etc.). ) In the high temperature environment, keep the inner wall of the straight pipe section before and after the instrument smooth and straight, and ensure that the measured medium is a clean single-phase fluid. ④ Strengthening post-management Although the instrument has many automatic disposal functions and micro-power consumption characteristics, it still needs to strengthen management after it is put into operation. For example, in order to ensure the accuracy and reliability of the long-term operation of the instrument (to avoid accidental shutdown and data loss), the system should be calibrated regularly (every 1 ">~ 2 years), copy the header data (daily or weekly), change the medium parameters (monthly or quarterly), and check the battery status, instrument coefficient and lead seal from time to time. ⑤ Pay attention to internal maintenance If it is necessary to regularly check or clean the measuring cavity and its components of the instrument due to impure temperament or other reasons, then one thing must be paid special attention to: for vortex precession flowmeter with the same specification, its core components such as vortex generator and deflector cannot be interchanged, otherwise it is necessary to recalibrate the measuring coefficient of the instrument and systematically correct its temperature and pressure sensors.

operating characteristic

1. No mechanical moving parts, corrosion resistance, stability and reliability, long service life, long-term operation without special maintenance; 2. Using 16-bit computer chip, with high integration, small size, good performance and strong overall function; 3. The intelligent flowmeter integrates the flow probe, microprocessor, pressure and temperature sensors, and adopts the built-in combination to make the structure more compact, which can directly measure the flow, pressure and temperature of fluid, and automatically track, compensate and correct the compression factor in real time; .4. Dual detection technology can effectively improve the detection signal strength and suppress the interference caused by pipeline vibration; 5. Adopt domestic leading intelligent anti-seismic technology to effectively suppress interference signals caused by vibration and pressure fluctuation; 6. Chinese character dot matrix display screen is adopted, which has many display digits, intuitive and convenient reading, and can directly display the volume flow in working state, volume flow and total volume in standard state, and parameters such as medium pressure and temperature; 7. EEPROM technology is adopted, which is convenient for parameter setting and can be permanently stored, and historical data can be stored for up to one year; 8. The converter can output frequency pulse, 4 ~ 20mA analog signal, has RS485 interface, can be directly connected with a microcomputer, and the transmission distance can reach1.2 km; ; 9. Using the company's FM data collector, remote data transmission can be carried out through the Internet or telephone network, and the transmitter inputs the pressure and temperature signals of 10, which is highly interchangeable; 1 1. The power consumption of the whole machine is low, and it can be powered by a built-in battery or an external power supply. 2. Main Uses vortex precession flowmeter can be widely used in petroleum, chemical industry, electric power, metallurgy, urban gas supply and other industries to measure various gas flows, and it is the first choice for oil field and urban natural gas transmission and distribution measurement and trade measurement at present. 3. Working conditions Ambient temperature: -30℃ ~+55℃ Relative humidity: 5% ~ 95% atmospheric pressure: 86 kPa ~ 106 kPa 4. Working conditions Medium temperature range: -20℃ ~+70℃ Nominal pressure: 1.6, 2.5, 4.0, 4.0.

develop

The development of flow measurement can be traced back to ancient water conservancy projects and urban water supply systems. In the era of Caesar in ancient Rome, orifice plates were used to measure the drinking water of residents. Around 1000 BC, ancient Egypt used the weir method to measure the Nile flow. The famous Dujiangyan water conservancy project in China uses the bottle mouth water level to observe the water quantity and so on. /kloc-in the 0/7th century, Torricelli laid the theoretical foundation of differential pressure flowmeter, which is a milestone of flow measurement. Since then, the rudiments of various types of flow measuring instruments in the 18 and 19 centuries have begun to take shape, such as weir type, tracer method, pitot tube, venturi tube, volumetric type, turbine type and target flowmeter. In the 20th century, the rapid growth of demand for flow measurement in process industry, energy metering and urban public utilities promoted the rapid development of instruments. The rapid development of microelectronics and computer technology has greatly promoted the upgrading of instruments, and new flowmeter has sprung up like mushrooms after rain. So far, it is said that hundreds of flowmeters have been put into the market, and many problems in field use are expected to be solved. The work of modern flow measurement technology in China is relatively late, and all the flowmeters needed in the early stage are imported from abroad. Flow measurement is a science that studies the quantitative change of substances, and the law of mutual change of mass is the basic law of the development of things, so its measurement object is not limited to pipeline liquid in the traditional sense, and there are problems in flow measurement wherever quantitative change is needed. Flow rate, pressure and temperature are juxtaposed as three major detection parameters. For a certain fluid, as long as these three parameters are known, its energy can be calculated, and these three parameters must be detected in the measurement of energy conversion. Energy conversion is the basis of all production processes and scientific experiments, so flow, pressure and temperature instruments are widely used.