1) Choose a reasonable installation site. The installation site should avoid strong power equipment, high-frequency equipment, strong power switch equipment; avoid high-temperature heat source and radiant heat source; avoid high temperature and strong corrosion atmosphere: avoid strong vibration and easy installation, wiring and maintenance. Vibrations due to excessively long pipes must be eliminated upstream and downstream of the sensor.

2) The instrument is generally required to be installed horizontally, and the flow direction of the fluid to be measured should be consistent with the arrow indicating the flow direction on the casing. It can also be installed vertically or tilted. When measuring the most liquid, make sure the sensor is always completely filled with liquid. In order to avoid the normal transmission of fluid during maintenance, it is recommended to add a bypass in the installation section of the instrument.

3) The vortex flowmeter has lower requirements on the straight pipe sections before and after. In principle, the straight pipe section is not required before and after the flowmeter, but generally requires a straight pipe section of 3D length in front of the instrument, and a straight pipe section of 1D length after the instrument. Special conditions require 5D and 3D lengths. When the elbow radius of a single elbow or double elbow is greater than 1.8D, the straight pipe section may not be used before and after the flowmeter.

4) The pressure compensation can be used when measuring gas or steam.

5) When the fluid to be tested contains impurities, the filter or filter should be installed in front of the instrument, but the requirements of the straight pipe in front of the instrument should be guaranteed.

6} Sensor installation method for measuring a small amount of out-of-phase gas-liquid two-phase flow. When measuring liquids, there may be a small amount of gas phase in the pipeline, the content of which does not exceed the specified gas-liquid two-phase fluid. In order to prevent gas from staying in the sensor, a gas separator must be installed. When measuring gas, when the pipeline is condensed by the measured gas, and there is an unstable liquid phase that is not removed in the gas, the liquid is prevented from staying in the sensor and installed vertically. The sensor itself should have effective holding measures when measuring high and low temperature fluids.

7) The volumetric flow rate of the measured gas measured by the meter is the actual flow rate of the measured gas under working conditions. If the actual flow rate is converted into the standard flow rate in the standard state, the calculation formula can be as follows: 4?p is the volume flow rate under the standard state; 4, is the volume flow rate under the working state; ho is the measured state under the standard state The absolute pressure of the gas; To is the thermodynamic temperature of the gas to be measured under standard conditions; the absolute pressure of the gas to be measured in the working state; T is the thermodynamic temperature of the gas to be measured under working conditions; Z is the gas to be measured under working conditions. Compression factor.

8) When the pipe is long and vibration may occur, a fixed bracket should be installed upstream and downstream of the flowmeter to prevent the pipe from vibrating. As a rule of thumb, flow measurements are susceptible to airflow pulsations and pressure changes.

9) The volume flow meter coefficient K vn and the mass flow meter factor K,,, o are determined by the calibration of the instrument at room temperature before leaving the factory. When the working state of the instrument differs greatly from the calibration state of the laboratory, the meter coefficients K, and K' should be corrected. The correction method for the meter coefficient is the same as that of the vortex flowmeter.

Any type of meter has its own particularity, and the intelligent rotary vortex flowmeter is no exception. In order to make this kind of instrument better serve the flow metering work, the practical experience from the production site shows that the following aspects should be paid attention to by the relevant management and use departments.

1 Emphasis on instrument selection In the case where the instrument type has been selected (for example, a smart spiral vortex flowmeter), it is crucial to the selection of the instrument specifications and their components. In a word, you can use it if you choose it. To this end, the two basic principles should be grasped in the selection process; that is, one must ensure the accuracy of use, and the other must ensure production safety. To do this, it is necessary to implement three selection parameters, namely the large and small and common instantaneous flow in the near and long term (mainly used for the size of the selected instrument), and the design pressure of the measured medium (mainly used for The nominal pressure level of the selected instrument) and the working pressure (mainly used to select the pressure level of the instrument pressure sensor).

2 Conducting pre-calibration on the one hand, considering the current on-site verification of such instruments, there are still such difficulties. In addition, if the intention of the purchase is to prepare the instrument for more important measurement occasions, such as the measurement points with large flow of trade measurement or measurement disputes, and the use of the site does not have the online conditions for the flow calibration, then In this case, it is too early to judge that all the performance of the watch is qualified by the one-factory certificate of proof provided by the manufacturer at the time of purchase. Therefore, in order to ensure the reliability and accuracy of the measurement results of the instrument in the future work, it is necessary to send it to the department with the verification capability and qualification in this aspect for a system verification within the full flow range before the formal installation.

3 Do a good job in process installation Although this type of instrument does not have too many special requirements for the process installation and use environment, any type of flow measurement instrument has such a commonality, that is, avoid vibration and high temperature environment as much as possible with the flow disturbance component. (such as compressors, separators, pressure regulating valves, size heads and manifolds, elbows, etc.), 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 this kind of instrument has many automatic disposal functions and micro-power consumption characteristics, it still needs to be strengthened after operation. For example, in order to ensure the accuracy and reliability of the instrument's long-term work (to avoid accidental outages and data loss), the system should be regularly scheduled (every 1~~2 years), and the meter data (daily or weekly) should be transcribed. Change media parameters (monthly or quarterly) and check battery status, check meter factor and seals from time to time.

5 Pay attention to internal maintenance If the measuring chamber and its components need to be regularly inspected or cleaned due to temperament or other reasons, then one must pay special attention: for the same size of the spiral vortex flowmeter, the vortex generator Core components such as fluid guides are not interchangeable. Otherwise, the metering factor must be recalibrated and the temperature and pressure sensors associated with it must be systematically calibrated.

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