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technical article
Precautions for use of precession vortex flowmeter
2011-6-22 16:56:08

Any type of measuring instrument has its special characteristics, and the intelligent precession vortex flowmeter is no exception. In order to make this kind of instrument better serve the flow measurement 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 Pay attention to instrument selection. After the instrument type has been selected (for example, intelligent precession vortex flowmeter ), the selection of the instrument specifications and its supporting components is very important. In a word, choose well before you can make good use of it. For this reason, two basic principles should be grasped in the selection process; that is, one must ensure the accuracy of use, and the other must ensure the safety of production. To achieve this, three selection parameters must be implemented, namely the maximum, minimum, and common instantaneous flow rates (mainly used for selecting the size of the instrument) and the design pressure of the measured medium (mainly used for The nominal pressure level of the selected instrument), working pressure (mainly used to select the pressure level of the instrument pressure sensor).

② Calibration before use On the one hand, considering the current on-site verification of such instruments, there are still such difficulties. In addition, if the purchase intention is to use this meter for more important measurement occasions, such as high-volume trade measurement or measurement points with prominent measurement disputes, and the application site does not have the conditions for online calibration of the flow, then In this case, it is premature to simply determine that all the performance of the watch is qualified based on a piece of factory certificate of conformity 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 process, it is necessary to send it to the department with the capability and qualification for this aspect to perform a system verification within the full flow range before the formal installation.

③ Do a good job of process installation Although this type of instrument does not have too many special requirements for process installation and use environment, any type of flow measurement instrument has a commonality, that is, to avoid as far as possible vibration and high temperature environment interference components away from the flow state (Such as compressors, separators, pressure regulators, large and small headers and manifolds, elbows, etc.), keep the inner wall of the straight pipe section before and after the meter smooth and straight, and ensure that the measured medium is a clean single-phase fluid.

④ Strengthen later management Although this kind of instrument has a variety of automatic processing functions and micro power consumption characteristics, but after commissioning, it still needs to strengthen management. For example, in order to ensure the accuracy and reliability of the meter's long-term work (to avoid accidental outages and data loss), the system calibration should be performed regularly (every 1 ">> 2 years), and the header data should be copied (daily or weekly) , Change the media parameters (monthly or quarterly) and check the battery status from time to time, check the meter factor and lead seal, etc.

⑤ Pay attention to internal maintenance. If the measuring cavity and its components need to be regularly inspected or cleaned due to temperament or other reasons, then one point must be paid special attention to: for vortex flowmeters of the same specification, the vortex generator The core components, such as fluid guide, cannot be interchanged. Otherwise, the meter's metering coefficient must be re-calibrated and the temperature and pressure sensors must be calibrated.