Precession vortex flowmeter adopts the latest microprocessing technology, which has the advantages of strong functionality, wide flow range, simple operation and maintenance, and easy installation and use. Its main technical indicators have reached the advanced level of similar foreign products. Widely used in various gas metering industries such as petroleum, chemical, power, metallurgy, and coal.

Working principle of vortex flowmeter

Precession vortex flowmeter, a widely used device for fluid measurement, works based on the phenomenon of fluid vortex. When a fluid passes through a flowmeter, due to specific geometric shapes and channel designs, the fluid generates a vortex of swirling motion. The formation of this vortex is closely related to the physical properties of the fluid, such as velocity and density, so the flow rate of the fluid can be calculated by measuring the frequency or intensity of the vortex.

When the fluid flows axially and enters the flow sensor, the Precession blades force the fluid to produce rotational motion. This rotational motion triggers the formation of a vortex flow at the center of the vortex generator. Subsequently, this vortex flow continuously Precessions in the Venturi tube, and when it reaches the contraction section, its velocity is significantly accelerated due to the sudden throttling effect. Once the vortex flow enters the diffusion section, the backflow effect will force it to undergo a Precession like secondary rotation.

During this process, the rotational frequency of the vortex flow exhibits a direct and linear relationship with the velocity of the fluid medium. There are two piezoelectric sensors inside the flowmeter, which detect weak charge signals generated by vortex flow. After being amplified, filtered, and shaped by a preamplifier, these signals will be converted into two pulse signals proportional to the flow rate. The processing circuit in the calculator will compare and distinguish the phase of these two pulse signals to eliminate interference signals, and count and process the effective flow signals.

Structural characteristics of Precession vortex flowmeter

The Precession vortex flowmeter has several excellent structural features:
It can automatically compensate and correct based on the temperature and pressure of the detected medium, thereby directly detecting the standard volumetric flow rate of the gas.
Due to the absence of mechanical moving parts, this flowmeter has excellent corrosion resistance and stability, and relatively high reliability.
The flowmeter adopts a microprocessor and integrated chip to ensure high-precision computing capability.
Micro power consumption technology enables extremely low power consumption, supporting long-term battery powered operation and compatible with external power supply.
Provides 4-20mA standard current signal output and pulse output function for two-wire or three wire systems.

Installation and usage requirements for vortex flowmeter

To ensure accurate measurement and long-term stable operation of the vortex flowmeter, the following are some key installation and usage requirements:
Before installing the flowmeter, it is necessary to thoroughly clean the pipeline of debris, welding slag, and dust.
During installation, it is necessary to ensure that the flow direction of the fluid is consistent with the direction of the arrow marked on the shell.
If the pipeline is long or close to the vibration source, support structures should be installed upstream and downstream of the flowmeter to reduce the impact of pipeline vibration on measurement.
For the convenience of maintenance without affecting the normal transportation of fluids, a bypass pipeline should be installed, and the length of the front straight pipe section should be at least 5D, and the length of the rear straight pipe section should be at least 2D.
Flow meters should be kept away from strong external magnetic field interference and reliably grounded to avoid sharing with the bottom line of strong electrical systems.
When conducting pipeline pressure testing, special attention should be paid to the measurement range of the pressure sensor to prevent damage to the sensor due to excessive pressure.

Precautions for Spiral Vortex Flow Meter

Any type of measuring instrument has its own characteristics, and the intelligent vortex flowmeter is no exception. In order to better serve flow measurement work, practical experience from production sites has shown that the following precautions should be given sufficient attention by relevant management and usage departments.
① After selecting the type of instrument (such as an intelligent vortex flowmeter), it is crucial to prioritize the selection of instrument specifications and their supporting components. In one sentence, choosing the right one is the key to using it well. Therefore, in the selection process, two basic principles should be grasped; Namely: firstly, to ensure the accuracy of use, and secondly, to ensure production safety. To achieve this, three selection parameters must be implemented, namely the maximum, minimum, and commonly used instantaneous flow rates in the short and long term (mainly used to select the size specifications of the instrument), the design pressure of the measured medium (mainly used to select the nominal pressure rating of the instrument), and the working pressure (mainly used to select the pressure rating of the instrument pressure sensor).
② On the one hand, conducting pre use calibration takes into account the various difficulties that still exist in on-site calibration of such instruments today. In addition, if the intention of purchasing is to apply this type of instrument to more important measurement occasions, such as high flow trade measurement or measurement points with prominent measurement disputes, and the on-site application does not have the conditions for flow online calibration, then in this case, it is too early to easily determine that the entire performance of the meter is qualified based solely on a factory qualification 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 instrument in future work processes, it is necessary to send it to a department with the ability and qualifications to perform a full flow range system calibration before formal installation.
③ Although this type of instrument does not have many special requirements for process installation and usage environment, any type of flow measuring instrument has a commonality, which is to avoid vibration and high-temperature environment interference components (such as compressors, separators, pressure regulating valves, reducers and manifolds, elbows, etc.) as much as possible, maintain smooth and straight inner walls of the straight pipe sections before and after the instrument, and ensure that the measured medium is a clean single-phase fluid.
④ Strengthening post management: Although this type of instrument has multiple automatic disposal functions and low power consumption characteristics, it still needs to be strengthened in management after being put into operation. For example, in order to ensure the accuracy and reliability of the instrument’s long-term operation (to avoid unexpected shutdowns and data loss), regular system calibration (every 1-2 years), recording of header data (daily or weekly), replacement of medium parameters (monthly or quarterly), and irregular checks on battery condition, instrument coefficients, and lead seals should be carried out.
⑤ Pay attention to internal maintenance. If regular inspection or cleaning of the measuring chamber and its components of the instrument is required due to dirty air or other reasons, one thing must be particularly noted: for the same specification of rotary vortex flowmeter, its core components such as vortex generator and guide body cannot be interchanged. Otherwise, the instrument measurement coefficient must be recalibrated and the temperature and pressure sensors equipped with it must be systematically calibrated.