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Working principle of vortex flowmeter and tips of its feature and installation

Author:vacorda    Source:vacorda.com    Date: 2018-04-25 15:22:00

Working Principle:

Vortex flow meter is a volumetric flowmeter that measures the volumetric flow of gases, vapors, or liquids, nominal volumetric flow or mass flow, based on Karman's vortex principle. The principle of the vortex flowmeter is to use piezoelectric stress sensors with high reliability and can work in the operating temperature range of -20°C to +250°C. There are analog standard signals and digital pulse signals output. It is easy to use with digital systems such as computers. It is a relatively advanced and ideal measuring instrument. According to different media and different environments, there are many types of options we can choose, such as steam vortex flowmeters, insertion vortex flowmeters, and pipeline vortex flowmeters.

vortex flowmeter

Product Features:

No moving parts, long-term stability, simple structure, easy installation and maintenance;

The sensor output is pulse frequency, its frequency is linear with the actual flow of the fluid under test, the zero point has no drift, the performance is very stable, the structure is various, there is a pipeline type, plug-in flow sensor form;

High accuracy, usually liquid measurement accuracy is ± 1.0%; gas measurement accuracy is ± 1.5%;

Measurement range is wide, in the range of 2104 ~ 7106 Reynolds number, up to 120;

small pressure loss (about 14 to 12 orifice flowmeter), belonging to energy-saving flow meter;

The installation method is flexible, according to the site process piping is not accessible, can be installed horizontally, vertically and at different angles;

Using the interference circuit and anti-vibration sensor head, it has certain resistance to environmental vibration;

Using ultra-low-power microprocessor technology, 1 section of 3V10AH lithium battery can be used for more than 5 years;

The software calibrates the non-linear coefficient of the meter to improve the measurement accuracy;

Use EEPROM to protect the accumulated flow from power-off. The protection time is more than 10 years.


Installation requirements:

1. Pipelines

The installation of the vortex flowmeter requires a certain amount of front and rear straight pipe sections. The common situation is as follows (D is the diameter of the pipe):

Pipeline Condition



Concentric tube, fully open valve



90° right angle elbow



Two 90° elbows angle in the same plane



Half-opening valve, regulating valve



Two 90° elbows angle in different planes



With rectifier tube bundle



2. Installation conditions

  • The sensor should be mounted on a pipe with the same diameter as the horizontal, vertical, and inclined (fluid flow from bottom to top). The upstream and downstream of the sensor should be equipped with a straight pipe section of a certain length. The length of the straight pipe section must conform to the requirements for the straight pipe section 15 to 20D and the straight pipe section 5 to 10D.
  • The nearby pipeline where the liquid sensor is installed should be filled with the measured liquid.
  • Sensors should not be installed on pipes with strong mechanical vibrations.
  • The inner diameter of the straight pipe section is as close as possible to the sensor diameter. If it is not consistent, a pipe with a diameter slightly larger than the sensor should be used. The error should be ≤3% and does not exceed 5mm.
  • Sensors should be installed in places with strong electromagnetic interference, small space, and inconvenient maintenance.

vacorda vortex flowmeter installation condition


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