Vortex flow meter

A vortex flow meter is a type of flow meter that is developed based on the Karman vortex principle, and it is used to measure the volumetric flow rate, the volumetric flow rate under standard conditions, or the mass flow rate of gases, steam, or liquids. It is mainly used for measuring the flow rate of fluids in industrial pipelines, such as gases, liquids, steam, and various other media. It is characterized by low pressure loss, a wide measurement range, and high accuracy; when measuring volumetric flow rate under operating conditions, it is hardly affected by parameters such as fluid density, pressure, temperature, and viscosity. There are no moving mechanical parts, thus it offers high reliability and requires minimal maintenance. The instrument parameters can remain stable over the long term. Vortex flow meters use piezoelectric stress sensors, offering high reliability, and can operate within a temperature range of -20°C to +250°C. It provides both analog standard signals and digital pulse signals for output, making it easy to integrate with digital systems such as computers; it is a relatively advanced and ideal measuring instrument.

The full-length vortex street can be used in situations where the measurement performance of electromagnetic flowmeters is poor; as long as the vibration and temperature of the pipeline being measured are within reasonable ranges, it can be utilized

Gases, steam, deionized water. Generally, Yokogawa is the best.

Vortex flow meters can measure the flow rate of liquid, gas, and steam fluids with a Re value in the range of 5*103 to 7*103.

Here, good vortex flow meters are rarely used; it seems they’re applied in unimportant applications

For liquid media, electromagnetic methods are considered first due to their high precision and wide measurement range; in situations such as low conductivity or high temperatures, vortex flow meters can be used as an alternative. For gaseous media, when high precision is not required, vortex flow meters are the preferred choice, as they offer integrated temperature and pressure compensation, enabling relatively accurate measurement of the gas flow under standard conditions

Vortex flow meters are most suitable for fluids that can generate vortices during flow, as well as gases and fluids with low viscosity.

Vortex flow meters are recommended for general applications; they are not suitable for applications that require high precision. Disadvantages of vortex flow meters: 1. There is a minimum flow velocity requirement for the lower flow limit, making them suitable only for situations where the flow velocity remains stable； 2. Small range ratio ； 3. The precision is not high; theoretically, it is 1.5 for gas vapor and 1.0 for liquids ； 4. Not suitable for environments with vibration.

Used in areas where the pipeline does not vibrate, and where there are no frequency converters or large electric motors nearby; the flow rate must be greater than the minimum flow rate within the measurement range of the instrument