Compact Vortex Shedding Flow Meter - For Liquids and Gases

The Compact Vortex Shedding Flow Meter is a flow sensor based on the “Karman vortex street” principle. It features a compact structure, lightweight design, and better price. It can be installed on various devices. It can be used not only for measuring the flow rate of common liquids such as water and oil, but also for measuring gases.

RFQ Vortex Flow Meters

Features

Simple and robust structure, easy installation;
Widely applicable, no dirt accumulation issues, suitable for multi-fluid media;
High measurement accuracy, precision 1.5%;
Low pressure loss, no moving parts, high reliability;
Capable of measuring various media such as gases and liquids.

Technical Parameters

Item	Specification
Housing Material	304 Stainless Steel
Measuring Range	Liquid: 100–3000 L/h; Gas: 0.8–30 m³/h
Nominal Diameter	DN8 / DN12 / DN15
Accuracy	±1.5%
Repeatability	±0.5%
Response Time	< 100 ms
Ambient Temperature	-20 to +55°C
Maximum Working Pressure	1.6 MPa
Medium Temperature	-10 to +80°C
Output Signal	4–20 mA, RS485
Display (LCD)	Instantaneous flow, totalized flow, standard flow velocity, current output value, etc.
Connection Type	G thread
Applicable Gases	All gases except acetylene can be measured
Connection Type	1/2 NPT male thread

Flow Range

Nominal Diameter DN (mm)	DN8	DN12	DN15
Liquid (L/h)	100–1000	200–2000	300–3000
Gas (m³/h)	0.8–8	2–20	3–30

Vortex Shedding Flow Meter Measurement Principle

A vortex flow meter consists of a vortex generator, a frequency detector, and a signal converter, outputting a 4-20mA DC signal or a pulse voltage signal. Its working principle involves placing a vortex generator in the fluid, alternately generating regular vortices from both sides of the generator; this type of vortex is called a Karman vortex street.

There is a stable mathematical relationship between the vortex shedding frequency and the fluid flow velocity:

f = St × V / d

Where:
f — vortex shedding frequency
St — Strouhal number
V — average fluid velocity
d — characteristic width of the vortex-generating body

Since the vortex frequency is proportional to the fluid flow velocity, the volumetric flow rate of the fluid can be calculated by detecting the vortex frequency.

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**SI-3304 Insertion Type Vortex Flow Meter**

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The Compact Vortex Shedding Flow Meter features a simple structure, high accuracy, and ease of installation, maintenance, and use. It enables real-time monitoring of liquid or gas flow rate and temperature in pipelines. It supports flow and temperature (4~20) mA signals or RS-485 communication and alarm switch outputs.

Sino-Inst’s Compact Vortex Shedding Flow Meters are widely used in industries such as petrochemicals, power generation, metallurgy, steel mills, papermaking, food processing, water treatment, and battery manufacturing. If you require gas or liquid flow measurement, please feel free to contact our application engineers!