Vortex Flow meter

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Vortex Flow meter

General Introduction

STLU series smart vortex flow meter is mainly used for measuring flow of industrial pipeline fluid, such as gas, liquid and steam, etc. It has little pressure loss, broad span range and high accuracy. It is not under influence of density, pressure, temperature and viscosity when measuring volumetric flow. It has no movable mechanical parts with high reliability and little maintenance.

Main Features:

  • Best of STLU Intelligent Vortex Flow Transducer is piezocrystal built in bluff body to avoid fluid turbulence caused by external type, no zero drift, and high reliability.    
  • By lots of wave analysis of vortex flow transducer for a long time, Shanghai Kent has designed the most scientific probe shape, wall thickness, height, probe rod diameter and matching piezocrystal, adopts advanced CNC to machine to ensure technical parameters of proper alignment and smooth finish etc., and with special treating process to maximatily overcome existed signal influence by intrinsic self-oscillation frequency.  
  • STLU Intelligent Vortex Flow Transducer has good commonality and interchangeability. Adopt advanced CNC to machine parts such as transducer body and bluff body etc. to ensure machining accuracy to make parts (especial for bluff body) has good commonality, so that, repeatability and accuracy won¡¯t be affected by parts change and get signal with high signal noise ratio and good stability. 
  • Simple & fixed structure, no moving parts, high reliability, convenient maintenance.
  • Wide measuring range, turndown ratio can reach 10:1 in Reynolds Number 2¡Á10~ 7¡Á 10. 4 6
  • Detecting element not contact with the measured fluids directly, stable performance and long service life. 
  • Detecting probe and bluff body installed independently, and high temperature resistance piezocrystal sealed in bluff body make transducer simple structure, good commonality and high stability.
  • Output pulse signal and current signal directly proportional to flowrate, and have RS-485, Hart, ModBus communication for convenient computer networking. 
  • When vortex flow transducer measures liquid volumetric flow, it does not need temperature, pressure compensation. Vortex output signal is linear to velocity, that is to say, directly proportional to volumetric flowrate. When measure gas or steam, it needs temperature and pressure compensation. Compensating pressure and temperature is to get volumetric flow of gas under standard state or mass flow of steam. 
  • Low pressure loss, just 1/4 ~ 1/2 of orifice plate. 
  • In a specific range of Reynolds Number, flow character just refers to bluff body shape and dimension, and not affected by fluid pressure, temperature, viscosity, density and ingredients. 
  • Wide application, can measure flowrate of steam, gas, liquid etc

Technical Parameter Table

Installation Type

Measured Fluid



Pipe Type

Gas (incl.steam)

±1.5 %




Inserted Type







Measuring Range

Gas (incl.steam): 7~55 m/s (7~50 m/s for DN≥200)

Liquid:0.7~5.5 m/s

Rated Pressure

GB 1.6Mpa,2.5Mpa,4.0Mpa,6.4Mpa

DIN PN16,PN25,PN40

JIS 10K,20K,40K

ANSI Class 150,Class 300, Class 600

Fluid Temperature

-40~+250℃(-40~+120℃ for inserted)

+100~+350 ℃ (high temp)

Installation Type

Pipe Vortex Flow Transducer


Parts Name


Transducer Body

304 SS

Bluff Body


Detecting Probe

Connecting Rod






High Temperature Resistance Asbestos



Power Suply

24V DC

3.6V Lithium Battery (Local display)

Double Power Supply (24VDC,3.6V Lithium Battery)

Output Signal

Pulse, 4~20mA, RS-485,Hart,Modbus

Electric Terminal


Protection Grade

Flameproof Exd II BT3-6

Insteinsical Safe Exia II CT3-6

Body Process

SS Sand-blast for Transducer Body

And Plastic Coating for Amplifier Cover



-35~60℃ (No LCD)

-5~60 ℃ (with LCD)

Relative Humidity