SILVER AUTOMATION INSTRUMENTS LTD.

Vortex Flow Meter

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Main Features:
  • STLU Intelligent Vortex Flow Transducer ispiezocrystalbuilt inbluff bodyto 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, Silver 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 highsignal noiseratio 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 2×10~ 7× 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 Parameters :

Vortex Flow meter Main Technical Parameters

Fluids

Gas, steam

Liquid

Accuracy

±1.5%

±1.0%

Repeatability

±0.5%

±0.33%

ReynoldsNumber

2×104~7×106

Media Temp.

Standard

-40°C~+350°C

Extension

-40°C~+250°C

Turn Down Ratio

10:1

Size

DN25~DN500

Pressure

1.6Mpa/2.5Mpa/4.0Mpa and others

Velocity

5m/s ~70m/s

0.5 m/s~7m/s

Wet Parts Material

304 SST/316 SST

FlangeMaterial

Carbon steel/304 SST/316 SST

Bolt Material

Carbon steel/304 SST

Detector Material

316 SST

ConnectingRod

304 SST

Radiator

Aluminum alloy

Mounting

Wafer/Flange

Protection Level

IP65 /IP67/IP68

Power supply

24VDC(18VDC~30VDC)/Battery

Signal Output

(4-20)mA/ pulse

Communication

Hart/Modbus

Electrical connection

2-M20×1.5

Explosive Proof

Exd IIBT4/Exia IICT3-T6

Construction

Compact/Remote

Environment Temp.

With LCD:-10 ~60°C/ Without LCD: -20 ~60°C

RelativeHumidity

5% ~90%



Model Selection

Mark


STLU

Silver Automation Instruments Vortex Flow meter

Code

Working Principle

VFN

Intelligent Karman Vortices Flowmeter

Code

Installing Type

1

Flanged(DN50~DN300)

2

Wafer type (DN15~DN300)

3

Fixed Inserted

4

Adjustable Inserted (without Ball Valve)

5

Adjustable Inserted (with Ball Valve)

Code

Measured Fluid

2

Liquid

3

Gas

4

Steam

Code

Nominal Diameter

015

15mm

05

50mm

15

150mm

020

20mm

06

65mm

20

200mm

02

25mm

08

80mm

25

250mm

03

32mm

10

100mm

30

300mm

04

40mm

12

125mm

Others

Inserted≥250mm

Code

Indicator

D

With Digital Indicator

N

No Indicator

Code

Power Supply

1

24V DC

2

3.6V Lithium Battery

Code

Output Signal

0

No output

1

Pulse Output

2

Two Wire :4~20mA DC

3

RS-485 (manufacture-defined protocol)

4

Hart Protocol

5

RS-485 (Modbus)

Code

Fluid Temperature

1

Standard -40~250°C(-40~120°C for inserted)

3

High Temperature Type :+100~+350°C

Code

Rated Pressure

Code

Standard

Code

Standard

Code

Standard

G1

GB 1.6Mpa

D1

DIN PN16

A1

ANSI Class 150

G2

GB 2.5 Mpa

D2

DIN PN25

A2

ANSI Class 300

G3

GB 4.0 Mpa

D3

DIN PN40

A3

ANSI Class 600

S

Special (specify when order)

Code

Explosion Proof

N

Non

d

Flameproof

i

Intrinsically Safe

Code

Flow Meter Construction

0

Compact display

1

Remote Display (standard 5 m cable)

Code

Protection Level

0

IP65

1

IP67

2

IP68


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