Product overview
Lugb-v vortex flowmeter is composed of vortex generator, detection probe and corresponding electronic circuit. When the fluid flows through the vortex generator, two alternate rows of vortices are formed on both sides of the vortex generator, which is called Karman vortex street. On the basis of Karman vortex street theory, Strouhal proposed that the frequency of Karman vortex street is directly proportional to the flow velocity of fluid, and gave the relationship between frequency and flow velocity: < br / >
　　　　　　　 f=St× V/d

Where: < br / >
F vortex street frequency < br / > 0
The average velocity (M / s) on both sides of V vortex generator is < br / > 0
St steharol coefficient (constant) < br / >
These alternating vortices form a series of alternating negative pressure, which acts on the detection probe to form a series of alternating electrical signals. After being converted, shaped and amplified by the preamplifier, the pulse frequency signal (or standard signal) in direct proportion to the vortex synchronization is output.
 
Product features
ASIC large scale integrated circuit, small size;
The system has high integration, high reliability and low power consumption;
Low DC input bias & le; 50uv, temperature drift & lt; 1uV/° C ;
The programmable filter can effectively remove the non periodic vibration interference;
Intelligent control is realized without manual debugging;
 
technical parameter
Executive Standard & nbsp;
  Vortex flowmeter (jjg1029-2007)
Gauge diameter (mm) & nbsp;
  15、20、25、32、40、50、65、80、100、125、150、200、250、300
Nominal pressure (MPA) & nbsp;
  1.6Mpa, 2.5MPa, 4.0Mpa (others can be customized)
Accuracy level & nbsp;
  Gas or steam: & plusmn; 1.5%、± 1%
Range ratio & nbsp;
  1:10； 1:15； 1:20
Sensor material & nbsp;
  304 stainless steel, 316 (L) stainless steel, etc
Conditions of use & nbsp;
  Medium temperature: - 40 ℃ ~ + 250 ℃, - 40 ℃ ~ + 320 ℃ & nbsp< br />
  Ambient temperature: - 20 ℃ ~ + 60 ℃ & nbsp< br />
  Relative humidity: 5% - 95% < br / >
  Atmospheric pressure: 86kpa ～ 106kpa
Signal output function & nbsp;
  Pulse signal, 4 ~ 20mA signal
Communication output function & nbsp;
  RS485 communication output, HART protocol, etc
Working power supply & nbsp;
  External power supply: 34vdc & plusmn; 15%, Ripple & le& plusmn; 5%, suitable for 4 ~ 20mA output, pulse output, RS485 communication output, etc
Signal line interface & nbsp;
  Basic type: Hausman connector or self-contained three core cable; Explosion proof type: internal thread M20 & times; one point five
Explosion proof grade & nbsp;
  ExdIIBT6
Protection level & nbsp;
  IP65 or higher (customizable)
 
measuring range
Gas measurement range
Gauge diameter & nbsp< br />
（mm）
V-shaped measurement range & nbsp< br />
（m3/h）
DN15
5-30（6:1）
DN20
6-60（10:1）
DN25
7-70（10:1）
DN32
8-160（20:1）
DN40
18-360（20:1）
DN50
25-500（20:1）
DN65
40-800（20:1）
DN80
50-1000（20:1）
DN100
80-1600（20:1）
DN125
150-3000（20:1）
DN150
180-3600（20:1）
DN200
350-7000（20:1）
 
The measurement range of saturated steam flow takes steam pressure 1.0MPa as an example
Gauge diameter & nbsp< br />
（mm）
V-shaped measurement range & nbsp< br />
（kg/h）
DN15
25.8-154.8（6:1）
DN20
30.96-309.6（10:1）
DN25
36.12-361.2（10:1）
DN32
41.28-825.6（20:1）
DN40
ninety-two.88-1857.6（20:1）
DN50
129-2580（20:1）
DN65
206.4-4128（20:1）
DN80
258-5160（20:1）
DN100
412.8-8256（20:1）
DN125
774-15480（20:1）
DN150
nine hundred and twenty-eight.8-18576（20:1）
DN200
1806-36120（20:1）
 
On site cases