Vortex Flow Meter (HGVF) with Pressure Compensation

HGVF series smart vortex flowmeter 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 viscocity when measuring volumetric flow. It has no movable mechanical parts with high reliability and little maintenance.

OPERATION PRINCIPLES
Setting vortex generation body (bluff body) in fluid, regular vortexs will alternately generate from two sides of vortex generation body. This kind of vortex is called Karman vortex. See picture 1. Vortex is at downstream of vortex generation body, unsymmetrical array. Set occurrence to be f, avarage flow speed of measured medium U, face width d and diameter D. According to Karman principle, exsiting following relation:
F = StU1/d = StU/md
U1 - avarage flow speed at two sides of vortex generation body, m/s
St - Strouhal number
M Ratio of segment area and pipeline cross sectional area

 3.1 Low power consumption CPU processor, LCD display
3.2 Installation & maintenance convenient, verification cycle about 2 years
3.3 Simple structure, no moving parts, long-term reliably
3.4 Range ability: 1:10, Turndown ratio 1:10
3.5 Low pressure loss, low operation cost, energy saving
3.6 Within certain range of Reynolds number, the output signal is not affected by the fluid's changes in composition and physical properties. Instrument's coefficient only relates to the vortex occurred body's shape and size. Generally, it is not necessary to calibrate the instrument coefficient after replacing accessories.
3.7 Both local display and long distance transmission to computer in control room available.
3.8 Detecting component not directly contacting the measured medium, so instrument performance is stable.
3.9 Built-in temperature & pressure compensation, current output photoelectric isolated, thus a good ability to suppress common mode disturbance.

 4.1 Medium temperature: -25ºC~+350ºC
4.2 Mounting style: Wafer or flange type for DN15~DN300, Insertion type for DN300~DN1000
4.3 Flow velocity:  Steam: <4~70m/s,   Liquid: 0.7~7m/s,  Gas: 5~70m/s
4.4 Pressure rating: PN16, PN25, PN40, higher pressure available on request
4.5 Pressure loss coefficient: Cd ≤2.6
4.6 Accuracy:  0.5%, 1.0%, 1.5% for Wafer type and Flange type,   1.5%, 2.5% for Insertion type
4.7 Power supply:  DC12V or DC24V for flow sensor, DC24V for transmitter
DC24V, DC12V or 3.6V lithium battery for local display type
4.8 Signal output:  Frequency 1~2600Hz for sensor , Low level ≤1V, High level ≥5V
4-20mA (2-wire) for transmitter
4.9 Seismic performance: Piezo-electric crystal probe ≤0.2g, Differential capacitance probe ≤2.0g
4.10 Ambient temperature: -30ºC~+65ºC
-10ºC~+50ºC for transmitter local indicating
4.11 Ambient humidity: 5~85%RH
4.12 Output signal transmitting distance: ≤500m
4.13 Straight pipe requirement:  Upstream ≥10D,  Downstream ≥5D
4.14 Ex-protection: Intrinsically safe explosion-proof: Exia II CT2 - T5
4.15 Weather proof: IP65 for ordinary type, IP68 for submerged type
4.16 Transmitter casing material: aluminum alloy
     Body material: SS304, other material on customer request