Vortex flowmeters are mainly used for flow measurement of
industrial pipeline fluids, such as gas, liquid, vapor and other
media. It is characterized by small pressure loss, large measuring
range, and high accuracy. It is hardly affected by fluid density,
pressure, temperature, viscosity and other parameters when
measuring volume flow under working conditions. There are no
movable mechanical parts, so the reliability is high and the
maintenance is small. The instrument parameters can be stable for a
long time.  Using piezoelectric stress sensor, high reliability,
can work in the working temperature range of -20℃～+250℃. It has
analog standard signal and digital pulse signal output. It is easy
to use with computer and other digital systems. It is a relatively
advanced and ideal flow meter.
|Nominal Confucianism||15/20/25/32/40/50/65/ 80/100/125/150/200/250/300 (300-1000) plug-in|
|Nominal pressure||DN15-DN200 4.0 (>4.0 protocol supply), DN250-DN3001.6 (>1.6
|Medium temperature °C||Piezoelectric: -40~150, -40~260, -40~350;|
|Accuracy||±1%R, ±1.5%R; plug-in: ±2.5%R|
|Supply voltage||Sensor: DC12V, DC24V; Transmitter: DC24V; Battery powered type:
|Output signal||Square wave pulse (not including battery-powered type): high level
≥5V, low level ≤1V; current: 4-20mA|
|Pressure loss coefficient||Comply with JB/T9249 standard Cd≤24|
|Explosion-proof mark||Intrinsically safe type: Exd II iaCT2-T5 Flameproof type: Exd II
|Protection level||Ordinary type IP65 diving type IP68|
|Environmental conditions||Temperature 20°C~55C, relative humidity 5%~90%, atmospheric
|Applicable medium||Gas, liquid, steam|
|Transmission distance||Three-wire pulse output type: ≤300m, two-wire standard current
output type (4~20mA) ≤1500m: load resistance ≤750Q;
1. The temperature and pressure compensation function is integrated
in the meter body at the same time, which can measure the standard
volume flow or standard mass flow of the fluid.
2. Fully intelligent and digital circuit design, which can
automatically compensate the density of the measured fluid or
volume calculation under standard conditions.
3. The new digital filtering and correction functions make the flow
measurement more accurate and reliable.
4. The battery-powered type can work continuously for more than two
years without external power supply.
5. Brand new dot matrix LCD display of Chinese characters, which is
more convenient to use and operate.
If a triangular cylindrical vortex generator is installed in the
fluid, regular vortices are alternately generated from both sides
of the vortex generator. This type of vortex is called the Karman
vortex. As shown in the figure on the right, the vortex array is
arranged asymmetrically downstream of the vortex generator...
The vortex flowmeter is composed of a vortex generator designed in
the flow field, a detection probe, and corresponding electronic
circuits. When the fluid flows through the vortex generator, two
alternating rows of vortices are formed on both sides of it. This
vortex is called the Karman vortex street. On the basis of the
Karman vortex street theory, Strohar proposed that the frequency of
the Karman vortex street is proportional to the flow velocity of
the fluid, and gave the relationship between the frequency and the
f = St × V/d
Where: f vortex street frequency (Hz)
The average flow velocity on both sides of the V vortex generator
St Strohal coefficient (constant)
These alternating vortices form a series of alternating negative
pressures. The pressure acts on the detection probe to generate a
series of alternating electrical signals. After conversion,
shaping, and amplification by the preamplifier, the output is
synchronized with the vortex. Proportional pulse frequency signal
or standard signal.