High Measurement Accuracy High Reliability 20mA Vortex Flowmeter
Vortex flowmeter is based on the Carmen vortex principle research
and production, mainly for industrial pipeline fluid flow
measurement, such as gas, liquid, steam and other media. Its
characteristics are small pressure loss, a large range, high
accuracy, in measuring the volume flow of working conditions almost
independent of fluid density, pressure, temperature, viscosity and
other parameters. No movable mechanical parts, so high reliability
and low maintenance. Instrument parameters can be stable over time.
Vortex flow meter adopts piezoelectric stress sensor, which is
highly reliable and can work in the operating temperature range of
-20℃～+250℃. It has analog standard signal and digital pulse signal
output, so it is easy to be used with digital system such as
computer, which is an advanced and ideal measuring instrument.
Vortex Flowmeter Working Principle
Vortex flowmeter is designed in the flow field of the vortex
generator, detection probe and the corresponding electronic
circuitry and other components. When the fluid flows through the
vortex generator, it forms two alternating rows of vortices on both
sides, this vortex is known as Carmen vortex street. Strohal, based
on the theory of Carmen vortex street, proposed that the frequency
of Carmen vortex street is proportional to the fluid flow velocity,
and gave the relationship between frequency and flow velocity: f =
St × V / d
f: vortex frequency (Hz)
v: the average flow velocity on both sides of the vortex generator
(m/s )
St: Strohal coefficient (constant)
These alternating vortices form a series of alternating negative
pressure, which acts on the detection probe and generates a series
of alternating electrical signals, which are converted, shaped and
amplified by the preamplifier, and then output a pulse frequency
signal or standard signal proportional to the vortex
synchronization.
Vortex Flowmeter Technical Parameters
| Power supply | 12~24VDC |
| Nominal pressure | 1.6MPa, 2.5MPa, 4.0MPa and above |
| Accuracy grade | 1.0, 1.5 |
| Media temperature | -40~350℃ |
| Pressure loss | Resistance coefficient cd≤2.4 |
| Output Signal | Voltage pulse low level ≤ 1V high level ≥ 6V, standard current
signal 4~20mA |
| Explosion-proof grade | Exia II CT6 (optional) |
Vortex Flowmeter Design Feature
1. Easy to install simple structure, no moving wear parts.
2. High measurement accuracy, high reliability, no need for on-site
debugging.
3. Can transmit the flow signal from a long distance, and can be
networked with computer to realize centralized management.
4. The amplifier board adopts unique design and is common for gas
and liquid.
5. There are analog standard signal and digital pulse signal
output, which can be easily used with digital systems such as
computers.
6. Explosion-proof instruments can be used in corresponding
explosion-proof places.
7. Customized design and production according to customer
requirements.
