Magnetic Vortex Flow Meter - KFL-CD-20L-25MPa

1. Profile
KFL-CD Series Electromagnetic Vortex Flowmeter is the new generation of flowmeter using
electromagnetic digital signal as inspection measure. The flowmeter is aseismatic, high sensitive
and low cost. It can be widely used in oil, chemical, metallurgy,brewage,printing, dyeing and
medical industry as well as environmental protection in food manufacturing and city drain system
to measure flow statistic.

Specialty

· Two electricity supply channels: internal 3V -3.6V Li Battery or 24V DC external or use
both channels at the same time;

· All in one design with multi functionality, real time data appearance, very convenient for
our customers, easy data adjustment;

· Full scale of data output function: standard two-wire current output with 4-20mA, pulse
output or RS-485 communication;

· Well aseismatic and anti-jamming ability;

· Stainless steel, anti-cauterization, no internal movable parts, long lasting using period.

· Wide range and precise flow measurement.

2. Operating Principle

The flowmeter is designed based on the electromagnetic induction theory and Karman vortex
theory. When a column object placed in flowing fluids in pipe, a series of vortices will be generated
alternately on each side of the object as show as below, this eddies be known as Karman
Vortices Street, the frequency of the vortex shedding is related to the velocity of the fluid and the
width of the object . Expressed by formula as below:
f=St .v/d
Where f----frequency of Karman Vortex shedding
St----Strouhal number
v----velocity
d----width of column object

Because the frequency of the vortex shedding is proportional to the velocity, it can be
used to calculate the transient flow rate .Strouhal number is very important coefficient in the Vortex Flowmeter. when nearly the St≈0.17 in the range of plane and straight line in curve, frequency of vortex shedding is proportional to the velocity, so as long as the frequency (f) be check out, the velocity (v) will be obtained, and volumetric flowrate will be got according to v.

3. Technical Specifications

Using Conditions
a) Working temperature: -30+60;
b) Relative humidity: ≤85%;
c) Atmospheric pressure: 86kPa106kPa;
d) fluid conductance: ≥5μS/cm;
e) Applicable fluid: water, oiliness sewage, acid and alkali liquid;
f) Applicable fludi temperature: -20+120.

Technical Parameter:
a) Accuracy: 1st class;
b) range ratio: 20:1, 25:1;
c) PN (Mpa): 1, 1.6, 2.5, 4, 16, 25, 32, 42;
d) Working voltage: 2.7V3.6V DC (lithium battery supply), +18V+36V DC(power
supply);
e) Signal output (with power supply)
-Standard two-wire signal output: 420mA,
-Pulse signal export;
-RS-485 communication.