Intelligent vortex flowmeter is a kind of flow meter which uses piezoelectric crystal as detecting element and outputs the standard signal proportional to the flow rate. The instrument can be used directly with the intelligent flow integrator, can also be used with the computer and distributed system to measure the flow parameters of different media. The meter is based on the detection principle of the fluid vortex street, the piezoelectric crystal of the vortex street detection does not contact with the medium, the meter has the characteristics of simple structure, good versatility and high stability, intelligent vortex flowmeter can be used for various gas, liquid and steam flow detection and measurement.

Working principle:

Intelligent vortex flowmeter is the basic principle of principle of karman vortex street,  namely "vortex frequency of vortex separation is proportional to the velocity".

The flow body diameter of the flowmeter is basically the same as the nominal diameter of the instrument. As shown in figure a,  circulation this insert in the body has an approximate isosceles triangle cylinder, cylinder to the axis of the measured medium flow direction and vertical, bottom, face to the fluid, when through the measured medium cylinder, alternately on each side of cylinder spiral, spiral continuously produce and separation,  formed downstream of the cylinder in staggered vortex of two columns, namely "vortex street". Theory analysis and experiment have shown that  separation vortex frequency is proportional to the column side of medium velocity.

f=(sr*V)/d

Where:

f -- frequency of cylinder side vortex separation (Hz);

V─ column side velocity (m/s);

d -- width of the column facing surface (m);

Sr -- Strauhal number. Is a constant that depends on the profile of the cylinder and is largely independent of the fluid properties and velocity.

Product features:

Sensor measuring probe adopts special process package, high temperature resistance up to 350℃

The sensitive element is sealed in the probe body, the detection element does not contact the measuring medium, and the service life is long

The sensor adopts compensation design to improve the earthquake resistance of the instrument

Simple structure, no moving parts, high durability

In the specified Reynolds number range, the measurement is not affected by the medium temperature, pressure, viscosity

Flowmeter can be used in explosion-proof occasions, good safety

The measuring range is wider than 10:1, 15:1

Strong versatility, can measure unclean gas, liquid

Four technical parameters

Ambient temperature: (-40 ~ 55)℃;

Relative humidity: (5 ~ 90)%;

Atmospheric pressure: (86 -- 106)Kpa

Nominal diameter: (15 ~ 1500)mm (larger than 200mm for insertion structure);

Measuring medium: liquid, gas, steam;

Nominal pressure: 1.6Mpa 2.5Mpa 4.0Mpa

Medium temperature: (-40 ~ +350)℃;

Accuracy level: 0.5,1.0, 1.5,2.5;

Linearity: ≤± 1.5%;

Repeatability: ≤ 0.5%,≤1.0%;

Output signal: voltage pulse;

(4 ~ 20)mA DC (two-wire system);

Power supply: voltage pulse 12V DC or 24V DC;

Current type 24V DC

Intelligent current type 24V DC

Smart battery type 3.6V DC

Load resistance: The load resistance does not exceed 350Ω.

Body material: 304 stainless steel

Connection mode: (15 ~ 300)mm flange clamping structure or flange joint structure;

(200 ~ 1500)mm is insert type structure;

Protection level: IP65, IP67;

Cable port: PG10

Explosion-proof type: safety type; Flameproof type

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