that uses a piezoelectric crystal as a detection element and outputs a standard signal proportional to the flow rate. The meter can be used directly with the intelligent flow totalizer, or it can be used with computers and distribution systems to measure the flow parameters of different media. The instrument is based on the detection principle of fluid vortex street. The piezoelectric crystal of the vortex street is not in contact with the medium. The meter has the characteristics of simple structure, good versatility and high stability. The intelligent vortex flowmeter can be used for various gases and liquids. And steam flow detection and measurement.
The basic principle of the intelligent vortex flowmeter is the Carmen vortex principle, that is, "the vortex separation frequency is proportional to the flow velocity".
The diameter of the flow meter body is basically the same as the nominal diameter of the meter. As shown in Figure 1, a circular cylinder is inserted into the circulation body. The axis of the cylinder is perpendicular to the flow direction of the measured medium, and the bottom surface faces the fluid. When the measured medium flows through the column, Vortexes are alternately generated on both sides of the body, and vortices are constantly generated and separated. Two staggered rows of vortices are formed downstream of the column, that is, "vortex street". Theoretical analysis and experiments have shown that the frequency of vortex separation is directly proportional to the velocity of the column-side medium.
Sr-Strauhal number. It is a constant that depends on the shape of the cross section of the cylinder and has nothing to do with the properties of the fluid and the velocity of the flow.
The sensor measuring probe is packaged in a special process, which can withstand high temperature up to 350 ℃
The sensitive element is sealed in the probe body, and the detecting element does not contact the measuring medium, and the service life is long.
The sensor adopts compensation design to improve the shock resistance of the instrument
Simple structure, no moving parts, high durability
Within the specified Reynolds number range, the measurement is not affected by the temperature, pressure and viscosity of the medium
Flowmeter can be used in explosion-proof occasions with good safety
Wide range ratio, up to 10: 1 15: 1
Strong versatility, can measure unclean gas and liquid
Four technical parameters
Ambient temperature: (-40 ～ 55) ℃;
Relative humidity: (5 ～ 90)%;
Atmospheric pressure: (86—106) Kpa
Nominal diameter: (15 ～ 1500) mm (greater than 200mm is plug-in structure);
Measurement medium: liquid, gas, vapor;
Nominal pressure: 1.6Mpa 2.5Mpa 4.0Mpa
Medium temperature: (-40 ～ + 350) ℃;
Accuracy level: 0.5 level, 1.0 level, 1.5 level, 2.5 level;
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;
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 method: (15 ～ 300) mm flange-mounted structure or flange connection structure;
(200 ～ 1500) mm is a plug-in structure;
Protection level: IP65, IP67;
Cable interface: PG10
Explosion-proof type: intrinsically safe type; flameproof type
Explosion-proof mark: iaⅡCT6; dIIBT4