Description
JC-080 series smart vortex flowmeter is mainly used for measuring the flow of industrial pipeline fluid, such as gas, liquid, and steam, etc. It has little pressure loss, broad span range, and high accuracy. It is not under influence of density, pressure, temperature, and viscosity when measuring volumetric flow. It has no movable mechanical parts with high reliability and little maintenance.
OPERATION PRINCIPLES
Setting vortex generation body (bluff body) in fluid, regular vortex will alternately generate from two sides of the vortex generation body. This kind of vortex is called Karman vortex. See picture 1. Vortex is at downstream of the vortex generation body, unsymmetrical array. Set occurrence to be f , average flow speed of measured medium U, face width d, and diameter D. According to Karman principle, exciting following relation :
f = StU1/d = StU/md
U1 – average flow speed at two sides of vortex generation body, m/s
St – Strouhal number
m – the ratio of segment area and pipeline cross-sectional area
Instantaneous volumetric flow :
In the formula K — Instrument Coefficient, pulse number/m3 (P/m3)
K has a relation with the vortex generation body, pipeline dimension and Strouhal number. Strouhal number is a parameter without dimension. It has something to do with the shape of the vortex generation body and Reynolds number. Seeing from the picture, in the range of Re = 2 * 104 ~ 7 * 106, St can be seen to be a constant. When measuring gas flow, the flow calculation formula of JC-080 is
Diagram 2 Relation Curve of Strouhal number and Reynolds number
In the formula, Qvn, Q — volumetric flow under standard conditions and working conditions, m3/h
Pn, P — absolute pressure under standard conditions and working conditions, Pa.
Tn, T — thermodynamics temperature under standard conditions and working conditions, K
Zn, Z — gas compression coefficient under standard conditions and working conditions
Seeing from the above formula, pulse frequency signal output by JC-080 is not influenced by fluid physical properties and component changes, that is, the instrument coefficient only has relation with the vortex generation body and the dimension of the pipeline in a certain range of Reynolds number. But the flowmeter must measure mass flow in material balance and energy measurement, here the output signal of the flowmeter should monitor volumetric flow and fluid density, therefore, fluid physical properties and components have a direct influence on flow measurement.
MODEL SELCETION
| Code | Nominal Diameter (mm) | Flow Range (m3/h) | Remarks | |||
| JC-080-25
JC-080-32 JC-080-40 JC-080-50 JC-080-65 JC-080-80 JC-080-100 JC-080-125 JC-080-150 JC-080-200 JC-080-250 JC-080-300 |
DN25
DN32 DN40 DN50 DN65 DN80 DN100 DN125 DN150 DN200 DN250 DN300 |
1.4~12(L) 8.8~124(G) 7-124(S)
2.0~20(L) 15~200(G) 12-200(S) 3.2~36(L) 23~300(G) 18-300(S) 5~56(L) 35~450(G) 28-450(S) 8.2~96(L) 63~820(G) 50-820(S) 12.5-145(L) 90~1200(G) 75-1200(S) 20~224 142~1950 120-1950 30~352 220~3000 175-3000 44~512 320~4400 260-4400 79~920 565~7800 440-7800 140-1200 850-12400 720-12400 175-2020 1250-17500 1020-17500 |
1. Make reference to sheet 3 for steam flow range
2. DN250 ~ DN600 can be provided according to customers’ requirements 3. For DN300 and above, we recommend Insertion Type Vortex Flowmeter 4. L is liquid ,G is gas , S is steam
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| Code | Function 1 | |||||
| N
Y |
No Temperature & Pressure compensation
Temperature & Pressure compensation provided |
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| Code | Output Code Output | |||||
| F1
F3 |
4 ~ 20 mA (two wires) F2 4-20ma (three wires)
RS 485 interface F4 Pulse/Frequency |
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| Code | Medium Code Medium | |||||
| J1
J2 |
Liquid J3 Steam
Gas |
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| Code | Connection | |||||
| L1
L2 |
Wafer Type
Flange Connection Type |
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| Code | Function 2 | |||||
| E1
E2 T1 T2 T3 P1 P2 P3 P0 D1 D2 I R |
1.0
1.5 Normal temperature High Temperature Steam 1.6 MPa 2.5 MPa 4.0 MPa Special pressure Internal 3.6 V 24V DC Integral type Remote type (10M cable ) |
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| JC-080-25 Y F1 J1 L1 E1T1P1D2 I |
| Explaination :
Size：DN25 Y： Temperature & Pressure compensation provided F1 :4 ~ 20 mA (two wires) for output J1: Medium is Liquid L1: Wafer Type E1: 1.0 for accuracy T1: Normal temperature P1:1.6 MPa D2:24V DC I: Integral type |
Attention : Vortex Flowmeter can’t apply in the site with vibration .
