1.Working Principle:
The vortex flowmeter operates on the basis of Karman vortex street principle. If put a vertical cylinder in flow fluid,during the range of Reynolds number will alternate to form a regular vertex behind the cylinder two sides,named as Karman vortex street.The direction of vortex street is inward,up will form a clockwise rotation,down will form a counter-clockwise rotation,the frequency in single side in proportion to flowrate, in inverse proportion to the diameter of vortex producer,the relationship of them as following:
f=St×v/d
In the formula:St-Jack straw Hal number;f-frequency product by single side vortex;v-flowrate;d-diameter.
Instrument parameters K: a ratio of separation pulse amount of vortex to the volume amount:
K=N/V
In the formula:
K-instrument coefficient (pulse 1/m3)
N-pulse number (time)
V-volume amount
The relationship between the vortex separation frequency and liquid flow is as follows:
f=K×Q
In the formula:
f-frequency (time)
Q-flow (m3/h)
By testing the vortex separation frequency, the liquid flow in the pipe can be measured.
2.Type Selection:
Model |
Instruction |
||||||||||
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
||
|
|
|
|
|
|
|
|
Karman Vortex Street |
|||
LUG |
|
|
|
|
|
|
|
Stress Type Testing |
|||
Measuring Ways |
1 |
|
|
|
|
|
Flange connection(GB9119-2000) |
||||
2 |
|
|
|
|
|
Clamp flange(equip with flange and bolts in factory) |
|||||
Medium |
1 |
|
|
|
|
Both for gas and liquid |
|||||
2 |
|
|
|
|
Liquid |
||||||
3 |
|
|
|
|
Gas |
||||||
4 |
|
|
|
|
Steam |
||||||
Diameter |
02 |
|
|
|
DN25 |
||||||
04 |
|
|
|
DN40 |
|||||||
05 |
|
|
|
DN50 |
|||||||
08 |
|
|
|
DN80 |
|||||||
10 |
|
|
|
DN100 |
|||||||
15 |
|
|
|
DN150 |
|||||||
20 |
|
|
|
DN200 |
|||||||
25 |
|
|
|
DN250 |
|||||||
30 |
|
|
|
DN300 |
|||||||
Operation Condition |
Blank |
|
|
Normal Type |
|||||||
B |
|
|
Intrinsic safety,iaIICT6 |
||||||||
Signal Output |
P |
|
Voltage pulse, 24V power |
Hand operator and digital control meter is optional |
|||||||
S |
|
Pulse,4~20mA, on-site,24V power |
Optional Input ports:HART,temp.(PT100),pressure sensor,pressure transmitter |
||||||||
D |
|
On-site,without any display,lithium battery |
Without any input ports |
||||||||
Structure |
F |
Separated Type |
|||||||||
Z |
Integrated Type |