?? The SKLU series steam vortex street flowmeter mainly uses in the industry pipeline the steam medium fluid flow measurement, the steam vortex street flowmeter characteristic is the pressure loss is small, the measuring range scope is big, the precision is high, when survey operating mode rate of volume flow nearly not parameter and so on fluid density, pressure, temperature, viscosity influences. Not movable machine parts, therefore the reliability is high, maintains the quantity to be small. The measuring appliance parameter can the long-term stability. The steam vortex street flowmeter uses the piezoelectricity stress type sensor, the reliability is high, may in - 20℃~+250℃ the operating temperature scope works. Has the mock standard signal, also has the digital pulse signal output, easy and number system necessary uses and so on computer, is one kind quite advanced, the ideal flow instrument.
First, principle of work
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Establishes the trihedral prism columnar order whirlpool in the steam fluid to have the body, has the body both sides from the whirlpool to produce alternately has the rule whirlpool, this kind of whirlpool is called the Carmen whirlpool, if the figure to the right shows, turns on lathe the vortex street to have the body downstream in the whirlpool to arrange asymmetrically.
Supposes the whirlpool the occurrence frequency is f, was measured that the medium mean velocity of stream is, the whirlpool has the body to welcome the flow surface width is d, shows the body latus rectum is D, then obtains the following relationship:
f=SrU1/d=SrU/md (1)
In the formula U1--The whirlpool has the body both sides mean velocity of stream, m/s;
Sr--Strouhal number;
m--Of the whirlpool has ratio of the body both sides arch area and the pipeline cross-section area
In the pipeline rate of volume flow qv is
qv=πD2U/4=πD2mdf/4Sr (2)
K=f/qv= [πD2md/4Sr] - 1 (3)
In the formula K--Flowmeter's scaling factor, the pulse counts /m3 (P/m3).
K besides has the body, pipeline's geometry size with the whirlpool related, but also concerns with the Strouhal number. The Strouhal number is the zero dimension parameter, it has the build shape and the Reynolds number with the whirlpool related, shown in Figure 2 for the circle columnar whirlpool has body's Strouhal number and the pipeline Reynolds number relational graph. The figure shows, in ReD=2×104~7×106 the scope, Sr may regard as the constant, this is the measuring appliance normal work scope. When survey gas flow amount, the VSF current capacity formula is
(4)
Figure 2 Strouhal number and Reynolds number relations curve
In the formula qVn, qV--Respectively is under the standard state (0oC or 20oC,101.325kPa) and under the operating mode rate of volume flow, m3/h;
Pn, P--Respectively is under the standard state and the operating mode absolute pressure, Pa;
Tn, T--Respectively is under the standard state and the operating mode thermodynamic temperature, K;
Zn, Z--Respectively be under standard state under and operating mode gas loading coefficient.
Is obvious by the above equation, the VSF output's pulse frequency signal not the fluid nature and the component change's influence, namely the scaling factor only has in certain Reynolds number scope with the whirlpool the body and pipeline's shape size and so on concerns. But must examine the mass flow as the flowmeter in the mass balance and in the energy measurement, by now flowmeter's output signal should simultaneously monitor the rate of volume flow and the fluid density, the fluid nature and the component has the immediate influence to the flow measurement.
The steam vortex street flowmeter is carries on the solid surrounding boundary rate of fluid flow survey based on the Carmen whirlpool principle the new flowmeter. Because it has the good medium adaptiveness, does not need the temperature pressure compensation then direct measurement steam, the air, the gas, the water, the liquid operating mode rate of volume flow, provides the temperature, the pressure transmitter to be possible the surveyor's beacon situation rate of volume flow and the mass flow, is the throttle type flowmeter's ideal substitution product.
In order to enhance the steam vortex street flowmeter thermostable and the vibration-proof mobility energy, Our company recently developed the SKLUG advanced version vortex street flow sensor, because its unique structure and the selection cause this sensor to be possible in the high temperature (350℃), the strong vibration (≤1g) under the bad operating mode uses.
In the practical application, often the maximum current capacity far is lower than measuring appliance's on limiting value, along with the load change, the minimum current capacity often will be lower than measuring appliance's lower limiting value, the measuring appliance works by no means in its best work section, to solve this problem, usually will use in the survey place reducing enhancement survey place speed of flow, and will select compares small caliber the measuring appliance to favor measuring appliance's survey, but this kind will change the diameter way must has the length between the reducing pipe and the measuring appliance be above the 15D straight length of pipe carries on the rectification, will cause the processing, the installment not to be convenient. Our company develops the longitudinal section shape changes the diameter rectifier for circular arc LGZ, has the rectification, to enhance the speed of flow and the change speed of flow distribution multiple actions, its structure size is small, is only the craft bore of pipe 1/3, makes a body with the vortex street flowmeter, not only does not need seperately to attach section of straight lengths of pipe, but may also reduce to the craft tube straight length of pipe request, the installment is convenient.
??? For the easy to operate, battery power supply's demonstration steam vortex street flowmeter uses the micro power loss high technology and new technology, uses the lithium battery power supply to be possible to move uninterruptedly above for one year, has saved the electric cable and display instrument's purchase fabricating cost, may demonstrate the transient flow, the integrated flux and so on. A temperature compensation build vortex street flowmeter also has the temperature sensor, may the direct measurement saturated steam temperature and calculates the pressure, thus demonstrates the saturated steam the mass flow. Thermobaric compensates a build to have the temperature, the pressure transmitter, uses in the gas flow amount survey being possible the direct measurement gas medium temperature and the pressure, thus demonstration gas sign situation rate of volume flow.
◆ survey medium: Gas, liquid, vapor
◆ the caliber specification flange card installs the type caliber to choose 25,32,50,80,100
◆ the flange connection type caliber chooses 100,150,200
◆ flow measurement scope normal survey speed of flow scope Reynolds number 1.5×104~4×106; Gas 5~50m/s; Liquid 0.5~7m/s
The normal survey current capacity scope liquid, the gas flow amount measuring range see Table 2; The steam flow scope see Table 3
◆ measuring accuracy 1.0 levels of 1.5 levels
◆ is measured the medium temperature: Normal temperature - 25℃~100℃
◆ high temperature - 25℃~150℃ -25℃~250℃
◆ output signal pulse voltage output signal high level 8~10V low level 0.7~1.3V
◆ the pulse dutyfactor approximately 50%, the transmitting range is 100m
◆ pulse current far signalling number 4~20 mA, the transmitting range is 1000m
◆ measuring appliance use ambient temperature: - 25℃~+55℃ humidity: 5~90% RH50℃
◆ material quality stainless steel, aluminum alloy
◆ power source DC24V or lithium battery 3.6V
◆ explosion-proof rank this peaceful iaIIbT3-T6
Protection rank IP65
Intelligent steam vortex street flowmeter product shaping
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Current capacity scope ㎡/h
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The steam current capacity please examine the instruction booklet, the DN300 above recommends the use jack-in type vortex street flowmeter
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Not thermobaric compensates
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Has the thermobaric compensation
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4-20mA output (two-wire system system)
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4-20mA output (three-wire system system)
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RS485 communication connection
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The flange card installs the type
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Internal 3.6V power supply
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Switch engineering data
Power source |
Exchange |
85-265V,45-400Hz |
Cocurrent |
11-40V |
Operates the key and the demonstration |
Presses a key the type |
4 thin film pressed keys may establish choose the complete parameter, may also use the PC machine (RS232) pair of switch hypothesis programming; |
3 line of LCD wide angles of view, the width are warm, belt back light demonstration; |
1st line of demonstration flow rate; |
2nd line of demonstration Flux unit; |
3rd line of demonstration current capacity percentage, to total quantity, reverse total quantity, differential value total quantity, warning, speed of flow. |
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Magnetism key type |
2 magnetism keys use in demonstrating that the parameter the choice and the replacement, use the PC machine (RS232) pair of switch hypothesis programming; |
2 line of LCD wide angles of view, the width are warm, the belt back light demonstrated: |
The 1st line: Magnetism key choice: Demonstrates the current capacity percentage, to the total quantity, the reverse total quantity, the differential value total quantity, the warning, the speed of flow. |
The 2nd line: Demonstrates the current capacity. |
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Internal integrator |
Forward total quantity, reverse total quantity and differential value total quantity. |
Output signal |
Unidirectional analog output |
Entire isolation, load ≤600D. (when 20mA); |
Upper limit: 0-21mA may elect, each grade of lmA; |
Lower limit: 0-21mA may elect, each grade of 1mA; |
Forward and reverse current capacity output mode programming. |
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Bidirectional analog output |
The lower limit limit is. Or 4mA, other with unidirectional analog output. |
Double-sided pulse output |
Two group output distinction correspondence forward and the reverse current capacity, frequency 0~800Hz, upper limit 1-800Hz may elect, each grade of IHz; |
Square-wave or designation pulse width, designation pulse width upper limit 2.5S, each grade of 1ms; |
The passive isolation transistor switched output, may absorb 250mA the electric current, pressure resistance 35V. |
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Two-circuit warning output |
May report to the police (programming) the high/low current capacity, the blank pipe, the malfunction, positive, the reverse current capacity, the simulation quantity ultra measuring range, the pulse quantity ultra measuring range, the pulse small signal excision, the output polarity may elect; |
The belt isolation protection's transistor switched output, may absorb 250mA the electric current, pressure resistance 35V. (and pulse output isolation) |
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Digital communication |
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RS232, RS485, HART |
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Lining's choice
Lining material |
Main performance |
Highest medium temperature |
Applicable scope |
- build |
Separation |
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Teflon (F4) |
Is the chemical properties stablest one kind of plastic, the ability ebullition hydrochloric acid, the sulfuric acid, the nitric acid and the aqua regia, also ability thick alkali and each organic solvent. Does not bear the boron trifluoride chlorine, the high temperature boron trifluoride chlorine, the high flow rate liquid fluorine, the liquid oxygen, from the oxygen corrosion. |
70℃ |
100℃ 150℃ (needs special orders) |
1st, concentrated acid, alkali and so on strong corrosive medium. 2nd, health class medium. |
Gathers the entire fluorine second grade propylene (F46) |
With F4, the resistance to wear, anti-negative pressure ability are higher than F4. |
With on |
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Gathers the fluorine to gather the ethylene (Fs) |
Is suitable the temperature upper limit to compare the teflon to be low, but the cost is also low. |
80℃ |
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Gathers the chloroprene rubber |
1st, has the extremely good elasticity, the altitude breaking tenacity, the wear-resisting performance is good. 2nd, bears the general low concentration acid, the alkali, the salty medium corrosion, does not bear the oxidized medium the corrosion. |
80℃ 120℃ (needs special orders) |
Water, sewage, weak wearability mud pulp. |
Polyurethane rubber |
1st, the wear-resisting performance is greatly strengthened.
2nd, the anti-corrosive performance is bad. |
80℃ |
Neutral strong attrition pulp, coal tar, mud |
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Import protection flange and earth flange (or earth link) choice
Flange type |
Applicable scope |
Earth flange (or earth link) |
Is suitable in the non-conductor pipeline, if plastic pipeline, but has earth electrode's sensor not to need. |
Import protection flange |
When the medium has the strong wearability selects. |
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Electrode's choice
Electrode material |
Anticorrosion and wear-resisting performance |
Stainless steel 0Crl8Nil2M02Ti |
Uses in the process water, the domestic water, the sewage and so on having the pickling medium, is suitable in Industry sectors and so on petroleum, chemical industry, steel and iron and, domains and so on municipal administration, environmental protection. |
Alloy B |
Has the good corrosion resistance to below the boiling point all density's hydrochloric acid, also bears the sulfuric acid, the phosphoric acid, the hydrofluoric acid, the organic acid and so on non-chlorination acid, the alkali, non-oxidized salty fluid corrosion. |
Alloy C |
Ability non-oxidized acid, like nitric acid, nitration mixture, or chromic acid and sulfuric acid mix medium corrosion, also bears the oxidized salt as for example: Fe,”, Cu” under or including other oxidant's corrosion, like is higher than the normal temperature the hypochlorous acid salt brine, the sea water corrosion |
Titanium |
Ability sea water, each kind of chloride and hypochlorite, oxidized acid (including fuming sulfuric acid), organic acid, alkali corrosion. Does not bear the pure reducible acid (for example sulfuric acid, hydrochloric acid) corrosion, but like in the acid includes the oxidant (for example nitric acid, Fc++, Cu++) time, then corrodes to reduce greatly. |
Tantalum |
Has the fine corrosion resistance and the glass is very similar. Besides the hydrofluoric acid, the fuming sulfuric acid, the alkali, the ability - - cuts the chemical mediator nearly (including boiling point hydrochloric acid, nitric acid and the l 50℃ following sulfuric acid) the corrosion. In alkali tricky; Anticorrosion. |
Platinum/titanium alloy |
The ability - - cuts the chemical mediator nearly, but is not suitable for the aqua regia and the ammonium salt. |
Stainless steel spreading tungsten carbide |
Uses in non-corrosiveness, strong wearability medium. |
Note: As a result of the medium great variety, its corrosiveness receives the temperature, the density, the speed of flow and so on complex factor influence to change, therefore this table only supplies the reference. The user should act according to actual situation make the choice, when the necessity should do plans to choose the material the anticorrosive experiment, like lacing film experiment. |
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SKLD series electromagnetic flowmeter measuring appliance shaping
◆ measuring range scope confirmation
Generally the industrial used electromagnetic flowmeter was measured that the medium speed of flow take 2~4m/s as suitable, in the peculiar circumstance, the lowest speed of flow should not be smaller than 0.2m/s, highest should not be bigger than 8m/s. If in the medium includes the solid particle, the commonly used speed of flow should be smaller than 3m/s, prevents the lining and electrode's excessive friction; Regarding the viscous fluid, the speed of flow may choose is bigger than 2m/s, the great speed of flow is helpful to eliminates sluggish which automatically on the electrode adheres to stick cohere the function, is advantageous in the enhancement measuring accuracy.
In measuring range Q had determined under the condition, then acts according to above speed of flow V scope decision flowmeter caliber D the size, its value calculates based on the equation below:
Q=πD2V/4
Q: Current capacity (㎡/h) D: Pipeline inside diameter V: Speed of flow (m/h)
Electromagnetic flowmeter's measuring range Q should be bigger than the estimate the maximal-flow size, but the normal flow rate take is bigger than the flowmeter full scale scale division suitably slightly 50 as.
◆SKLD series electromagnetic flowmeter reference current capacity scope
Caliber mm |
Current capacity scope m3/h |
Caliber mm |
Current capacity scope m3/h |
φ15 |
0.06~6.36 |
φ450 |
57.23~5722.65 |
φ20 |
0.11~11.3 |
φ500 |
70.65~7065.00 |
φ25 |
0.18~17.66 |
φ600 |
101.74~10173.6 |
φ40 |
0.45~45.22 |
φ700 |
138.47~13847.4 |
φ50 |
0.71~70.65 |
φ800 |
180.86~18086.4 |
φ65 |
1.19~119.4 |
φ900 |
228.91~22890.6 |
φ80 |
1.81~180.86 |
φ1000 |
406.94~40694.4 |
φ100 |
2.83~282.60 |
φ1200 |
553.90~55389.6 |
φ150 |
6.36~635.85 |
φ1600 |
723.46~72345.6 |
φ200 |
11.3~1130.4 |
φ1800 |
915.62~91562.4 |
φ250 |
17.66~176.25. |
φ2000 |
1130.4~113040.00 |
φ300 |
25.43~2543.40 |
φ2200 |
1367.78~136778.4 |
φ350 |
34.62~3461.85 |
φ2400 |
1627.78~162777.6 |
φ400 |
45.22~4521.6 |
φ2600 |
1910.38~191037.6 |
The SKLDE series intelligence electromagnetic flowmeter chooses the spectrum
Model |
Caliber |
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SKLD |
15~2600 |
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Code number |
Installs the form |
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Y |
Integration |
F |
Fission type |
? |
Code number |
Switch model |
ZA |
Circular |
ZB |
Square shape |
? |
Code number |
Output signal |
I.4 |
4~20mA |
f |
Frequency 1KHz |
Rs |
Serial communication (485) |
C |
Control output |
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?Code number |
Explosion-proof request |
?N |
Does not have the explosion-proof |
EX |
The explosion-proof (is only suitable for fission type) |
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Code number |
Medium temperature |
T1 |
≤65℃ |
T2 |
≤65℃ |
T3 |
≤180℃ (is only suitable for fission type) |
? |
Code number |
Inside lining material quality |
NE |
Chloroprene rubber (≤65℃) |
PTFE |
Teflon (≤189℃) |
PVC |
Polyvinyl-chloride (≤70℃) |
? |
Code number |
Electrode material quality |
316L |
Stainless steel |
HC |
Alloy C |
HB |
Alloy B |
Ti |
Titanium |
Ta |
Tantalum |
The serial products includes: The integration electromagnetic flowmeter, the fission type electromagnetic flowmeter, the jack-in type electromagnetic flowmeter, the anti-corrosive electromagnetic flowmeter, brings the communication electromagnetic flowmeter |
