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CHONGQINGCHUANYIAUTOMATIONCO.,LTD.

TableofContents

WorkingPrincipleofVortexFlowmeter ）

VFC Ordinary TypeVortex Flowmeter Product Overview 02 Overall Dimensions 06 Selection of Converter 08

VFDVibration-resistantTypeVortexFlowmeter

ProductOverview 10
Overall Dimensions· 13
Selection of Sensors 20
Selection ofConverter 39

VFEIntelligentTypeVortexFlowmeter

Product Overview 41
Overall Dimensions 44
Selection of Converter 48

Technical Data

Installation of Vortex Flowmeter on Pipeline. 50
SelectionofVortexFlowmeterandPrecautionsforUse. 52
Guide forSelection ofVortexFlowmeter 53
Order Consultation Sheet 61

WorkingPrincipleofVortexFlowmeter

The vortex flowmeter isa kind of fluid oscillating flowmeter made on the basis of the principle of "Karman vortex street".Whenacylinderwitha non-streamlined cross section is inserted into a flowing fluid,two rows of staggered vortices are generated on both sides of the back of the cylinder.(Fig.1)

Where:

Bb

f:vortex shedding frequency St:dimensionless constant (Strouhal) V:average flow velocity on both sides of the cylinder

d:width of flow-facing surface of the cylinder

The fluid velocity and instantaneous flow can be measured by measuring the vortex shedding frequency. The Strouhal number St is a dimensionless constant that can be determined by tests.The linear part of the functional relationship between the Strouhal number St and the ReynoldsnumberRe is the linear measurement rangeof the vortex flowmeter.Thevelocity of the fluid in the pipe can be obtained by measuring the frequency f,and then the volume flow can be obtained from the flow velocity.The ratio of the number of pulses output in a period of time to the volume of the fluid (correspondingnumberof pulses that flow throughaunit volume of fluid）is called the meter coefficient (coefficient K).

Thevortex shedding frequency f is directly proportionalto theaverage flowvelocityVon both sides of the cylinder and inversely proportional to the cylinderwidth d:

{ f } = { S t } x { v / d } Formula(1)

K { = } { N } / { Q } （20号 Formula (2)

Where:

K:meter coefficient (pulse/m) N: number of pulses Q: fluid volume ( \mathbf { m } ^ { 3 * } 0

Fig.1Staggeredvortices <br>Fig.2VariationrelationshipbetweenStrouhal numberStandReynoldsnumberRe

VFCOrdinaryTypeVortex Flowmeter

Adaptive digital signal processing

The advanced DSP (digital signal processing) technologyisadopted.Thetraditional analog filteris replacedbythedigitalfilter.TheCPUisabletoadjust andprocessaccordingto thesensor signal inreal time, greatly improving the flexibility,reliabilityand stability of signal processing.

Simpleparametersetting

The frequently used parameter combinations are put in one module,reducing the parameter setting time.

Concise and clear display

The instantaneous flow,cumulative flow, percentage flow (expressed in % ）and self-diagnosis information can be displayed simultaneously.

Analog/pulse output

The 4 { * } 2 0 { m A } current output mode and pulse output modeare provided and can be setbykeys.

The range ratio of measurable flow isup to 1:10 Meter error compensation Intrinsically safe explosion-proof design

VFDVibration-resistantType VortexFlowmeter

Advanced FFT spectrum analysissignal processing technology

The most advanced FFT technology in the world is usedto analyze and processthevortex flow signal,and ableto accurately detect the vortex information in the small flow area,greatly expanding the measurable flow range of the meter.

Highstabilityandvibrationresistance

The international advanced dual-probe sensor technologyisadopted.One probe detects fluid flow and pipeline vibration signal,and the other one detects the pipeline vibration signal.In case of pipeline vibration intensity up to 3 { g } ,themeter is still able to accurately detect the effective vortex signal in strong interference to achieve accurate measurement,representing high stability and super vibration resistance.

High reliability

The reverse protection and purification technology isadopted for power supply，and the isolation technology is adopted for vortex signal processing,with

superanti-EMIcapability.

Lowflow

The lower limit velocity of measurable liquid of the meterisaslowas 2 { m / s }

(temperature: 2 0 ^ { \circ } { C } ；waterdensity: 1 0 0 0 ~ {kg / m } ^ { 3 } 0

Wide range

The range ratio of measurable flow isup to 1:5 ( { t } = 2 0 ^ { \circ } { C } { { \Delta P = l \ M P a } } ；diameter≥32mm)

VFDVibration-resistantType VortexFlowmeter

M

Advanced FFT spectrum analysis signal processing technology

Theadvanced FFT technology is used to analyze and process the vortex flow signal,and able to accuratelydetectthevortexsignalintheareawithsmall signalandlowflow,which makesthemeteralso have super stabilityandreliabilityinthe lowflowarea,and greatly expands the measurable flow range of the meter, with a range ratio of up to 1:5

Highreliability

The reverse protection and purification technology isadopted for power supply,and the isolation technology is adopted for vortex signal processing,with super anti-EMI capability.

Intelligent automatic zero setting

When itis confirmed that there is no flow in the pipeline,this function can be used to effectively remove the inherent interference signal.

Low-power consumption design

The working current of the meter is less than 4 { m A } and the total power consumption is less than 1 0 0 { m W }

Real-time temperature and pressure compensation

The built-in temperature sensor and pressure sensor of the meter are able to measure the temperature and pressure of the fluid in real time,and the mass flow or flowunder standard conditionscan be measured through real-time temperature and pressure compensation.The temperature error is ± 1 ^ { \circ } { C } ,and the pressure accuracyis ± 5 % { F S } （20

\*The warranty period of vortex flowmeter is one year (since the delivery date of the product)

OverviewofVFCOrdinaryTypeVortexFlowmeter

1.Application Scope

Thevortex flowmeter isavelocity-type flowmeter, one of the main flowmeter products in the world at present,and widely used in various industrial sectors, e.g.petroleum,chemical industry,metallurgy,municipal construction and environmental protection projects.The flowmeter is used to implement flow measurement, detection and control of liquids (e.g.water,oil, petroleum,alcohol and other chemical liquids),gases (e.g.air,oxygen,ammonia,natural gas and coal gas) and steam (saturated steam and superheated steam).The VFC ordinary type vortex flowmeter is suitable for working condition with small pipeline vibration and good site conditions.

2.ProductFeatures

Adaptive digital signal processing

The advanced DSP (digital signal processing) technologyis adopted.The traditional analog filter is replacedbythedigitalfilter.TheCPUisabletoadjust and process according to the sensor signal in real time, and also automatically track and select the band range of the filter according to the signal frequency，greatly improving the flexibility,reliability and stabilityof signal processing，and further enhancing the antiinterference capability of the meter.

Simpleparametersetting

The frequently used parameter combinations are put in one module,reducing the parameter setting time.

Clearand intuitive display

The low-power consumption 1 2 8 { x } 6 4 full dotmatrix LCD is adopted.

The instantaneous flow,cumulative flow, percentage flow (expressed in % ）andself-diagnosis informationcan be displayed simultaneously.

High precision

1 % ofreading (up to ± 7 5 % for liquid)

Wide temperature range

Ordinary type: - 4 0 ^ { \circ } { C } - 2 0 0 ^ { \circ } { C } ；high temperaturetype: - 4 0 ^ { \circ } { C } - 3 5 0 ^ { \circ } { C } （204号

Analog/pulse output

The 4 { * } 2 0 { m A } current output mode and pulse output mode are provided and can be set by keys.

Alarmoutput

Alarmoutput for out-of-range,EEPROM error, etc.

Data protection in case of power loss

Data(parameters,accumulated values,etc.）are stored inEEPROM,and no spare batteryisrequired.

Metererrorcompensation

The meter error can be compensated by 5 approximate polylines (by seting 5 compensation coefficients).

Analogtemperatureandpressurecompensation

For media with little change in temperature and pressure,the analog temperature and pressure compensation can be used to measure the mass flow and flow under standard condition,without external temperature sensors and pressure transmitters.

Interchangeability

The converter can be used with sensors of various diameters.

Intrinsicallysafe explosion-proof design

Explosion-proof sign: EXAICT 6 (NEPSI certification)

Blockage-free design

The whole sensor is made of stainless steel,with simple and firm structure and without moving parts, avoiding holes,gaps and washers that are prone to failure as much as possible.

Mechanical anti-vibration treatment

In the aspect of sensor, the vortex generator and probe are installed separately,and the probe adopts two main sampling piezoelectric wafers and two auxiliary sampling piezoelectric wafers.The signal detected by theprobeisnotaffectedbythemechanicalvibrationof the Vvortex generator.

Simple fault handling

The sensor is easy to install,and the meter coefficient is constant.Thanks to high data repeatability, the converter and sensor have good interchangeability, and the maintenance process is convenient and fast.

The following information shall be provided when you areplacingand order:

(1)Process parametersofmeasured media Name and composition of measured media;

Maximum flow,minimum flow and common flow (please indicate flow under standard condition 2 0 ^ { \circ } { C } ,1 MPa) and flow under working condition);

Maximum temperature and common temperature;

Maximum pressure and common pressure (indicate absolute pressure or gauge pressure);

Density under common working condition;

Viscosity under common working condition;

(2)Actual diameter of pipe (inner diameter,outer
diameter) (3)Output signal (4mA-20mA analog output or
pulse output) (4) Communication mode (HART communication,
RS485 communication, no communication) (5)Explosion-proof or not

OverallDimensionsofVFCOrdinaryTypeVortexFlowmeter

1.OverallDimensionsofClamp-onVortexFlowmeter

Integrated type <br>Split type (sensor)

2.OverallDimensionsofFlangeTypeVortexFlowmeter

The dimensions of flanges ( 2 . 5 \ : { M P a } ) listed in the above table are for reference only.The flange-connected vortex flowmeterisnot equipped with pipeline flangeandbolt incaseofdelivery fromfactory.Theusercanmachinethemby or buythem directly from the Company (please specify when ordering).The flange is slip-on-welding plate stel pipe flangewith raised face inaccordancewith HG/T20592-2009.

Selection ofVFCOrdinary TypeVortex FlowmeterConverter

1.IntroductiontoConverterPerformance

Output

Analog and pulse output modes,which can be set by the keys.

Analogoutput:(4-20) mADC,two-wire system

Pulseoutput:low level≤1VDC,high level >= SVDC (standard: lowlevel-1VDC,highlevel-5VDC)

Pulse frequency:3kHz max

Dutycycle:about 50 %

HARTcommunication

Communication signal: HART communication signal is 1 2 0 0 ~ { ~ H z } ： 2 2 0 0 ~ { ~ H z } analog signal is superimposed on(4-20) mADC signal

Communication load resistance:250Ω

Communication distance:up to 1 ~ { k m } in case of usingmulti-stranded cable.The communication distance variesaccording to the type ofcable used

Self-diagnosis and alarm output

Incaseofanalarm (outofrange,EEPROMerror and other abnormal phenomena),an alarm output signal is displayed

Data protection function in case of power loss

Data (parameters,accumulated flow,etc.) are stored in EEPROM,and no spare batteryis required

Damping time

Damping time is 5s-200s,which can be set by the keys

The minimum delay time is 5s

Linear compensation function

Meterpolyline correction:5 approximate polylines can be used to correct and compensate the linear error of the meter

Reynolds number compensation: The output error whenthe Reynolds numberisless than 10ooO can be compensatedby 5approximate polylines

Analog temperature and pressure compensation function

Incase of measuring medium with little change in temperature and pressure,the measured value of flowmeter can be the flow under standard condition or mass flow by seting the temperature,pressure and density with parameters.

Interchangeability

The converter can be used with sensors of various diameters.

Display

The low-power consumption 1 2 8 { x } 6 4 full-dotmatrix LCD isadopted,with clear and intuitive display.

The short information of self-diagnosis can be displayed;

The instantaneous flow,cumulative flow, percentage flow (expressed in % )canbedisplayed;

Such information as output current and pulse can be viewed through key setting.

Explosion-proof performance

(See GB 3836.1 and GB 3836.4 for detailed explosion-proof parameters;see GB 3836.1 and GB 3836.2for flameproof parameters).

Small signal excision

When the flow is lower than the set low flow value, the output is 4 { m A } or 0 pulse.

2.SelectionTableofVFCOrdinaryTypeVortexFlowmeter

Sensor Converter VFC XXX 冈冈区冈冈冈网冈 xx 区 冈 冈冈 区 区区 Main name Diameter:DN15\~DN600 Threedigits:thefirstand seconddigitsof Dnand the number of zeros following the firsttwodigits(unit:mm). DN125 is special,whichis indicatedby1. Standard pressure 1: 1.6MPa 2:25MPa 3:1.0MPa 4:20MPa(ANSI150) 5:4.0MPa 6:5.0MPa(ANSI300) 9: Other Structureand materialcomposition Material combination sequence:body-generator-probe O:stainlesssteel-stainlesssteel-stainlesssteel 1:304-304-304 2:HC-HC-HC 3:304-304-316L 4:304-316L-316L 5:316L-316L-HC 6:316L-316L-316 7:316L-HC-HC8:316L-HC-316L 9:Other Note:If2 is selected,it isfor theclamped flowmeter<DN80only Measuring medium 1: Liquid 2:Gas 3:Steam Operatingambient temperature General places:ambient temperature:(-20\~70)℃ Hazardous places:ambient temperature:(-20\~60)℃ 1:Mediumtemperature:(-40C\~120)℃ 2:Medium temperature:(-40\~200)C(split type forabove 1 2 0 ^ { \circ } { C } ） 3:Medium temperature:(-40\~350)℃ (split type for above 1 2 0 ^ { \circ } { C } Connection method 1: Clamped type 3:Flange connection type Calibration A:Standard test level1.0E: Special test Cablelength Split type:<20m; integrated type:00. Anyspecial requirement shalf be indicated at ordering Outgoing line seal 1:G1/2"internal thread 2:1/2"NPT internal thread 3:M20X1.5 Type VH: Integrated type VR: Split type Power supply 1: 24VDC Display 2: With display Output form 1:4mA\~20mA.DC output,two-wire system 2:Pulse output,two-wire system Operating environment 1: General place 2:Hazardous place: intrinsically safe explosion-proof 3:Hazardous place: explosion-proof Display direction 1: Standard direction Language 1: English Communication protocol 0:N/A 1: HART kT

OverviewofVFDVibration-resistantTypeVortexFlowmeter

1.Application Scope

The VFD vibration-resistant vortex flowmeter is a high-performance flowmeter product introduced by the Company.TheVFDvibration-resistantvortexflowmeter adopts the international leading digital signal processing technology，completely breaks the traditional vortex flow mode,isa new revolution of the vortex flowmeter, andbringsthevortexflowmeterproductstoanewlevel. This meter is still able to measure accurately when the vibrationintensityofthepipelineisashighas 3 { g } and the flowisaslowas 2 ~ { m / s } .TheVFD vibration-resistant vortex flowmeter has super stability and vibration resistance,and is specially used in the worstworking environment.

2.ProductFeatures

Advanced FFT spectrum analysis signal processing technology

The international most advanced FFT technology is used to analyze and process the vortex flow signal, and able to accurately detect the Vortex signal in the area with small signal and low flow,which makes the meter alsohavesuper stabilityand reliabilityinthelowflow area,and greatly expandsthemeasurable flow range of the meter,with a precision range of up to 1:2

High stabilityand vibration resistance

The international advanced dual-probe sensor technology is adopted.One probe detects fluid flow,and the other one detects the pipeline vibration.In case of pipeline vibration intensity up to 3 { g } ,the meter is able to automaticallyanalyze the fluid conditionin the pipeline and the vibration of the pipeline itself,and accurately detect the effective vortex signal in strong interference to achieve accurate measurement,representing high stabilityand super vibration resistance.

Highreliability

The reverse protection and purification technology isadopted for power supply，and the isolation technology is adopted for vortex signal processing,with super anti-EMI capability.

Lowflow

Thelowerlimit velocityofmeasurable liquidof the instrument isas low as 2 ~ { m / s } (temperature: 2 0 ^ { \circ } { C } ；water density: 1 0 0 0 ~ {kg / m } ^ { 3 } ）

Wide range

Precision range:up to 1:2

Low-power consumption design

The working current of the meter is less than 4 { m A } and the total power consumption is less than 1 0 0 { m W }

Simple parametersetting

The frequentlyused parameter combinationsare put in one module,reducing the parameter seting time.

Concise and clear display

The instantaneous flow,cumulative flow, percentage flow (expressed in % ）andself-diagnosis information can be displayed simultaneously.

Highprecision

1 % of reading (the highest for liquid) ± 1 . 0 % ofreading (gas\steam)

Wide temperature range

Ordinary type: ( - 4 0 - 2 0 0 ) ^ { \circ } { C } High temperature type: ( - 4 0 - 4 0 0 ) ^ { \circ } { C } （204号

Analog/pulse output

4 { * } 2 0 \ { \ m A } current signal and pulse signal can be output simultaneously

Alarmoutput

In case of out-of-range,EEPROM error,etc.,an alarmis output and displayed.

Data protection in case of power loss

Data (parameters,accumulated values,etc.）are stored inEEPROM,and nospare batteryisrequired.

The meter error can be compensated by 5 approximate polylines (by seting 5 compensation coefficients).

Interchangeability

The converter can be used with sensors of various diameters.

Intrinsicallysafeexplosion-proofdesign:

Explosion-proof sign:ExiaIICT1\~T6Ga ExdbIICT1\~T6Gb

Blockage-free design

Thewhole sensor is made of stainless steel,with simple and firm structure and without moving parts, avoiding holes，gaps and washers that are prone to failureasmuchaspossible.

Mechanical anti-vibration treatment

In the aspect of sensor, the vortex generator and probe are installed separately,and the probe adopts two mainsampling piezoelectric wafers and two auxiliary sampling piezoelectric wafers.The signal detected by the probe is not affected by the mechanical vibration of the vortex generator.

Simple fault handling

The sensor is easy to install,and the meter coefficient is constant.Thanks to high data repeatability, the converter and sensor have good interchangeability, and the maintenance process isconvenient and fast.

OverallDimensionsofVFD Vibration-resistantTypeVortexFlowmeter

1.OverallDimensionsofClamp-onVortexFlowmeter

Integrated type Split type (sensor)

2.OverallDimensionsofFlangeTypeVortexFlowmeter

Unit:(mm)

SelectionofVFD Vibration-resistantType Vortex Flowmeter Sensor

The basic technical parameters are listed as follows. In case of selection,the diameter can be determined as per look-up table method (water,saturated steam,air), calculationmethod orselectionsoftware.

(1）Minimum measurable flow velocity

{ ~ ~ { ~ \vec { ~ } { ~ \rho ~ } : ~ } ~ } density of steam in operating state ( {kg / m ^ { 3 } } ) （2号 Density of liquid:(400-2000） {kg / m } ^ { 3 } Density of gas and steam: { >= } 5 {kg } / { m } ^ { 3 }

Fig.3TemperatureRangeofHighTemperatureFluid

Fig.4Relationship between power supply voltage and load resistance

(2）Measurable flow range of gas

When measuring air at normaltemperature and pressure,the applicable flow rangeofthe meter is shown in Table I. When measuring air and other gases at non-normal temperature and pressure,the applicable flow range of the meter shall be specifically calculated.See the notes below.

Theabove table refers to the airat normal temperature and pressure

Reference conditions: { t } = 2 0 ^ { \circ } { C } { { \cal P } _ { 0 } } { = } 1 MPa (absolute pressure), { \ p _ { 0 } { = } 1 . } 2 0 5 {kg / m } ^ { 3 } { V { = } 1 5 ^ { - 6 } m ^ { 2 } / s { x } 1 0 ^ { - 6 } m ^ { 2 } / s } flow range Thelower limitflow of vortex flowmeter depends on the density under working conditionand kinematic viscosity of medium

Theupper limit flowof vortex flowmeteris generally notaffected by the pressureand temperature of the medium Therefore,determining the flow range is actually to determine the actuallyavailable lower limit flow

The calculation method for the suitable flow range of the meter for gases at non-normal temperatureand pressure ; as follows:

Step1 According to Formula (3)，calculate the lower limit flow Qp determined by the density under working condition.When the medium density is large, themeasurablelowerlimitflowoftheflowmeterislow.

Where:

{ ~ Q ~ } _ { \rho } ：measurable lower limit flow determined by medium density under working condition

{ \Delta Q _ { 0 } } ：lower limit flow at air reference density specified in Table(I) (found in Table (I)) （204号 \rho _ { 0 } ^ { { ~ ~ } } air reference density specified in Table (I), （204号 \rho _ { { 0 } } = 1 . 2 0 5 {kg / m } ^ { 3 } （20 p:density under working condition of measured medium

Step2According to Formula (4),calculate the lower limit flow Qv determined by the kinematic viscosityof the mediumunderworkingcondition

When the kinematic viscosity of the medium is small, thelinear lower limit flow of the flowmeteris low.

Where:

Qv:linear lower limit flow of flowmeterwhen used in this medium { \Delta Q _ { 0 } } ：lowerlimitflowatreferencemediumviscosity specified in Table (I) (found in Table (I)) { V } _ { 0 } { { : } } air reference viscosity specified in Table (I),15 {mm ^ { 2 } / s } （20 V:viscosity of measured medium under working condition

Step3Compare { \Delta Q _ { v } } and { Q } _ { \rho } to determine the available lowerlimit flowand linearlowerlimit flow.

In case of { Q } _ { { v } } { >= } { Q } _ { { \rho } } ，the measurable flow range is{ Q } _ { \rho } { ~ } { Q } _ { \operatorname* { m a x } } （204号

The linear flow range is { Q } _ { { v } } { ~ } { Q } _ { \operatorname* { m a x } }

In case of \scriptstyle { Q _ { { v } } < Q _ { { \rho } } } ，themeasurable flow range and linear flow range are all { Q } _ { \rho } { ~ } { Q } _ { \operatorname* { m a x } }

{ Q } _ { { m a x } } ：upper limit flowspecified in Table (I).

Important note:

Forgases with low density or high viscosityat normal temperature and pressure (e.g. hydrogen),the available lowerlimitflowof theflowmeterisveryhigh. Iftherequireduseflowislow,thevortexflowmeteris probablynot suitable.Thevortex flowmeteris suitable forsuch gas onlyunder the conditionsofhigh pressure and large flow,and the available flow range must be strictly calculated according to the steps above.

Example of selection calculation

Example1Measure a gaswhen its density and viscosity are known,with density { \rho { = } } 1 . 6 6 8 ~ {kg / m } ^ { 3 } and viscosity { V } { = } 1 3 { x } 1 0 ^ { - 6 } { m } ^ { 2 } / { s } （2号

Try to calculate the flow under minimum working condition that can be measured by DN1oo flowmeter.

Step1Calculate the lower limit flow under working condition determined by density

According to Table (I),the lower limit flowofDN100 gas is 1 1 3 ^ { 3 } / { h } ,which is substituted into Formula (3):

The minimum measurable flow of gas measured by DN100 flowmeter is 9 6 ~ { m } ^ { 3 } / { h }

Step2Calculate the linear lower limit flow determined by kinematic viscosity

The linear lower limit flow of gas measured by DN100 flowmeter is 9 8 ~ { m ^ { 3 } / h }

Step3 Compare { Q } _ { { v } } and { Q } _ { \rho }

Due to Q _ { { { v } } } { > } Q _ { { { \rho } } } ，theavailable lower limit flow is\scriptstyle { { Q p } } = 9 6 { { ~ m } } ^ { 3 } / { { h } } （204号

The linear lower limit flowis 9 8 ~ { m } ^ { 3 } / { h }

Conclusion:WhentheDN1ooflowmeterisused for this gas,the lower limit flow is 9 8 ~ { m ^ { 3 } / h } ，and the flow range is ( 9 8 - 1 6 9 6 ) { m } ^ { 3 } / { h }

Example2When the pressure,temperature, and flow under standard condition of the gas are known

Atthistime,the flow under standard condition must be converted into the flow under working condition,andthenlookupthetableforcalculation.

Fora certain compressed air,in case ofQnunder standard condition \ : = \ : ( 1 0 { - } 6 0 ) \ : { \ m ^ { 3 } / m i n } ，pressure under working condition { { \Delta P = 7 } \ M p a } and temperature { t } { = } 3 0 ^ { \circ } { C } determine the flow diameter.

Important note:

Atthistime,firstconverttheflowunderstandard condition into the flow under working condition,and thenlookupthetableforcalculation

Step1 Calculate flowunderworkingcondition First convert the given flow per minute to flow per hour

Converttheflowunderstandardconditionintoflow under working condition accordingto ideal gas state equation:

\operatorname { P } _ { \mathfrak { n } } \colon atmospheric pressure under standard condition (101325MPa)
P:medium pressure under working condition \mathbf { α } = ( \mathbf { M P a } ) \operatorname { T } _ { \mathfrak { n } } \colon temperature under standard condition (273.15K) T:medium temperature under working condition { ^ \circ C } ） Convert the minimum flow
Q=600×[0.101325/(0.7+0.101325)]×[(273.15+30)/273.15]
= 6 0 0 x 0 . 1 2 6 4 x 1 . 1 0 9 8 （204号
\scriptstyle = 8 4 ( { m } ^ { 3 } / { h } ) （204号

Then the minimum flow used under working condition is 84 ( { m } ^ { 3 } / { h } )

The maximum flow under converted maximum flow condition is { Q = 8 4 x ( 6 0 / 1 0 ) = 5 0 4 ~ ( m ^ { 3 } / h ) }

Step2According to flow range under service condition,i.e. ( 8 4 - 5 0 4 ) ~ { { m } } ^ { 3 } / { { h } } ,bylookingup Table (I),the flowrangeunderworkingcondition of DN8o flowmeter is (72-1086) { m ^ { 3 } / h } ,which isclose to the use flow range, and the DN8o flowmeter is selected primarily;however, thelowerlimit flowof the DN8Oflowmeterunderthe service conditions of the medium shall be further calculated.

Examine and calculate the lower limit flowof DN80 flowmeter under this working condition:

Namely,the lower limit flow of the flowmeter under this working condition is 2 7 ~ { m ^ { 3 } / h } ,which is far less than the required lower limit flow under working condition of 8 4 ~ { m ^ { 3 } / h } ，soitisdetermined to select DN80 flowmeter,witha flow range of ( 2 7 - 1 0 8 6 ) { m } ^ { 3 } / { h }

Note:The kinematic viscosity of 7 \ { \ M P a } compressed air is 1/8 of that of the air at normal temperature and pressure.According to Formula (4),it canbe estimated thatthelinearlower limit flowis 72/8 { m } ^ { 3 } / { h } { = } 9 ~ { m } ^ { 3 } / { h } ,whichis farlessthan { Q } _ { \rho } \left( 2 7 { m } ^ { 3 } / { h } \right)

(3)Liquid measurable flow range

Notes:

1）The liquid in the table refers to the water at room temperature, t { = } 2 0 ^ { \circ } { C } ， { \ p _ { 0 } { = } 1 0 0 0 ~kg / m ^ { 3 } } ， \scriptstyle { V o = L } x 1 0 ^ { - 6 } { m ^ { 2 } / s } （204号 2）If the measured liquid is not water and the liquiddensityisknown,the flowrange can becalculated according to Formula (3). 3）When calculating the measurable lowest limit flow of liquids under different densities, \rho _ { { 0 } } shall be taken as 1 0 0 0 ~ {kg / m } ^ { 3 } （20 4）The maximum flow rate of liquid shall generally be { < } 9 { m / s } ，

Flow range under actual service conditions

When the liquid used is not water under normal temperature,calculate the actual measurable flow range under working condition.

The lower limit flow of vortex flowmeter depends on the densityunder workingconditionand kinematic viscosity of medium.Determining the flow range is actuallyto determine the actuallyavailable lower limit flow.

Determine theactuallyavailable lowerlimitflow

Step1According to Formula (3),calculate the lower limit flow determined by the medium density. When the medium density is large,the measurable lower limit flow of the flowmeter is low.

Where:

{ ~ Q } _ { \rho } ：measurable lower limit flow determined by medium density underworking condition { \Delta Q _ { 0 } } ：lower limit flow of water under normal temperature specified in Table (II) (found in Table (II)) （204号 \rho _ { { 0 } } ：reference density of water under normal temperature specified in Table (I), \rho _ { { 0 } } { = } 1 0 0 0 {kg / m } ^ { 3 } （20 P:density under working condition of measured medium

Step2According to Formula (4),calculate the lower limit flow Qv determined by the kinematic viscosity of the medium under working condition

Where:

Qv:linear lower limit flow of flowmeterwhen used in thismedium

{ \Delta Q _ { 0 } } :lowerlimit flowatreferencemediumviscosity specified in Table (II) (found in Table (II))

{ \Delta V _ { { 0 } } } ：kinematic viscosity of water at normal temperature specified in Table (II), 1 0 ^ { - 6 } { m ^ { 2 } / s } （202

V:density under working condition of measured medium

Step 3 Compare { \Delta Q _ { v } } and { ~ Q ~ } _ { \rho } to determine the available lowerlimitflowand linear lowerlimit flow

In case of { Q } _ { { v } } { >= } { Q } _ { { \rho } } ,the measurable flow range is { Q } _ { \rho } . { Q } _ { { m a x } } ,and the linear flow range is { Q } _ { { v } } { { - Q } _ { \operatorname* { m a x } } } （204号

In case of \scriptstyle { Q _ { { v } } < Q _ { { \rho } } } ,themeasurable flow range and linear flow range are all \mathbf { Q } _ { { { p } } } { - } \mathbf { Q } _ { { { m a x } } }

Qmax:upper limit flow specified in Table (II).

Important note:

For most industrial liquids,e.g.refinery products and chemical liquids,the main reason affecting their lowerlimitflowisdensity,andthe lowerlimitflow determined by density can only be examined and calculated accordingto Step(1).Forsomemediawitha densitysimilartothatofthewater,thelowerlimitflow specified in Table (II) can even be directly adopted without calculation.For high-viscosity liquids,e.g. heavy oil,the lower limit flowdeterminedby viscosity ismainly examined and calculated according to Step (2). The heavy oil and other high-viscosity liquids shall be heated toan appropriate temperature,and theviscosity shall be reduced to a certain value before the vortex flowmeter can be used.

Example of selectioncalculation:

Example1:Liquid density and viscosity are known

The density 7 5 { T / m } ^ { 3 } dynamic viscosity of #0 diesel is5 centipoises.Determine the flow range of DN80 flowmeter for O# diesel.

Step1According to Table (II),the normal temperature water flow rangeofDN8O flowmeter is （2号 ( 5 . 4 { ~ } 1 6 3 ) { m } ^ { 3 } / { h } （204号

Step2According to Formula (3),calculate the lower limit flow { ~ Q ~ } _ { \rho } determined by the density of the mediumused

Note: 7 5 { T } / { m } ^ { 3 } { = } 7 5 0 {kg } / { m } ^ { 3 }

Step 3According to Formula (4),calculate the lowerlimit flow Qv determined by the density of the medium used

Firstly,calculate the kinematic viscosity according to the dynamic viscosity:

Step 4 Q _ { v } { > } Q _ { \rho } ,available flowrange: 6 . 2 4 { ~ } 1 6 0 ( { m } ^ { 3 } / { h } ) Linearflowrange: 3 6 . 2 { ~ } 1 6 0 ( { m } ^ { 3 } / { h } ) （20

Important note:

Forhigh-viscosityoil,the linear lower limit flowof aflowmeterismuch higher than water.

(4)Measurable flow range of steam

When the measured medium is steam,the common unitofmeasurement ismass flow,that is, { { t / h r } } or {kg / h } 业 Because the density of steam (superheated steam and saturatedsteam)isdifferentatdifferenttemperaturesand pressures,the steam flow range varieswith pressure and temperature,which can be calculated byFormula (6).

The calculation is as follows:

Step1Find out the air flow range of the corresponding caliberflowmeter from Table (I)

Step 2 According to the pressure and temperature parameters of steam,check relevant data to obtain the densityof steam

Step3 Calculate thelower limit flow of the flowmeter according to Formula (6)

p,Q:density and flow of measured steam \rho _ { { 0 } } . \scriptstyle { { ~ Q _ { 0 } ~ } } ：densityand flowof reference air

Step 4 The upper limit flow rate of steam for determining the upper limit flow shall be controlled below 7 0 { { m } / { { s } } . }

Selection calculation example (saturated steam)

Example 2: When the saturated steam pressure isknown

Calculate the flow range of 8MPa saturated steam with DN100 flowmeter.

Step1 Check theair flow range of DN100 flowmeter from Table (I), ( 1 1 3 - 1 6 9 6 ) { m } ^ { 3 } / { h }

Step2 Check the densityat 8MPa fromquick checktableof mass flowrange of saturated steam(Table (III),see the next page), { \rho } ^ { = 4 . 1 6 2 {kg / m } ^ { 3 } } （204号

Step 3 Calculate lower limit flow according to Formula (6)

Step 4 Check upper limit flow,which shall not exceed 7 0 { m / s } （20

Theavailable steam flow ranges of flowmeters of differentdiametersare listed in Table III (see the next page)，which can be found out by steam reference calculation.

Selection calculation example (superheated steam)

\star Example 3:When the pressure and temperature of superheated steam are known

Calculate the flow range of superheated steam with pressure of 1 . 0 { { M P a } } and temperatureof 3 0 0 ^ { \circ } { C } forDN80 flowmeter.

Step1 Check theair flowrangeofDN80flowmeter from Table (I), ( 7 2 { ~ } 1 0 8 6 ) { m } ^ { 3 } / { h } （204号

Step2 Check the density of 1 . 0 { M P a } / 3 0 0 ^ { \circ } { C } superheated steam from Density Table (IV) of Superheated Steam, \rho { = } 4 . 1 9 1 {kg / m } ^ { 3 }

Step3 Calculate the flow according to Formula (6)

Step 4 Check upper limit flow,which shall notexceed 7 0 { { m } / { { s } } } （204号

See the next page for Table(V),which is the quick calculation table of superheated steam,and the flow range canbe calculated byputting the steam densityinto Table (V).

Important note:

Whenmeasuring steam,to measure the mass flow ofsteam,the vortex flowmetermust be combined with temperature and (or) pressure measuring elements to form a mass flow measurement system;for the measurement of saturated steam,temperature compensation or pressure compensation (one of them) shallbe added;forthe measurement of superheated steam,temperature compensation and pressure compensation (both) shall be added.

Table(III)QuickCheck TableofMassFlowRangeofSaturatedSteam

Unit: (kg/h)

Quick Check TableofMassFlowRange of Saturated Steam(Continued)

Unit: (kg/h)

(5)The diameter of the selected sensor is the same asthat of the connected processpipeline

This option is convenient for installation

(6)The diameter of the selected sensor is different from that of the connected processpipeline

Thisoption isapplicablein the following situations:

A.The flow rate in the pipeline is low,and the process flow isrelatively stable.In order to meet the requirements of the instrument for the flow rate range, thediameterof the sensor can be selectedto be smaller than that of the process pipeline,and a reducer can be added in front of and behind the sensor.

B.Considering the price,for large-diameter vortexflowmeter,thelargerthediameter,thehigherthe price.When the flow rate in the pipeline is low and the processparameters are stable,the sensor with smaller diameter canbe selected,which cannot onlymake the instrument run in betterworking condition,but also reduce the investment cost of the instrument.

(7）Precautions for installing reducer

In order not to affect the distribution of flowrate field too much and the measurement accuracy of the instrument, the central cone angle \mathfrak { a } of the reducer shall not be greater than 1 5 ^ { \circ } ，so that the reducer can be regarded as a part of the straight pipe section.

Fig.6Installation ofInstrumentonReducer

(8)Selection of diameter code

The expression of the diameter of VFD series vortex flowmeter is three digits: the first and second digits of DN and the number of zeros following the first two digits (unit:mm).For example,code 150 indicates that the diameteris 1 5 {mm } ；code151indicatesthatthediameteris 1 5 0 {mm } ；152 indicates that the diameter is 1 { , } 5 0 0 {mm } 业 DN125 is special, indicating that the code is 121.

(9)Pressure loss

Waterspeed is { 1 0 m / s } , \triangle \mathsf { p } { = } 1 0 8 { { k P a } }

When the air speed under atmospheric pressure is 8 0 { m / s } \triangle \mathsf { p { = } 9 k P a } （20

Pressure loss can be obtained from the following formula:

Where:

\triangle \mathbf { P } pressure loss (kPa)
{ { { P } } } _ { { f } } \colon density in operating status (kg/m)
v: flow rate { ( m / s ) } 1
\mathbf { Q } _ { { f } } { : } actual flow ( { m } ^ { 3 } / { s } ^ { * } 0
D:inner diameter

The following figure shows the curve ofthe relationship between pressure loss and actual flow.

Fig.7Actual flow of gasand steam { m ^ { 3 } / h }

Example of pressure loss calculation:

With diameter of 5 0 {mm } ，waterwith temperature of 8 0 ^ { \circ } { C } ,andflowof 3 0 { m } ^ { 3 } / { h } ,the pressure loss is:

① Thewater densityat 8 0 ^ { \circ } { C } is 9 7 2 {kg / m } ^ { 3 } ,and put the value into Formula (2).

② Calculate pressure losswith Formula (1).When the flow is 3 0 { m } 3 / { h } ,calculate the flow with the following formula:

Therefore,put the value into Formula (1):

③ Check the table to obtain pressure loss.The liquid pressure loss coefficient is 18.5,according to formula \scriptstyle \bigtriangleup \mathbf { P } = \mathbf { C } x \mathbf { \rho } x \mathbf { \rho } ^ { - s }

Where: \triangle \mathbf { P } ：pressure loss ( {kg /cm ^ { 2 } } ) p:density: ( {kg / m } ^ { 3 } )

(10) Cavitation (minimum back pressure,liquid only)

Inliquid measurement,when the liquid pressure in the pipeline is very lowand the flowrate isveryhigh,cavitation will be generated to affect the correct measurement of flow. To prevent errors in flow measurement, the following minimum pipe pressure can be used:

Where:

P:pipe pressure with downstream side 2\~7D from the end face of the flowmeter (kpabs)

△P:pressure loss ( { { k P a } ) } ,similarlyasabove.

{ \bf P } _ { 0 } ; saturated steam pressure of liquid in operating status (kPabs)

Example:Confirmwhether there is cavitation

It is only necessary to confirm the maximum flow (when the pressure lossis the greatest).In the example, the pipeline pressure is 12okPabs and the measuring range is 0 { ~ } 3 0 { m } ^ { 3 } / { h }

From Example 1,the pressure loss is 1 7 . 3 { { k p a } } ,and from the saturated steam table,the saturated steam pressure ofwaterat 8 0 ^ { \circ } C is:

{ P _ { 0 } } { = } 4 7 . 7 4 4kPabs

Put the above value into Formula (3):

{ P } { = } 2 . 7 { x } 1 7 . 3 + 1 . 3 { v } { x } 4 7 . 4 { = } 1 0 8 . 3 { k } Pabs

Because the operating pressure of 12okPabs is greater than that of 1O8.3kPabs,cavitation is not produced.

2.MaterialSelectionofLiquid ConnectionPart

According to the different media measured by users,twodifferent materialsare provided,3O4stainless steel and 316L stainless steel.For special material requirements,please contactus for special orders.

(1）Sensor of clamped vortex flowmeter

Liquid connection part includes the following parts: ① .Triangular column (vortex generator) ② .Probe (vortex detector) ③ .Probe base ④ Meter body

Note:To select different materials for the liquid connection part, please ensure that ③ is consistent with ④

Clamped sensor DN15\~DN25 is provided with probe base.

(2）Sensor of flange vortex flowmeter

Liquid connection part includes the followingparts: ① .Triangular column (vortex generator) ② .Probe (vortex detector) ③ .Probe base ④ .Meterbody ⑤ ： Flange

Note:To selectdifferentmaterials forthe liquid connection part,please ensure that ③ ， ④ and ⑤ are consistentwith each other.

Flange type

3.SelectionofIPGrade

According to GB 4208,the shell IP grade of instrument can be divided into the following categories:

IP65:The water spraying type allows water to be sprayed from any direction on the instrument with the waterspraying pressure of 3 0 { { k P a } } ，thewater output of 12.5L/Min and the nozzle distance of 3 { m } from the instrument.

IP66:The violent water spraying type strongly sprays waterto the shell inall directionswithout harmful effect, the water output is 1 0 0 { L / m i n } ,and the duration is 3 { m i n } ：

Ip67:Immersed instrument can be completely immersed inwater(lmunderwater) inashort time,with duration of 3 0 { m i n }

4.SelectionofCable

The connecting cable between the sensor and the converteris dedicated.Thelength ofthecable inthe model specification table refers to this cable section,and itslength generally doesnot exceed 3 0 { m } (if the required length is longer than 3 0 { m } ，please consult with the manufacturer).The connecting cable between the sensor and the converter generally requires iron pipe for protection when it is installed on site.

5.SelectionofSealingWasher

When used in general workplaces,flexible graphite sealingwasherscanbe selected;

When used in hazardousworkplaces,PTFE sealing washers can be selected when measuring explosive gases such as oxygen.

6.SelectionofFlange

The flange for clamped vortex flowmeter isa standard part,and ismade of carbon steel.

The flange for flange vortex flowmeter isan optional part.To place an order,please provide the dimension and material requirements of the instrument connecting pipe.

If there are no special material requirements,the flange will be made of carbon steel.For special materials and other standard flanges,please contact us confirmation before placing an order.

Thestandard formatching flanges is HG/T 20592- 2009.For common flange specifications,please refer to the flange dimension table of flange introduction part of this sample.

7.DeterminationofOperating Environment

Operating environment refers to the environment around theinstrument,which can be divided into general workplacesand hazardousworkplaces.

General workplace referstoa safe placewithout combustible gases and explosive substances,the operatingenvironmenttemperature isbelow ( - 4 0 { ~ } 6 5 ) ^ { \circ } { C } and the upper limit of medium temperature is divided into 2 0 0 ^ { \circ } { C } and 3 5 0 ^ { \circ } { C } ，andthe instrument is optional between integrated type or split type.Hazardous workplace refers to the workplace with combustible gases and explosive substances.The operating environment temperature is ( - 4 0 { ~ } 6 5 ) ^ { \circ } { C } , ,and the medium temperature shall not be higher than 2 5 0 ^ { \circ } { C } ：

8.SelectionofExplosionproofAccessories

The vortex Flowmeter is intrinsically safe and explosion-proof,and the product must be matched with the isolated safety grid,otherwise the intrinsically safe explosion-proof performance of the vortex Flowmeter cannot be guaranteed.

Isolated safety grid is optional.If explosion-proof products need this accessory，please explain when ordering.

9.ReducingSolution

(1).Advantagesofmeasurement lower limit:

The minimum lower limit of liquid measurement can reach 1m/s

The minimum lower limit of gas measurement can reach 1m/s

Both ends of the sensor body are equipped with internal reducing pipe/internal expanding pipe for low flow measurement.

Up to 2 smaller sizes of diameter reduction can be selected

Same flange spacing

(2).Advantages of interchangeability:

The safety of the reducing type is the same as that of the standard type,and there is no leakage point.

The flange dimensions and spacing of the reducing typeare the same as those of the standard type,so it is more convenient to replace.

(3).Advantages of low cost

It is unnecessary to install internal reducing pipe/internal expanding pipe and stub,as well as matchingpipe flanges.

Reduce on-site installation space,lower installation cost and improve safety!

Installationsolution

New solution of installation of reducing type

Solution of conventional type <br>Standard vortexflowmeter

10.SolutionofWaterHammer

(1).Introduction to water hammer

Water hammer effect isa kind of visual statement, whichreferstoaseriouswaterhammercausedbythe water impact on the pipeline when the feed pump is started and stopped.Because in the pipe,the inner wall of the pipe is smooth,the water flows freely.When an open valve is suddenly closed or the feed pump is stopped, the water flow produces a pressure on the valve and the pipe wall,mainly the valve or pump.Because thepipe wall is smooth,the subsequent water flow reaches the maximum force quickly under the action of inertia,and hasa destructive effect,which is the "water hammer effect" in hydraulics,that is,positive water hammer.On the contrary，when a closed valve is suddenlyopenedorthefeedpumpisstarted,awater hammer is also produced,which is called negative water hammer,but not as large as the former.

(3).Causestowaterhammer

Of course, the water hammer will occur not only in thewater system,but also in the steam system.When it occursinasteamsystem,awaterhammerissometimes called a "steamhammer".

(2).Hazardofwaterhammer

When the steam is assigned to the steam line or enters the equipment,you will hear the metal "bang, bang,bang"sound,and a similar situation will happen to manysteamusers.

When a water hammer occurs,it will instantly produce more than 1oMPa pressure in the pipe.

Quickcondensation and collision of steam producesa water hammer

This will cause serious impact on the pipe, equipment or equipment room，which may cause damageto thedetectionbody of the flowmeterinserious conditions.

(4).Waterhammersolution

(5).Important tips (in case of the following process, itisrecommendedtoaddawaterhammereliminator toprotectthe flowmeterfromdamage)

1.The valve is opened or closed quickly; 2.The water pump unit is stopped or started suddenly; 3.Waterisdelivered toa high place through a singlepipe(withwatersupply elevationdifference of above 20m); 4.The water pump has a high total lift (or operating pressure); 5.Too high water flow rate inwater delivery pipe; 6.Too long water delivery pipe,and great terrain change.

ConverterSelectionof VFDVibration-resistantTypeVortexFlowmeter

1.IntroductiontoConverter Performance

川

\star Advanced FFT spectrum analysis signal processing circuit module

The converter adopts advanced FFT spectrum analysis signal processing circuit module,which can accuratelydetect the vortex informationina small signal and low flowarea,so that the instrument hassuper high stabilityand reliabilityin the low flowarea,and the measurable flow range of the instrument is greatly expanded.Besides,the fluid situation in the pipe can be analyzed,and the best judgment and adjustment can be made according to the analyzed data,reflecting high stability, intelligenceand vibrationresistance.

★Intelligent automatic zero setting.When it is confirmed that there is no flow in the pipe,this function can be used to effectively remove the inherent interference signal.

Output

Analog and pulse output modes,which can be set bythe keys.

Analog output; 4 { ~ } 2 0 { m A } DC，two-wire pulse output: low level <= 1 { V } DC,high level >= 5 { V } DC (standard:lowlevel:1VDC,highlevel5VDC):

Maximum pulse frequency:3kHz; duty cycle:about 5 0 %

HAR communication

Communication signal: HART communication signal ( 1 2 0 0 { H z } and 2 2 0 0 { H z } analog signals are superimposed on 4 { ~ } 2 0 { m A } DC signal);

Communication load resistance:250Ω;

Communication distance:up to 1km with multistranded cable. The communication distance varies accordingto the type of cable used.

Self-diagnosis and alarm output

Incaseofanalarm(outofrange,EEPROMerror and other abnormalities),an alarm output signal is generated and displayed.

Dataprotection function incase of powerloss

Data(parameters,accumulated flow,etc.) are saved in EEPROM,and spare battery is not required.

Damping time

Damping time is 5s\~2o0s,which can be set by keypad,and the minimum delay time is 5s

Linearcompensation function

Meterpolylinecorrection:5approximatepolylines can be used to correct and compensate the linear error of themeter.

Reynolds number compensation: The output error when the Reynolds numberislessthan 10,ooO can be compensated by5 approximate polylines.

Interchangeability

The converter can be used with sensors of various diameters.

Display

The low-power consumption 128x64 full-dotmatrixLCD isadopted,with clear and intuitive display;

Instantaneous flow, cumulative flow and percentage flow (expressed in % )canbe displayedat the same time; short message of self-diagnosis can be displayed,and output current,pulse and other information can be displayed by keypad.

Explosion-proof performance (please refer to GB3836.1,GB 3836.4 and GB3836.2 fordetailed explosion-proof parameters)

Explosion-proof grade:Exia II CT6 or Exdll Ct6; Ex indicates that the electrical equipment conforms
to the regulations on explosion-proof type; ia:intrinsically safe type category-a d explosion
proof type; IIC:electrical equipment for other explosive gas
environment except coal mine; T6:temperature group.

Smallsignal excision

Whenthe flowislower than the setlow flowvalue, the output is 4 { m A } or O pulse.

2.SelectionTableofVFDVibration-resistantTypeVortexFlowmeter Sensor Converter VFD Xxx 冈冈冈冈冈 区 网 冈 网 冈 区 区 冈 区 区 Main name Diameter:DN15\~DN600 Three digits:the first and second digitsof DN andthe number of zeros following thefirst two digits(unit:mm).DN125is special,whichis indicatedby121. Norminal pressuer 1:1.6MPa 2:2.5MPa 3:1.0MPa 4:ANSI150 5:40MPa 6:ANSI300 7:ANSI600 8:6.3MPa 9:Other A:10.0MPa Structure and material composition Materialcombinationsequence:body-generator-probe 2:HC-HC-HC 3:304-304-316L 4:304-316L-316L 5:316L-316L-HC 6:316L-316L-316L 7:316L-HC-HC 8:316L-HC-316L 9:Other Note:If2is selected,it is for theclamped flowmeter<DN80 only Measuring medium 1: Liquid 2: Gas 3: Steam Operating environment General places: ambient temperature:(-30\~70)℃ Hazardous places:ambient temperature:(-20\~60)℃ 1:Medium temperature:(-40\~120)℃ 2:Mediumtemperature:(40\~200)℃ 3:Mediumtemperature:(-40\~400)℃ Connection method 1:Clamped type3:Flangeconnectiontype4.Reducing type(one-level) 5:Reducingtype(two-level) 6:Double sensors(clamped type) 7:Double sensors (flange type) Note:Reducing type is for flange connection type only Accuracy grade A: Class 1.0 B: Class 0.75 (liquid) E:special Cablelength Split type: 1 0 { m } / 2 0 { m } / 3 0 { m } (10mbydefault) Integrated type: 00 Ifthereisanyspecialrequrement,pleaseindicatewhenordering,totalcablelength < 3 0 { m } Outgoing line seal 1:G1/2"internal thread 2:1/2"NPT internal thread 3:M20×1.5 Type VH: Integrated type VR: Split type Powersupply 1:24VDC Display assembly 2:With display Output signal 1:4\~20mA.DCoutaut,two-wire system 2 { : } 4 { ~ } 2 0 { m A } DC output and pulse output 3:with pulse outprut no 4 { * } 2 0 { m A } DC output Note:4-20mA.DCoutputand485communicationcannotbebothselected.Fortheconverterwith485communicationprotocl, 3.isrequired. Explosion-proof requirements 1:Generalplaces:notexplosion-proof2:Hazardousplace:intrisicallysafeexplosion-proof3:Hazardousplaceexplosion-proof Display direction 1: Standard direction Language 1: English Communication protocol 0:N/A 1: HART 2:Modbus(RS 485) Please explain when ordering.

OverviewofVFEIntelligentTypeVortex Flowmeter

1.ApplicableScopeofProduct

TheVFE intelligent type vortex flowmeter isa new generation of product with integrated real-time temperature and pressure compensation.The VFE intelligent type vortex flowmeter is equipped with temperature sensor and pressure sensor,which can measure fluid temperature and pressure in real time.In addition,the parameters such as operating flow, temperature and pressure can be converted into medium flow or standard flow,which can be settled easily.The VFE intelligent type vortex flowmeter has the characteristics of VFD vibration-resistant vortex flowmeter,which can measure accurately even when the pipevibration intensity isas high as 3 { g } and the flow rate is as low as 2 { m / s } ，TheVFE intelligent type vortex flowmeter has high stability and vibration resistance, and can be used in harsh operating environment.

2.ProductCharacteristics

measurement,representing high stability and super vibration resistance.

Highreliability

The reverse protection and purification technology isadopted for power supply，and the isolation technology is adopted for vortex signal processing,with super EMI immunity.

Low flow

The measurable lower limit flow rate of the instrument is as low as 2 { m / s } (liquid)

Wide range

The measurable range ratio is up to 1:50

Low-power consumption design

The operating current of the instrument is less than 4 { m A } ，and the total power consumption is less than 1 0 0 { m W }

Advanced FFT spectrum analysissignal processing technology

Theadvanced FFT technology is used to analyze and process the vortex flow signal,and able to accuratelydetectthe vortexinformationinthe areawith small signal and lowflow,which makes themeteralso havesuperstabilityandreliabilityinthelow flowarea, and greatly expands the measurable flow range of the meter,with a range ratio of up to 1:5

Highstabilityand vibrationresistance

The independent double sensor technology is adopted,one sensor detects the fluid flow information, and the other sensor detects the pipe vibration information.In case of pipeline vibration intensity up to 3 { g } ，themeter isable to automatically analyze the fluid flow condition in the pipeline and the vibration of the pipeline itself,and accuratelydetect the effective vortex signal in strong interference to achieve accurate

Real-time temperatureand pressurecompensation

The built-in temperature sensor and pressure sensor of the instrument can measure the temperature and pressure of fluid in real time,and the mass flow or standard flow can be measured through real-time temperature and pressure compensation,which can be used for trade settlement.

Temperature error: ± 1 ^ { \circ } { C } ,pressureaccuracy: ± 5 % FS

Simple parameter setting

The frequently used parameter combinations are put in one module,reducing the parameter setting time.

Concise and clear display

The instantaneous flow,cumulative flow, percentage flow (expressed in % ）and self-diagnosis information can be displayed simultaneously.

Local accuracy

± 5 % ofreading (the highest for liquid) ± 1 % of reading (gas and liquid) analog output 4 { ~ } 2 0 { m A } current output mode,which can be set by keypad.

Data protection in case of power loss

Data (parameters.accumulated values,etc.）are saved inEEPROM,and no spare batteryisrequired.

Metererrorcompensation

The meter error can be compensated by 5 approximate polylines (by setting 5 compensation coefficients).

Interchangeability

The converter can be used with sensors of various diameters.

Explosion-proof design

Explosion-proof standard: ExiaICT6orExdIICT6(NEPSIcertification).

Blockage-free design

Thewhole sensoris made of stainless steel,with simple and firm structure and without moving parts, avoiding holes,gaps and washers that are prone to failureasmuch aspossible.

Mechanical anti-vibration treatment

In the aspect of sensor, the vortex generator and probe are installed separately,and the probe adopts two main sampling piezoelectric wafers and two auxiliary sampling piezoelectric wafers.The signal detected by the probeisnot affected by the mechanical vibration of the vortex generator.

Simple fault handling

The sensor is easy to install,and the meter coefficient is constant.Thanks to high data repeatability, theconverter and sensor have good interchangeability, and the maintenance processisconvenient and fast.

OverallDimensionsofFlangeTypeVortexFlowmeter

Temperature and pressurecompensation

Temperature compensation