Smart Vortex Flowmeter

UserManual

目录

I、Matters need attention · U1

(1）Product Applications and Working Principle ·01
(2）Product Features ·02
(3）Essential Parameter ·03
(4)Structural dimensions and characteristics of the sensor ·04
Ⅱ、Flow Range Table ·08
II、Product Model and Selection Guidelines ·11
(1）Basic Selection Principles ·11
(2）Flow Range Matching Requirements ·11
(3）Pipeline diameter compatibility ·11
(4）Selection of Signal Output and Power Supply Methods ·11
(5）Media temperature and explosion-proof selection criteria ·12
V、Install ·13
(1）Precautions Before Installation ·13
(2）Precautions During Installation ·13
(3）Flange-mountedpipeline installation ·15
(4）Installationof an insert-type vortex flow meter ·15
V、Circuit Board Operation Instructions ·21
(1）Pulse Amplification Board (without display) ·21
(2）ESeries:Three-wire/Two-wire,Field Display Type ·21
(3）VT2W-XXA- Two-wire system with temperature and pressure
compensation ·26
(4)VT3W-XXA:A three-wire system for mixed signal processing,
featuring temperature and pressure compensation capabilities ·32
(5）Modbus communication ·42
VI、Appendix Steam Density Comparison Table ·44

Delivery Inspection

When you receive this product,please check for any damage or scratches during transportation.

Check the label on the product plaque to confirm it matches the model you wish to purchase.

Transportationand Storage

Avoid strong impacts during transportation and prevent exposure to rain. Use our company's packaging whenever possible to transport the flow meterdirectlytotheinstallationsite.

When storing,use the company's original packaging whenever possible.The storage locationmustmeet the following requirements:

No rain exposure

Avoid areaswith frequentvibration or impactasmuch as possible.

Temperature: \angle 4 0 ^ { \circ } C to + 5 5 ^ { \circ } C Humidity: 5 % to 90 %

When storing used flow meters,all residual liquids and adherent substances inside must be thoroughly removed.Additionally,ensure the sealing of the powerinterface to prevent moisture ingress.

Checkbeforeinstallation

Use the flow meter under the conditions specified. Using itbeyond these specifications is not recommended.If the flow meter becomes damaged,repair costs will be your responsibility.

If your flow meter malfunctions,contact us ora technician immediately to resolve the issue.

Read the instructionscarefullybefore installation.If the flowmeter is damaged due to improper operation,you will be responsible for repair costs.

1.1ProductApplicationsandWorkingPrinciple

1.1.1ProductUse

Thevortexflowmeterisavelocity-based flowmeasurement instrument widely used for flow monitoring and measurement in process pipelinesacross industries such as petroleum,chemical,power generation,metallurgy,heating, watersupply,wastewater treatment,and light industry.It provides stable and accuratevolumetricand cumulative flowmeasurements forclean media—including liquids,gases,saturated steam,and superheated steam-free from strong corrosion or significant solid particles.This instrument serves as a versatile flow measurement device for industrial process control,energy metering,energy consumption statistics,trade settlement,and process parameter monitoring.

1.1.2 OperationalPrinciple

The vortex streetflowmeter measures flow rate based on the fluid dynamics principlesof the Karman vortexstreet.Adedicated flowobstruction (vortex generator) is installed vertically within the fluid pipeline;when the fluid flows uniformly through it,regularand stable vortex rows—knownas Karman vortex streets-are alternately generated on both sides downstream of the generator. Within aspecific velocity range,the vortex shedding frequency exhibits a strict linearrelationshipwith the fluid velocityand remains unaffected byvariations in medium temperature,pressure,viscosity,ordensity.

Figure 1:Principle diagram of the Karman vortex street

The formula for the vortex shedding frequency isas follows: \mathsf { \Phi } _ { = \mathsf { S } \mathsf { t } ^ { \star } \mathsf { v } \mathsf { d } }

In the formula: f-Turbulence generation frequency (Hz); St一Strouhal constant (instrument calibration constant,stable and invariant); V-Fluid velocity in the pipeline ( \mathsf { m } / \mathsf { s } ) d一Characteristic width of the vortex generator (m).

The volumetricflow rate of a pipeline is proportional to both the flow velocity and the cross-sectional area of the pipe diameter.By detecting vortex frequency signals,the instantaneous volumetricflow rate can be accurately calculated,and the cumulative total flow rate can then be obtained through integration.

1.2ProductFeatures

1.No moving parts,ensuring reliable structure and low maintenance requirements. 2.Capable of measuring various media including gases,liquids,and steam, demonstrating strong versatility. 3.Low pressure loss,wide measurement range,and low operating costs. 4.Stabie measurement accuracy,with temperature and pressure compensation supportand multiple signal outputs. 5.Specific requirements apply to the installation of straight pipe sections; special optimization is required underlow-flow-rateand high-vibration conditions.

1.3Essentialparameter

1.4 Structural dimensions and characteristics of the sensor

The sensor consists of three components:the sensing element, the detection amplifier,and the connecting rod.Both the housing and its constituent parts,as well as the connecting rod,are fabricated from stainless steel,exhibiting excellent corrosion resistance and mechanical strength, ensuring stableand durable long-term performance.

Theinternal vortex generator and the outer casing are joined using gasshielded self-healing welding,ensuring high weld strength and a robust structure capable ofwithstanding industrial pipeline vibrations and pressure impacts.The detection probe and vortex generator feature a separate structural design,effectively addressing the instrument failure issues associated with traditional vortex flow meters caused by pressure guide hole blockages,thereby significantly enhancing long-termreliability in media containing impurities or prone to scaling.

The overall structural design and external dimensions of the sensorare shown in the dimension diagram:

Dimensiondiagramof the flange-mountedconnectiontypevortex flowmeter

Dimensionsof the flange-connected vortex flowmeter

Dimensionsofthethreaded-typevortexflowmeter

Dimensions of the clamp-connected vortex flowmeter

1.This size complies with the DIN 32676/ISO 2852 standard for sanitary clamps; other sizes are customized according to specific requirements. 2.The above-mentioned dimensions shall have a tolerance of ± 2 { \mathsf {mm } } ,andheight dimensions shall have a tolerance of ± 5 { \mathsf {mm } }

InsertionDepthTablefor InsertableVortexStreetFlowMeters

Simple-type flange connection; Flange ball valve type

Simple-type flange connection; Flange ball valve type

The selection of flowmeter diameter is critical and must adhere to specific principles:consider the maximum,common,and minimum flow rates of the measured fluid;the highest, common,and minimum pressures;the highest, common,and lowest temperatures;and ensure the flow measurement falls within the instrument's optimal operating range (i.e.,between 1/2and 2/3 of the upper flowrate).

Pour:

1.The flow range in the table covers from the minimum flow rate required for long-term stable operation of the instrumentto the maximum operating flow ratespecified forthe pipeline duringcustomer selection.

2.The gas flow rate in the table represents the volumetricflow rate under operatingconditions.

3.The flow rates of liquids and general gases are volumetric flows.To convertthemtomassflowrates,usethe followingformula:

{ \mathsf { Q } } { \mathsf { m } } = { \mathsf { Q } } { \mathsf { v } } x { \mathsf { \rho } } Where:

Qm:Mass flow rate of the test fluid ( \mathsf {kg } / \mathsf { h } ) （2 Q:The volumetric flow rate of the test fluid ( m ^ { 3 } / \mathsf { h } ) p:Operating density of the test fluid ( \mathsf {kg } / \mathsf { m } ^ { 3 } )

4.Steam measurement typically uses mass flow rate as the settlement unit.

The operating density must be determined based on known steam pressure and temperature,afterwhich the mass flow rate iscalculated from thevolumetric flow rate using theaforementioned formula.

SaturationSteamFlowRangeTable

Basic operating condition parameters

remarks

Medium:Saturated steam,all pressuresare absolute pressures; Flowrate for DN20-DN50: \boldsymbol { {kg / h } } ; for DN65-DN300:t/h. Qmin \mathbf { \Sigma } = \mathbf { \Sigma } minimum flow rate measurable by the instrument;Qmax \mathbf { \Sigma } = \mathbf { \Sigma } rated maximumflowrateofthe instrument.

3.1Basic SelectionPrinciples

Before selection,first determine the type of fluid to be measured and its operating flow range (which may be an estimated value).Then,based on the corresponding specifications for different fluids in the "Flow Range Table" provided in this manual,choose the appropriate vortex flowmeter model.

3.2FlowRange Matching Requirements

The actual flow rate of the measured medium within the pipeline must fall within the measurement range of the selected flow meter;otherwise, measurement accuracy and equipment safety cannot be guaranteed.It is recommended to maintaina long-term stableoperating flow rate between1/2 and 2/3 of the full measurement range to balance both accuracy and stability.

3.3Pipelinediametercompatibility

If the actual pipe diameter does not match the nominal diameter of the selected flow meter,adjust the pipe diameter using reduction or expansion techniques to ensure compatibility between the flow meter's diameterand operating flow conditions,thereby guaranteeing proper instrument operation.

3.4Selectionof Signal Outputand Power SupplyMethods

Select the signal output method based on the site application and installation conditions according to the following principles:

When measuring compressible fluids under conditions with significant variations in field medium temperature and pressure,it is recommended touse a vortex flow sensor equipped with pulse signal transmission capability,paired witha flow integrator featuring temperature and pressure compensation functions.The accompanying pressure transmittersand temperature transmitters (PT1oO) must be purchased separately by the user.

If the flow meter is installed in a well-conditioned indoor environment where signal transmission is unnecessary and on-site flow reading suffices,with the installation location facilitating operation and reading,a battery-powered direct-read vortex flow meter may be selected.For outdoor installations, battery-powered modelsare not recommended.

If the installation environment is poor,the location is inconvenient for onsitereading,or centralized management is required,itisrecommended to use a pulse-output sensor paired with a flow integrator,ora vortex flow transmitter withastandard 4 { * } 2 0 \mathsf { m A } current output.

When simultaneous on-site flowmeasurementand remote signal transmission are required,a vortex flow transmitter with direct on-site reading capability,along with 4 { * } 2 0 \mathsf { m A } output and RS485 communication functionality, is recommended.

When on-site reading is not required and only standard signals need to be transmitted remotely to the control system,a vortex flow transmitterwith a 4-20 mA standard current output is recommended.

3.5Media temperatureand explosion-proof selectioncriteria

Selecta vortex flowmetercorresponding to the temperature rangeof the measured medium:for temperatures between 2 5 0 ^ { \circ } C and 3 5 0 ^ { \circ } \mathsf C , use the hightemperature model (typically equipped with a heat dissipation structure).In explosion-proof environments,exclusively employ explosion-proof vortex flowmeters paired with intrinsically safe barriers orotherexplosion-proof equipment to ensure fullcompliance with explosion-proof standards.

4.1PrecautionsBeforelnstallation

4.1.1 scope of application

These installation proceduresapply to the installation of flow meters in this seriesdesigned forvortex-streak (steam) flowmeasurement.

4.1.2Upon arrival inspection

Upon delivery,verify each instrument's quantity,model,and nominal diameter individually,and inspect the instrumentbody forany damage or deformation.

4.1.3AttachmentCount

Upon opening the box,inspect allaccompanying accessories:flanges,bolts, nuts,sealing gaskets,product manuals,and quality certificates should be complete and in good condition.

4.1.4MaterialReading

Before formal installation,please read thismanual thoroughly.Forany technical questions,contact our after-sales support team promptly.

4.2PrecautionsDuring lnstallation

1.Each flowmeter hasa specificapplication range; please verify before installation that the purchased unit meets the site's operating conditions (flow rate,temperature,pressure).

2.The vortex flowmeter can measure liquids,gases,and steam,but it is not interchangeable between different media;for the same medium,it isavailable in three specifications (low-temperature,medium-temperature,and hightemperature),and italso lackscompatibilityacrossdifferent temperature ranges.

3.Avoid exposure to high-voltage equipment,high-frequency devices,and powerful switching power supplieswhenever possible.The power supply for instruments should be isolated from these devicesasmuch as feasible.

4.Avoid direct exposure to high-temperature heat sourcesand radiation sources.If installationisunavoidable,thermalinsulationand ventilation measuresmustbeimplemented.

5.Avoid high-humidity environments and areas with strong corrosive gases. If installation is necessary,adequate ventilation measures mustbe implemented.

6.Explosion-proof sensors and transmitters must be installed in hazardous areas,while associated equipment such as safety barriers,display instruments, powersupplies,and computers shall be installed in safe locations.Sensors and transmitters require reliable grounding;the explosion-proof ground wire must not share the protective grounding of high-voltage electrical systems.

7.Flow meters should preferably not be installed on long overhead pipelines,as pipeline sagging can easily cause sealing leaks between the flow meterand its flange.If installation is unavoidable,support pointsmust be provided at both upstream and downstream positions of the flow meter along the pipeline.

8.Vortex flow meters should be avoided when installed on pipelines subject to significant vibration.If installation is unavoidable,pipeline securing devices mustbe installed at both upstream and downstream positions along the 2D section,accompanied by vibration isolation pads,supports,or flexible hoses to enhance vibration resistance.

9.The instrument should preferably be installed indoors.When installed outdoors,measures must be taken to ensure waterproofing,moisture resistance, and sun protection.Special attention should be paid to bending the cable into a " \mathsf { U } ^ { \ast } shape at electrical interfaces to prevent water from entering the amplifier housing through the cable.

10.The pipeline where the flow meter is installed must comply with the straight pipe sections specified in this manual; failure to do so may compromise the measurement accuracy of the flow meterand,in severe cases,cause damage to the device.

11.During flow meter installation,the device must not be placed on the pipeline while welding flanges or connecting pipes to prevent damage to its internal components.

12.Flow meters can be installed on either horizontal orvertical pipelines. When installed on a vertical pipeline and measuring a liquid medium,the fluid must flow from bottom to top.

13.Flow meters should not be installed too close to valve outlets,as valve operation may compromise the meter'sservice life and,in severe cases,cause damage.To facilitate maintenance,a bypass pipeline must be installed, particularly in processes where fluid flow cannot be interrupted mid-process.

14.Before operating the flow meter,carefully verify that its installation and wiring are correct.

15.After powering on,check if the LCD screen displaysany flow indication.

16.Gradually open thevalve forat least 2minutesuntil reachinga lower pressure level,then stop.Check forany leaksaround the sensorand verify that theLCD screen displays proper flow rate.If everything is normal,fully open the valve,allow it to stabilize fora period,and confirm the displayed flow rate remainsaccurate.

17.Users must follow the instructions and warnings in this user manual to ensure properand safe operation of the instrument.

4.3Flange-mountedpipelineinstallation

Flow meter;Metal winding gasket for flanges; Pipeline nuts;Bolt washers Perform spot welding to position the flange and pipeline.

Remove the flow meter,weld the flange as specified,and clean all protruding partsinside the pipeline.

Install a sealing gasket with the same diameter as the pipeline within the innergroove of the flange,then mount the flow meter inside the flange.

The flow indicator on the meter must align with the fluid direction and be securelyfastenedwithbolts.

4.4lnstallationof an insert-type vortexflow meter

Use gas welding to create a 9 0 ~ \mathsf {mm } circular hole in the pipeline,and thoroughly remove all burrs around the hole to ensure smooth rotation of the probe.

Weld the manufacturer-provided flange onto the circular pipe opening, ensuring itsaxis is perpendicular to the pipe axis.

nstall the ball valve and sensoron the welded flange.

The fluid flow direction must match the arrow indicated on the flowlabel. Tighten the fixing bolts and nuts uniformly between the flanges and the ball valve.

Check whether each step has been properly completed,then slowly open the valve to observe forany leaks (special attention mustbe paid to personal safety). If there isa leak,repeat the previous step.

Installation Requirements for Instrument Pipelines:Turbulent flow meters have specific requirements for the straight pipe sections upstreamand downstream of the installation point; failure to meet these requirements may impairfluid flow within the pipeline and compromise measurement accuracy. The required lengths of straight pipe sections upstream and downstream of the instrument are as follows:

Concentrically shaped fully open valve with two 90-degree elbows on different planes

Concentrically shaped fully open valve with two 90-degree elbows on different planes

A90-degree elbow with concentric pipe expansion A90-degree elbow with concentric pipe expansion

Two 90-degree elbows on the same plane; control valve in half-open position (not recommended)

Two 90-degree elbows on the same plane; control valve in half-open position (not recommended)Pour:

DNis the instrument diameter,in mm

The control valve should preferably notbe installed upstream of the vortex flowmeterbut rather10Ddownstreamof it.

The inner diameters of upstream and downstream pipelines must be identical.If discrepancies exist,the pipeline inner diameter Dpand the vortex flow meter's housing inner diameter Db mustsatisfy the following relationship: 0 . 9 8 \mathsf { D b } \le \mathsf { D p } \le 1 . 0 5 \bar { \mathsf { D b } } .Both upstream and downstream pipelines shall be compatible with the flow meter housing.

The innerdiametersare concentric,and the difference in theiraxial dimensionsshouldbelessthanO.05dB.

The sealing gasket between the instrument and the flange must not protrude into the tube during installation;its inner diameter should be larger than that of the instrument body 1 - 2mm ￥

Installation design for pressure and temperature measurement ports:When temperature and pressure transmittersare required for the pipeline under measurement,the pressure measurement port should be located 3-5D downstream,while the temperature measurement port should be positioned 6-8D downstream.Special attention must be paid to insulation measures when measuring high-temperature or low-temperature fluids.Theinternal temperature within the converter (within the meter head housing) should generally not exceed 7 0 ^ { \circ } C ; excessively low temperatures may cause condensation inside the converter,reducing the insulation impedance of the printed circuit board and impairing normalinstrument operation.

Ata higher point along the pipeline,as shown in the figure The instrument can be installed horizontally, vertically,or at an angle on the pipeline.

On horizontal pipelines,when measuring gas containing trace amounts of liquid,the flow meter should be installed at a higher point on the pipeline,as shown in the figure.

For horizontal pipelines,when measuring liquids containing trace amounts of gas,the flow meter should be installed at the lowest point of the pipeline,as shown in the figure.

When measuring gas in a vertical pipeline,instruments are installed along the pipeline with no restriction on gas flow direction.However,if the pipeline containsa small amount of liquid,the gas flow should move upward from the bottom to prevent liquid from entering the instrument's measurement tube.For measuring liquid flow,the liquid must flow upward from the bottom,as shown in the figure.

4.4.1InstallationRequirements

The installation site must be free from severe vibrations and strong magnetic interference.In the presence of intense vibrations,vibration mitigation measures should be implemented,such as using vibration-damping supportsor flexible rubber shock-absorbing pads.

The installation site must ensure convenient conditions for installation and maintenanceoperations.

The area surrounding the installation site must not be filled with corrosive gases and must not be at risk of water inundation.

The vortex flowmeter displayed on-site must not be directly exposed to sunlight or intense solar radiation;in such cases,necessary shading measures should be implemented.

The direction of the flow arrow on the vortex flowmeter must align with the direction of fluid flow within the pipeline.

When measuring liquids,ensure the pipeline is fully filled.When vertical installation is required,the fluid must flow from bottom to top.

Aflow control valve should not be installed upstream of the flow meter; instead,it should be placed downstream.

The upstream and downstream sections of a vortex flowmeter must be equipped with straight pipe segments of sufficient length according to the actual site conditions.

way to install

For split-type systems with temperature and pressure compensation, the installation requires both a pressure transmitter and a temperature transmitter when pressure or temperature compensation is needed.The pressure tapping hole should be located 3-5 DN downstream of the sensor,with a diameter of 3 - 1 3 ~ \mathsf {mm } .The temperature measurement point should be positioned 6-8 DN downstream of the sensor.

When installing a flanged vortex flowmeter on a pipeline,to ensure accurate and reliable installation,first bolt the flowmeterand theflanged fitting together, then weld the flanged fitting to the pipeline.To prevent damage to the flowmeter caused by excessive temperature duringwelding,perform spot welding first,then remove the flowmeter before proceeding with welding.To facilitate maintenance and inspection,a bypass pipe may be installed on the outer side of the straight pipe sections upstream and downstream of the vortex flowmeter to prevent interference with its measurement performance.

Illustration of the installation diagram for split-type temperatureand pressure compensationsystem

This product comes with four types of matching circuit boards.Select the appropriate board type for your purchased instrumentand follow the instructions in the corresponding section.

1.Pulse Amplification Board (without display) 2.ESeries:Three-wire/Two-wire,FieldDisplay Type 3.VT2W-XXA-Two-wire systemwith temperature and pressure compensation 4.VT3W-XXA:A three-wire system for mixed signal processing, featuring temperature and pressure compensation capabilities.

5.1PulseAmplificationBoard(withoutdisplay)

This board lacksdisplay functionality and isdesigned for use with secondary instruments such as flowaccumulators and paperless recorders that feature pulse input capabilities.

Line Connection Definition

V+:Positive terminal of the external DC 24V power supply Error:Pulse signal output port GND:Negative terminal of the power supply; common ground for pulse utput

5.2ESeries:Three-wire/Two-wire,Field DisplayType

This board lacks temperature and pressure compensation functions,making it suitable for measuring volumetric flow rates in liquid and gas applications.

Screen Display Instructions

After power-on,the device displays all data in four rows.The format and meaningsareasfollows:

First row:Cumulative flow.Maximum of9 digits (including 3decimal places); theunitmatches thatof instantaneous flow.

Second row:Instantaneous flow rate,rounded to two decimal places.

Third row: Frequency data,format \mathsf { F } = \mathsf { X } \mathsf { X } \mathsf { X } \mathsf { X } . \mathsf { X } \mathsf { H } z , with1decimal place retained;

Displays F L = X X . X H z ：indicates triggering the removal of the flowlower limit;

Displays F C 5 = 0 . 0 H z ：indicateseliminationof 5 0 / 6 0 \mathsf { H z } powerfrequency interference.

Fourth row:Current output value,format 1 = x x . x x m A with2decimal places.

LineWiring Definition

2 4 \lor + ：Positive input ofaDC24V power supply 24V-:Negative input terminal of the DC 24V power supply/Common point for \mathsf { V } + /Fo:Pulse circuit DC 24V positive input Error:Pulse signal output port GND:Negative input of the DC 24V pulse circuit

two-wire current output

Note:The pulse output requires proper power supply from the main current circuit to operate;it deliversan optically isolated raw pulse (uncalibrated) and is primarily used for instrument calibration.The signal type isan NPN collectoropen outputwitha built-in 2 1 x \Omega pull-up resistor.

Run Interface Switch

Afterpower is turned on,the instrument first performsa self-testand then enters the main display mode on Screen 1.

Figure 1: Interface of the VT2WE Two-Line Working Screen 1

Use the " < " or"+"key to switch between Work Screen2and Work Screen 1

Chart1:Two WorkScreen Interfaces

User Parameter Settings

Button Function Definitions

Long press the ^ + key(1 second) = { \sf S } key: Exit current input/modification state

Long press the <key(1 second) = \mathtt { E } key to confirm and save settings Short press the ^ + key to switch cursor position between numbers and options

Short press the <key to move the cursor right

Data input supports up to 8 digits (including symbols and decimal points)

BasicMenu Operations

Menu navigation:Press the ^ + key to scroll down,press the <key to scroll up; press Eto entera submenu,pressS to return to the main interface.

Submenu Operations: Press S to exit the submenu; press E to enter edit mode.

Optionmodification:Use the ^ + keyto select downward,the<keyto select upward,and theEkeyto confirm.

Number modification: Enter data according to the above key rules and press E to confirm.

Important:Aftermodifying parameters,press the Ekey to save;otherwise, the settings will be invalid.

ParameterMenuOverviewTable

Enterthedefault password inthe parametermenu:22

5.3VT2W-XXA-Two-wire system with temperature and pressure compensation

This product features temperature and pressure compensation capabilities, enabling measurement of volumetric flow ratesunderworking conditions for liquids,gases,and steam,as well as standard-state volumetric flow rates for gases and mass flow rates forsteam.Italso includes Hart communication functionality.The specificdetails regarding temperature and pressure compensation and Hart communication capabilities are subject to the actual product specifications.

video display

The first row shows cumulative flow.
The second row displays the instantaneous flowrate.
The third row displays the temperature value.
The fourth row displays the pressure value.

Line Wiring

mA ^ + ：24VDC+power input
mA-:24VDC power input;two-wire
currentoutput
\mathsf { V } + ：Pulse input of24VDC
Error:Pulse output
Vss:Pulse inputof24VDC TRH:PT100 Input
TRL: PT100 Input
PIH:Pressure signal voltage input ^ + PVH:Pressure-powered output ^ +
PVL:Pressure Power Supply OutputPIL: Pressure signal voltage input

FlowMeterWorkInterface

The flow meter's operation interface consists of two sections: the main interface and the auxiliary interface,as shown in the figure.

Cumulative flow→ 1000000.0m3 Instantaneous flow→ 1000.0 instantaneous m3/h flowunit Medium temperature→ T=25.5℃ Medium pressure→ P=101.3KPa flowpercentageChart1MainWork Interface Signal frequency- Fin=500.0Hz Output current value一 Iout=12.000mA Output frequencyvalue- Fout=500.00Hz Enter password box- Password:00

User ParameterSettings

Button Function Definitions

Long press the ^ + key(1 second) = { \sf S } key: Exit current input/modification state

Long press the <key(1 second) = E key to confirm and save settings Short press the ^ + key to switch cursor position between numbers and options

Short press the <key to move the cursor right

Data inputsupports up to8 digits (including symbolsand decimal points)

BasicMenuOperations

Menu navigation:Press the ^ + key to scroll down, press the <key to scroll up; pressEtoenterasubmenu,pressSto returnto themain interface.

Submenu Operations:Press S to exit the submenu; press Eto enter edit mode.

Option modification: Use the ^ + key to select downward, the<key to select upward,and the E key to confirm.

Number modification: Enter data according to the above key rules and press :to confirm.

Important:After modifying parameters,press the Ekey to save;otherwise, thesettingswillbe invalid.

When entering your password in the auxiliary interface,type "22" to accesstheusermenu.Themenustructureisshownbelow.

The functions of each menu and their parameter meanings are shown in the table below:

HARTCOMMUNICATION

The transmitter supports two-wire 4 { * } 2 0 \mathsf { m A } communication for the general HART commands listed in the table below.

5.4VT3W-XXA:Athree-wire system formixed signal processing, featuring temperatureand pressure compensationcapabilities.

This product features temperature and pressure compensation capabilities, enabling measurementof volumetric flow rates under liquid,gas,and steam conditions,aswell as standard-state volumetricflow rates for gases and mass flow rates for steam,along with RS485 communication functionality.The specific specifications for temperature/pressure compensation and RS485 communication are subject to the actual product model.It operates on a 3.6V lithium battery and retains its RS485 communication capability when powered bybattery.

Display content

The power supply icon shows a "plug" symbol for mains power and a 0.243n3 "battery"symbolfor 0.000 battery power. Pu=2. m3/h H

The first row shows cumulative flow. The second row displays the
instantaneous flowrate.
The third row displays the temperature value.

Line Wiring

The fourth row displays the pressure value.
Nrepresents the signal measurement mode;
default value.
\mathsf { V } + ：Powerinputof24VDC+
GND:Power input (24VDC-)
IOUT:Three-wire current output
Fout: Three-line pulse output
\mathsf { A } + ：RS485communication A
B-:RS485 Communication B
TRH: PT100 Input
TRL: PT100 Input
PIH:Pressure signal voltage input ^ +

PVH:Pressure-powered output ^ + PVL:Pressure Power Supply OutputPIL: Pressure signal voltage input{ 3 . 6 \lor + } ：Positiveterminalofa3.6Vbattery 3.6V-:The negative terminal of a 3.6Vbattery

FlowMeterWorkInterface

The flow meter's operation interface consists of two sections: the main interfaceand theauxiliary interface,asshown in the figure.

Cumulative flow 1000000.0m3
Instantaneous flow 1000.0 m3/h ←Instantaneous flow unit
Medium temperature- T=25.5℃ Medium pressure P=101.3KPa Flow% L ←Power supply mode Signal calibration mode

Signal frequency-→ Fin=500.0Hz Output current value一 Iout=12.000mA Output frequency value→ Fout=500.00Hz Enter password box Password:00

User ParameterSettings

ButtonFunctionDefinitions

Long press the ^ + key (1 second) = { 5 } key: Exit current input/modification state

Long press the <key(1 second) \mathbf { \Psi } = \mathsf { E } key to confirm and save settings Short press the ^ + key to switch cursor position between numbers and options

Short press the <key to move the cursor right

Data input supports up to 8 digits (including symbols and decimal points)

BasicMenu Operations

Menu navigation: Press the ^ + key to scroll down,press the <key to scroll up; press E to entera submenu,pressS to return to the main interface.

Submenu Operations: Press S to exit the submenu; press E to enteredit mode.

Optionmodification:Use the ^ + key to select downward,the<keyto select upward,and the E key to confirm.

Number modification: Enter data according to the above key rules and press E to confirm.

Important:After modifying parameters,press the Ekey to save;otherwise, the settingswill be invalid.

UserMenu

Enter the password "22"to access the user menu.The functions and parameter meaningsof each menu itemare as follows:Table1 UserMenu

Engineer Menu: Enter the password "33"to access the EngineerMenu. The functions and parameter meanings of each menu are listed in the table below:

Settings Menu (the key menu that directly determines the instrument's critical performance)When in password entrymode,enter the password "44" to access the settings menu.The functions and parameter meanings of eachmenuare listedbelow:

Note:All settings in the menu are strictly calibrated or configured at the flow meter's factory.Non-professionals or users without specialized equipment must not modify or recalibrate these settings,as doing so may cause the flow meter to malfunction.

5.5Modbuscommunication

The three-wire transmitter rapidly reads each operating parameter from the hold registers using the Modbus-RTU communication protocol.The only Modbus command that reads hold register values is Command 3.It supports only 4800 and 96o0 baud rateswith a response time of <= 5 0 { \ m s } _ { i } ：theminimum intervalbetweenconsecutiveModbuscommands is 1 0 0 ~ \mathsf { m s }

Table5 provides explanations for the offsetaddressesand data formats of each valuein Modbuscommands.

Regarding Cumulative Amount:The cumulative amount consists of two parts:a high-orderbitand alow-orderbit.Thelow-orderbit isa fixed-point integer.After converting thisdata to decimal,the high-orderbit is the integer value of the cumulative amount divided by1,0oo,ooo.The calculation formula is:

Cumulative Amount (Floating-Point) \mathbf { \tau } = \mathbf { \tau } High-order Bit (Integer) \* 1 , 0 0 0 , 0 0 0 . 0 \ + Low-order Bit (Integer)/1,000.0

The cumulative flow unit is the volume or mass unit remaining after removing the time portion from the instantaneous flow unit.

Regarding flow unit codes,a flow unit is the physical unit determined by matching its sequence code value with the table below.

Fordetailed information on Modbus commandsand message formats,refer to the Modbus White Paper and other protocol specifications.

explain

This table applies to temperature-pressure compensation and mass flow conversion scenarios forvortex flow meters.

Pressure unit:MPa (absolute pressure); Temperature unit: { } ^ { \circ } { \mathsf { C } } ; Density unit: \mathsf {kg } / \mathsf { m } ^ { 3 } （204号

The density of saturated steam is determined solely by pressure;the density of superheated steam isdetermined by both pressure and temperature.

Thevalues in the table are commonly used engineering reference values; on-site parameter settings can be directly referenced.

SaturationSteamDensityTable1

Overheated Steam Density Table 4

Direction For Use

Units in this table:absolute pressure \left( \mathsf { p } / \mathsf { M P a } \right) ,temperature ( { \sf t } / { } ^ { \circ } { \sf C } ) and density ( \mathsf {kg } / \mathsf { m } ^ { 3 } ) .These valuescan be directlyused for temperature-pressure compensation of superheated steam in vortex flow metersand for mass flow conversion.

If the on-site operating condition is gauge pressure,convert it to absolute pressure (absolute pressure \mathbf { \tau } = \mathbf { \tau } gauge pressure + 0 . 1 0 1 3 { \mathsf { M P a } } andrefer to the table accordingly.

In the table, " - " indicates that the temperature at this pressure is below the saturationtemperatureand thereisnosuperheatedsteamstate.

NOTICESANDDISCLAIMERS

1.Technical Upgrade Notice

This manualis prepared based on the technical information available at the time of publicationand is intended solely asareference for product installation, commissioning,operation,andmaintenance.

In order to continuously improve product performance,reliability,and user experience,ZHEJIANG LEFOO CONTROLS CO.,LTD.reserves the right to optimize and upgrade product structures,software programs,functional configurations, communication protocols,technical specifications,and related documentation without prior notice,provided that the basic functions,key technical specifications,and contractual requirements of the product are not affected.

The illustrations,interface displays,menus,parameters,and diagrams contained in this manual are for reference only.The actual product configuration shall be subject to the sales contract, product nameplate,factory inspection documents,and the delivered product.

For the latest product information and documentation,please contact the technical service department of ZHEJIANG LEFOO CONTROLS CO., LTD.

2.Dimensions and Drawings Notice

The outline drawings,installation drawings,structural diagrams,and dimensional data contained in this manual are standard reference information intended for engineering design,installation,and product selection purposes only.

Due to factors such as product model, nominal size,optional configurations, manufacturing processes,raw material batches,and machining tolerances, the actual dimensions,installation dimensions,and structural detailsof the delivered product may differ slightly from those shown in this manual.

Unless otherwise specified,dimensionaltolerances are considered normal manufacturing variations and shall notbe regarded as product defects or quality issues.

For projects involving prefabricated piping,flange positioning,limited installation space,orotherspecial installationrequirements,customersare advised to obtain the latest approved drawings from our company prior to construction.The officially approved technical documents or the actual delivered product shall prevail.

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No partof this publication may be reproduced,copied,modified, distributed,or used for commercial purposes without prior written authorization from ZHEJIANG LEFOO CONTROLS CO., LTD.

Formatters not covered in thismanual, the sales contract, technical agreement,and applicable national or international standards shall prevail. (Subjectto revision.The latest released version shall prevail.)