Bell VFM60 Series Manuale di riferimento

VFM60 Series

Vortex Flowmeter

Introduction Manual

VFM-60

Vortex Flowmeter

Rev1.3

Date:24/04/2020 User’s Manual

2 / 59

CONTENTS

Support................................................................................................................................................2

Place an order ..................................................................................................................................2

1 General.....................................................................................................................................4

1.1 Model Number and General Specification...........................................................................4

1.2 Packing List...........................................................................................................................4

1.3 Storage...................................................................................................................................4

1.4 HazardousArea Installation:.................................................................................................4

1.5 Measuring principle:.............................................................................................................5

2 Installation........................................................................................................................................6

2.1 Find Most Suitable Location.................................................................................................6

2.2 Requirement on straight pipe line.........................................................................................6

3 Wiring.............................................................................................................................................10

3.1 Wiring for 5-terminal board................................................................................................11

3.1.1 Wiring for 3 wire pulse output.................................................................................11

3.1.2 Wiring for 2 wire HART@4~20mA........................................................................11

3.1.3 Wiring for RS485.....................................................................................................12

3.2 Wiring for 12-terminal board..............................................................................................12

3.2.1 Wiring for 3 wire pulse output.................................................................................12

3.2.2 Wiring for 4 wire 4~20mA......................................................................................13

3.2.3 Wiring for 4 wire HART@4~20mA........................................................................13

3.2.4 Wiring for RS485.....................................................................................................14

3.3 Shell grounding and elimination of interference................................................................14

3.4 Requirement on wiring .......................................................................................................14

4 Display ...........................................................................................................................................15

4.1 Intruction of multi-functional LCD display........................................................................15

4.2 Unit of the variable displayed.............................................................................................17

4.3 Three button setting ............................................................................................................17

4.4 Total flow displaying ..........................................................................................................18

4.5 Status...................................................................................................................................19

5 Setting.............................................................................................................................................19

5.1 How to set ...........................................................................................................................19

5.1.1 Code setting .............................................................................................................19

5.1.2 Digital setting...........................................................................................................20

5.2 Setting list ...........................................................................................................................21

5.3 Example of setting ..............................................................................................................26

5.4 Password setting instruction...............................................................................................26

6 Instruction of RS485 Modbus Communication.............................................................................27

6.1 Interface regulation.............................................................................................................27

6.2 Commends ..........................................................................................................................29

6.3 Calculation of CRC parity code..........................................................................................30

6.4 The float date format of the instrument..............................................................................31

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6.5 The sequence of the float date bytes of instrument............................................................31

6.6 Modbus error reponse.........................................................................................................32

6.7 Examples of communication ..............................................................................................33

7 Introduction of HART communication protocol ...........................................................................34

7.1 HART commands................................................................................................................34

7.1.1 Command 0:Read transmitter unique identifier......................................................34

7.1.2 Command 1: Read primary variable value (PV).....................................................34

7.1.3 Command 2:Read primary variable’s current and percentage value ......................35

7.1.4 Command 3:Read primary variable current and dynamic variables.......................35

7.1.5 Command 6:Write polling address..........................................................................36

7.1.6 Command 11:Read unique identifier associated with tag.......................................36

7.1.7 Command 12:Read message....................................................................................37

7.1.8 Command 13:Read tag, descriptor, date..................................................................37

7.1.9 Command 14:Read primary variable sensor information: device serial number and

limits..................................................................................................................................38

7.1.10 Command 15: Read primary variable output information....................................38

7.1.11 Command 16: Read final assembly number..........................................................39

7.1.12 Command 17: Write message................................................................................39

7.1.13 Command 18: Write tag, descriptor, date..............................................................39

7.1.14 Command 19: Write final assembly number.........................................................40

7.1.15 Command 34: Write primary variable damping value..........................................40

7.1.16 Command 35: Write primary variable range values..............................................40

7.1.17 Command 36: Write primary variable upper limit value ......................................41

7.1.18 Command 37: Write primary variable lower limit value ......................................41

7.1.19 Command 40: Enter/Exit primary variable current mode.....................................42

7.1.20 Command 45: Trim primary variable current DAC zero......................................42

7.1.21 Command 46: Trim primary variable current DAC gain......................................43

7.1.22 Command 140: Reset totalizer ..............................................................................43

8 Maintaining....................................................................................................................................43

8.1 How to reverse the transmitter front and back ...................................................................43

8.2 Replace a transmitter circuit boards ...................................................................................44

9 Troubleshooting and repair............................................................................................................44

9.1 Safty introduction................................................................................................................44

9.2 Troubleshooting and repair.................................................................................................45

9.3 Self-diagnose funcstion.......................................................................................................46

10 Remark.........................................................................................................................................47

Appendix...........................................................................................................................................48

VFM-60

Vortex Flowmeter

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1 General

Every VFM60 vortex flowmeter will be carefully inspected before delivered to users.

Please carefully check if there is any damage on the package and product when you received them

Please check if the package contains all the accessories according to 1.2 or your purchase order.

Please make sure the person in charge of this device has carefully read this manual and understand its

descriptions.

1.1 Model Number and General Specification

Please check if the model number and specifications on the name plate match your requirement on the

purchase order.

Please kindly record the model number and instrument ID code, which will be required if you need and

service or support from us.

1.2 Packing List

When you recived the package, please check if it contains the items as below:

VFM60 vortex flowmeter x1

User’s manual x1

Calibration certificate x1

Quality certificate x1

Cable (For remote type only, length according to customer’s requirement)

Counter flanges (For wafer type, or for flanged type when customer requied so)

Screws and bolt (For wafer type, or for flanged type when customer requied so)

1.3 Storage

If the product needs to be stored for a long period before use, please be awared of below:

(1) The product should be kept in the origin package and same as it was when received.

(2) Please store the product in a proper location according to the requirements below:

Not in a uncovered field.

Not in a location where could have great vibration.

Please keep the enclosure of the meter closed.

The ambient temperature, atmospheric pressure and humidity should be:

Temperature:

-20~+60℃

；RH：

5%~99%

；Pressure：

86~106Kpa

1.4 Hazardous Area Installation:

Our vortex flowmeter can be installed in hazardous area according to the approval below:

Exd IICT3 (NEPSI) NOT EUROPE or USA

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1.5 Measuring principle:

Vortex flowmeter measures the flow by sensing the vortices in the flow according to “Karman Vortex

Street”. When put an shedder in the path of flow, vortices are alternately shed on each side (see picture

1.2)

1.2 Von Karman vortices

The frequency of vortices (f) is in direct ratio with velocity of flow (v) and in inverse ratio with width

of obstacle (d).

f=St*v/d (formula 1)

v=fd/St (formula 2)

St is Strouhal Number, is a dimensionless constant related to shape of the shdder, which can be get by

testing. St is Strouhal Number, is a dimensionless constant related to shape of the shedder, which can

be get by test.

Because d and St is constant, flow velocity (v) and average velocity (v0) also have certain relationship

( v0=v/(1-1.25d/D) ), so, you could get v0 by having the frequency of vortices shedding (f) , and then

get the mass flow. The ration between quantity of vortex in a certain period of time and the volume of

the flow pass by is called coefficient of the instrument (K)

K=N/V (formula 3)

VFM60 series digital vortex flowmeter is designed to provide most reliable performence. This series of

vortex flowmeter is designed on PA60 plateform. Every part utilized is universal for all VFM60 series

products. The circuit boards use signal isolation and self-diagnose technology. VFM60 series utilize

spectrum analizing signal process technology, which ensured lower under measuring limit and better

turndown ratio. The enhanced version uses unique dual-sensor design and vibration signal analyzing

technology to improve its anti-vibration cabability and provide with more stable reading. VFM60 also

has density calculation function as option, which means it can calculate the density and measure mass

flow rate of air/satureated steam/superheated steam without secondary device. It also has AGA-NX-19

and AGA-8 algorithm to measure natural gas directly.

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2 Installation

2.1 Find Most Suitable Location

(1) Ambient temperature

Please avoid installing the flowmeter at a location where temperature could dramaticly changes. If

the meter is under heavy heat radiation, please implement effective heat insulation and venting method.

(2) Atomosphere

Please do not install the meter at a locaition where the atomosphere contains a high level of

corrosive substance. If can not install the meter at a better location, please make sure there is enough

venting.

(3) Vibration

The meter should not be installed at a location where could have strong vibration. If the mounting

pipeline could have heavy vibration, the pipe line should be hold steady by some support racks.

(4) Caution

(a) All screws and bolts should be tighen.

(b) Make sure there is not leakage point on the connection.

(d) Once the meter is under pressure, please do not screw the bolts and screws.

2.2 Requirement on straight pipe line

Standard

Down sized

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Upsized

Curve pipeline

Dual-curve pipeline

Steam measurement

(Only allow

installation in

shadow areas)

when medium over 150°C(302°F),

recommend flow meter installs

vertical to the pipeline (as picture), or

install on a horizontal pipe, flow

meter recommend to install in the

shadow areas.

Valve in

downstream

Valve in upstream

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Pressure

sensor:2~7D

downstream of

flowmeter

Temperature

sensor: 1~2D

downstream of

pressure sensor

Roots blower or

piston blower or air

compressor in

upstream

Roots blower or piston blower or air compressor or pump in upstream, could

cause vibration of the fluid itself. To eliminate this vibration, please install a

orifice plate or a upsized pipe at about 25D upstream the meter. The valve

should be located downstream the flowmeter in this condition

After a piston pump

Please install a accumulator to reduce the vibration

T type pipeline in

upstream

When upstream pipe line is T typethe flowmeter and a valve downstream the

meter is shut (see above picture), the fluid will all flow towards direct B, but

the meter may still have reading for it may be detecting the pulsating

pressure. Please move the valve to upstream of the meter to avoid this

situition

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Gaskets should not

get into the pipeline

Heat insulation: If

the fluid is in high

temperature, the heat

insulation material

should not cover the

heat dissipation hole

on flow meter

Pipe cleaning: If

thepipeline need to be

cleaned, please use a

subtitied pipe to

replace the flowmeter

to invoid the meter

being damaged by the

cleaning fluid

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Vortex Flowmeter

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3 Wiring

VFM60 vortex flowmeter has 2 different terminal boards, the 5-terminals board and the 12

terminals board, please reference to picture 3.1 and 3.2 below.

V+ V- A B

Picture 3.1 5-terminals board

V+ V- RT3

RT2RT1

I-

I+ A B

P-

P+

Picture 3.2 12-terminals board

On above boards, V+ and V- are for power. is pulse output terminal. A, B are “+” and “-” for

RS485Modbus communication, I+ and I- are + and –for 3-wire or 4-wire 4~20 mA.RT1, RT2, RT3 are

for separate RTD. P+,P- are for pressure transmitter . VFM60 multi –variable version has built in RTD

and pressure sensor, so clients are not required to wire for temperature or pressure compensation.

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