AFLOWT BUF Manuel utilisateur

BATTERY POWERED

ULTRASONIC FLOW METER

AFLOWT BUF

VERSION

BUF-311

OPERATION MANUAL

ISO 9001:2008

* * *

Manufacturer quality management system is certified to

ISO 9001:2008

* * *

URL: http://www.aflowt.com

TABLE OF CONTENTS Page

INTRODUCTION.....................................................................................................4

1. DESCRIPTION AND OPERATION.....................................................................5

1.1. Application.............................................................................................5

1.2 Specifications..........................................................................................6

1.3. Contents of the delivery package...........................................................7

1.4. Design and operation.............................................................................8

1.4.1. Operation principle .......................................................................8

1.4.2. Design ..........................................................................................9

1.4.3. Operating modes........................................................................10

1.4.4. Displaying measurement results.................................................11

1.4.5. External connections ..................................................................12

1.4.6. Logging.......................................................................................13

1.5. Design..................................................................................................14

1.6. Marking and sealing.............................................................................15

2. OPERATION.....................................................................................................16

2.1. Operating restrictions...........................................................................16

2.2. Safety instructions................................................................................16

2.3. Mounting the flow meter.......................................................................17

2.3.1. Mounting preparation..................................................................17

2.3.2. Mounting requirements...............................................................17

2.3.3. Length requirements for straight pipe runs.................................18

2.3.4. Mounting the flow meter flanged type on the pipeline.................18

2.3.5. Mounting the flowmeter with threaded coupling..........................19

2.3.6. Wiring the flow meter..................................................................19

2.3.7. Dismounting................................................................................20

2.4. Putting into operation...........................................................................20

3. MAINTENANCE................................................................................................21

4. CONTROLLING THE FLOW METER ...............................................................22

4.1. Configuring before work.......................................................................22

4.2. Troubleshooting...................................................................................26

5. PACKING, STORAGE AND TRANSPORTATION............................................27

APPENDIX A. General view .......................................................................28

APPENDIX B. Wiring diagrams ..................................................................31

APPENDIX C. Parameters to be set during on-site configuration...............33

APPENDIX D. Relative length of straight runs............................................36

APPENDIX E. Straightening vane design...................................................38

INTRODUCTION

This document covers battery powered ultrasonic flow meter

"AFLOWT BUF" of BUF-311 version (the flow meter below) and con-

tains the information about its operation and design.

Due to continuous improvement of product policy actual flow me-

ter’s specifications may differ from the data specified in this manual.

However, this will not affect the metrological characteristics and

functionality.

LIST OF ABBREVIATIONS

LCD

PEA

SPS

USS

- Primary converter

- Secondary measuring converter

- Nominal diameter

- Error

- Liquid crystal display

- Personal computer

- Pipeline section

- Electro-acoustic converter (transducer)

- Secondary power source

- Ultrasonic signal

NOTE. Words in the text marked in bold, for example, Low, corre-

spond to the items displayed on the flow meter's screen or PC display

when running "Viewer BUF-311" program.

1. DESCRIPTION AND OPERATION

1.1. Application

1.1.1. "AFLOWT BUF" battery powered ultrasonic flow meter of BUF-311 ver-

sion is designed to measure average volumetric flow rate and volume of

bidirectional flows of cold and hot water.

The flow meters may be used as part of metering systems and au-

tomatic process control systems in power industry and municipal engi-

neering applications.

1.1.2. "AFLOWT BUF" battery powered ultrasonic flow meter, BUF-311 ver-

sion, performs the following functions:

- Measuring average volumetric flow rate in either forward or reverse flow

directions

- Totalizing volume of forward and reverse flows independently or calcu-

lating their algebraic sum with regard to flow direction

- Determining the current value of flow velocity and flow direction

- Outputting measurement results to the frequency/pulse or logical output

- Logging of measurement data and configuration settings in the internal

nonvolatile memory

- Displaying measurement, configuration and history (logged) data on the

built-in indicator (LCD) and outputting the data to the external devices

via M-BUS interface or RS-485 interface

- Configuring the flow meter according to on-site and process require-

ments

- Monitoring and indicating alarm conditions (ER, error situations) and

faults; recording error and fault types and intervals into the correspond-

ing logs

- Protecting logged data and configuration settings from unauthorized ac-

cess.

1.2 Specifications

1.2.1. Specifications are listed in Table 1.

Table 1

Parameter

Value

1. Nominal diameter of the

pipeline, DN

100

125

150

200

250

300

2. Minimal measured average

volumetric flow rate Qmin, m3/h

0.11

0.18

0.28

0.48

0.73

1.13

1.77

2.50

4.53

7.10

10.15

3. Measured transient aver-

age volumetric flow rate Qtrans,

m3/h

0.55

0.9

1.40

2.40

3.60

5.70

8.80

12.7

22.6

35.4

50.9

4. Maximal measured average

volumetric flow rate Qmax, m3/h

14.5

22.6

35.4

59.8

90.6

141.5

221.1

318.4

566.0

885.0

1290

5. Sensitivity threshold, m3/h

0.022

0.036

0.06

0.10

0.15

0.24

0.35

0.54

0.96

1.50

2.16

6. Maximal pressure in the

pipeline, MPa

1.6 (2.5 –request)

7. Temperature of medium, °C

0-90 (130 –request)

8. Power supply voltage, V

3.6 from a lithium battery

9. Mean time to failure, h

75000

10. Mean life time, years

1.2.2. Under normal operating conditions*, the lithium battery keeps the flow

meter operational for at least 10 years without changing the battery.

*Normal operating conditions are as follows:

- Ambient temperature from +15 to +35 °C

- For frequency / pulse / logical outputs, maximal operating frequency of

no more than 8 Hz

- Logs are read (via interface) not more frequently than once a month

- LCD works no more than 3 min per day.

1.2.3. The flow meter measures average volumetric flow rate at flow velocity

ranging from 0.04 to 5.0 m/s. The relation between flow velocity v and

flow rate in the pipeline Q is determined by the following formula:

23- DN10×2.83 Q

Where Q –average volumetric flow rate, m3/h;

v –flow velocity, m/s;

DN –nominal diameter of the pipeline, mm.

1.2.4. Limits of permissible relative error for measurement, indication, logging,

storage and transferring of average volumetric flow rate and volume

measurement results for any flow direction do not fall outside the follow-

ing ranges:

- From Qmin to Qtrans: no more than 4 %

- From Qtrans to Qmax: no more than 2%.

The real values of the errors no more (see fig.1):

- 1.0 % at v > 2.0 to 5.0 m/s

- 2.0 % at v > 0.10 to 2.0 m/s

- 4.0 % at v > 0.04 to 0.10 m/s.

+4%

+2%

-4%

-2% Qmin Qtrans Qmax

-1%

+1%

Fig.1. The figure is a real measurement error of the flow meter

1.2.5. The flow meter provides that the results of measurements can be out-

putted to:

- Universal output in the form of frequency, pulse or logical signal

- M-BUS interface

- RS-485 interface.

1.2.6. The flow meter provides storage of measurement results in the following

logs:

- Hourly log –120 records (hourly records)

- Daily log –45 records (daily records)

- Monthly log –48 records (monthly records)

- Opereting mode log –up to 100 records.

When powered off, the flow meter stores measurement results and

configuration settings for no less than 1 year.

1.2.7. The flow meter is powered from a built-in D-size lithium battery (3.6V

nominal voltage);

1.2.8. The flow meter complies with the following standards:

- Environmental resistance –ambient air temperature range is

+5...+65 °C; relative humidity is no more than 80 % at a temperature

≤35 °C, without moisture condensation

- Atmospheric pressure from 66.0 to 106.7 kPa.

Protection provided by the enclosure is IP65 (IP67 on request).

1.2.9. View, overall dimensions and weight are given in Appendix A.

1.3. Contents of the delivery package

1.3.1. Items of the delivery package are specified in Table 2.

Table 2

Item

Qty

Notes

1. Battery powered ultrasonic flow meter

Note

2. Installation kit

3. Operating documentation:

- Passport

- Operation manual and dedicated software

NOTE. The required items of the delivery package are specified in

the order sheet.

Operating documentation and order sheets for this product and

other products are available on www.aflowt.com.

1.4. Design and operation

1.4.1. Operation principle

1.4.1.1. The flow meter is designed on the base of a pulse-phase method of ul-

trasonic flow measurement. Its operation principle is based on

measuring the time difference between the time it takes for an

ultrasonic signal (USS) to travel through the liquid with the direction of

flow and against it.

Regarding the sounding principle, the flow meter utilizes the meth-

od of one-time simultaneous sounding. Flow meters of this type have

two simultaneously operating signal paths. Each signal path is formed

by a transmitting/receiving path of the flow meter consisting of electron-

ic circuitry [Secondary Converter (CS) and communications cables with

Electroacoustic Converters (PEAs)] and an acoustic path (PEA –fluid –

PEA).

1.4.1.2. PEAs are diametrically (see Fig.2) installed into the measuring section

(Pipeline Section, PS) making up together the Primary Converter (CP).

Fig.2. Diagram showing Pipeline Section (PS) with PEAs installed

1.4.1.3. The CS generates electric sounding pulses which simultaneously come

to PEA1 and PEA2.

USS generated by one PEA is projected through the liquid flowing

in the pipe and is received by the other PEA. Because of liquid flow, a

sound wave is shifted, which in turn leads to the difference in upstream

and downstream times of USS travel: it takes less time for an ultrasonic

signal to travel in the flow direction (from PEA1 to PEA2) than that in

the opposite direction (from PEA2 to PEA1). The difference in upstream

and downstream time of USS travel through an acoustic path dT is

proportional to flow velocity of fluid v and, correspondingly, to volumetric

flow rate Q.

1.4.1.4. The flow rate value is calculated only if the following condition is fulfilled:

Qmin Q,

Where Qmin –minimal value of the flow rate, m3/h;

Q –current value of the flow rate, m3/h.

The recommended value of low flow cutoff corresponds to the flow

meter's sensitivity threshold, m3/h.

If Q < Qmin, condition is fulfilled, the measured flow rate values are

displayed as zero, volume totalizing and pulse transmission to the

universal output are cancelled.

Under Q > Qmax condition (where Qmax corresponds to the flow

velocity value of 5 m/s), the metrological characteristics cannot be

ensured. The flow meter measures and displays flow rate values (de-

pending on temperature, liquid density etc.), however, volume totalizing

and logging, as well as pulse transmission to the Universal Output, are

cancelled.

1.4.2. Design The flow meter's block diagram is shown in Fig.3.

Fig.3. Flow meter's block diagram

BUF-311 flow meter includes the Primary Converter and Secondary

Measuring Converter.

The Primary Converter (CP) is a specially designed measuring pipe

section with one factory-supplied pair of PEAs installed on it.

Secondary Measuring Converter (CS) includes Measurement and

Calculation board, which is responsible for electroacoustic sounding

control, primary and secondary processing of measurement results as

well as for their storing in the memory.

To provide data exchange with external devices, Measurement and

Calculation board is equipped with Universal output, M-BUS output and

RS-485 output (optional).

The graphic Liquid Crystal Display (LCD) makes visible

measurement data. The LCD displays alpha-numeric data in two lines

(16 characters per line). Displayed data is updated with use of the

button located near the LCD on the front panel.

1.4.3. Operating modes

1.4.3.1. The flow meter operates in three modes:

- ADJUSTMENT –adjustment and calibration

- SERVICE –start-up procedures

- OPERATION –user mode.

The operating modes differ by level at which the user can access

certain data (transferred via RS-485 interface) and modify flow meter's

configuration settings.

Maximum rights are granted in ADJUSTMENT mode. The mode

allows the user to modify all of the configuration settings. Minimum

rights are given in OPERATION mode.

The set of displayed parameters is the same in all operating

modes.

Flow meter's work in different operating modes is controlled via RS-

485 interface.

1.4.3.2. Flow meter's operating modes are set by placing (removing) jumpers on

J1 and J2 terminals, which are located on the board of Secondary Cal-

culation module.

Combinations of jumpers with regard to operating modes are

specified in Table 3 ("+" means that the terminal contacts are closed by

a jumper, and "-" means that the terminal contacts are opened).

Table 3

Mode

Terminal

Mode description

OPERATION

Operation

SERVICE

Start-up procedures

ADJUSTMENT

Adjustment

1.4.3.3. OPERATION mode –flow meter's on-site operation.

In OPERATION mode, the user can view the following parameters:

1. On LCD: the current date and time, the values of the measured parame-

ters (volume flow, amounts accumulated in the forward and reverse di-

rection of flow, as well as their algebraic sum), the status of error situa-

tions (ER) and the version number of the software.

2. Via RS-485 or M-Bus:

a) Measurement values of: volumetric flow rate, flow volume totalized for

forward and reverse flow and their algebraic sum, velocity of liquid, cur-

rent value of USS velocity

b) Measurement data and "Mode" logs

c) Configuration settings: current date and time, specifications of output

Ce manuel convient aux modèles suivants

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