AFLOWT BUF M Manuale utente

BATTERY POWERED

ULTRASONIC FLOW METER

AFLOWT BUF M

VERSION

BUF-310

OPERATION MANUAL

ISO 9001:2015

* * *

Manufacturer quality management system is certified to

ISO 9001:2015

* * *

URL: http://www.aflowt.com


 
TABLE OF CONTENTS Page 
INTRODUCTION.....................................................................................................4 
DESCRIPTION AND OPERATION.....................................................................5 
1. Application.............................................................................................5 
2 Specifications..........................................................................................6 
3. Metrological characteristics....................................................................7 
4. Contents of the delivery package...........................................................8 
5. Design and operation.............................................................................9 
5.1. Operation principle.................................................................................9 
5.2. Design .................................................................................................10 
5.3. Access levels.......................................................................................11 
5.4. Recording of operation results.............................................................12 
5.5. Information output................................................................................13 
6. Flow meter design................................................................................16 
7. Marking and sealing.............................................................................16
INTENDED USE................................................................................................17
1. Operational restrictions........................................................................17
2. Safety measures..................................................................................18 
INSTALLATION OF THE FLOW METER..........................................................19
1. Transportation......................................................................................19
2. Installation requirements for the flow meter.........................................19 
3. Requirements for the length of straight sections..................................20
4. Installation on the pipeline ...................................................................20
5. Electrical installation of the flow meter.................................................21
6. Dismantling the flow meter...................................................................22
OPERATION.....................................................................................................23
1. Setting up before operation..................................................................23
2. Pre-commissioning ..............................................................................28
3. Operating procedure............................................................................29
READING DATA WITH A SMARTPHONE........................................................30
1. Hardware requirements .......................................................................30 
2. Installing the AFLOWT BUF monitor application..................................30 
3. Connecting to the flow meter ...............................................................32 
4. Reading parameters ............................................................................33
5. ABOUT UNIT tab.................................................................................34
6. MEASUREMENTS tab.........................................................................35 
7. ARCHIVES tab ....................................................................................36 
MAINTENANCE................................................................................................42
1. Technical condition monitoring ............................................................42
2. Troubleshooting...................................................................................43 
PACKING, STORAGE AND TRANSPORTATION............................................44
APPENDIX A. Appearance of the flow meter..............................................45
APPENDIX B. Wiring diagrams ..................................................................48
APPENDIX C. Parameters available for editing in Monitor BUF (310) 
application............................................................................................50 
APPENDIX D. Relative length of straight runs............................................53
APPENDIX E. Flow straightener design .....................................................55

INTRODUCTION

This document covers battery powered ultrasonic flow meter

"AFLOWT BUF M" of BUF-310 version and contains the information

about its design, operation and installation.

Due to continuous improvement of product policy actual flow meter’s

specifications may differ from the data specified in this manual. However,

this will not affect the metrological characteristics and functionality.

LIST OF ABBREVIATIONS

SMC

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 Monitor BUF (310) program.

* * *

Validation documents are available on website www.awlowt.com.

1. DESCRIPTION AND OPERATION

1.1. Application

1.1.1. AFLOWT BUF M battery powered ultrasonic flow meter of BUF-310 ver-

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

bidirectional flows of cold water.

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

plexes, in heat metering systems, automatic process control systems in

power industry and municipal, etc.

1.1.2. AFLOWT BUF M battery powered ultrasonic flow meter of BUF-310 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 regarding flow direction

- Determining the current value of flow velocity and flow direction

- Output of measurement results to the frequency/pulse or logic output

- Output of measurement data on the indicator, as well as through the M-

Bus interface or Wireless M-Bus interface

- Output of measuring, diagnostic, installation, archive and other infor-

mation via RS-485 serial interface or NFC radio transponder according

to ISO 15693

- Archiving of measurement results and setting parameters in energy-inde-

pendent memory

- Possibility of entering setting parameters by means of software, consid-

ering individual features and characteristics of the measurement object

- Automatic control and indication of emergencies and failures, as well as

recording of their type and duration in the archives

- Protection of the archival and adjusting data from unapproved access.

1.2 Specifications

1.2.1. Specifications of the flow meter AFLOWT BUF M of BUF-310 version are

listed in Table 1.

Table 1

Parameter

Value

Notes

1. Nominal diameter of the pipeline, DN

2. Minimal measured average volumetric flow rate

Qmin, m3/h

0.25

3. Maximal measured average volumetric flow rate

Qmax, m3/h

90.0

4. Sensitivity threshold, m3/h

0.057

5. Maximal pressure in the pipeline, MPa

1.6

6. Properties of working fluid:

- temperature, °C

- density, kg/m3

- gas occlusion content, % of volume

0 to 50

700 to 1200

no more than 5

7. Power supply voltage, V

3.6

see clause

1.2.6

8. Mean time to failure, h

75000

9. Mean life time, years

1.2.2. The flow meter provides indication of the measured parameter values with

the digit specified in clause 1.5.5.1 of this manual.

1.2.3. The flow meter provides that the results of measurements can be output-

ted to:

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

- logic output

- RS-485 and M-BUS interface

- Wireless M-Bus interface

- NFC interface.

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

logs:

- Hourly log –1440 records (hourly records) –60 days

- Daily log –460 records (daily records)

- Monthly log –48 records (monthly records)

- Mode log –up to 1000 record

- Operating mode log –up to 4000 records.

When powered off, the flow meter stores measurement results and

configuration settings for no less than 1 year.

1.2.5. Environmental resistance:

- To climatic influences –the ambient temperature range is from 5 to 50 °C,

relative humidity is not more than 80% at temperatures up to 35 °C, with-

out moisture condensation

- To mechanical stress –vibration in the frequency range from 10 to 55 Hz

with an amplitude of not more than 0.35 mm

- Atmospheric pressure ranges from 84.0 to 106.7 kPa.

The degree of protection of the flow meter corresponds to the IP67

or IP68. The required degree of protection of the device is determined

when ordering.

1.2.6. The power supply of the flow meter is provided from an internal lithium C

size battery with a nominal voltage of 3.6 V.

1.2.7. Appearance, overall dimensions and weight are given in Appendix A.

1.3. Metrological characteristics

1.3.1. The limits of permissible error in measuring the average volumetric flow

rate, the volume of liquid in any direction of flow do not exceed the values

given in table 2.

Table 2

Error formula

Relative error limit value











 v

0.1

0.95δ

1.0 % at v > 2.00 m/s

1.5 % at v > 0.19 m/s

2.0 % at v > 0.10 m/s

3.0 % at v > 0.05 m/s

4.0 % at v > 0.033 m/s

where v –flow velocity, m/s.

1.3.2. The diagram of real measurement error of the flow meter is shown in

Fig.1.

+4%

+2%

-4%

-2% v,m/s

0.033 5

+1%

-1% 0.01 2

Fig.1. Diagram of real measurement error of the flow meter

1.4. Contents of the delivery package

Items of the delivery package are specified in Table 3.

Table 3

Item

Qty

Notes

1. Flow meter

Note 1

2. Installation kit

Note 2

3. Passport

4. Operation manual

Note 3

NOTES:

1. The size and the protection rating of the flow meter, the types of interfaces

are set on request.

2. The required items of the delivery package are specified in the order

sheet.

3. Operating documentation and order sheets for this product and other

products are available on: www.aflowt.com.

4. To connect the device with external devices via RS-485 interface, it is

possible to supply a USB signal adapter –RS-232 / RS-485 on request.

1.5. Design and operation

1.5.1. Operation principle

1.5.1.1. 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.

1.5.1.2. The peculiarity of this type of ultrasonic flow meter is alternating supply of

electrical probing pulses generated by the secondary converter (SMC) to

the converters PEA1 and PEA2 (Fig.2).

Fig.2. Diagram of the pipeline section with PEA installed

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 oppo-

site direction (from PEA2 to PEA1). The difference in upstream and

downstream time of USS travel through an acoustic path dT is propor-

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

rate Q.

1.5.1.3. The flow rate value Q is calculated only if the following condition isfulfilled:

Q ≥ Qmin,

where Qmin–minimal value of the flow rate at which the measured flow

rate value in the flow meter is set to zero, the volume accumulation and

pulse output at the universal output stops.

The recommended value of low flow cutoff corresponds to the flow

meter's sensitivity threshold.

If Q > Qmax condition (where Qmax responds to the flow velocity value

of 5 m/s) condition is fulfilled, flow measurement continues, but volume

accumulation, archiving and pulse output at the universal output stops.

1.5.2. Design

The block diagram of flow meter AFLOWT BUF M of BUF-310 ver-

sion is shown in Fig.3.

Fig.3. Block diagram of flow meter

The BUF-310 flow meter consists of a primary converter (CP) and a

secondary converter.

The primary flow converter is a pipeline section (pipe section with

pipe connections for PEA installation and flanges for pipe connection)

with two PEAs installed on it (Fig.A.1 of Appendix A).

The PEA operates in two modes: radiation, when the electrical pulse

signal from the secondary converter is converted into ultrasonic vibra-

tions, and reception, when the ultrasonic vibrations of the liquid are con-

verted into an appropriate electrical signal.

The secondary converter contains a processing module that acts as

a meter and calculator as well as a display module. The processing mod-

ule controls the electro-acoustic sounding, processes the measurement

signals from the PEA and performs the secondary processing of the

measurement information and ensures the storage of the measurement

results.

External communications of the flow meter are provided by means

of universal and logic outputs available on the processing module as well

as optional RS-485 serial interface modules, M-Bus interface or Wireless

M-Bus interface installed in the processing module.

The measuring information is displayed on a graphical liquid crystal

display (LCD) located on the display module. LCD provides output of two

lines of alphanumeric information at 16 characters per line. The infor-

mation output is controlled by means of an optical button located on the

front panel next to the LCD.

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