Tork AFLOWT BUF-311 User manual

BATTERY POWERED
ULTRASONIC FLOW METER
AFLOWT BUF
VERSION
BUF-311
OPERATION MANUAL

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 ...................................................................... 8
1.4. Design and operation ........................................................................................ 9
1.4.1. Operation principle .................................................................................. 9
1.4.2. Design ................................................................................................... 10
1.4.3. Operating modes ................................................................................... 11
1.4.4. Displaying measurement results ........................................................... 13
1.4.5. External connections ............................................................................. 13
1.4.6. Logging ................................................................................................. 15
1.5. Design ............................................................................................................. 15
1.6. Marking and sealing ........................................................................................ 16
2. OPERATION .................................................................................................................. 17
2.1. Operating restrictions ...................................................................................... 17
2.2. Safety instructions ........................................................................................... 17
2.3. Mounting the flowmeter ................................................................................. 18
2.3.1. Mounting preparation ............................................................................ 18
2.3.2. Mounting requirements ......................................................................... 18
2.3.3. Length requirements for straight pipe runs ........................................... 19
2.3.4. Mounting the flowmeter on the pipeline ................................................ 20
2.3.5. Wiring the flowmeter ............................................................................. 20
2.3.6. Mounting the Secondary Power Source ................................................ 20
2.3.7. Dismounting .......................................................................................... 21
2.4. Putting into operation ...................................................................................... 21
3. MAINTENANCE ............................................................................................................. 22
4. CONTROLLING THE FLOWMETER ............................................................................. 23
4.1. Configuring before work .................................................................................. 23
4.2. Operation procedure ....................................................................................... 27
4.3. Troubleshooting .............................................................................................. 28
5. PACKING, STORAGE AND TRANSPORTATION ........................................................ 29
APPENDIX A. General view ................................................................................... 30
APPENDIX B. Wiring diagrams .............................................................................. 33
APPENDIX C. Parameters to be set during on-site configuration .......................... 35
APPENDIX D. Relative length of straight runs ....................................................... 38
APPENDIX E. Straightening vane design .............................................................. 40
3

INTRODUCTION
This document covers battery powered ultrasonic flowmeter
"AFLOWT BUF" of BUF-311 version (the flowmeter below) and contains
the information about its operation and design.
Due to continuous improvement of product policy actual flowmeter’s
specifications may differ from the data specified in this manual. How-
ever, this will not affect the metrological characteristics and functional-
ity.
LIST OF ABBREVIATIONS
CP
CS
DN
ER
LCD
PC
PS
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 flowmeter's screen or PC display
when running "Viewer BUF-311" program.
4

1. DESCRIPTION AND OPERATION
1.1. Application
1.1.1. "AFLOWT BUF" battery powered ultrasonic flowmeter of BUF-311 ver-
sion is designed to measure average volumetric flow rate and volume of
bidirectional flows of cold and hot water.
The flowmeters 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 flowmeter, 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 current, frequency/pulse and/or
logical outputs
- 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 RS-485 interface
- Configuring the flowmeter 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.
5

1.2 Specifications
1.2.1. Specifications are listed in Table 1.
Table 1
Parameter Value
1. Nominal diameter of the pipeline, DN,
mm 50 80 100 150
2. Minimal measured average volumetric
flow rate Qmin, m3/h 0,28 0,72 1,13 2,5
3. Measured transient average volumetric
flow rate Qtrans, m3/h 1,40 3,62 5,66 12,74
4. Maximal measured average volumetric
flow rate Qmax, m3/h 35 90 150 320
5. Sensitivity threshold, m3/h 0,056 0,144 0,226 0,500
6. Maximal pressure in the pipeline, MPa 1,6
7. Temperature of medium, °C 0-100
8. Power supply voltage, V
- Internal power source
- External power source
3.6 V, when powered from a lithium battery
DC 9...24.5 V
9. Mean time to failure, h 75000
10. Mean life time, years 12
NOTE. Power consumption is no more than 0.9 mW. When charg-
ing the battery after regaining power supply, power consumption is no
more than 1.0 W.
1.2.2. Under normal operating conditions*, the lithium battery keeps the flow-
meter operational for at least 4 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 RS-485) not more frequently than once a month
- LCD works no more than 3 min per day.
1.2.3. The flowmeter 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:
2-3DN
10×2,83
Q
=v , (1)
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 Q trans to Qmax: no more than ±2%.
6

1.2.5. The flowmeter provides that the results of measurements can be output-
ted to:
- Universal output N1 in the form of frequency, pulse or logical signal
-Universal output N2 in the form of logical signal
- RS-485 interface.
1.2.6. The flowmeter 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)
-Mode log – up to 100 records.
When powered off, the flowmeter stores measurement results and
configuration settings for no less than 1 year.
1.2.7. The flowmeter is powered from a built-in D-size lithium battery (3.6V
nominal voltage) or from an external power supply (DC 9...24.5V nomi-
nal voltage; ripple factor of no more ±1 %) via the Charger/Power Sup-
ply unit. If specified in the purchase order, the Secondary Power Source
"VZLJOT IVP" (IVP-06.24) or ADN-1524 may be included in the delivery
package.
Under normal operating conditions, the battery (accumulator) in-
serted into the Charger/Power Supply unit has the capacity to power the
flowmeter for no less than 240 hours when an external power supply is
switched off.
1.2.8. The flowmeter complies with the following standards:
- Environmental resistance – ambient air temperature range is +5...+50
°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 IP68.
1.2.9. View, overall dimensions and weight are given in Appendix A.
7

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 flowmeter BUF-311 1 Note 1
2. Secondary Power Source 1 Note 2
3. USB-RS232/485 adapter 1 Optional
4. Installation kit 1
5. Operating documentation:
- Equipment Certificate 1
- Operation manual and dedicated software 1 CD disk
NOTES:
1. The required design version is specified in the order sheet.
2. "VZLJOT IVP" Secondary Power Source (IVP-06.24) or ADN-1524
models is included in the delivery package on order.
3. The required items of the delivery package are specified in the order
sheet.
8

1.4. Design and operation
1.4.1. Operation principle
1.4.1.1. The flowmeter is designed on the base of a pulse-phase method of ul-
trasonic flow measurement. Its operation principle is based on measur-
ing 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 flowmeter utilizes the method
of one-time simultaneous sounding. Flowmeters of this type have two
simultaneously operating signal paths. Each signal path is formed by a
transmitting/receiving path of the flowmeter consisting of electronic cir-
cuitry [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. 1) installed into the measuring section
(Pipeline Section, PS) making up together the Primary Converter (CP).
Fig. 1. 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 pro-
portional to flow velocity of fluid v and, correspondingly, to volumetric
flow rate Q.
9

1.4.1.4. The flow rate value is calculated only if the following condition is fulfilled:
Qmin ≤Q, (2)
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
flowmeter'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 uni-
versal output are cancelled.
Under Q > Qmax condition (where Qmax corresponds to the flow ve-
locity value of 5 m/s), the metrological characteristics cannot be en-
sured. The flowmeter measures and displays flow rate values (depend-
ing on temperature, liquid density etc.), however, volume totalizing and
logging, as well as pulse transmission to the Universal Output N1, are
cancelled.
1.4.2. Design
The flowmeter's block diagram is shown in Fig. 2.
Fig. 2. Flowmeter's block diagram
10

BUF-311 flowmeter 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 two Universal outputs and RS-485
output.
The graphic Liquid Crystal Display (LCD) makes visible measure-
ment data. The LCD displays alpha-numeric data in two lines (16 char-
acters per line). Displayed data is updated with use of the button lo-
cated near the LCD on the front panel.
1.4.3. Operating modes
1.4.3.1. The flowmeter 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 flowmeter's
configuration settings.
Maximum rights are granted in ADJUSTMENT mode. The mode al-
lows 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 mod-
es.
Flowmeter's work in different operating modes is controlled via RS-
485 interface.
1.4.3.2. Flowmeter'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 speci-
fied in Table 3 ("+" means that the terminal contacts are closed by a
jumper, and "-" means that the terminal contacts are opened).
Table 3
Terminal
Mode J1 J2 Mode description
OPERATION - - Operation
SERVICE - + Start-up procedures
ADJUSTMENT + - Adjustment
11

1.4.3.3. OPERATION mode – flowmeter's on-site operation.
In OPERATION mode, the user can view the following parameters:
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 outputs
d) Operation settings:
- Type of signal processing (median averaging, arithmetical averaging
etc)
- RS-485 settings
- Types of error situations (ER).
1.4.3.4. SERVICE mode – start-up procedures.
In SERVICE mode, in addition to the above, available in OPERA-
TION mode, the operator can do the following:
a) View:
- Configuration of measuring pipe section (device base, axis base, nomi-
nal diameter)
- Settings for ultrasonic signal detection.
b) Modify:
- Settings for flowmeter's control via RS-485 interface (network address,
delay duration, transfer gaps etc.)
- Settings for battery status monitoring
- Settings and operating modes for universal outputs
- Measurement units of volumetric flow rate (m3/h, l/min) and volume
(m3, l)
- Reading of built-in real time clock
- Automatic winter/summer time clock settings
c) Adjust LCD contrast and data update period
d) Initiate calculation of output scale factor or pulse weight for Universal
output N1
e) Clear logs.
1.4.3.5. ADJUSTMENT mode allows to view and modify all of the settings.
In ADJUSTMENT mode, in addition to the above, available in OP-
ERATION and SERVICE mode, the operator can do the following:
- Calibrate the flowmeter
- Enter Device's serial number into the memory.
12

1.4.4. Displaying measurement results
1.4.4.1. List of displayed parameters is given in Table 4.
Table 4
Number of displayed
symbols
Displayed Parameter Units
(format) Integer
part
Fract.
part
Time Current date XX.XX.XX
Data Current date XX:XX:XX
Q
Current value of volumetric
flow rate with regard to flow
direction
(m3/h)
l/min 1-3 4
V+ Totalized volume of forward
flow m3; l 1-7 0-4
V- Totalized volume
of reverse flow m3; l 1-7 0-4
ΣV Total value of
totalized volume m3; l 1-7 0-4
Err Status line – – – – – –
Ver Number of software version XX.XX.XX.XX
NOTES:
1. Flow rate and volume of reverse flow and negative values of total vol-
ume are indicated by negative sign.
2. Totalized volume is the algebraic (considering the sign of the flow) sum
of flow volumes totalized for both forward (positive) and reverse (nega-
tive) flows.
3. Counters are overflowed at V>2×109m3and restart from zero.
1.4.4.2. In SERVICE and ADJUSTMENT mode, the LCD is constantly on. In
OPERATION mode, measurement results listed in Table 4 cyclically
appear on the display on pressing the relevant button. With each press-
ing of the button, the next parameter is indicated. When no button is
pressed during the period specified in the "Service" window of Viewer
BUF-311 program, the LCD goes off.
1.4.5. External connections
1.4.5.1. Serial interface
RS-485 serial interface is used to control the flowmeter, read
measurement results, data logs, configuration settings, and diagnostic
data as well as to modify configuration settings. The RS-485 interface
supports ModBus (RTU ModBus and ASCII ModBus), which is a stan-
dard protocol for VZLJOT instruments.
RS-485 interface supports cable communications among a group of
several end users, one of which can be a PC, at a distance of up to
1200 m. Network Protocol Adapter "VZLJOT AS", ASPV-010 version,
can be used to provide compatibility, if terminal equipment within the
group is produced by different manufacturers.
The flowmeter supports data transfer via RS-485 interface at a
constant speed of 4800 baud. Other communication properties are set
from a PC.
13

1.4.5.2. Universal outputs
The flowmeter is equipped with 2 galvanically connected outputs.
Universal output N1 can operate in the frequency, pulse and logical
modes. Universal output N2 works in the logical mode only.
Diagrams of output stages and description of their operation are
given in Fig. B.2, see Appendix B of the present manual.
Functions, working modes, specifications of output signals and dis-
connection of the outputs are specified programmatically (see section
4.1.3). Options available are specified in Table C.2, see Appendix C of
the present manual.
Operation modes of Universal output N1
•In the frequency mode, measurement results are outputted in the
form of square pulse sequence with period-to-pulse duration ratio of
2 and pulse repetition rate proportional to the current flowrate value.
The frequency output can be scaled by specifying the values for
"Maximum output frequency" and "Output conversion factor" pa-
rameters as well as for "Lower limit by flowrate" and "Up. limit by
flowrate" threshold flowrate values that correspond to zero and
maximum frequencies of the output signal. Maximum output fre-
quency value is 2000 Hz for ADJUSTMENT mode and 100 Hz for
OPERATION and SERVICE modes.
CAUTION! Please note that the higher the value of maximum fre-
quency, the faster the battery is discharged. The recommended Fmax
value is 8 Hz.
•In the pulse mode, a burst of pulses is generated on the output
within a second, in which the number of pulses (considering Pulse
weight) corresponds to the flow volume measured over a previous
second. Maximum pulse repetition rate permissible in a burst (me-
ander-like, period-to-pulse duration ratio of 2) is 1000 Hz in AD-
JUSTMENT mode and 100 Hz in SERVICE mode.
CAUTION! Please note that increasing the number of pulses in a
burst results in a faster discharge of the battery. It is recommended to
set the value of pulse weight so that the number of pulses in a burst
does not exceed 8.
To provide correct work of Universal output N1, the parameters
"Conversion factor calc." (pulses/m3) in the frequency mode and
“Pulse weight calcul.” (m3/pulse) in the pulse mode are calculated au-
tomatically.
The conversion factor is calculated on the basis of user-specified
values set for the "Lower limit by flowrate" and "Up. limit by flowrate"
parameters and "Maximum output frequency" parameter. The pulse
weight is calculated from the values set for the "Up. limit by flowrate"
and "Pulse width" parameters. The pulse width can be set in the range
1 to 500 ms.
•In the logic mode, one signal level corresponds to “event” (or its
state) and the other level corresponds to “no event” (or another
state).
14

Programmatically this means: "Active level", i.e. "Low" or "High"
signal level is set when the event is present. Electrical parameters of
corresponding signal levels are specified in Appendix B.
Universal output N2 has identical parameters and works in the
same way as Universal output N1 in the logical mode.
The flowmeter is delivered preset so that the universal outputs are
disabled.
CAUTION! When the flowmeter works together with "VZLJOT
TSR-M" heat meters, it is recommended to set Universal output N1 to
the pulse mode.
1.4.6. Logging
1.4.6.1. Measurement results are recorded into the flowmeter's internal logs:
hourly, daily and monthly logs. Logs are accessed via RS-485 interface.
Hourly, daily, and monthly logs are arranged as circular buffers and
have the same structure.
Log capacity:
- Hourly log– 120 records (hourly records)
- Daily log– 45 records (daily records)
- Monthly log– 48 records (monthly records).
Format of one record is as follows:
- V+ – total volume for direct flow over logging interval, m3(l)
- V- – total volume for reverse flow over logging interval, m3(l)
- Errors – code of error situation
- Time of errors – duration of error situation
- Operating time – time of totalizer operation.
1.4.6.2. Modifications made on the operation mode are logged in the Mode log
with a capacity of 100 records.
Mode log format is as follows:
- Order number of the record
-Name of the active operation mode
- Date and time of activation.
1.5. Design
1.5.1. The Measuring pipe section (PS) with the Secondary converter (CS) in-
stalled on it are delivered as an assembly unit (see Fig. A1, Appendix
A).
The PS is made of metal. It comes with flanges installed on its ends
to connect the PS to the pipeline via rubberized asbestos fabric gas-
kets.
1.5.2. Electro-acoustic converters
1.5.2.1. PEAs alternately operate in two modes: transmitter mode, in which the
electrical pulse signal coming from the CS is transduced into ultrasonic
waves, and receiver mode, in which ultrasonic waves in liquid are
transduced into the corresponding electrical signal.
1.5.2.2. The flowmeter works with built-in PEAs.
15

The built-in PEAs come in cylindrical case with the transmitting
plane in the form of a disk in the flat end. The built-in PEAs are
mounted onto the Measuring pipe section so that the transmitting (radi-
ating) plane contacts the medium. Pipeline-PEA contact surface is
sealed.
The PEAs and CS are connected by twisted pair cables.
1.5.3. The CS is directly installed on the measuring PS and includes Meas-
urement and Calculation board. The board is placed in the transparent
cover of the case (on the front panel). The power supply cable (pro-
vided the Charger/Power Supply unit is installed) and signal cables are
entered into the case through three cable glands of SKINTOP type.
View of IVP-06.24 secondary power source is shown in Fig. A 3,
view of ADN-1524 power source is represented in Fig. A.4.
1.6. Marking and sealing
1.6.1. The front panel of the CS bears flowmeter's name and designation,
manufacturer's logo, and sign of the Type Approval Certificate. Serial
number is indicated on the nameplate located on the CS case.
1.6.2. The cap covering J1 terminal, used to enable modification of calibration
settings, is sealed after performing calibration (see Fig. A.2, Appendix
A).
1.6.3. J2 terminal used to enable modification of flowmeter's operation set-
tings is sealed on completing start-up procedures and putting the De-
vice into operation.
1.6.4. To protect the device from unauthorized access during transportation,
seals may be hung through the lugs located on the front and rear pan-
els.
16

2. OPERATION
2.1. Operating restrictions
2.1.1. Environmental restrictions with regard to the factors affecting the per-
formance and characteristics of the controlled medium shall comply with
the requirements specified in the operating documentation.
2.1.2. For precision and reliable operation, when choosing CP mounting loca-
tion, the following conditions must be met:
- Liquid pressure in the pipeline and pipeline's operational characteristics
must not be of values that may facilitate gas release and/or gas (air)
collection
- When the flowmeter is operated, the PS should be fully filled with liquid.
2.1.3. Type and composition of medium (suspensions and their concentration,
impurity substances, etc.), operating mode and pipeline conditions must
not lead to corrosion and/or sediments affecting the performance and
metrological characteristics of the flowmeter.
2.1.4. Lightning protection system for the site where the flowmeter is located
(complying with "Guidelines on lightning protection of buildings, con-
structions and industrial pipelines" SO153-34.21.122-2003) protects the
device against failures caused by lightning strokes.
2.1.5. Mounting location and operating conditions requirements specified in
this operating documentation are based on the most typical factors af-
fecting flowmeter performance.
The external factors that cannot be foreseen, evaluated or tested
by the manufacturer during designing may exist or appear on site.
In this case, it is necessary to eliminate these factors or place the
flowmeter in other location.
2.2. Safety instructions
2.2.1. The flowmeter should only be used by the technical staff familiar with all
operating documentation for the product.
2.2.2. When putting the product into operation and during operation, "Rules for
Operating Electrical Systems By Consumers" and “Interbranch Rules
for Labor Safety (Safety Rules) When Operating Electrical Systems"
must be observed.
2.2.3. When working with the flowmeter, the dangerous factors are as follows:
-AC voltage (RMS value up to 264 V, frequency 50 Hz)
-Pipeline pressure (up to 1.6 MPa)
- Other site-specific factors.
2.2.4. On detecting external defects on the device or damages to mains ca-
bling, you must remove power from the device and contact the author-
ized technician for the information about the device's operability.
2.2.5. In the course of mounting, start-up or repair works you must not:
- Make connections to the flowmeter, switch over modes and replace
electronic components, if the flowmeter is powered up
17

- Remove the flowmeter's components from the pipeline until pressure in
the pipeline section worked on is fully released
- Use defective electronic devices and electric tools or use them without
proper grounding (neutral earthing).
2.3. Mounting the flowmeter
2.3.1. Mounting preparation
2.3.1.1. When mounting the flowmeter on site, a free pipeline section should be
provided.
2.3.1.2. The flowmeter should be transported packed in the manufacturer’s box.
After the flowmeter has been moved to the mounting location from
a cold environment into a warm one (with ambient temperature above
zero), it shall be left to stand in the manufacturer’s box for at least 3
hours to make sure that no condensation remains inside.
When unpacking the flowmeter, check that the delivery package
contains all items specified in the Equipment Certificate.
2.3.2. Mounting requirements
2.3.2.1. The requirements for on-site mounting of the flowmeter are specified in
section 2.1.2.
The CP can be mounted into the pipeline horizontally, vertically, or
obliquely (Fig.3). The CP should not be placed at the upper point of the
pipeline. The recommended location (if applicable) is at the lower or up-
rising pipeline section.
Fig. 3. Recommended locations of the CP
2.3.2.2. The difference in the internal diameters of the pipeline and measuring
Pipe Section (PS) of the CP at link up points should not exceed 0.05
·DN.
2.3.2.3. When mounting the CP on the pipeline, it should be placed so that the
PEA longitudinal axis (the axis that runs through the PEA pair along the
pipeline axis) would make an angle with the vertical of β= 45°-90°
(Fig.4).
18

Fig. 4. Recommended locations of PEA pair
2.3.3. Length requirements for straight pipe runs
2.3.3.1. For proper operation of the flowmeter, before the first and the last PEA
with respect to the flow direction, there should be straight pipe runs of
corresponding length with the DN equal to the DN of the CP. Table D.1
given in Appendix D shows minimum values of relative length of pipe-
line straight runs that should be used for typical installations.
The length of the straight pipe run L (mm) is calculated as follows:
DNN=L ×, (3)
where N is the relative length defined in the number of DNs and specified
in Table D.1;
DN – CP nominal diameter, mm.
CAUTION! While measuring the reverse flow, all the PEAs are in
upstream position, and the length of the straight pipe runs shall be de-
fined in view of this condition.
If the required lengths of the straight pipe runs cannot be provided
at the estimated PEA location as per Appendix D, the on-site survey is
needed to specify the opportunities for individual measuring procedure
based on the measurement conditions at the particular site.
2.3.3.2. The lengths of straight pipe runs for the hydraulic resistance of “thermal
transducer in a protection sleeve” type can be defined in accordance
with the two bottom lines of the table in Appendix A (for plugged tap-
pings) provided that the following condition is observed:
Dt/ Di>0.1, (4)
Where Dtis the diameter of the protection sleeve of the thermal trans-
ducer, mm;
Diis the pipeline inside diameter, mm.
If the condition Dt/ Di <0.1 is fulfilled, the thermal transducer’s hy-
draulic resistance may be neglected.
2.3.3.3. Any diaphragm or venturi type structure, as well as any valve, refer to
the type of hydraulic resistance specified in Appendix D as “control
valve”.
2.3.3.4. In case of mounting the straightening vane into the pipeline before the
measuring Pipe Section (Appendix E), reduction of straight pipe run
length is possible at the inlet of the CP up to two times. In this case, the
required length of the straight pipe run is defined on the base of site
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survey, and the individual measurement technique shall be designed for
this structure.
2.3.4. Mounting the flowmeter on the pipeline
2.3.4.1. Before working on the pipeline at the CP mounting location, fix the pipe
sections that may tip out of their axes after cutting the pipeline.
CAUTION! Before mounting the flowmeter, it is necessary to
cut off liquid flow in the pipeline section where the flowmeter will
be installed, make sure that pressure is released and drain the liq-
uid.
2.3.4.2. Cut a pipe run of the required length at the selected liquid-free pipeline
section. Join the flowmeter's flanges with the companion flanges pro-
vided in the delivery package and bolt them together. Make several tack
welds between the cut ends of the pipeline and companion flanges.
Then, remove the flowmeter and finally weld the flanges to the pipeline.
The flanges shall be welded as specified in National Standard
GOST16037-80 "Welded Joints of Steel Pipelines". Alignment of the
whole unit and flatness/parallel alignment of the flanges for the CP to be
mounted between them must be provided.
2.3.4.3. Mount the flowmeter on the pipeline provided that the arrow on the CP
points to the flow direction. Put rubberized asbestos fabric gaskets be-
tween the mating flanges and bolt the flanges.
CAUTION! IT IS STRICTLY FORBIDDEN to throw the flowmeter
and hit it while mounting. This can cause damage to the PEAs installed
on it. DO NOT take the flowmeter by the CS case or PEA connection
cables. During welding, PROVIDE the CS cable and PEA cables with
adequate protection from sparks. The welding temperature at the PEA
section SHALL BE lower than 100 °C.
2.3.5. Wiring the flowmeter
2.3.5.1. The flowmeter’s power cable and CS-external devices connection ca-
bles (if applicable) are laid in accordance with the flowmeter’s operating
conditions.
2.3.5.2. Communications and network cables are fixed on the wall wherever
possible. The network cable is laid separately at a distance of 30 cm as
a minimum from other cables. To avoid mechanical damages, it is rec-
ommended to place all cables in metal tubes or sleeves.
With presence of high-level electromagnetic interference (for in-
stance, from a thyristor controller) IT IS FORBIDDEN to lay the cables
without putting them into properly grounded (neutrally earthed) metal
tubes or sleeves.
2.3.5.3. It is recommended not to coil the excessive cables.
2.3.5.4. Prior to connection, cut insulation from cable ends. The cables are di-
rected via cable-through holes and attached to the connectors accord-
ing to the Wiring diagram given in Fig. B.1, see Appendix B. Refer to
Fig. A.2 of Appendix A for orientation of the connectors on the Meas-
urement and Calculation Board.
2.3.6. Mounting the Secondary Power Source
2.3.6.1. The rear panel of SPS case (if applicable) is equipped with the brackets,
which are used to mount SPS on DIN rail.
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