KROHNE ALTOSONIC V12 User manual

Ultrasonic gas flowmeter for custody transfer
ALTOSONIC V12
ALTOSONIC V12ALTOSONIC V12
ALTOSONIC V12 Handbook
HandbookHandbook
Handbook
© KROHNE 01/2019 - 4002643505 - MA ALTOSONIC V12 R05 en

All rights reserved. It is prohibited to reproduce this documentation, or any part thereof, without
the prior written authorisation of KROHNE Messtechnik GmbH.
Subject to change without notice.
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Copyright 2019 by
KROHNE Messtechnik GmbH - Ludwig-Krohne-Str. 5 - 47058 Duisburg (Germany)
: IMPRINT :::::::::::::::::::::::::::::::::::::::

CONTENTS
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1 Safety instructions 7
1.1 Intended use ..................................................................................................................... 7
1.2 Certifications .................................................................................................................... 7
1.3 Safety instructions from the manufacturer ..................................................................... 8
1.3.1 Copyright and data protection ................................................................................................ 8
1.3.2 Disclaimer ............................................................................................................................... 9
1.3.3 Product liability and warranty ................................................................................................ 9
1.3.4 Information concerning the documentation........................................................................... 9
1.3.5 Warnings and symbols used................................................................................................. 10
1.4 Safety instructions for the operator............................................................................... 10
2 Device description 11
2.1 Scope of delivery............................................................................................................. 11
2.2 Hardware description..................................................................................................... 11
2.2.1 Transducers .......................................................................................................................... 12
2.2.2 The electronic unit ................................................................................................................ 13
2.3 Software description ...................................................................................................... 15
2.4 Nameplates .................................................................................................................... 16
3 Installation 18
3.1 Notes on installation ......................................................................................................18
3.2 Storage ........................................................................................................................... 18
3.3 Transport ........................................................................................................................ 19
3.4 Pre-installation requirements ....................................................................................... 20
3.5 Installation...................................................................................................................... 20
3.5.1 Mounting position.................................................................................................................. 20
3.5.2 Pipe diameters and lengths.................................................................................................. 21
3.5.3 Flow conditioners.................................................................................................................. 21
3.5.4 Inlet and outlet for uni-directional use ................................................................................ 22
3.5.5 Control valves........................................................................................................................ 23
3.5.6 P and T sensors..................................................................................................................... 23
3.6 Temperatures................................................................................................................. 24
4 Electrical connections 25
4.1 Safety instructions.......................................................................................................... 25
4.2 Opening and closing covers ........................................................................................... 25
4.3 Digital I/O connections ................................................................................................... 26
4.3.1 Pulse and frequency output.................................................................................................. 27
4.3.2 Status outputs ....................................................................................................................... 27
4.3.3 Emulation of a turbine meter ............................................................................................... 28
4.4 Analog I/O connections................................................................................................... 29
4.5 Serial data communication (RS 485).............................................................................. 30
4.6 KROHNE Care board ...................................................................................................... 31
4.7 Power connection ...........................................................................................................32
4.8 Cabling............................................................................................................................ 33
4.9 Grounding ....................................................................................................................... 34

CONTENTS
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5 Start-up 35
5.1 Starting the signal converter ......................................................................................... 35
6 Operation 36
6.1 Display and operating elements .................................................................................... 36
6.1.1 Display in measuring mode with 1 or 3 measured values ................................................... 37
6.2 Menu overview................................................................................................................ 38
6.3 Access control and seals................................................................................................ 39
7 Software service tool 41
7.1 Introduction .................................................................................................................... 41
7.2 Installation of the software ............................................................................................ 41
7.3 Starting a session........................................................................................................... 41
7.4 Loading a monitoring configuration............................................................................... 46
7.5 Changing and saving a monitoring configuration.......................................................... 49
7.5.1 Creating a monitoring configuration .................................................................................... 49
7.5.2 Saving a monitoring configuration with a new name ........................................................... 52
7.5.3 Saving a monitoring configuration with its current name ................................................... 54
7.6 Creating a monitoring configuration.............................................................................. 55
7.7 Viewing data.................................................................................................................... 58
7.7.1 Unformatted data.................................................................................................................. 58
7.8 Customizing the way data is presented ......................................................................... 59
7.8.1 Setting up tabs in the user view window .............................................................................. 59
7.8.2 Creating a new grid definition............................................................................................... 61
7.8.3 Creating a new graphical presentation ................................................................................ 65
7.9 Creating reports ............................................................................................................. 66
7.9.1 Reporting related to parameter settings ............................................................................. 67
7.9.2 Reporting related to process values .................................................................................... 71
7.9.3 Reporting related to calibration parameters ....................................................................... 71
7.9.4 Reporting related to privileges............................................................................................. 71
7.10 Remote logging............................................................................................................. 71
7.11 Customizing the data logging process......................................................................... 72
7.12 Adjusting parameter settings....................................................................................... 77
7.13 Save flowmeter configuration file ................................................................................ 77
8 Service 79
8.1 Periodic maintenance..................................................................................................... 79
8.2 Cleaning.......................................................................................................................... 79
8.3 Exchange of transducers................................................................................................ 80
8.4 Exchange of transducers - Depressurised condition .................................................... 80
8.5 Exchange of transducers - Pressurised condition ........................................................ 87
8.5.1 Transducer retraction tool.................................................................................................... 89
8.5.2 Procedure to remove a transducer ...................................................................................... 90
8.6 Exchange of electronics unit ........................................................................................ 102
8.6.1 Field version........................................................................................................................ 102
8.7 Battery maintenance .................................................................................................... 105

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8.8 Availability of services .................................................................................................. 105
8.9 Returning the device to the manufacturer................................................................... 105
8.9.1 General information............................................................................................................ 105
8.9.2 Form (for copying) to accompany a returned device.......................................................... 106
8.10 Disposal ...................................................................................................................... 106
9 Technical data 107
9.1 Measuring principle...................................................................................................... 107
9.2 Transit time measuring principle ................................................................................ 107
9.3 Swirl compensation...................................................................................................... 108
9.4 Multipath ultrasonic flowmeters.................................................................................. 109
9.5 Technical data table ..................................................................................................... 110
9.6 Dimensions and weights .............................................................................................. 115
9.7 Flow tables ................................................................................................................... 120
10 Modbus protocol description and set-up 122
10.1 Introduction ................................................................................................................ 122
10.2 Physical Communication Layer.................................................................................. 122
10.3 Serial transmission format ........................................................................................ 123
10.3.1 ASCII mode........................................................................................................................ 123
10.3.2 RTU mode.......................................................................................................................... 124
10.4 Modbus message framing.......................................................................................... 124
10.4.1 Address Field (Device Address)........................................................................................ 125
10.4.2 Function Field ................................................................................................................... 125
10.4.3 Data Field .......................................................................................................................... 125
10.4.4 Error checking methods ................................................................................................... 125
10.4.5 Transmission gaps............................................................................................................ 126
10.4.6 Time out............................................................................................................................. 126
10.5 Supported functions ................................................................................................... 127
10.5.1 Function 01: READ COILS ................................................................................................. 128
10.5.2 Function 02: READ DISCRETE INPUTS............................................................................. 128
10.5.3 Function 03: READ HOLDING REGISTERS........................................................................ 128
10.5.4 Function 04: READ INPUT REGISTERS............................................................................. 129
10.5.5 Function 05: WRITE SINGLE COIL .................................................................................... 129
10.5.6 Function 06: WRITE SINGLE HOLDING REGISTER........................................................... 129
10.5.7 Function 08: DIAGNOSTICS............................................................................................... 130
10.5.8 Function 15: WRITE MULTIPLE COILS ............................................................................. 130
10.5.9 Function 16: WRITE MULTIPLE HOLDING REGISTERS.................................................... 130
10.5.10 Exception responses ....................................................................................................... 131
10.6 Handling of large data types ...................................................................................... 132
10.6.1 Integer (16 bit), Transmit sequence.................................................................................. 133
10.6.2 Long integer (32 bit), Transmit Sequence ........................................................................ 134
10.6.3 Single precision floating point (32 bit), transmit sequence ............................................. 134
10.6.4 Double precision floating point (64 bit), transmit sequence ............................................ 135
10.6.5 Long long (64 bit integer), transmit sequence ................................................................. 136
10.6.6 Maximum number requested items ................................................................................. 136
10.7 Default settings ..........................................................................................................137
10.8 Modbus register mapping .......................................................................................... 138
10.8.1 Input Registers (read-only): Integer (16-bit); address range 3000-3499 ........................ 138
10.8.2 Holding Registers (read/write): Integer (16-bit); address range 3500-3999................... 139

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10.8.3 Input Registers (read-only): Long integer (32-bit); address range 5000-5499 ............... 139
10.8.4 Holding Registers (read/write): Long integer (32-bit), addres range 5500-5999............ 144
10.8.5 Input Registers (read-only): Double (64-bit floating point), address range 6000-6499 .. 144
10.8.6 Holding Registers (read/write): Double (64-bit floating-point), address range 6500-6999 ..
144
10.8.7 Input Registers (read-only): Float (32-bit floating-point), address range 7000-7499..... 145
10.8.8 Holding Registers (read/write): Float (32-bit) floating-point, address range 7500-7999 149
10.8.9 Input Registers (read-only): Long long (64-bit integer), address range 8000-8499........ 152
10.8.10 Holding Registers (read/write): Long long (64-bit integer), address range 8500-8999 153
11 Notes 154

SAFETY INSTRUCTIONS 1
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1.1 Intended use
The ALTOSONIC V12 is an ultrasonic gas flowmeter for high accurate and custody transfer
applications.
1.2 Certifications
European Union (EU):
European Union (EU):European Union (EU):
European Union (EU):
•Pressure Equipment Directive 2014/68/EC
•EMC directive 2014/30/EU, according to:
EN 61326-1
EN 61326-2
EN 61326-3
•ATEX directive 2014/34/EU according to:
EN 60079-0
EN 60079-1 (Ex 'd')
EN 60079-7 (Ex 'e')
EN 60079-18 (Ex 'ma')
•Custody transfer approvals according to:
MID directive 2014/32/EU ((MID = Measurement Instrument Directive)
OIML R137-1 (International Organization for Legal Metrology)
OIML D11
•Fully compliant to AGA 9
•Fully compliant to ISO 17089
USA:
USA:USA:
USA:
•Certified for use in potentially explosive atmospheres according to FM:
FM3615
ANSI/UL 50E
UL 61010-1
CAUTION!
Responsibility for the use of the measuring devices with regard to suitability, intended use and
corrosion resistance of the used materials against the measured fluid lies solely with the
operator.
INFORMATION!
The manufacturer is not liable for any damage resulting from improper use or use for other than
the intended purpose.
CAUTION!
High levels of CO
2
can inhibit the operation of an ultrasonic flowmeter due to its acoustic
absorption properties. It is recommended to submit a specification of the process medium to be
measured at the manufacturer for advice.
LEGAL NOTICE!
The ALTOSONIC V12 custody transfer gas flowmeter meets the technical requirements and
standards applicable to equipment designed for use in different countries world wide.

1 SAFETY INSTRUCTIONS
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Canada:
Canada:Canada:
Canada:
•CAN
•CSA C22.2 No. 30
•CSA C22.2 No. 25
•CSA C22.2 No. 94.2
•CSA C22.2 No. 61010-1
1.3 Safety instructions from the manufacturer
1.3.1 Copyright and data protection
The contents of this document have been created with great care. Nevertheless, we provide no
guarantee that the contents are correct, complete or up-to-date.
The contents and works in this document are subject to copyright. Contributions from third
parties are identified as such. Reproduction, processing, dissemination and any type of use
beyond what is permitted under copyright requires written authorisation from the respective
author and/or the manufacturer.
The manufacturer tries always to observe the copyrights of others, and to draw on works created
in-house or works in the public domain.
The collection of personal data (such as names, street addresses or e-mail addresses) in the
manufacturer's documents is always on a voluntary basis whenever possible. Whenever
feasible, it is always possible to make use of the offerings and services without providing any
personal data.
We draw your attention to the fact that data transmission over the Internet (e.g. when
communicating by e-mail) may involve gaps in security. It is not possible to protect such data
completely against access by third parties.
We hereby expressly prohibit the use of the contact data published as part of our duty to publish
an imprint for the purpose of sending us any advertising or informational materials that we have
not expressly requested.
INFORMATION!
Not all country specific approvals are listed here. Please consult KROHNE in case of a specific
approval that is not listed here.

SAFETY INSTRUCTIONS 1
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1.3.2 Disclaimer
The manufacturer will not be liable for any damage of any kind by using its product, including,
but not limited to direct, indirect or incidental and consequential damages.
This disclaimer does not apply in case the manufacturer has acted on purpose or with gross
negligence. In the event any applicable law does not allow such limitations on implied warranties
or the exclusion of limitation of certain damages, you may, if such law applies to you, not be
subject to some or all of the above disclaimer, exclusions or limitations.
Any product purchased from the manufacturer is warranted in accordance with the relevant
product documentation and our Terms and Conditions of Sale.
The manufacturer reserves the right to alter the content of its documents, including this
disclaimer in any way, at any time, for any reason, without prior notification, and will not be liable
in any way for possible consequences of such changes.
1.3.3 Product liability and warranty
The operator shall bear responsibility for the suitability of the device for the specific purpose.
The manufacturer accepts no liability for the consequences of misuse by the operator. Improper
installation or operation of the devices (systems) will cause the warranty to be void. The
respective "Standard Terms and Conditions" which form the basis for the sales contract shall
also apply.
1.3.4 Information concerning the documentation
To prevent any injury to the user or damage to the device it is essential that you read the
information in this document and observe applicable national standards, safety requirements
and accident prevention regulations.
If this document is not in your native language and if you have any problems understanding the
text, we advise you to contact your local office for assistance. The manufacturer can not accept
responsibility for any damage or injury caused by misunderstanding of the information in this
document.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device. Special considerations and precautions are also described in the
document, which appear in the form of icons as shown below.

1 SAFETY INSTRUCTIONS
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1.3.5 Warnings and symbols used
Safety warnings are indicated by the following symbols.
• HANDLING
HANDLINGHANDLING
HANDLING
This symbol designates all instructions for actions to be carried out by the operator in the
specified sequence.
iRESULT
RESULTRESULT
RESULT
This symbol refers to all important consequences of the previous actions.
1.4 Safety instructions for the operator
DANGER!
This warning refers to the immediate danger when working with electricity.
DANGER!
This warning refers to the immediate danger of burns caused by heat or hot surfaces.
DANGER!
This warning refers to the immediate danger when using this device in a hazardous atmosphere.
DANGER!
These warnings must be observed without fail. Even partial disregard of this warning can lead to
serious health problems and even death. There is also the risk of seriously damaging the device
or parts of the operator's plant.
WARNING!
Disregarding this safety warning, even if only in part, poses the risk of serious health problems.
There is also the risk of damaging the device or parts of the operator's plant.
CAUTION!
Disregarding these instructions can result in damage to the device or to parts of the operator's
plant.
INFORMATION!
These instructions contain important information for the handling of the device.
LEGAL NOTICE!
This note contains information on statutory directives and standards.
WARNING!
In general, devices from the manufacturer may only be installed, commissioned, operated and
maintained by properly trained and authorized personnel.
This document is provided to help you establish operating conditions, which will permit safe and
efficient use of this device.

DEVICE DESCRIPTION 2
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2.1 Scope of delivery
2.2 Hardware description
The flowmeter is designed to meet explosion safety requirements:
•the application of an explosion proof (Ex d) electronics enclosure according to IEC 60079-1
•using Ex certified transducers according to IEC 60079-18
•using cables with an Ex d certified connector according to IEC 60079-1 to connect to the
transducers
The flowmeter consists of a meter body with one or two (twin or check meter) electronic units
installed on top of it.
For smaller diameters the meter body is fully machined hence no welding is done.
For larger diameters, normally the meter body is a welded construction. However, it can also be
a fully machined construction.
A series of acoustic transducer are installed on the inside of the meter body. Each pair of
ultrasonic transducers forms an acoustic measurement path. The acoustic measurement path
consists of one (direct) chord or two (reflective) chords.
The chords in the horizontal plane are used for flow measurement, the chords in the vertical
plane are used for diagnostics or for the measurement of the check meter. The reflective chords
that are offset from the meter’s centre line use acoustic mirrors to reflect the ultrasonic signal.
The reflective chords that are in the centre line of the meter reflect directly on the pipe wall.
Direct chords do not reflect and therefore do not require acoustic mirrors.
INFORMATION!
Do a check of the packing list to make sure that you have all the elements given in the order.
INFORMATION!
The instrument is delivered in a seaworthy, reinforced wooden crate. Inspect the packing
carefully for damages or signs of improper handling. Report damage to the carrier and to the
local office of the manufacturer.
Figure 2-1: Scope of delivery
1 Product documentation
2 CE Declaration
3 Flowmeter in ordered version
4 Optional: flow conditioner, spare parts and / or installed impact indicators
INFORMATION!
Calibration reports and project specific documents are in the meter's databook that is sent
separately.

2 DEVICE DESCRIPTION
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The transducers are electrically connected to the electronic unit on top of the meter by means of
coaxial cables. The cabling is protected against mechanical damage and moisture by means of
covers. The coaxial cables enter the electronics enclosure through its “foot”(or support). In this
foot an Ex d approved cable feed through is installed that closes this entry to the electronics
enclosure.
On the other side the coax cables are connected to the transducers, this connection is also done
by an Ex d approved connector.
2.2.1 Transducers
Acoustic signals are transmitted and received by means of ultrasonic transducers. The active
part of an ultrasonic transducer is a piëzo electric ceramic at the front of the transducer. The
front of the transducer is exposed to the gas to be measured. There is a variety of different
transducers to optimise the measurement performance to the application. Two of them are
shown as examples below.
Figure 2-2: Location of sensors and electronic unit
1 Standard version
2 Check version
Overview installation of epoxy transducer type (standard)
Figure 2-3: Sensor assembly
1 Double O-ring
2 Slot in the socket
3 Ex-d socket
4 Ex-d plug
5 Alignment pin
6 Cap
7 Securing screw M2
8 Coaxial wire
9 Transducer nut

DEVICE DESCRIPTION 2
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2.2.2 The electronic unit
The internal part of the housing is open. Every side of the “T-housing”has a removable cover that
gives access to the inside, in order to connect external wiring or to install or replace
components.
DANGER!
The transducers have an Ex-d socket (socket, 3) that connects to an Ex-d plug 4which
terminates a coaxial wire 8.
An alignment pin 5on the connector engages with a slot in the Ex-d socket 2, this ensures that
the transducer is connected with the correct polarity. The cap 6, screwed on the Ex-d socket,
fastens the connector, a small securing screw (M2) 7secures this cap. The transducers are
fastened in the meter body using a transducer nut with a hole in the centre 9. A double O-ring
1seals the pressure inside the piping effectively from the outside world.
Overview installation of titanium transducer type (optional)
Figure 2-4: Sensor assembly
1 Double O-ring
2 Ex-d socket
3 Connector
4 Hexagonal cap
5 Coaxial wire
6 Transducer nut
Figure 2-5: Converter housing
1 Power supply / RS485 compartment / Optional KROHNE Care board / Service ethernet / Logging SD card
2 Electronics / display / dip switches
3 Outputs (frequency / status / 4...20 mA)
INFORMATION!
If needed, ask your supplier for the optional KROHNE Care manual.

2 DEVICE DESCRIPTION
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Connection output side
On the right
rightright
right-hand side, all standard outputs are conducted with phoenix contacts, which are
delivered including the connector plugs. Wiring to other (external/auxiliary) equipment can be
connected to these terminals.
Cables can enter through the cable glands installed in either one or four threaded holes
M20x1.5.
Power supply / RS485 compartment
The left
leftleft
left-hand side is used to install the power converter. This board also includes two serial data
ports (RS485) and an Ethernet port and mini USB for service. Also an SD card can be inserted for
logging data. As an option an additional diagnostics processor board can be installed. Wiring to
external equipment or to a power source is attached to connectors with screw terminals. These
connectors engage directly with matching parts on the printed circuit boards.
Cables can enter this compartment through cable glands installed in either one of four threaded
holes M20x1.5.
Electronics compartment
The front has a cover with a glass window. It contains a frame with a number of printed circuit
boards. The boards have the following functions:
•Frequency and status output board
•Processor boards
•Sensor driver board
•Display module (connected to the front side of the frame, can be seen through the cover with
the glass window)
DANGER!
Unused holes must be closed with Ex d approved blind plugs.

DEVICE DESCRIPTION 2
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2.3 Software description
The ALTOSONIC V12 contains a powerful microprocessor that controls the functions and
calculations it performs. The microprocessor executes program code consisting of several
modules, according to the functions it has to perform. By means of a set of parameters the
software can be configured to various sizes and models of flowmeters and according to specific
requirements depending of applications or customers.
Individual parameters are classified according to “roles”in order to define differentiated access
rights. Each “role”is associated with a “typical”user or operator having specific responsibilities
or duties. Users have to be registered with a user name and a password, when registered the
role of the user is also defined, and by consequence also the access rights of that user.
The following roles have been defined, listed in according to the rank in the hierarchy.
Roles and authorisation
Only a higher rank user can register a lower rank user. Users can have the same rank.
In addition to restrictions depending of the defined role of a user, a physical “overwrite disable”
contact / jumper protects the configuration parameters. This disables any user from making
modifications to parameters that would influence the measured flow or volume value. This
prevents unintentional or unauthorized changes to the parameters and possibly invalidation of
the calibration.
Normally the meter is delivered with a set of parameters suitable for the application. In case a
modification of the configuration file is made, this is stored in the data logging memory. This
information can be retrieved afterwards for auditing and verification purposes.
LEGAL NOTICE!
The parameters are stored in a configuration file. Configuration parameters are password
protected in order to prevent unauthorized modification. Access in order to read, view and
inspect parameter values is unrestricted.
Operator restricted to personnel acting on behalf of the owner/ operator of the meter (for day
to day operation), to the discretion of the owner/operator of the meter.
Supervisor restricted to personnel acting on behalf of the owner/operator of the meter
(administrator function), to the discretion of the owner/operator of the meter.
Service restricted to authorized service personnel, to the discretion of KROHNE.
Service2 restricted to authorized service personnel, to the discretion of KROHNE with time
based password access. The time based password can be requested from KROHNE.
Calibrator restricted to personnel acting on behalf of a legal calibration station.
Factory restricted to KROHNE factory employees, to implement factory settings in the
meter.

2 DEVICE DESCRIPTION
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2.4 Nameplates
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.
Figure 2-6: Example of a ATEX nameplate
Figure 2-7: Example of a IECEx nameplate
Figure 2-8: Example of a CLASS I, DIV I nameplate

DEVICE DESCRIPTION 2
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Figure 2-9: Example of an FM Class I Division 2 nameplate
Figure 2-10: Example of a CSA nameplate

3 INSTALLATION
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3.1 Notes on installation
3.2 Storage
Correct storage position
Storage conditions
Maintain the following storage conditions to prevent the equipment from corrosion or early
failure:
•Humidity: <95 % RH (closed and heated storage area)
•Storage temperature: -40...+70ºC / -40...+158ºF
•Avoid direct solar radiation during long storage periods, store under a sunshade
How to prevent corrosion
Pay attention to the conservation of the inner pipe wall, especially for carbon steel meters.
Typical applications such as measuring dry natural gas (sales quality) or natural gas with a
corrosion inhibitor do not require an anti corrosion coating inside the meter tube. A coating can
even be regarded as unwanted because it may wear off, which will have an impact (although
minor) on the accuracy.
CAUTION!
Inspect the packaging carefully for damages or signs of rough handling. Report damage to the
carrier and to the local office of the manufacturer.
INFORMATION!
Do a check of the packing list to make sure that you have all the elements given in the order.
INFORMATION!
Look at the device nameplate to ensure that the device is delivered according to your order.
Check for the correct supply voltage printed on the nameplate.
Figure 3-1: Storage
1 Correct position for all sizes
2 Position not allowed for flowmeters > 12"
WARNING!
Make sure that the extensions on the bottom of the flanges are in good order to prevent the
meter from rolling over. Otherwise take appropriate measures to prevent the meter from rolling
over.

INSTALLATION 3
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However for storage and/or transportation additional protective measures are recommended.
Depending on how long the protection should last one of several methods can be considered:
1. For a storage period of less than one year, the inner pipewall should be protected by a corrosion
inhibitor such as Shell Ensys.
Do not apply the corrosion inhibitor on the acoustic transducers.
2. For a period of a year or longer, the pipewall should be protected by Tectyl or a similar product.
Do not apply Tectyl on the acoustic transducers.
3. Independend of the storage period, the inner pipewall can be protected by an oxygen free envi-
ronment. This can be created by mounting blind flanges, using a vacuum pump to remove the
air and subsequently filling the meter with nitrogen. It is recommended to place some bags of
silica gel inside the flowmeter. To protect against corrosion, the humidity should be less than
38% and/or oxygen should not be present. Special regulations may be applicable for transpor-
tation and storage of a pressurised flowmeter.
3.3 Transport
WARNING!
• Even smaller size flowmeters have a considerable weight. Check the weight of your
flowmeter in order to select suitable means for transportation and lifting.
• Use appropriate materials such as chains or hoisting straps that are in good condition.
• Use the eye bolts on the meter body to attach chains or straps to lift the meter (if not present:
check condition of the threaded holes on the flanges and if okay screw eye bolts in the
threaded holes).
• The supplied lifting lugs are for one time use only.
• Never lift the meter using the converter housing to attach straps.
• In case a fork lift will be used make sure that the flowmeter is secured against rolling off the
forks, or against straps sliding off the forks.
• Verify local safety regulations, directives and company procedures with respect to hoisting,
rigging and transportation of (heavy) equipment.

3 INSTALLATION
20
ALTOSONIC V12
www.krohne.com 01/2019 - 4002643505 - MA ALTOSONIC V12 R05 en
3.4 Pre-installation requirements
3.5 Installation
3.5.1 Mounting position
Install the ultrasonic gas flowmeter in horizontal position with the flow arrow indicator on the
nameplate or on the meter body in the direction of the positive (forward) gas flow.
Make sure that the converter is on top of the flowmeter after the installation.
Check the weight of the meter. Typically the weight of the meter will be considerably more than
the same length of pipe line.
To support the meter additional supports might be needed, preferably two, one on either side of
the meter.
Always support the meter at its flanges, the weight of the meter shall never rest on the case
around the transducers and the cabling.
If supports can not be placed under the meter flanges, supports may be placed under the mating
flanges of the pipeline. If supports can only be placed under the pipeline sections upstream or
downstream of the meter, these supports shall be as close as possible to the meter. In this case
a calculation must be made to verify that the load on the pipeline will not exceed acceptable
values.
INFORMATION!
The equipment is designed for safe operation under conditions according to the following
classifications:
• Pollution degree 2: this means that normally only nonconductive (dry) pollution will occur.
Temporary conductivity caused by condensation can occur.
• Protection class I: this means the equipment must be earthed.
• Humidity: <95% RH
• Ambient temperature: -40...+60 ° C / -40...+140 ° F
(ATEX / DIV1 / IECEx versions: -40...+65
° C / -40...+149 ° F)
• Suitable for indoor and outdoor use.
• IP66 / NEMA 4X classification.
CAUTION!
The flowmeter should be protected from corrosive chemicals or gases and dust or particles
accumulation.
CAUTION!
Do not intend to perform a hydrostatic test of the installed flowmeter.
The flowmeter has been hydrostatically tested during manufacturing (see reports) and must not
be retested with the ultrasonic sensors installed. Water will protude in the sensor pockets and
remain. This will create acoustic shortcuts and possibly cause the flowmeter to start operating
in failure.
DANGER!
To avoid the risk of ignition as a result of electrostatic charging, the equipment cannot be used in
locations where:
• high charge generating processes occur
• mechanical friction and/or separation can occur
• electron emission (e.g. near electrostatic equipment) can occur