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VA FLOWMETERS
VA FLOWMETERS
VA FLOWMETERSVA FLOWMETERS
Variable area flowmeters
without electrical built-ins
Equipment category II2G, II2D
Equipment category II2G, II2D
Equipment category II2G, II2DEquipment category II2G, II2D
Supplementary instructions
Supplementary instructions
Supplementary instructions Supplementary instructions
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CONTENTS
VA FLOWMETERS
1 General notes 3
2 Safety instructions 4
2.1 Flammable products ........................................................................................................ 4
2.2 Device category ................................................................................................................ 4
2.3 Protection types................................................................................................................ 5
2.4 Surface temperature........................................................................................................5
2.5 Static electricity................................................................................................................ 6
2.5.1 Process dependent charging.................................................................................................. 6
2.5.2 Charging non-conductive external parts by cleaning ............................................................ 6
2.6 Device-specific notes ....................................................................................................... 7
3 Description 11
3.1 Description code............................................................................................................. 11
3.2 Marking........................................................................................................................... 11
4 Installation 13
4.1 Mounting and installation............................................................................................... 13
4.2 Special conditions........................................................................................................... 13
5 Operation 14
5.1 Initial start-up................................................................................................................. 14
5.2 Operation ........................................................................................................................ 14
6 Service 15
6.1 Maintenance ................................................................................................................... 15
6.2 Dismantling .................................................................................................................... 16
7 Notes 17
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VA FLOWMETERS
INFORMATION!
These additional operating instructions apply to explosion-protected, non-electrical versions of
variable area flowmeters.
•
DK32 DK34
•
DK37/M8M
•
H250/M8MG
•
H250/M9
•
H250/M40
•
DK46 DK47 DK48 DK800
•
GA24
•
VA40
in the categories
•
II2G
•
II2D
They complement the Installation and Operation Instructions for the non-explosion protected
versions. The information given in these Instructions contains only the data relevant to explosion
protection. The technical details given in the Installation and Operation Instructions for the nonexplosion protected versions apply unchanged unless excluded or superseded by these
Instructions. The series of the non-electrical versions of variable area flowmeters listed above
have been tested in accordance with
GENERAL NOTES 1
EN 13463-1:2009
EN 13463-1:2009
EN 13463-1:2009EN 13463-1:2009
EN 13463-5:2011
EN 13463-5:2011
EN 13463-5:2011EN 13463-5:2011
by the manufacturer.
The testing documentation has been stored in accordance with item 8, section 1b ii of the
directive 94/9/EG (ATEX) at the Physikalisch- Technischen Bundesanstalt (PTB), Braunschweig,
Germany under the registration number:
PTB 03 ATEX D127 X
PTB 03 ATEX D127 X
PTB 03 ATEX D127 XPTB 03 ATEX D127 X
.
The devices have identical designs in categories II2G and II2D.
Non-electrical devices for use
Non-electrical devices for use
Non-electrical devices for useNon-electrical devices for use
in hazardous areas
in hazardous areas
in hazardous areasin hazardous areas
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2 SAFETY INSTRUCTIONS
2.1 Flammable products
Atmospheric conditions:
Atmospheric conditions:
Atmospheric conditions:Atmospheric conditions:
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions. The following values define it
= -20...+60°C / -4...+140°F and P
T
atm
Outside of this range, no key data are available as to ignition behaviour for most mixtures.
Installation condititions:
Installation condititions:
Installation condititions:Installation condititions:
Variable area flowmeters operate outside of atmospheric conditions, which means that
explosion protection according to Directive 94/9/EC (ATEX) – regardless of the zone assignment
– is fundamentally not applicable due to the lack of key safety data for the interior of the
measuring section.
WARNING!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. The operator is responsible
for ensuring that the flowmeter is operated safely as regards the temperature and pressure of
the products used. In case of operation with flammable products the measuring units must be
included in the periodic pressure tests of the system. When using the device version H250/C...
(PTFE-liner, nonconductive) the min. conductivity of the medium must be 10
avoid the electrostatic charge.
= 0.8...1.1 bar.
atm
VA FLOWMETERS
-8
S/m, in order to
2.2 Device category
Variable area flowmeters are designed in Category II 2 G / II 2 D for use in zone 1 or zone 2 and
zone 21 or zone 22. The inside of the measuring unit is also approved for zone 1.
INFORMATION!
Definition of zone 1 acc. to EN 1127-1, Appendix B:
An area in which an explosive atmosphere may occasionally occur as a result of the mixture of
flammable substances in the form of gas, steam or mist with air under normal operation.
Definition of zone 21 acc. to EN 1127-1, Appendix B:
An area in which an explosive atmosphere may occasionally occur in the form of a cloud of
flammable dust in the air under normal operation.
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VA FLOWMETERS
2.3 Protection types
Non-electrical variable area flowmeters are designed in the protection class "design safety 'c'"
in accordance with EN 13463-5.
SAFETY INSTRUCTIONS 2
The marking is: II 2GD c IIC TX
The marking contains the following information:
The marking contains the following information:
The marking contains the following information:The marking contains the following information:
II
II Group II explosion protection
IIII
2222 Equipment category 2
GGGG Gas explosion protection
DDDD Dust explosion protection
cccc Protection through design safety
IIC
IIC Gas group, Suitable for gas groups IIC, IIB and IIA
IICIIC
TX
TX Surface temperature is determined by operating conditions
TXTX
II 2GD c IIC TX
II 2GD c IIC TXII 2GD c IIC TX
2.4 Surface temperature
It is to be assumed that a combustible fuel / air mixture can contact the outer wall of the
measuring tube and process connections. Any temperature gradient between the internal wall in
contact with the product (product temperature) and the outer surface is not taken into
consideration.
The actual maximum surface temperature does not depend on the device itself, but instead on
the operating conditions. The device itself does not generate heat and, for this reason, the
surface temperature is determined by the product temperature and, in versions with heating
jackets, by the heating medium temperature as well.
A TX identifier on the nameplate refers to this in accordance with EN 13463-1:2009, section 9.3.2
f. The maximum permitted ambient and product temperature can be found in the standard
operating instructions.
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2 SAFETY INSTRUCTIONS
2.5 Static electricity
2.5.1 Process dependent charging
In variable area flowmeters, it is possible under field conditions for charge separation to occur in
the measuring tube due to the transport of non-conductive fluids and/or when the flow comes
into contact with non-conductive built-ins (e.g. liners, floats).
For all metal devices, the measuring tube and the welded on process connections form a shield
(Faraday cage) from which the electrical field cannot escape.
In glass devices, it is basically possible for the electrostatic field generated inside the measuring
tube to "punch through" to the outside of the device. For that reason, variable area flowmeters
need to be permanently grounded by the operator by way of the process connections in order to
allow discharge of electrostatic charges.
The operator is also responsible for extending the ground continuity of the process pipeline. If
grounding cannot be made via the process connections (plastic process connections or
undefined connections), the measuring device should be connected to the described ground
potential via the connection to ground. This connection merely ensures electrostatic grounding
of the device and does not meet the requirements for equipotential bonding.
VA FLOWMETERS
CAUTION!
Use of the equipment is not permitted in areas where the following occur: processes that
generate strong charges, machine grinding and separation processes, electron spraying (e.g.
near electrostatic painting systems) or pneumatically conveyed dust.
2.5.2 Charging non-conductive external parts by cleaning
Area limits are taken into consideration with respect to the chargeability of non-conductive
external parts under atmospheric conditions. Devices for which it can be expected that
combustible electrostatic charging will occur due to cleaning are to be identified with an
adhesive sign:
CAUTION!
Achtung! Gefahr elektrostatischer Aufladung! Nicht reiben!
Caution! Risk of electrostatic charge! Do not rub!
A cloth moistened with water should be use to clean surfaces that could be loaded with a charge.
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VA FLOWMETERS
2.6 Device-specific notes
If the process connections do not establish an adequate electrostatic ground for the device, a
supplementary ground connection must be established using the earth screw 1111.
DK32 - DK34
SAFETY INSTRUCTIONS 2
DK37/M8M
INFORMATION!
The display housing is made of conductive plastic. Friction cannot cause electrostatic charge.
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2 SAFETY INSTRUCTIONS
H250/M9
In hazardous areas, only operate the display with a closed cover.
CAUTION!
When using a viewing panel made of polycarbonate, note the label information:
Achtung! Gefahr elektrostatischer Aufladung! Nicht reiben!
Caution! Risk of electrostatic charge! Do not rub!
VA FLOWMETERS
H250/M40
In hazardous areas, only operate the display with a closed cover.
1 Grounding in the display
2 External grounding
INFORMATION!
Grounding 1 and 2 are equivalent
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VA FLOWMETERS
H250/M8MG
INFORMATION!
The display housing is made of conductive plastic. Friction cannot cause electrostatic charge.
SAFETY INSTRUCTIONS 2
DK46 - DK47 - DK48 - DK800
When measuring gases or liquids that are not contaminated, risk of combustion due to
electrostatic charge is not be expected if the rate of flow does not exceed a rate 20 times that of
the nominal rate of flow. The max. allowable working pressure PS printed on the nameplate may
not be exceeded!
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2 SAFETY INSTRUCTIONS
GA24
When measuring gases or liquids that are not contaminated, risk of combustion due to
electrostatic charge is not be expected if the rate of flow does not exceed a rate 10 times that of
the nominal rate of flow. The max. allowable working pressure PS printed on the nameplate may
not be exceeded!
VA FLOWMETERS
VA40
When measuring gases or liquids that are not contaminated, risk of combustion due to
electrostatic charge is not be expected if the liquid does not have a conductivity of less than 1000
pS/m and the rate of flow does not exceed a rate 10 times that of the nominal rate of flow. The
max. allowable working pressure PS printed on the nameplate may not be exceeded!
CAUTION!
The viewing panel is made of polycarbonate. Note the label information:
Achtung! Gefahr elektrostatischer Aufladung! Nicht reiben!
Caution! Risk of electrostatic charge! Do not rub!
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VA FLOWMETERS
3.1 Description code
The applicable description code is that given in the standard Installation and Operating
Instruction.
3.2 Marking
The flow meters are identified by the following nameplates:
(examples are not to scale)
Nameplate DK32 DK34
DESCRIPTION 3
Nameplate H250/M9 - H250/M40 - DK37/M8M - H250/M8MG
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3 DESCRIPTION
Nameplate VA40 - GA24 - DK46 - DK47 - DK48 - DK800
CAUTION!
The value information on the nameplates (identified by xxx) is subject to the individual device
versions and can be found on the respective nameplate or operating instructions of the device.
• 0035 - Identification number of the monitoring body for the EC Pressure Equipment directive
97/23/EC
• SN - Series number and/or PA - Production order number
• MD - manufacturing date
• PS - max. operating pressure PS (pressure specified)
• PT max. - Pressure test max.
• Max. operating temperature TS (temperature specified)
• PED - Pressure Equipment Directive key
• Tag no. - Tag identifier
• Reg. no. - Registration number of named location
• Tamb. - max. permitted ambient temperature
• VG - V number Germany
• SO - Sales order number
• PA - KROHNE order number
• AC - article code
VA FLOWMETERS
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VA FLOWMETERS
4.1 Mounting and installation
In conformity with the operative installation standards for hazardous areas, mounting and
installation work is required to be carried out by specialist personnel who have received training
in explosion protection.
The directions given in the standard Installation Instruction and in these Additional Installation
and Operating Instruction should be followed without fail.
Verify the suitability of the VA flowmeters for the application in question by checking the data
given on the nameplate. Check compatibility of the process product with the wetted parts against
the data specified in the order.
4.2 Special conditions
Mechanical tests
The flow meters were subjected to a shock text in accordance with EN 13463-1.
• Equipment group - II
• Degree of mechanical risk - low
• Additional markings - X
INSTALLATION 4
If the degree of mechanical risk is greater, additional protective measures must be taken.
Item Impact energy (joules)
Measuring units, valves,
regulators
DK32, DK34 4 n/a
DK37/M8M 4 n/a
H250/M8MG 4 n/a
H250/M9 4 n/a
H250/M40 4 n/a
DK46,DK47,DK48,DK800 4 2
GA24 4 2
VA40 4 2
Inspection glass,
Protective cover, transparent
INFORMATION!
Testing is not required for the viewing panel for all metal variable area flowmeters. With regard
to explosion protection for these devices, the intact state of the viewing panel is not important.
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5 OPERATION
5.1 Initial start-up
Before initial start-up, test the materials used for the measuring section and for the gaskets for
adequate resistance to corrosion from the process product.
5.2 Operation
Variable area flowmeters must be operated in such a way that they remain within the maximum
and minimum permissible temperatures and pressures and the electrical limit values.
Variable area flowmeters may only be operated if the equipment parts necessary for safety are
effective in the long run, and are not rendered inoperable during operation.
When it comes to flammable products, the measuring sections must be included in the periodic
pressure tests of the system.
Opening the housing of the electronics compartment (equipment protection by flameproof
enclosure or dustproof housing) in hazardous areas is only permitted in a de-energised state.
VA FLOWMETERS
WARNING!
Ignition risks caused by pressure surges, impact or friction must particularly be avoided when
titanium measuring units are used.
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VA FLOWMETERS
6.1 Maintenance
Indicator
The measuring and indicating sections are maintenance-free under normal operating conditions
and when used for the designated purpose.
Measuring section
The measuring section is maintenance-free under normal operating conditions and when used
for the designated purpose.
Depending on application, however, the measurement function may in unfavourable cases
become impaired through soiling of the measuring cone or the float.
The measuring section should be cleaned as described in the Installation and Operating
Instruction for the non-hazardous-duty versions.
The measuring section must be dismantled before it can be cleaned. In this connection, note the
information given under “Replacement of the complete flowmeter“.
SERVICE 6
Within the scope of checks required to be carried out in hazardous areas to maintain systems in
proper working order, the following visual inspections should be carried out at regular intervals:
• Check of the measuring section for leakages.
• Inclusion of the flowmeter in the periodic pressure tests of the process pipeline.
Maintenance
Maintenance work of a safety-relevant nature within the meaning of explosion protection may
only be carried out by the manufacturer, his authorized representative or under the supervision
of authorized inspectors.
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6 SERVICE
6.2 Dismantling
Replacing the indicator
Due to the modular structure of the variable area flowmeters, from a safety perspective the
display can be replaced with identical KROHNE spare parts.
In this case, the measuring tube can remain in the pipeline. This also applies for pressurized
pipes.
CAUTION!
There may be a loss of measuring accuracy!
Exchanging the entire device
CAUTION!
•
Pressurized pipes have to be depressurized before removing the measuring unit.
•
Avoid uncontrolled discharge of residual fluid from the measuring unit.
•
Where environmentally critical products are concerned, carefully decontaminate the wetted
parts of the measuring tube after dismantling.
•
Removal and installation are the responsibility of the operator.
VA FLOWMETERS
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VA FLOWMETERS
NOTES 7
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7 NOTES
VA FLOWMETERS
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VA FLOWMETERS
NOTES 7
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KROHNE product overview
• Electromagnetic flowmeters
• Variable area flowmeters
• Ultrasonic flowmeters
• Mass flowmeters
• Vortex flowmeters
• Flow controllers
• Level meters
• Temperature meters
• Pressure meters
• Analysis products
• Products and systems for the oil & gas industry
• Measuring systems for the marine industry
Head Office KROHNE Messtechnik GmbH
Ludwig-Krohne-Str. 5
47058 Duisburg (Germany)
Tel.:+49 (0)203 301 0
Fax:+49 (0)203 301 10389
info@krohne.de
The current list of all KROHNE contacts and addresses can be found at:
© KROHNE 11/2012 - 4000419904 MA VA Mech Ex AD R04 en - Subject to change without notice.
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