Page 1
DWM/A-L Module ATEX
Flow Monitor
Operating Instructions
Flow monitor for use
in explosion-hazard zones
Series DWM/A-L
Typ DWM/A-L1,5 thru DWM/AL100
Read the instructions prior to performing any task!
Page 2
DWM/A-L Module ATEX, 1, en_US
© Meister Strömungstechnik GmbH 2014
Meister Strömungstechnik GmbH
Im Gewerbegebiet 2
63831 Wiesen
Germany
Telephone: +49 6096 9720 - 0
Fax: +49 6096 9720 - 30
Email: sales@meister-flow.com
Internet: www.meister-flow.com
These instructions were compiled by:
Meister Strömungstechnik GmbH
Subject to change without notice
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These instructions facilitate the safe
and efficient handling of a flow monitor
(referred to as "device" in the following). The instructions are an integral part of the device and must be
kept within easy reach for the personnel in the immediate vicinity of the
device at all times. Personnel must
carefully read and understand these
instructions before commencing all
work. The basic requirement for safe
work is adherence to all safety and
handling instructions stipulated in
these instructions. The local accidentprevention regulations and general
safety standards and regulations for
the field of application of the device
also apply. Illustrations in these
instructions are provided to aid general
understanding and might deviate from
the actual model. No claims can be
derived from any such differences.
Limitations of liability
All details and instructions in this
manual have been compiled under
consideration of the valid standards
and regulations, the current state-oftechnology and our many years of
knowledge and experience. The manufacturer does not accept any liability
arising from:
n non-observance of any details in
these instructions
n improper use of the device, or use
that is not in accordance with
these instructions
n use of non-trained personnel
n unauthorized retrofitting or tech-
nical changes that have not been
authorized by the manufacturer
n use of non-approved replacement
parts
The duties and obligations agreed
upon in the delivery contract apply in
full, as well as the general terms and
conditions, the terms of delivery by the
manufacturer and the valid legal regulations applicable at the conclusion of
the contract.
Copyright
These operating instructions are protected by copyright.
Except for internal purposes, transfer
of these instructions to third-parties,
copying them in any way
– even in part –
as well as dissemination and/or communication of their content is forbidden without prior written
authorization from Meister Strömungstechnik ("manufacturer"). Violations
are subject to claims for indemnification. The manufacturer reserves the
right to assert additional claims.
Copyright is the property of the manufacturer.
© Meister Strömungstechnik GmbH
Im Gewerbegebiet 2
63831 Wiesen
Germany
Supplemental instructions
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Table of contents
1
Overview...................................................................................................... 6
1.1 Short description.................................................................................. 6
1.2 Warranty and guarantee provisions..................................................... 6
1.3 Customer service................................................................................. 6
2 Safety........................................................................................................... 7
2.1 Explanation of symbols........................................................................ 7
2.2 Correct use in explosion-hazard zones................................................ 8
2.3 Special precautions for use in explosion-hazard zones..................... 10
2.3.1 Precautions for use in explosion-hazard zones.............................. 10
2.4 Personnel requirements..................................................................... 12
2.5 Personal safety equipment................................................................. 13
2.6 Protective systems............................................................................. 13
3 Areas of employment............................................................................... 14
3.1 Mechanical component (flow meter without limit switch contacts and
electrical accessories)........................................................................ 14
3.1.1 Exterior of the device...................................................................... 14
3.1.2 Interior of the device........................................................................ 14
3.1.3 General safety information for the mechanical component of the
device.............................................................................................. 15
3.1.4 Categorization of the mechanical component of the flow monitor... 16
3.1.5 List of media.................................................................................... 19
3.1.6 Applicable documents..................................................................... 21
3.2 Electrical component of the device (limiting contacts)....................... 24
3.2.1 Categorization of the electrical component of the flow monitor
(limit switch contacts)...................................................................... 24
3.2.2 Applicable documents..................................................................... 24
4 Operating data.......................................................................................... 36
4.1 Operating data for the mechanical component of the device............. 36
4.2 Switch contact operating data............................................................ 36
5 Transport, packaging and storage.......................................................... 38
Table of contents
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6 Installation and initial startup.................................................................. 39
6.1 Safety................................................................................................. 39
6.2 Tools.................................................................................................. 39
6.3 Protection of the flow monitor............................................................. 39
6.4 Electrical connection.......................................................................... 39
6.5 Grounding the device......................................................................... 39
6.6 Contact protection measures............................................................. 39
7 Operation................................................................................................... 41
8
Troubleshooting....................................................................................... 42
9 Maintenance.............................................................................................. 43
9.1 Return Materials................................................................................. 43
9.1.1 Return Materials Authorization........................................................ 43
10 Dissambly and disposal........................................................................... 44
11 Technical data........................................................................................... 45
11.1 Dimension sheet.............................................................................. 45
11.2 General specifications...................................................................... 48
11.3 Replacement parts........................................................................... 50
12 Appendix................................................................................................... 56
13 Index.......................................................................................................... 57
Table of contents
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1 Overview
1.1 Short description
Fig. 1: DWM/A-L flow monitor
1 Switchpoint adjustment scale
2 Explosion-proof switch contact
with cast-on power cable
3 Mechanical indicator with display
scale and pointer
The flow monitor DWM/A monitors the
continuous flow of gaseous media. It is
designed for installation in pipe systems.
A float inside the device is moved by
the medium flowing through it. The
desired switch point can be set on the
switchpoint adjustment scale, whereby
the arrow on the switch contact is
aligned to the desired volume flow
value on the adjustment scale. The
pointer on the mechanical indicator
shows the actual flow rate.
Electrical monitoring is accomplished
by explosion-proof switch contacts.
The electrical connection is via the cast
on power cable.
1.2
Warranty and guarantee provisions
Warranty and guarantee provisions are
contained in the general terms and
conditions of the manufacturer.
1.3 Customer service
For technical information, please contact our customer service department
(for contact details, see Page 2).
Furthermore, our staff is always interested in receiving new information and
experiences gained from application of
the device, which might be useful in
improving our products.
Overview
Customer service
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2 Safety
This Chapter provides an overview of
important safety aspects required for
optimum protection of personnel as
well as for safe installation and safe
operation of the device.
Non-observance of the handling and
safety instructions listed in this manual
may result in hazardous/dangerous situations and in damage to property.
2.1 Explanation of symbols
Safety instructions
Safety instructions in this manual are
marked by symbols. The safety instructions are preceded by signal words that
indicate the level of danger/hazard.
To prevent accidents or injuries to persons as well as damage to property,
always observe the safety instructions
and proceed carefully.
DANGER!
This combination of symbol and
signal word indicates an immediate, dangerous situation that
results in death or serious injury if
it is not avoided.
WARNING!
This combination of symbol and
signal word indicates a possibly
dangerous situation that might
result in death or serious injuries if
it is not avoided.
Safety
Explanation of symbols
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CAUTION!
This combination of symbol and
signal word indicates a possibly
dangerous situation that might
result in minor or slight injuries if it
is not avoided.
NOTICE!
This combination of symbol and
signal word indicates a possibly
dangerous situation that might
result in damage to property and to
the environment if it is not avoided.
Tips and recommendations
This symbol emphasizes useful
tips and recommendations as well
as information for efficient and
failure-free operation.
Signs used in these instructions
The following symbols and highlighting
are used in these instructions to identify handling instructions, the description of results, lists/enumerations, references and other elements:
Designates step-by-step handling instructions.
ð
Designates a state or an
automatic sequence as a
result of a specific operating
step.
n Designates randomly ordered enu-
merations and list entries
Ä
“Signs used in these instructions”
on page 8, designates references to
chapters in these instructions.
2.2 Correct use in
explosion-hazard
zones
The device is designed and constructed exclusively for the correct use
in accordance with these instructions.
The flow monitor serves exclusively for
monitoring the continuous flow of gaseous media.
The areas of application are specified
in Chapter 3 of these instructions.
The admissible operating conditions
are specified in Chapter 4 of these
instructions.
Safety
Correct use in explosion-hazard zones
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Correct use of the device includes the
observance of all specifications in the
Operating Instructions for "DWM/A-L
Module BASICS" and "DWM/A-L
Module ATEX".
Any addition or different application,
above and beyond the correct use in
accordance with these instructions, is
deemed as incorrect use.
WARNING!
Danger due to incorrect use!
– Use the flow monitor only
within the stipulated performance limits
–
Do not subject the flow monitor to severe temperature fluctuations
– Do not use the flow monitor
with quick-acting valves
– Do not use the flow monitor
with solenoid valves
– Do not subject the flow mon-
itor to vibrations
– Do not subject the flow mon-
itor to pressure surges
– Do not use the flow monitor
with media containing solids or
abrasives
– Only use the flow monitor with
media previously approved by
the manufacturer
– Do not use the flow monitor as
the sole monitoring device to
prevent dangerous conditions
– Do not install the flow monitor
as a load bearing part within a
pipeline system
– The flow monitor must be
installed so, as to preclude
damage by outside force. If
necessary, install an appropriate impact protection device
– The flow monitor may be
installed in explosion-hazard
zones only if:
Safety
Correct use in explosion-hazard zones
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– the marking on the flow
monitor,
–
the marking on the switch
unit installed on the flow
monitor,
– and the information con-
tained in the accompanying documentation
(Operating Instructions
"DWM/A-L Module
BASICS" and "DWM/A-L
Module ATEX") authorize
such installation and operation
– Planning and design of equip-
ment, protective systems and
components is the responsibility of the facility operator
– The facility operator must con-
sider the possible effects in
case of an explosion
– The facility operator is respon-
sible for the substitution, or the
reduction of the quantity of
substances, which may cause
an explosive atmosphere
All claims for damages due to incorrect
use are excluded. .
Incorrect use of the flow monitor may
result in dangerous situations.
2.3 Special precautions
for use in explosionhazard zones
The following chapter lists residual
risks that might arise from the device.
To reduce health risks and prevent
dangerous situations, observe the
safety instructions listed here, the
safety instructions listed in other chapters of these Operating Instructions, as
well as all safety instructions listed in
the Operating Instructions for "DWM/AL Module BASICS"
These Operating Instructions
cannot cover all conceivable dangers because many dangers arise,
not from the device itself, but from
the respective media flowing
through it. Always observe the
instructions on the appropriate
safety data sheets when using
hazardous media!
2.3.1 Precautions for use
in explosion-hazard
zones
Safety
Special precautions for use in explosion-hazard zones > Precautions for use in explosion-hazard zones
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DANGER!
Danger to life from explosions
– Potentially explosive dust-air
mixtures and hybrid mixtures
are not permitted inside the
flow meter/flow monitor and
must be excluded by the operator!
–
Dust accumulations are not
permitted, neither inside the
flow meter/flow monitor, nor
on the outside surface and
must be excluded by the operator! When cleaning, do not
use dry cloths!
– To avoid electrostatic charges
capable of resulting in dangerous situations, the following requirements must be
met:
– All conductive parts,
capable of electrostatic
charging, must be connected and grounded.
– Dangerous electrostatic
charging of non-conductive parts and materials,
including solids, fluids and
dust, must be avoided.
– Ignitable discharges must
be excluded.
– Chemical reactions, pyrolysis
or biological processes inside
the flow meter/flow monitor
are not permitted and must be
excluded by the operator.
– Intrusion of foreign materials
which can generate sparks, is
not permitted and must be
excluded by the operator.
–
Friction, which may cause
local heat build-up and
sparking, is not permitted and
must be excluded by the operator!
– Impact processes, involving
materials such as rust or light
alloys (e.g. aluminum or magnesium) are not permitted and
must be excluded by the operator.
– High voltage and currents that
may cause sparking are not
permitted and must be
excluded by the operator.
– Electromagnetic waves in a
frequency range between 10
4
to 3×1012 Hz, as may be found
in the vicinity of radio broadcasting stations or high-frequency generators, are not
permitted and must be
excluded by the operator.
– Electromagnetic waves in a
frequency range between
3×1011 to 3×1015 Hz, which
can occur as radiation from
protective systems or components (e.g. lamps, arc lamps,
lasers), are not permitted and
must be excluded by the operator.
Safety
Special precautions for use in explosion-hazard zones > Precautions for use in explosion-hazard zones
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– Devices which can focus radi-
ation, and which can provide
an ignition source for particles
and surfaces, are not permitted and must be excluded
by the operator.
–
Ionizing radiation, which
exceeds the minimum ignition
temperature of the surrounding combustible atmosphere, is not permitted and
must be excluded by the operator.
– Ultrasound sources, which can
ignite the sonicated material,
are not permitted and must be
excluded by the operator.
– Adiabatic compression and
shock waves are not permitted
and must be excluded by the
operator.
– Exothermic reactions,
including auto-ignition of dust,
is not permitted and must be
excluded by the operator.
2.4 Personnel requirements
WARNING!
Risk of injury due to insufficiently trained and qualified personnel!
If unqualified personnel work on
the device or are located within its
hazard zone, dangers arise which
may result in serious injuries and
considerable damage to property.
– All work must be performed by
qualified personnel only
–
Keep unqualified personnel
away from hazard zones
The personnel requirements, as formulated in the Operating Instructions for
"DWM/A-L Module BASICS" Chapter
2.4, are valid. For employment within
explosion-hazard zones, only trained
and qualified personnel may be used.
Responsibility for the choice of personnel and their qualification rests with
the facility operator. The requirements
for standards DIN EN 60079-14 and
DIN EN 60079-17 must be taken into
consideration.
Refer also to the Operating Instructions
"DWM/A-L Module BASICS", Chapter
2.9 "Responsibility of the owner".
Authorized personnel is to be restricted
to those persons who can be expected
to carry out their work reliably. Persons
whose ability to respond is influenced,
e.g. by drugs, alcohol or medication,
are not authorized.
Safety
Personnel requirements
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Observe the age and occupational regulations at the site when choosing personnel.
2.5
Personal safety
equipment
Personal safety equipment is used to
protect personnel from hazards/dangers that might impair their safety or
health during work.
When performing the various tasks at,
and with the device, personnel must
wear personal safety equipment. Special reference to this equipment is
made in the Operating Instructions for
"DWM/A-L Module BASICS". The
facility operator must ensure that the
protective clothing used in explosionhazard zone is suitable and approved.
2.6 Protective systems
The design of the safety features is
described in the Operating Instructions
"DWM/A-L Module BASICS". The
operator must ensure that all applicable regulations which apply to operation in an explosion-hazard zone are
met.
Safety
Protective systems
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3 Areas of employment
3.1 Mechanical component (flow meter
without limit switch
contacts and electrical accessories)
3.1.1
Exterior of the
device
n Devices of the DWM/A-L type may
be employed in areas in which an
explosive atmosphere, composed
of a gas/air- or dust/air- mixture,
may occasionally occur. The exterior of the device may therefore be
suitably located in explosion
hazard zone 1, zone 2, zone 21, or
zone 22.
n Dust accumulations are not per-
mitted; neither internally, nor on
the outside surface of the flow
meter/flow monitor and must be
excluded by the operator.
3.1.2 Interior of the device
n Internal to the device, only those
flow media ma be used, to which
the following applies:
n the media is listed on the media
list (Chapter 3.1.5), and
n the medium is not aggressive to
the wetted parts of the device, and
n the device is approved by the
manufacturer for use with the
medium.
n It is permissible to occasionally
have an explosive gas/air mixture
inside the device (explosion
hazard zone 1). At no time may
gasses of explosion hazard group
IIC (e.g. hydrogen or acetylene) be
present in the interior of the
device.
n Explosive dust-air mixtures and
hybrid mixtures are not permitted
inside the flow meter/flow monitor
and must be excluded by the operator.
n Chemical reactions, pyrolysis or
biological processes inside the
flow meter/flow monitor are not
permitted and must be excluded
by the operator.
n The entry of foreign materials that
may produce sparks is not permitted and must be excluded b the
operator.
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Interior of the device
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3.1.3 General safety information for the
mechanical component of the device
n Dust accumulation are not per-
mitted; neither internally, nor on
the outside surface of the flow
meter/flow monitor and must be
excluded by the operator. When
cleaning, do not use dry cloths!
n In case of hazard through static
electricity, the following requirements must be met:
– All conductive parts capable of
charging themselves electrostatically must be connected
and grounded.
– Dangerous electrostatic
charging of non-conductive
parts and materials, including
solids, fluids and dust, must
be avoided.
– Ignitable discharges must be
excluded.
n Friction, which may cause local
heat build-up and sparking, is not
permitted and must be excluded
by the operator.
n Impact processes involving mate-
rials such as rust or light alloys
(e.g. aluminum or magnesium) are
not permitted and must be
excluded by the operator.
n High voltage and currents that may
cause sparking are not permitted
and must be excluded by the operator.
n Electromagnetic waves in a fre-
quency range between 104 to
3×1012 Hz, as may be found in the
vicinity of radio broadcasting stations, or high-frequency generators, are not permitted and must
be excluded by the operator.
n Electromagnetic waves in a fre-
quency range between 3×1011 to
3×1015 Hz, which can occur as
radiation from protective systems
or components (e.g. lamps, arc
lamps, lasers), are not permitted
and must be excluded by the operator.
n Devices which can focus radiation,
and which can provide an ignition
source for particles and surfaces,
are not permitted and must be
excluded by the operator.
n Ionizing radiation, which exceeds
the minimum ignition temperature
of the surrounding combustible
atmosphere, is not permitted and
must be excluded b the operator.
n Ultrasound sources, which can
ignite the sonicated material, are
not permitted and must be
excluded by the operator.
n Adiabatic compression and shock
waves are not permitted and must
be excluded by the operator.
n Exothermic reactions, including
auto-ignition of dust, are not permitted and must be excluded by
the operator.
n The device must be installed in
such a way as to preclude damage
by outside force. It is the responsibility of the operator to install
appropriate protective devices.
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > General safety information for the mechanical compo-
nent of the device
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3.1.4 Categorization of the
mechanical component of the flow
monitor
n Equipment group
internal: II
external: II
n Equipment category
internal: 2
external: 2
n Atmosphere
internal: Gas (G)
external: Gas (G), Dust (D)
n Gas group
internal: IIB
external: IIC
n Temperature classification
internal: TX
external: TX
n Operating temperatures for device
without limit switch contacts
The maximum media tempera-
ture for a device without limit
switch contacts must be less
than:
–
the ignition temperature of the
medium and
– the ignition temperature of the
atmosphere surrounding the
device and
– less than or equal to 80 °C
It is the responsibility of the operator to ensure that these requirements are met concurrently.
The minimum media tempera-
ture for a device without limit
switch contactsmust be higher
than or equal to - 20 °C.
It must be ensured that the
medium does not freeze.
The maximum ambient tempera-
ture for a device without limit
switch contacts must be less
than:
– the ignition temperature of the
medium and
– the ignition temperature of the
atmosphere surrounding the
device and
– less than or equal to 80 °C
It is the responsibility of the operator to ensure that these requirements are met concurrently.
The minimum ambient tempera-
ture for a device without limit
switch contacts must be higher
than or equal to - 20 °C.
n Operating temperatures for a
device with the following limit
switch contacts:
Explosion proof switch contacts
with design examination:
PTB 03 ATEX 2154 X
II 2 G Ex mb II T6
II 2 D Ex tD A21 IP67 T80 °C
The maximum media tempera-
ture for a device with these limit
switch contacts must be less
than:
–
the ignition temperature of the
medium and
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Categorization of the mechanical component of the
flow monitor
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the ignition temperature of the
atmosphere surrounding the
device and
–
less than or equal to 75 °C
It is the responsibility of the operator to ensure that these requirements are met concurrently
The minimum media tempera-
ture for a device with these limit
switch contacts must be higher
than or equal to - 20 °C .
It must be ensured that the
medium does not freeze
The maximum ambient tempera-
ture for a device with these limit
switch contacts must be less
than:
– the ignition temperature of the
medium and
– the ignition temperature of the
atmosphere surrounding the
device and
– less than or equal to 75 °C
It is the responsibility of the operator to ensure that these requirements are met concurrently.
The minimum ambient tempera-
ture for a device with these limit
switch contacts must be higher
than or equal to - 20 °C.
n Operating temperatures for a
device with the following limit
switch contacts:
Explosion proof switch contacts
with design examination:
PTB 03 ATEX 2154 X
II 2 G Ex mb II T5
II 2 D Ex tD A21 IP67 T100 °C
The maximum media tempera-
ture for a device with these limit
switch contacts must be less
than:
– the ignition temperature of the
medium and
– the ignition temperature of the
atmosphere surrounding the
device and
– less than or equal to 80 °C
It is the responsibility of the operator to ensure that these requirements are met concurrently
The minimum media tempera-
ture for a device with these limit
switch contacts must be higher
than or equal to - 20 °C.
It must be ensured that the
medium does not freeze.
The maximum ambient tempera-
ture for a device with these limit
switch contacts must be less
than:
– the ignition temperature of the
medium and
– the ignition temperature of the
atmosphere surrounding the
device and
– less than or equal to 80 °C
It is the responsibility of the operator to ensure that these requirements are met concurrently
The minimum ambient tempera-
ture for a device with these limit
switch contacts must be higher
than or equal to - 20 °C.
n Labeling of the mechanical compo-
nent of the flow meter/monitor:
Internal: II 2 G IIB TX
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Categorization of the mechanical component of the
flow monitor
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External: II 2 GD IIC TX
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Categorization of the mechanical component of the
flow monitor
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3.1.5 List of media
media used ignition temp. explosion limit
[%]
lower upper
Argon Inert gas
Cargon gaseous mixture
Argon+CO
2
CO
2
Inert gas
CO2liquid
Diesel 255 (ASTME659-78) 0,6 6,5
Biodiesel SME Soya seed oil
methyl ester
285 (ASTME659-78)
Biodiesel RME Rape seed oil
methyl ester
283 (ASTME659-78)
EDC (1,2-Dichlorethane) 440 6,2 16
Natural gas 575 - 640 4 17
Ethanol 400 3,1
City gas 560
Gaseous mixture 90 %
Argon + 10 %
CO
2
Gaseous mixture 96 %
Argon + 4 % O
2
Helium none none none
air
Methane 595 4,4 16,5
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > List of media
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Methanol 455 6,1 44
N
2
none none none
N2O none none none
NaOH Natrium-hydroxide-
NaOH ("caustic
soda")
none none none
NaOH 50% none none none
Caustic soda
NaOH 25%
none none none
NH
3
anhydrous
ammonia
630 15 28
n-Heptan
(highly purified)
215 1 6,7
O
2
none none none
Oil
organic Salt
solution density
1,35 kg/l 20 °C
Peroxide none none none
RAF2 raffinate 2 385 1,6 10
Spirits of
Ammonia
(25%)
630 15 28
SO
2
Sulphur dioxide none none none
Solvana 2000
(Universal
cleaning agent)
236 0,4 7
Petroleum ether >200 0,6 7
Water none none none
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > List of media
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Water / Nitritesolution
Hydrogenperoxyde 50%
(ultra pure)
none none none
Hydrogenperoxyde 50
weight.-%, dissolved in Water
none none none
Propane 470 2,2 9,5
n-Butane 365 1,4 8,5
3.1.6 Applicable documents
Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Applicable documents
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Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Applicable documents
19.04.2017
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Areas of employment
Mechanical component (flow meter without limit switch contacts and electrical accessories) > Applicable documents
19.04.2017
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3.2 Electrical component of the device
(limiting contacts)
The electrical limiting contacts were
subjected to design examination: PTB
03 ATEX 2154 X
The electrical limiting contacts may
only be employed in combination with
DWM/A-L type devices, in areas in
which an explosive atmosphere, composed of a gas/air- or dust/air-mixture,
may occasionally occur. The limiting
contacts of the device may therefore
be suitably located in explosion hazard
zone 1, zone 2, zone 21, or zone 22.
Dust accumulations are not permitted
on the limiting contacts and must be
excluded by the operator.
3.2.1
Categorization of the
electrical component of the flow
monitor (limit switch
contacts)
n Device group: II
n Device category: 2
n Atmosphere: Gas (G), Dust (D)
n Gas group: IIC
n Ignition protection class (Gas): mb
(Encapsulation, application in zone
1 and 2)
n Ignition protection category (Dust):
td A21 (in accordance with
process A for zone 21), IP67
n Temperature class (Gas): T5, T6
n Maximum permissible surface tem-
perature (Dust): T 80 °C, T 100 °C
3.2.2 Applicable documents
The electrical limiting contacts were
subjected to a design examination
PTB 03 ATEX 2154 X
The following documents must be
observed:
Manufacturer's declaration for the
employment of explosion-proof switch
units within a safety concept
n Design examination certificate with
attachments
n First Amendment to the design
examination certificate
n Third Amendments to the design
examination certificate
n Fourth Amendment to the design
examination certificate
n Conformity declaration (Meister
Strömungstechnik GmbH)
n Operating Instructions for the
switch units
Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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Areas of employment
Electrical component of the device (limiting contacts) > Applicable documents
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4 Operating data
Operating data for employment in
explosion-hazard zones.
4.1
Operating data for
the mechanical
component of the
device
The maximum operating pressure is
specified in Chapter 10.7 of the Operating Instructions for "DWM/A-L
Module BASICS".
The maximum media and ambient temperatures for the mechanical component depends on various factors. It is
the responsibility of the operator to
specify the maximum temperatures
within the framework set by the guidelines in Chapter
Ä
Chapter 3.1.4 “Cat-
egorization of the mechanical component of the flow monitor” on page 16.
4.2 Switch contact operating data
Operating data for the explosion-proof
switch unit with design examination
certificate(PTB 03 ATEX 2154 X).
The following limit values must not be
exceeded, not even for brief periods:
Normally Open Contact (NOC), SEME (T6)
Max operating
voltage
250 V
Max switch current
2 A
Max switching
capacity
60 VA
Max ambient
temp for switch
contact
75 °C
Normally Open Contact (NOC), SEME (T5)
Max operating
voltage
250 V
Max switch current
2 A
Max switching
capacity
60 VA
Max ambient
temp for switch
contact
90 °C
Operating data
Switch contact operating data
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Change-Over Contact, SEM-A (T6)
Max operating
voltage
250 V
Max switch current
1 A
Max switching
capacity
30 VA
Minimum load 3 VA
Max ambient
temp for switch
contact
75 °C
Change-Over Contact, SEM-A (T5)
Max operating
voltage
250 V
Max switching
current
1 A
Max switch
capacity
30 VA
Minimum load 3 VA
Max ambient
temp for switch
contact
90 °C
Operating data
Switch contact operating data
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5 Transport, packaging and storage
Transport, packaging and storage in
non-explosion-hazard zones are
described in Chapter 4, "DWM/A-L
Module BASICS".
In explosion-hazard zones, in addition
to the requirements described in the
above reference, all valid provisions for
safety, accident prevention and environmental protection must be complied
with.
Packaging procedures (wrapping/
unwrapping) may only be conducted
outside the explosion-hazard zone.
DANGER!
Danger to life if packaging procedures are conducted in explosion-hazard zones.
n Packaging procedures may only
be conducted outside the explosion-hazard zone.
Transport, packaging and storage
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6 Installation and initial startup
Installation and initial startup in nonexplosion-hazard zones are described
in Chapter 5, "DWM/A-L Module
BASICS". In addition, for installation
and initial startup in explosion-hazard
zones, the following sections must be
observed:
6.1
Safety
All relevant safety-, accident prevention- and environmental protection regulations must be followed for employment in an explosion hazard zone.
6.2 Tools
Tools, which may cause sparks, are
not to be employed. These tools may
only be used when there is no potentially explosive atmosphere present.
The use of steel tools, of any kind, is
prohibited in hazard zone 1, if there is
risk of explosion due to substances in
explosion hazard group IIC (in accordance with IEC/TR3 60079-20), (for
example, acetylene, hydrogen).
6.3 Protection of the
flow monitor
The flow monitor must be installed in
such a way as to preclude damage by
outside force.
The facility operator is responsible for
the installation of an appropriate
impact protection shield.
6.4 Electrical connection
Electrical connection is accomplished
through the connection cable leading
from the switch housing. All safety
advisories contained in the Operating
Instructions for "DWM/A-L Module
BASICS", Chapter 5, must be
observed. Additionally, for operation in
explosion-hazard zones, all valid provisions for safety, accident prevention
and environmental protection must be
complied with.
6.5 Grounding the
device
When installing the device in a pipe
system, ensure that the device is
grounded to the pipe system to avoid a
dangerous electrical potential difference.
6.6 Contact protection
measures
Recommendations for contact protection measures, when the device is
employed in a non-explosion-hazard
zone, are described in chapter 5.9
"Contact protection measures" of the
Operating Instructions for "DWM/A-L
Module BASICS". When the device is
employed in an explosion-hazard zone,
only those contact protection measures
Installation and initial startup
Contact protection measures
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may be taken, which are consistent
with all valid safety and accident prevention measures for explosion-hazard
zones and the specifications contained
in these Operating Instructions.
Installation and initial startup
Contact protection measures
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7 Operation
Operation is described in Chapter 6,
"DWM/A-L Module BASICS". All
safety- and hazard warnings contained
in Chapter 6, "DWM/A-L Module
BASICS", must be followed. For operation in explosion-hazard zones, all valid
provisions for safety, accident prevention and environmental protection must
be complied with.
Operation
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8 Troubleshooting
The procedures in case of malfunction
are described in Chapter 7, "DWM/A-L
Module BASICS". All safety- and
hazard warnings, contained in Chapter
7, "DWM/A-L Module BASICS", must
be followed. Additionally, for operation
in explosion-hazard zones, all valid
provisions for safety, accident prevention and environmental protection must
be complied with.
Troubleshooting
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9 Maintenance
Maintenance procedures are described
in Chapter 8, "DWM/A-L Module
BASICS". All safety- and hazard warnings, contained in Chapter 8, "DWM/AL Module BASICS", must be followed.
For operation in explosion-hazard
zones, all valid provisions for safety,
accident prevention and environmental
protection must be complied with.
Maintenance procedures may only be
performed outside the explosionhazard zone.
DANGER!
Danger to life if maintenance
procedures are performed in the
explosion-hazard zone
– Maintenance procedures may
only be performed outside the
explosion-hazard zone
9.1 Return Materials
9.1.1
Return Materials
Authorization
For products being returned, regardless of the reason, the currently valid
provisions of the returns policy set by
MEISTER will apply. Return shipments
which do not comply with the returns
policy may be refused by MEISTER at
the expense of the consignor.
Maintenance
Return Materials > Return Materials Authorization
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10 Dissambly and disposal
Disassembly and disposal procedures
are described in Chapter 9, "DWM/A-L
Module BASICS". All safety- and
hazard warnings, contained in Chapter
9, "DWM/A-L Module BASICS", must
be followed. For operation in explosion-hazard zones, all valid provisions
for safety, accident prevention and
environmental protection must be complied with. Disassembly of the device
may only be performed outside the
explosion-hazard zone.
DANGER!
Danger to life if disassembly
procedures are performed in the
explosion- hazard zone
– Disassembly may only be per-
formed outside the explosion
hazard zone
–
Disassembly in an explosion
hazard zone may only be performed if there is no risk from
an explosive atmosphere
Dissambly and disposal
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11 Technical data
11.1
Dimension sheet
Fig. 2: Type DWM/A-L1,5 through DWM/A-L18
Technical data
Dimension sheet
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Fig. 3: Type DWM/A-L18 through DWM/A-L50 (G¾")
Technical data
Dimension sheet
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Fig. 4: DWM/A-L50 through DWM/A-L100 (G1")
Technical data
Dimension sheet
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11.2 General specifications
Type Overall dimensions (mm)
G * DN SW L1 L2 T
DWM/AL1,5
1/4 8 27 117 131 10
3/8 10 27 117 131 15
1/2 15 27 117 131 14
DWM/A-L3 1/4 8 27 117 131 10
3/8 10 27 117 131 15
1/2 15 27 117 131 14
DWM/A-L8 1/4 8 27 117 131 10
3/8 10 27 117 131 15
1/2 15 27 117 131 14
DWM/A-L12 1/4 8 27 117 131 10
3/8 10 27 117 131 15
1/2 15 27 117 131 14
DWM/A-L18 1/2 15 27 132 146 14
3/4 20 32 132 174 15
DWM/A-L50 3/4 20 34 130 152 15
1 25 40 156 156 17
DWM/AL100
1 25 40 156 156 17
Technical data
General specifications
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Type Overall dimensions (mm)
G * D1 D2 A1 A2 A3 A4 weight
(g) **
DWM/AL1,5
1/4 40 40 47 33,5 65,5 ca. 52 800
3/8 40 40 47 33,5 65,5 ca. 52 800
1/2 40 40 47 33,5 65,5 ca. 52 800
DWM/A-L3 1/4 40 40 47 33,5 65,5 ca. 52 800
3/8 40 40 47 33,5 65,5 ca. 52 800
1/2 40 40 47 33,5 65,5 ca. 52 800
DWM/A-L8 1/4 40 40 47 33,5 65,5 ca. 52 800
3/8 40 40 47 33,5 65,5 ca. 52 800
1/2 40 40 47 33,5 65,5 ca. 52 800
DWM/AL12
1/4 40 40 47 33,5 65,5 ca. 52 800
3/8 40 40 47 33,5 65,5 ca. 52 800
1/2 40 40 47 33,5 65,5 ca. 52 800
DWM/AL18
1/2 40 40 47 33,5 65,5 ca. 52 800
3/4 40 40 47 33,5 65,5 ca. 52 960
DWM/AL50
3/4 40 40 57 - - ca. 62 1450
1 40 40 57 - - ca. 62 1450
DWM/AL100
1 40 40 57 - - ca. 62 1450
* NPT thread on request
**Sealed-in cable weight, 2m approx. 80g
Technical data
General specifications
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11.3 Replacement parts
The following replacement parts drawing provides an example of the configuration
of a DWM/A-L ATEX flow monitor The actual configuration may vary depending on
the model.
Fig. 5: Type DWM/A-L1,5 through DWM/A-L18
Technical data
Replacement parts
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Item Qty Description
1 1 Process connection (inlet)
2 2 O-ring (seal)
3 1 Device body
4 1 Pin (outlet) slot nozzle
5 1 Slot nozzle
6 1 Float with magnets
7 1 Process connection (outlet)
8 2 Guide rail
9 4 Fixing screws (guide rail)
10 1 Switch contact ATEX
11 2 Washer
12 2 Set screw, switch contact
13 1 Display, mechanical
Technical data
Replacement parts
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Fig. 6: Type DWM/A-L18 through DWM/A-L50 (G¾")
Item Qty Description
1 1 Process connection (inlet)
2 2 O-ring (seal)
3 2 Centering disc
4 1 Device body
5 1 Pin (outlet) slot nozzle
6 1 Slot nozzle
Technical data
Replacement parts
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Item Qty Description
7 1 Float with magnets
8 1 Process connection (outlet)
9 2 Guide rail
10 4 Fixing screw (guide rail)
11 1 Switch contact ATEX
12 2 Washer
13 2 Set screw, switch contact
14 1 Display, mechanical
Technical data
Replacement parts
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Fig. 7: Type DWM/A-L50 through DWM/A-L100 (G1")
Item Qty Description
1 1 Threaded ring (inlet)
2 1 Centering disc
3 1 Device body
4 1 Pin (outlet) slot nozzle
5 1 Slot nozzle
6 1 Float with magnets
Technical data
Replacement parts
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Item Qty Description
7 1 Threaded ring (outlet)
8 2 Guide rail
9 4 Fixing screw (guide rail)
10 1 Switch contact ATEX
11 2 Washer
12 2 Set screw, switch contact
13 1 Display, mechanical
Technical data
Replacement parts
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12 Appendix
The required tools are specified in
Chapter 11.3 "Tools" of the Operating
Instructions for "DWM/A-L Module
BASICS".
In explosion-hazard zones, tools which
may cause sparks, are not to be
employed. These tools may only be
employed when there is no potentially
explosive atmosphere present.
The use of steel tools, of any kind, is
prohibited in hazard zone 1, if there is
a risk of explosion due to substances
in explosion hazard group IIC (in
accordance with IEC/TR3 60079-20),
(for example, acetylene, hydrogen).
Appendix
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13 Index
A
Applicable Documents .........24
Atmosphere ................24
C
Categorization ...............24
mechanical component ......16
Contact ....................6
Contact protection measures .....39
Copyright ...................3
Correct use ..................8
Customer service .............6
D
Device
electrical component ........24
exterior .................14
interior ..................14
Device category ..............24
Device group ................24
Dimension sheet .............45
Disassembly ................44
disposal ...................44
E
Electrical connection ..........39
employment .................8
Environmental protection regula-
tions ......................39
F
Flow monitor
protection ...............39
G
General
safety ...................7
Grounding ..................39
I
Ignition protection category ......24
Initial start-up ...............39
Installation .................39
L
Limitation of liability ............3
Limiting contacts .............24
List of media ................19
M
Maintenance ................43
O
Operating data
mechanical component ......36
switch contact ............36
Operation ..................41
P
Packaging ..................38
Personnel ..................12
Precautions
explosions ...............11
general .................10
Protective systems ............13
R
Replacement parts ............50
Return Materials Authorization ....43
S
Safety equipment .............13
Safety information
mechanical component ......15
Safety regulations ............39
Service .....................6
Storage ...................38
Index
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Symbols used
in the instructions ...........7
T
Technical data
general specifications .......48
Temperature class ............24
Temperature class internal: TX,
external: TX ................18
Tools ..................39, 56
Transport ..................38
Troubleshooting ..............42
W
Warranty and guarantee provisions
. 6
Index
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