KROHNE BW25Ex User Manual
Supplementary instructions
Supplementary instructions
BW25
BW25
BW25BW25
Ex supplementary instructions
Equipment category II 1/2 G
Supplementary instructions Supplementary instructions
© KROHNE 03/2010 - 4000862901 MA BW25-Ex-II1/2G-AD R01 en
CONTENTS
BW25
1 Safety instructions 3
1.1 General notes ................................................................................................................... 3
1.2 EC conformity ................................................................................................................... 3
1.3 Security information......................................................................................................... 3
2 Device description 4
2.1 Device version................................................................................................................... 4
2.2 Description code............................................................................................................... 5
2.3 Nameplate ........................................................................................................................ 6
2.4 Flammable products ........................................................................................................ 7
2.5 Device category ................................................................................................................ 7
2.6 Types of protection ........................................................................................................... 7
2.7 Ambient temperature / temperature classes.................................................................. 8
2.8 Electrical data................................................................................................................. 11
3 Installation 12
3.1 Installation...................................................................................................................... 12
3.2 Installation condititions ..................................................................................................12
3.3 Tank socket..................................................................................................................... 12
3.4 Auxiliary connections on the reference vessel .............................................................. 12
4 Electrical connections 13
4.1 General notes ................................................................................................................. 13
4.2 Electrical connection BW25/.././M9./../…/...................................................................... 13
4.3 Electrical connection BW25/.././M10.............................................................................. 14
4.4 Earthing and equipotential bonding ............................................................................... 16
5 Operation 17
5.1 Start-up........................................................................................................................... 17
5.2 Operation ........................................................................................................................ 17
5.2.1 Version BW25/.././M9./../.../ .................................................................................................. 17
5.2.2 Version BW25/.././M10 .......................................................................................................... 17
6 Service 18
6.1 Maintenance ................................................................................................................... 18
6.2 Dismantling .................................................................................................................... 20
7 Notes 21
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1.1 General notes
These additional instructions apply to explosion-protected versions of level meters with
electrical built-ins and the marking II 1/2 G. They complete the installation and operation
instructions for the non-explosion protected versions.
The information given in these instructions contains only the data relevant to category 1/2
explosion protection. The technical details given in the installation and operation instructions for
the non-explosion protected versions apply unchanged unless excluded or superseded by these
instructions.
1.2 EC conformity
Under his sole responsibility, the manufacturer hereby declares conformity with the protection
goals of Directive 94/9/EC for use in hazardous areas.
The EC Type Examination Certificate of the Physikalisch Technische Bundesanstalt
(PTB) forms the basis of the EC Declaration of Conformity:
SAFETY INSTRUCTIONS 1
If required the EC Type Test Certificate can be downloaded under www.krohne.com.
1.3 Security information
Assembly, installation, start-up and maintenance may only be performed by personnel trained in
explosion protection!
CAUTION!
The operator respectively his agent is responsible to follow further standards, directives or laws
if required due to operating conditions or place of installation. This applies particularly for the
use of easy detachable process connections such as SMS or Clamp when measuring flammable
mediums.
PTB 05 ATEX 1053 X
PTB 05 ATEX 1053 X
PTB 05 ATEX 1053 XPTB 05 ATEX 1053 X
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2 DEVICE DESCRIPTION
2.1 Device version
1 BW25 with indicator M9
2 BW25 with indicator M10
1 BW25/M9
• Local indicator without auxiliary power
• Max. 2 limit switches, type NAMUR, NAMUR safety-oriented
• 2-wire current output 4…20 mA, HART
®
communication
BW25
2 BW25/M10
• Ex d flameproof enclosure
• 2 digital adjustable limit switches, 2-wire open collector or type NAMUR
®
• 2-wire current output 4…20 mA, HART
communication
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2.2 Description code
The description code* consists of the following elements:
1 Materials / versions
RR - Stainless Steel
Ti - rust-proof steel (device flange), titanium (displacement rod)
2 Version with bypass chamber
B - with bypass chamber
3 Series of indicators
M9 - Indicator M9 standard indicator
M9S - Indicator with knock-resistant sight glass
M9R - Indicator in Stainless Steel housing
M9T - Stainless steel indicator with knock-resistant sight glass
M10 - Indicator or signal converter M10
DEVICE DESCRIPTION 2
4 High temperature version
HT - Version with HT extension
5 Electrical signal output
ESK - Electronic transmitter
6 Limit switch
K1 - One limit switch
K2 - Two limit switches
* positions which are not needed are omitted (no blank positions)
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2 DEVICE DESCRIPTION
2.3 Nameplate
INFORMATION!
Before installing the device, make sure that the information on the nameplate corresponds to
the ordering data.
BW25
Figure 2-1: Nameplates on the indicator
1 Device type
2 Manufacturer
3 Notified ATEX body
4 Sizing data: temperature & pressure rating
5 PED data
6 Ex-data (respectively II 1/2G c for M9 without electrical installations)
7 Electrical connection data (are omitted for M9 without electrical installations)
8 Note manual
9 KROHNE website
Additional markings on the indicator
• SO - sales order / item
• KO - KROHNE order
• Vx - product configurator code
• AC - article code
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2.4 Flammable products
Atmospheric conditions, flammable fluids
An explosive atmosphere is defined as a mixture of air and flammable gases, vapours, mists or
dusts under atmospheric conditions with the values
= -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. If the
application conditions do not fall within the above range, the risk of ignition in each individual
situation must be analysed on the basis of the known parameters (e.g. pressure, temperature,
process product, meter material).
2.5 Device category
The liquid level indicators are designed for Category 1/2 as per RL 94/9 EC and according to EN
60079-14 for use in Zone 0. The converters are designed for Category 2 as per RL 94/9 EC for use
in Zone 1.
= 0.8...1.1 bar.
atm
DEVICE DESCRIPTION 2
2.6 Types of protection
BW25/.././M9./.. converters without electric components are supplied as type of protection
constructional safety "c".
Electrical circuits for M9. converters with limit switches or electronic signal outputs are supplied
as intrinsically safe, category "ia" or "ib" as per EN 60079-11.
The M10 converter is supplied as protection type "explosion proof".
The marking is:
Version BW25/.././M9./.. c
Version BW25/.././M9./../.../.. Ex ia IIC T6
Version BW25/.././M10 Ex d IIC T6
The marking contains the following information:
cccc constructional safety "c"
ia
ia Intrinsically safe, level of protection "ia"
iaia
dddd flameproof enclosure
IIC
IIC Suitable for gas groups IIC, IIB and IIA
IICIIC
T6
T6 Suitable for temperature classes T6 ... T1
T6T6
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2 DEVICE DESCRIPTION
2.7 Ambient temperature / temperature classes
Due to the influence of the product temperature, level meter with built-in electrical equipment
(electric variants) are not assigned to any fixed temperature class. The temperature class of
these devices is rather a function of the product temperature and ambient temperature that is
present and the specific device version. Please see the following tables for the assignments.
The tables take into account the following parameters:
• Installed equipment
• Maximum values P
• Ambient temperature T
• Product temperature T
• Standard or high temperature version (HT)
• Heat resistance of the connecting cable
When there is more than type of built-in equipment, the data of the most unfavourable
equipment should be used.
for K1, K2, ESK
i
amb.
m
BW25
INFORMATION!
The maximum permissible product temperatures listed in the tables are valid under
the following conditions:
•
The measuring device is installed and operated in accordance with the installation
instructions.
•
It must be ensured that the flowmeter is not heated by the effects of additional
heat radiation (sunshine, neighbouring system components) and
thus operated above the permissible ambient temperature range.
•
Insulation must be limited to the piping.
Unobstructed ventilation of the indicator part must be ensured.
To do this, the variant with a projecting indicator (HT version) is preferable.
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