DW 18 SERIES |
Supplementary instructions |
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Mechanical Flow Controller
Supplementary Instructions for ATEX applications
© KROHNE 11/2011 - 4001528201 - AD ATEX DW181-184 R01 en
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CONTENTS |
DW 18 SERIES |
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1 General safety information |
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1.1 |
Scope ................................................................................................................................ |
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1.2 |
Device description ............................................................................................................ |
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1.3 |
Standards and approvals.................................................................................................. |
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1.4 |
Device categories ............................................................................................................. |
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1.4.1 Ex c-approved devices ............................................................................................................ |
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1.4.2 Ex ia-approved devices ........................................................................................................... |
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1.4.3 Ex d- / Ex tb-approved devices ............................................................................................... |
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1.4.4 Definitions of device categories.............................................................................................. |
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1.5 |
Equipment protection levels (EPL)................................................................................... |
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1.5.1 Ex ia-approved devices ........................................................................................................... |
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1.5.2 Ex d- / Ex tb-approved devices ............................................................................................... |
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1.5.3 Definitions of equipment protection levels ............................................................................ |
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1.6 |
Nameplates ...................................................................................................................... |
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1.6.1 ATEX nameplates .................................................................................................................... |
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1.6.2 Other labels............................................................................................................................. |
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2 Installation |
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2.1 |
Special conditions for safe use ........................................................................................ |
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2.2 |
Operating conditions: ambient and process temperature ............................................ |
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3 Electrical connections |
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3.1 |
General notes ................................................................................................................. |
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3.2 |
Ex c equipment ............................................................................................................... |
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3.3 |
Ex ia equipment .............................................................................................................. |
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3.3.1 How to connect the electrical cables ................................................................................... |
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3.3.2 Maximum intrinsically-safe values for the electrical circuit ............................................... |
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3.3.3 Electrical schematics............................................................................................................ |
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3.4 |
Ex d / Ex tb equipment.................................................................................................... |
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3.4.1 General notes........................................................................................................................ |
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3.4.2 How to connect the electrical cables ................................................................................... |
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3.4.3 Maximum switching capacity values for the electrical circuit............................................. |
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3.4.4 Electrical schematics............................................................................................................ |
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4 Start-up |
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5 Service |
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5.1 |
Periodic maintenance..................................................................................................... |
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5.2 |
Returning the device to the manufacturer..................................................................... |
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5.2.1 General information.............................................................................................................. |
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5.2.2 Form (for copying) to accompany a returned device............................................................ |
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6 Notes |
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www.krohne.com |
11/2011 - 4001528201 - AD ATEX DW181-184 R01 en |
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GENERAL SAFETY INFORMATION 1 |
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DW 18 SERIES |
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1.1 Scope
These instructions are applicable only to devices that have one of the two application options for use in hazardous areas (intrinsically-safe and explosion-proof devices). For all other data, use the Quick Start and Handbook for the DW 18 series flow switch. If you do not have these documents, please contact the nearest sales office or download them from the website www.krohne.com.
WARNING!
Installation, commissioning and maintenance may only be carried out by "Personnel trained in explosion protection".
INFORMATION!
The information in this ATEX supplement only contains the data applicable to explosion protection. The technical data in the installation and operating manual for the non-Ex version shall be valid in its current version, provided that they are not rendered invalid or are replaced by this ATEX supplement.
1.2 Device description
DW 181 - 184 flow switches are mechanical devices that use a hinged, spring-loaded metal disc to measure the flow rate of homogenous, clean liquids. Adjustable switches in the device operate an alarm when you have the correct flow rate or velocity.
Several variants (DW181, DW182 etc.) are available for a wide range of pipe diameters. Each variant has display and application options.
The flow switch is approved for use in potentially explosive atmospheres when equipped with the appropriate options.
1.3 Standards and approvals
DANGER!
In compliance with European Directive 94/9/EC (ATEX 100a), the ATEX version of the device described in these Supplementary Instructions conforms to European Standards EN 60079- 0:2009, EN 60079-1:2007, EN 60079-11:2007, prEN 60079-11:2011, EN 60079-31:2009,
EN 13463-1:2009 and EN 13463-5:2004. The Ex ia, Ex d and Ex c versions are certified for use in hazardous areas by INERIS under INERIS 03ATEX0045 X.
WARNING!
Carefully read the ATEX approval certificate. Obey the boundary conditions.
The certificate is given on the CD-ROM supplied with the device. You can also download the certificate from our internet site.
11/2011 - 4001528201 - AD ATEX DW181-184 R01 en |
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1 GENERAL SAFETY INFORMATION |
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DW 18 SERIES |
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1.4 Device categories
1.4.1 Ex c-approved devices
The Ex c-approved device does not have a switch option. It only has an indicator.
The Ex c-approved device is suitable for use in potentially explosive atmospheres of all flammable substances in Apparatus Group IIC. It is certified for applications requiring Category 1 G (gases, vapours or mists) or 1 D (dust) equipment when fitted with the appropriate options.
1.4.2 Ex ia-approved devices
Ex ia-approved devices have these switch options:
•K1 (1 × N/C (normally closed) switch or 1 × N/O (normally open) switch)
•K2 (2 × N/C switches or 2 × N/O switches)
•K2 (1 × N/C and 1 × N/0 switches or 1 × N/O and 1 × N/C switches)
•K1 changeover (1 × 3-wire SPDT switch)
•K2 changeover (2 × 3-wire SPDT switches)
The Ex ia-approved device is suitable for use in potentially explosive atmospheres of all flammable substances in Apparatus Groups IIC and IIIC. It is certified for applications requiring Category 1 G (gases, vapours or mists), or 1 D (dust) equipment when fitted with the appropriate options.
INFORMATION!
The mechanical part of the assembly is Ex c-approved.
1.4.3 Ex d- / Ex tb-approved devices
Ex d- / Ex tb-approved devices have these switch options:
•K1 (1 × N/C switch)
•K1 (1 × N/O switch)
•KV1 (1 × N/O switch with relay)
The Ex d- and Ex tb-approved devices are suitable for use in potentially explosive atmospheres of all flammable substances in Apparatus Groups IIC and IIIC. It is certified for applications requiring Category 1/2 G (gases, vapours or mists) or 1/2 D (dust) equipment when fitted with the appropriate options.
INFORMATION!
The mechanical part of the assembly is Ex c-approved.
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www.krohne.com |
11/2011 - 4001528201 - AD ATEX DW181-184 R01 en |
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GENERAL SAFETY INFORMATION 1 |
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DW 18 SERIES |
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1.4.4 Definitions of device categories
Category 1
The device is installed in hazardous areas requiring Category 1 G or 1 D equipment.
Category 1/2
The switch housing is installed in hazardous areas requiring Category 2 G or 2 D equipment. The measuring tube is installed in hazardous areas requiring Category 1 G or 1 D equipment.
1.5 Equipment protection levels (EPL)
1.5.1 Ex ia-approved devices
The Ex ia-approved device is certified for applications for which an EPL of Ga or Da is necessary.
1.5.2 Ex d- / Ex tb-approved devices
The Ex d-approved device is suitable is certified for applications for which an EPL of Gb or Db is necessary.
1.5.3 Definitions of equipment protection levels
EPL Ga or Da
The device is installed in hazardous areas that must have equipment with a very high level of protection. The device is not a source of ignition in usual conditions of operation or when possible or unusual faults occur.
EPL Gb or Db
The device is installed in hazardous areas that must have equipment with a high level of protection. The device is not a source of ignition in usual conditions of operation or when possible faults occur. It is possible that this does not include frequent faults.
1.6 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.
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1.6.1 ATEX nameplates |
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Figure 1-1: Ex c nameplate
1ATEX certification agency code
2Year made
3Gas group, equipment approval category (explosive atmosphere - gas or dust), types of device protection, temperature classes (T6...T3), maximum surface temperature and degree of ingress protection (if fitted with the appropriate cable glands)
Figure 1-2: Ex ia nameplate
1ATEX certification agency code
2Year made
3Gas group, equipment approval category (explosive atmosphere - gas), types of device protection including apparatus groups, temperature classes (T6...T3) and equipment protection level
4Gas group, equipment category (explosive atmosphere - dust), types of device protection including apparatus groups, maximum surface temperature, equipment protection level and degree of ingress protection (if fitted with the appropriate cable glands)
5Mechanical parts only: Gas group, equipment approval category (explosive atmosphere - gas or dust), types of device protection, temperature classes (T6...T3), maximum surface temperature and degree of ingress protection (if fitted with the appropriate cable glands)
6Maximum intrinsically-safe values for the electrical circuit
7Electrical schematic (type of switch, number of switches and switch position)
INFORMATION!
Cable entry data for Ex i-approved devices is given on the standard device nameplate.
Cable entry options: PG13.5, M20×1.5 or ½ NPT
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11/2011 - 4001528201 - AD ATEX DW181-184 R01 en |
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