KROHNE DW 181-182-183-184 ATEX EN - Manual (Page 4)

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GENERAL SAFETY INFORMATION
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DW 18 SERIES
www.krohne.com 11/2011 - 4001528201 - AD ATEX DW181-184 R01 en
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.
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.
INFORMATION!
The mechanical part of the assembly is Ex c-approved.