KROHNE DW 181-182-183-184 ATEX EN - Manual (Page 5)

GENERAL SAFETY INFORMATION
1
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DW 18 SERIES
www.krohne.com 11/2011 - 4001528201 - AD ATEX DW181-184 R01 en
1.4.4 Definitions of device categories
Category 1 Category 1 Category 1 Category 1
The device is installed in hazardous areas requiring Category 1 G or 1 D equipment.
Category 1/2 Category 1/2 Category 1/2 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 EPL Ga or Da EPL Ga or Da 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 EPL Gb or Db EPL Gb or Db 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.