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

4 Installation and operating instructions DW 181 - 184
General advice on safety
This manual gives a complete set of instructions for the installation, operation and
maintenance of the standard and ATEX versions of the DW 18 flow switches.
DW 18 flow switches must be used with liquids that do not have any gas pockets.
Special regulations are applicable to the use of equipment in hazardous locations,
and these are described in this booklet. Data is supplied on explosion protection.
Assembly, installation, commissioning and maintenance of equipment in
hazardous areas must only be carried out by qualified personnel with
relevant explosion protection training.
Standards / Approvals
DW 18 flow switches meet the protection requirements of Directive
89/336/EEC in conjunction with EN 50081-1 and EN 50082-2, and Directives
73/23/EEC and 93/68/EEC in conjunction with EN 61010-1, and also bear the
CE symbol.
These instruments, when ordered with the appropriate options, are certified for
use in hazardous locations by the INERIS certification agency under INERIS
03ATEX0045X. They respect the Health & Safety regulations in force by
conforming to EN 50014 (+ A1 & 2), EN 50018, EN 50020, EN50284, EN
50281-1-1 (+ A1) and EN 13463-1.
Ex safety instructions
The DW 18 flow switch series are suitable for monitoring flow of liquid in pipes in hazardous
areas. They may be approved for use in explosive atmospheres of all flammable substances in
Gas Group IIC in Zone 1 and applications requiring Category 2 equipment for EEx d applications
and Gas Group IIC in Zone 0 requiring Category 1 equipment with an intrinsically-safe power
supply for
EEx ia applications.
Ex Equipment Category Definitions
Category 1 G/D – instruments: for intrinsically-safe applications
The signal converter for the limit switch options and the measuring components are located in
hazardous areas requiring instruments qualified as being category 1. The G/D rating states that
the instrument is qualified for gas and dust environments. EEx ia-approved devices must be used
with a certified intrinsically-safe power supply.
Category 2 G/D – instruments: for applications using the EEx d-rated explosion-proof box
The signal converter for the limit switch options and the measuring components are located in
hazardous areas requiring instruments qualified as being category 2. The G/D rating states that
the instrument is qualified for gas and dust environments.
Handling
The device weighs between approx. 2 kg (4.5 lb) and 14 kg (30 lb). Carry using both hands to lift
the device carefully by the tube. If necessary, use lifting gear.
Avoid hard blows, jolts, impacts, etc. when handling the DW 18.