Aplisens WW-11ALW Benutzerhandbuch - Seite 12
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8.3. Electrical connection of display in safe areas
Figure 5. Connection diagram of WW-11ALW display in the safe zones.
a) Diagram of connection with transmitter;
b) diagram of connection with transmitter with Hart communication.
In order to communicate with the intelligent transmitter (via HART protocol), before connect-
ing the local communicator or converter, it is necessary to check whether the Ro resistance
seen from terminals (2) and (3) of the display towards the power source is in the range
240≤Ro≤1100 Ω.
8.4. Electrical connection of display in hazardous areas
In order obtain correct cooperation of the display with the rest of the system and assure in-
trinsic safety conditions it is important to correctly connect the display with particular empha-
sis on the requirements for the installation of intrinsically safe systems (EN 60079-25,
EN 60079-14) and meeting the input/output parameters.
Displays can be supplied from power supply and measurement equipment with relevant in-
trinsic safety certificates, parameters of which for outputs to potentially explosive areas
should not exceed the limits for feeding parameters of displays (permissible parameters of
feeding the transmitters in hazardous areas see point 6.2).
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Revision 01.B.003/2020.09