Electrical connections – KROHNE BW 25 Ex II 1-2 G EN User Manual

Page 13

ELECTRICAL CONNECTIONS

BW25

www.krohne.com

03/2010 - 4000862901 MA BW25-Ex-II1/2G-AD R01 en

Electrical connections

4.1 General notes

The insulation for the BW25/.././…/../…/.. liquid level indicator is rated in accordance with VDE
0110-1, in compliance with IEC 60 664-1.

Rated values for insulation:

• Overvoltage category for signal and instrument loops: II
• Pollution degree of the insulation: 2

4.2 Electrical connection BW25/.././M9./../…/

Terminal assignment

The electrical connection for the limit switch or the electronic signal output is made in the
terminal compartment of the indicator housing. Consult the handbook for terminal assignment.
Ensure that the connection conforms to the terminal polarity labelling. When the meter is
equipped with two different limit switches, the switch configuration is shown on the nameplate
and on the terminals to ensure they are assigned correctly.

Connecting cable

Connection cables for the intrinsically safe circuits must be selected to comply with the
applicable installation standard (e.g., EN 60079-14 / VDE 0165). The formation of summation
currents between the various intrinsically safe circuits shall be prevented.

Lay cables so as to ensure that there is sufficient distance between surfaces of the measuring
unit and the connecting cable.

Cable entries / Blanking plugs

The level meter comes standard with a blanking plug and a cable entry. These elements
guarantee protection from foreign bodies and water (protection type) IP65 as per EN 60529.

Consult the "Technical Data" section in the BW25 handbook for the nominal diameter range for
the cable entries.

Proper blanking plugs and seals are to be used for unused cable entries. Ensure that the seals
are tight.

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