KROHNE BW 25 Ex II 1-2 G EN - Manual (Page 15)

ELECTRICAL CONNECTIONS
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BW25
www.krohne.com 03/2010 - 4000862901 MA BW25-Ex-II1/2G-AD R01 en
Connecting power and I/O functions Connecting power and I/O functions Connecting power and I/O functions Connecting power and I/O functions
BW25/.././M10 liquid level indicators do not require a separate power supply. The required
supply is provided via the current output.
• Before connecting or disconnecting the electrical connection cables of the device, make sure
that all cables leading to the converter are isolated from the ground of the hazardous area.
This also applies to equipotential bonding conductors (PA).
• All connecting cable conductors and shields that are not securely connected to the
equipotential grounding system of the hazardous area shall be carefully isolated from one
another and from ground (1500Vrms test voltage for non-intrinsically safe cables)
• Connect all shields by the shortest route possible to the press fitted U-clamp (PE) terminal
located in the terminal compartment. If shields are to be grounded at both ends (e.g., for EMC
reasons), adequate equipotential bonding is required between the two shields to avoid
unacceptable equalizing currents.
The converter shall be incorporated into the equipotential bonding system of the hazardous area.
Connect the conductor to the press-fitted U-clamp mounted on the outside of the converter
housing.
The meter can be incorporated into the equipotential bonding system of the hazardous area
using the U-clamp mounted on the flange if present, or suitable conductive connections (seals,
etc.)
Consult the BW25 handbook for terminal assignment.
DANGER!
•
The converter shall be connected to the equipotential bonding conductors via the outer PA
connector
• The wiring for the liquid level indicator's electrical connection shall be fixed.
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