KROHNE OPTISWIRL 4070 ATEX II2G EN - Manual (Page 15)

ELECTRICAL CONNECTIONS
4
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OPTISWIRL 4070
www.krohne.com 04/2013 - 4000077105 MA OPTISWIRL4070 II2G AD R05 en
4.5 Sensor circuits (remote version only)
Observe the following points when connecting the sensor to the converter:
• Use only the supplied connecting cable (max. length 30 m / 98 ft).
• Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
• Connect the connecting cable shield to the equipotential bonding of the hazardous area using
the stress resisting clamp in the wall bracket. Sensor-side, the shield must be carefully
isolated from the earth (Test voltage 500 V
eff
).
• The intrinsically safe pressure transmitter circuit (pressure, terminals 1-5) and the
intrinsically safe piezo / Pt1000 circuit (piezo, terminals 1-3 and Pt1000, terminals 1-2) are to
be galvanically isolated from one another and from the earth along the complete length up to
the connections in the wall bracket.
The separate sensor circuits are designed in type of protection intrinsic safety Ex ia IIC.
AD_OPTISWIRL4070_II2G_R05_en_077105_PRT.book Page 15 Tuesday, April 23, 2013 2:17 PM