11
8045
ENGLISH
INSTALLATION
3.3 GENERAL ELECTRICAL CONNECTION
l Use cables with a temperature limit of 80°C minimum.
l For normal operating conditions the measuring signal can be transmitted by a
simple cable of 0.75 mm
2
cross section.
l The line must not be installed in combination with carrying lines with a higher
voltage or frequency.
l If a combined installation cannot be avoided, a minimum space of 30 cm (1 ft)
or shielded cables should be adopted.
l When using shielded cables observe faultless grounding of the shield.
l In case of doubt, always use shielded cables.
l The power supply must be regulated - section 6.1
l Do not open and wire the transmitter with the power supply
connected.
l It is advisable to put security devices on :
Power supply: Fuse (eg/ 250mA) and an interrupter
Relay: 3A fuse max. and circuit breaker (depending on application).
3.3.1 EARTHING THE TRANSMITTER
For EMC purposes and in order to ensure accurate measurement, it is
important that the transmitter is connected to the earth correctly as improper
earthing can have an adverse effect on the transmitter and flow measurement.
For correct earthing, the earth lug on the side of the enclosure must be
connected to a good local earthing point via an insulated cable of 2mm
2
and
one of the diagrams below must be followed.
The earthing rings shown in the diagram below must be in contact with
the fluid and are not supplied by Bürkert.
For Metal pipe applications For plastic pipe applications
Stainless
steel Stainless
steel
3.3
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