General Electrical Connection - bürkert 8045 Bedienungsanleitung

3.3

GENERAL ELECTRICAL CONNECTION

Use cables with a temperature limit of 80°C minimum.
For normal operating conditions the measuring signal can be transmitted by a
shielded cable of 0.75 mm
The line must not be installed in combination with carrying lines with a higher
voltage or frequency.
If a combined installation cannot be avoided, a minimum space of 30 cm (1 ft)
should be respected.
The cable diameter must be between 6 and 12 mm;
If 2 cables are needed, use the supplied multiway seal and 4-mm diameter cables.
The power supply must be filtered and regulated - section 6.1
Ensure the equipotentiality of the installation (power supply - transmitter - fluid):
- The various earth spots in the installation have to be connected together to
eliminate the potential differences that may occur between different earthes.
- Observe faultless grounding of the shield at both ends of teh cable.
- Earth the negative terminal of the power supply to suppress the common
mode currents. If direct earthing is not possible insert a 100 nF-condensator
between the negative terminal and the earth.
Special attention has to be paid if the transmitter is installed on plastic pipes
because there is no direct earthing possible.
Proper earthing is performed by earthing together the metallic devices such as
pumps or valves, that are as close as possible to the magmeter. If no such devices
are present, insert metallic piping parts (earthing rings, not supplied) into the
plastic pipes before and after the magmeter and earth them together. The earthing
rings shown in the diagram below must be in contact with the fluid.
Inside of the housing: Connect the shielding to the earth.
Take care not to completely untighten the screw. Insert shielding.
Retighten screw
(*)
(*) or metallic parts, not supplied, inserted inside the pipe.
(**) If direct earthing is impossible, connect a 100 nF-condensator between the negative terminal and the
earth.
8045
INSTALLATION
2
cross section.
Shielding
(*)
Metallic devices (valve, pump, etc)
For plastic pipe applications
11
18-36VDC
+
-
(**)