bürkert 8041 Bedienungsanleitung Seite 69

- 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.
- Ensure the equipotentiality of the installation (power supply - flowmeter - 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 the 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/50 V-condensator
between the negative terminal and the earth.
Special attention has to be paid if the flowmeter 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 pres-
ent, insert metallic piping parts (earthing rings, not supplied) into the plastic pipes
before and after the magmeter and earth them together.
The earthing rings must be in contact with the fluid.
Inside of the housing: Connect the
shielding of the power supply cable to
pin N° 4 of the electronic board termi-
nal strip.
(*)
(*) or metallic parts, inserted inside the pipe.
(**) If direct earthing is impossible, connect a 100 nF/50 V-condensator between the negative terminal of the power supply
and the earth.
8041
INSTALLATION
Shielding of the power supply cable
(*)
Metallic devices (valve, pump,...)
For plastic pipe applications
Shielding of the power supply cable
18-36VDC
Earthing cable originating
from the housing. If the
+
transmitter is fitted with a
-
stainless steel sensor, a
second cable originates
(**)
from the sensor.
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