General Electrical Connection; Earthing The Transmitter - 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
simple 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)
or shielded cables should be adopted.
When using shielded cables observe faultless grounding of the shield at both
ends.
The cable diameter must be between 6 and 12 mm, with a 6-mm multiway seal.
In case of doubt, always use shielded cables.
The power supply must be regulated - section 6.1
Do not open and wire the transmitter with the power supply connected.
It is advisable to put security devices on :
Power supply: Fuse (300 mA) and an interrupter
Relay: 3A max. fuse and circuit breaker (depending on application).
Do not apply both a dangerous voltage and a very low safety
voltage to the relays.
3.3.1

EARTHING THE TRANSMITTER

The various earth spots in the installation have to be connected together to
eliminate the potential differences that may occur between different earthes.
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 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 and are not supplied by Bürkert.
Stainless steel
or brass
8045
INSTALLATION
2 cross section.
For plastic pipe applications
11
Metallic
devices
Fluid Control Systems