Electrical Connection; Recommendations For The Electrical Wiring (All Versions) - bürkert 8025 KONTI-DOS Bedienungsanleitung

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3 INSTALLATION

3.2 ELECTRICAL CONNECTION

3.2.1 Recommendations for the electrical wiring (all versions)

Do not open nor wire while the transmitter is powered.
The electrical installation of the building where the transmitter is
installed must be secured by a switch or a circuit breaker.
It should be installed near the transmitter, be easily accessible and be
clearly identified as the switchgear of the transmitter.
It is recommended to put security devices on:
The power supply: Fuse (300 mA, slow-blow) and an interrupter
Relays: a max. 3-A-fuse and a circuit breaker (depending on the
application).
Do not apply in the same cable both a dangerous voltage and a very
low safety voltage to the relays.
Use cables with an operating limit temperature of at least 80 °C.
For normal operating conditions the measuring signal can be transmitted by a shielded
2
cable of 0,75 mm cross section.
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 should be
respected.
The diameter of a cable passing through a cable gland must be between 6 and 12 mm ;
If 2 cables pass through a single cable gland, first insert the multy-way seal and use
cables with a 4 mm- diameter.
The 13-30 VDC-power supply must be filtered and regulated.
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 the power supply cable.
- Earth the negative terminal of the power supply to suppress the effects of the
common mode currents. If direct earthing is impossible, insert a 100 nF/50 V
condensator between the negative terminal of the power supply and the earth.
Special attention has to be paid if the device 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 transmitter.
8025 / 8035 KONTI-DOS
F-15-