Electrical Connection Recommendations (All Versions) - Burkert 8025 Notice D'utilisation

3 INSTALLATION
3.3 Electrical Connection

3.3.1 Electrical connection recommendations (all versions)

Do not open and wire the device with the power supply connected.
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The electrical installation of the building where the transmitter is
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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 :
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Power supply: Fuse (300 mA - temporised) and an interrupter
Relay: 3A max. fuse and circuit breaker (depending on application).
Do not apply in the same cable both a dangerous voltage and a very
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low safety voltage to the relays.
Use shielded cables with a temperature limit of 80°C minimum.
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For normal operating conditions the measuring signal can be transmitted by a
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shielded cable of 0.75 mm2 cross section.
The line must not be installed in combination with carrying lines with a higher
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voltage or frequency.
If a combined installation cannot be avoided, a minimum space of 30 cm should be
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respected.
The cable diameter must be between 6 and 12 mm;
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If 2 cables are needed, use the supplied multiway seal and 4-mm diameter cables.
The 12-30 VDC power supply must be filtered and regulated.
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Ensure the equipotentiality of the installation (power supply - transmitter - medium):
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- 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 cable shielding.
- 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-capacitor
between the negative terminal 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.
FLOW TRANSMITTER 8025
E-12-