Burkert 8025 Manuel Utilisateur page 21

Installation and electrical wiring
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 12-36 VDC-power supply must be filtered and regulated. The circuit must have an
extra low safety voltage, with a non dangerous energy level.
• Ensure the equipotentiality of the installation (power supply - device - medium):
- 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 com-
mon 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 the-
re 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 device.
Metal pipes
Devices such as
valves, pumps,...
Plastic pipes
(*) If direct earthing is not possible, insert a 100 nF / 50 V condensator between the negative terminal of the
voltage supply and the earth.
Fig. 13 : 8025 in a compact version and 8035, equipotentiality skeleton diagram
Flow transmitter 8025/8035
E-19-
Power supply
Power supply