Electrical Connections; General Notes; Power Supply - Siemens SITRANS F Additional Operating Instructions

ELECTRICAL CONNECTIONS

4

4.1 General notes

Rated values for insulation
• The insulation of the vortex flowmeter SITRANS FX330 . .. - Ex is rated in compliance with
IEC 60 664-1. The following rating parameters are taken into account:
• Overvoltage category for signal and instrument loops: II
• Pollution degree of the insulation: 2
Terminal compartment
The signal circuit is electrically connected in the terminal compartment of the signal converter.
The protection type of the terminal compartment is "nA". Unused entries shall be closed in
compliance with EN 60079-15.
Connecting cables
The connecting cables should be selected according to the applicable installation standards (e.g.
EN 60079-14 / VDE 0165) and the maximum operating temperature.
The connecting cable between the measuring sensor and wall bracket with remote systems is
part of the supply.
• The connecting cables must be fixed and laid so they are sufficiently protected against
damage.
• Lay cables so as to ensure that there is sufficient distance between surfaces of the
measuring unit and the connecting cable.
• Supplied blind plugs / cable entries guarantee protection against foreign objects and water
(protection category) IP66 / 67 according to EN 60529.
• The outer diameter of the connecting cable must be within the sealing range of the cable
entry (6...12 mm / 0.24...0.47").
• Unused cable entries are to be closed in accordance with EN 60079-15 (>IP66 / 67).
• Before connecting or loosening the equipotential bonding cable, ensure there are no
differences in potential.
Ensure that the gaskets and incised gasket ring are tight.
CAUTION!
The IP protection category of the signal converter housing is largely determined by the cable
gland used and the installation.
Connection terminals
The capacity of the connection terminals is 0.5 mm² to 2.5 mm².
The torque of the connection terminals is 0.6 Nm.

4.2 Power supply

The vortex flowmeter does not require a separate power supply. The required supply for the
built-in electronics is provided via the 4...20 mA current output or the bus connection.
16 www.siemens.com/flow
SITRANS FX330
08/2017 - A5E42667474-AA EN