Electrical Connections; General Notes - Siemens SITRANS F Series 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 terminal compartment is designed in protection type "d" and/or "e" or in protection type "t".
Unused entries are to be closed in accordance with EN 60079-1, EN 60079-7 or EN 60079-31.
The entry of the cables in the connection terminal is possible in the following way.
• Device version Ex db ia IIC T6...T2 Gb or Ex db [ia] IIC T6
Direct entry of the connecting cables by way of approved flameproof cable glands (M20x1.5)
into the flameproof terminal compartment (V ≤ 2000 cm³). The cable glands require a
separate test certificate in accordance with EN 60079-1. Observe the requirements of the test
certificate for the cable glands.
• Device version Ex db ia IIC T6...T2 Gb or Ex db [ia] IIC T6
Direct entry of the connecting cables by way of conduits into the flameproof enclosed
terminal compartment of the device. Once the conduit has been screwed in, it must form a
flameproof joint with the housing with a minimum thread length of 8 mm. A suitable
mechanical stopping box must be provided in accordance with installation provisions. The
conduit must be installed in compliance with its separate test certificate.
• Device version Ex db eb ia IIC T6...T2 Gb or Ex db eb [ia] IIC T6
Direct entry of the connecting cables by way of approved cable glands (M20x1.5) into the
terminal compartment in protection type increased safety.
The cable glands require a separate test certificate in accordance with EN 60079-7. Observe
the requirements of the test certificate for the cable glands.
• Device version Ex tb ia IIIC T70...T240 Db or Ex tb [ia] IIIC T70°C Db
Direct entry of the connecting cables by way of approved dustproof cable glands (M20x1.5)
into the dustproof terminal compartment (V ≤ 2000 cm³).
The cable glands require a separate test certificate in accordance with EN 60079-31. Observe
the requirements of the test certificate for the cable glands.
20 www.siemens.com/flow
SITRANS FX330
09/2018 - A5E40861058-AB