ELECTRICAL CONNECTIONS
4
19
OPTISWIRL 4200
www.krohne.com
08/2016 - 4005002601- AD OPTISWIRL4200 Ex-II2GD R01
4.1 General notes
Rated values for insulation
•
The insulation of the vortex flowmeter OPTISWIRL 4200 . .. - 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 cm
³
). 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 / 0.3". 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 cm
³
). 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.
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 (7...12 mm / 0.27...0.47").
