ELECTRICAL CONNECTIONS
4
13
OPTISWIRL 5080
www.krohne.com
07/2020 - 4008054001 - AD OPTISW5080 Exd Gb-Db en R01
4.1 General notes
Terminal compartment
The signal output circuits are electrically connected in the terminal compartment of the signal
converter. The terminal compartment is designed in type of protection flameproof enclosure "d"
and dust ignition protection by enclosure "t". Unused entries are to be closed in accordance with
EN 60079-1 or EN 60079-31. The entry of the cables in the connection terminal is possible in the
following way.
•
For applications requiring EPL Gb rated equipment:
Direct entry of the connecting cables by way of approved flameproof cable glands (M20x1.5)
into the flameproof terminal compartment (V
≤
2000 cm
³
). Certified cable glands in
accordance with IEC/EN 60079-1 are required. Observe the requirements for the correct
installation of the cable glands.
or
Direct entry of the connecting cables by way of approved conduits into the flameproof
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
requirements.
The conduit must be installed in compliance with its manufacturers instructions.
•
For applications requiring EPL Db rated equipment:
Direct entry of the connecting cables by way of approved dust proof cable glands (M20x1.5)
into the dust proof terminal compartment (V
≤
2000 cm
³
). Certified cable glands in
accordance with IEC/EN 60079-31 are required. Observe the requirements for the correct
installation of the cable glands.
Metal blind plug for unused openings
To prevent possible explosion and to maintain explosion proof/flameproof and dust ignition proof
protection, plug unused openings with the provided metal blind plug.
This plug must be engaged a minimum of five full threads.
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 analogue output.
CAUTION!
The threaded housing covers must be installed. Turn covers to seat O-ring into the housing and
then continue to hand tighten until the cover contacts the housing metal-to-metal.
