KROHNE BM 70A EEx EN User Manual
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07/2010 - 4000662402 MA BM70x-Ex-AD-R02-en
5.1.2.
Flange system WS (Wave Stick)
When installing the Wave Stick, make sure that:
the rod is always screwed down to the stop (plate or collar),
any integrated plate on antennas forms a proper sealing face,
the conductive plate on conductive antennas has adequately conductive contact with the tank
mounting flange (leakage resistance 10
6
)
the antennas are not subjected to radial loads when being installed
when mounting the G 1½" screw connection you will not damage the marking on the wrench
faces (do not use pipe wrench!).
5.2. Electrical connection BM 70A.-Ex, BM 70P.-Ex und BM 700-Ex
5.2.1.
General
5.2.1.1.
Terminal compartment
The electrical connection of the power supply and I/O functions is made in the terminal compartment
of the signal converter. The terminal compartment may optionally be designed in type of protection
Ex e, Ex d, Ex ei or Ex di, as described in Section 2 (Type Code) and Section 3 (Main safety-relevant
characteristics):
Terminal compartment in type of protection Ex e or Ex ei
Permissible as cable entries and blanking plugs are only parts certified to EN 60079-7. The cable
clamping area for the supplied cable entries measures 9 - 16 mm. Use cables with the appropriate
diameter, or approved cable entries with matched clamping area in accordance with their test
certificate.
Terminal compartment in type of protection Ex d or Ex di
The cables can basically be routed into the flameproof terminal compartment in one of two ways.
1)
Direct entry of the power cables by way of flameproof cable glands into the flameproof
terminal compartment requires a separate test certificate to EN 60079-1 for the flameproof glands.
2)
Direct entry of the power cables by way of conduits into the flameproof terminal compartment of
the device requires, after the conduit has been screwed in, a flameproof joint in accordance with ISO
965 / DIN 13 with a minimum of five full turns depth of engagement. A suitable stopping box
(EN 60079-1) shall be provided within 450 mm of the entry into the terminal compartment. Installation of
the conduit must be carried out in keeping with its separate test certificate. As a rule, an EN 60079-1
certified adapter is required between the ‘PG thread’ (heavy-gauge conduit thread) of the terminal
compartment and the conduit thread.
3)
Direct entry of the power cords by use of conduits into the conical thread adapters. Only pipes
with a connection thread, subject to the regulations of the adapter, are allowed to be entered into the
thread adapters. The threads of the conduits must meet the requirements of the standard EN 60079-1
(min. number of 6 convolutions). A convenient spark arrester must be provided within 450mm distance
in front of the connection room.
Attention!
Attention should be paid to the proper fastening of the thread adapters in the housing.
This applies in particular after dismantling of the conduit. The devices have to be
switched zero potential before dismantling the conduit.
The necessary standby time before opening the housing has to be considered before
loosing the conduit adapters.