Emerson GDU-Incus, Reference Manual

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Reference Manual
00809-0100-3003, Rev AA May 2019
15
Figure 3-11 Ferrite Bead Locations
Cable entry is via suitable hazardous area approved and ingress protection certified cable glands
(customer supply) or conduit. The ATEX/IECEx approved GDU-Incus has two positions for M20 cable
glands, while the FM approved unit has one position for ¾-in. (19 mm) NPT conduit. Cable glands and
conduit should be fitted in accordance with manufacturers’ instructions for assembly to a certified
flame proof enclosure. All unused cable entries should be sealed using a flame proof certified plugging
device. Ensure all cable gland and plugging devices are ingress protected to the same standard as the
enclosure to maintain certification and are suitable for the size of cable used. If the GDU-Incus is to be
installed in an ATEX ‘Zone 1’ Hazardous Area an Exd barrier seal must be used. All FM approved units
(US and Canada) must be sealed within 18-in. (457.2 mm) of enclosure entry using a suitably rated
conduit seal.
Thread size for cable entry is specified for each position on the terminal cover label. See section 8.1 for
further information.
The terminal compartment is sealed with two O-rings to prevent water ingress. Before closing it is
recommended that a visual inspection is undertaken to ensure the O-rings are in place and
undamaged. Also check the flame paths of the terminal cover and main enclosure for signs of damage.
Send the detector to Emerson for repair if the flame path is damaged. See
Figure 3-12 for O-ring and
flame path positions.