BEKA BR323AL, Инструкция по эксплуатации

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5. INSTALLATION
5.1 Location
The appropriate model BR323AL or BR323SS
should be chosen depending on the severity of
the environment. The BR323AL is housed in an
epoxy painted aluminium enclosure and the
BR323SS in a stainless steel enclosure suitable
for marine applications. Both provide IP66 and
NEMA Type 4X protection.
Fig 5 BR323AL & BR323SS dimensions
5.2 Installation procedure
WARNING
Installation of a BR323AL or BR323SS
loop powered indicator should only be
performed in a potentially hazardous
area when an explosive atmosphere is
NOT present.
Ensure that glands, blanking plugs or
conduit connected to the indicator
have the same thread as the indicator
enclosure, which is shown on the
instrument certification label.
Recommended installation procedure:
a. Remove the flameproof enclosure cover
that contains the viewing window by
rotating anticlockwise.
b. Remove the BR323 electronic assembly
from the enclosure by gently squeezing the
retaining clip and pulling – see Fig 1. If
necessary remove the screw securing the
earthing wire connecting the electronic
assmebly to the enclosure.
c. Install the flameproof enclosure in the
required position and secure using the two
M10 mounting slots. The flameproof
enclosure should be earthed as specified
by the local code of practice.
d. Fit the required flameproof certified glands
or blanking plugs with the correct thread
into the two entries in the enclosure.
Instruments can have M20 x 1.5 threads
(M suffix on producr number) or ½ inch
NPT entries (N suffix on product number).
The instrument enclosure thread is shown
on the instrument certification label. The
installation must be as specified by the
manufacturer of the certified gland or
blanking plug and comply with the local
code of practice. Alternatively, correctly
threaded metal conduit may be used with
a flameproof certified compound filled
stopping box at each of the two entries.
Installation must be as specified by the
manufacturer of the stopping box and
comply with the local code of practice.
e. Position the electronic assembly in the
flameproof enclosure and connect the two
input terminals as shown in Figs 1 and 4.
If removed, the earthing cable should be
reconnected between the electronic
assembly and the flameproof enclosure.
f. Replace the flameproof enclosure cover
by rotating clockwise and tighten until the
sealing gasket is compressed.
5.3 EMC
The BR323AL and BR323SS comply with the
requirements of the European EMC Directive
89/336/EEC. For specified immunity all wiring
should be in screened twisted pairs, with the
screens earthed at one point in the safe area.