User Manual

6
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 a
polyester powder coated aluminium enclosure and
the BR323SS in a 316 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
Directive 2014/30/EU. For specified immunity all
wiring should be in screened twisted pairs, with the
screens earthed at one point in the safe area.