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5. INSTALLATION
5.1 Location
The BA354ND rate totaliser is housed in a robust
IP66 glass reinforced polyester (GRP) enclosure
incorporating an armoured glass window and
stainless steel fittings. It is suitable for exterior
mounting in most industrial environments,
including off-shore and waste water treatment.
Please consult BEKA associates if high vibration is
anticipated.
The BA354ND enclosure is surface mounting.
Accessory kits described in sections 9.5 & 9.6 of
this manual enable the instrument to be mounted
onto a vertical or horizontal pipe, or directly onto a
flowmeter conduit entry.
The field terminals and the two mounting holes are
located in a separate compartment with a sealed
cover allowing the instrument to be installed
without exposing the display assembly.
Terminals 2 and 4 are internally joined and may be
used for linking the return 4/20mA wire - see Fig 2.
Similarly terminals 5 and 6 are internally joined and
may be used for linking the cable screens. The
BA354ND earth terminal is connected to the
internal EMC filters. For maximum radio frequency
interference rejection this terminal should be
connected to a cable screen which is earthed in
the safe area.
To prevent circulating currents,
cable screens should only be earthed at one point
in the safe area.
The BA354ND enclosure is supplied with a
bonding plate to ensure electrical continuity
between the three conduit / cable entries.
5.2 Installation Procedure
Fig 4 illustrates the instrument installation
procedure.
a.
Remove the instrument terminal cover by
unscrewing the two captive 'A' screws.
b.
Mount the instrument on a flat surface and
secure with two M6 screws through the 'B'
holes. Alternatively use one of the mounting
kits described in section 9.5
c.
Remove the temporary dust seals from the
three cable entries and install the required
glands, conduit fittings or blanking plugs. To
comply with the BA354ND ATEX certification
requirements these fittings must be Ex n or
Ex e approved.
Note:
The temporary dust seals do not
provide IP66 protection.
d.
Connect the field wiring to the terminals as
shown in Fig 5.
e. Replace the instrument terminal cover and
evenly tighten the two 'A' screws.
Fig 4 BA354ND installation procedure
5.3 EMC
The BA354ND complies with the requirements of
the European EMC Directive 2004/108/EEC. For
specified immunity all wiring should be in
screened twisted pairs, with the screens earthed
in the safe area.
Additional immunity may be obtained by
connecting the BA354ND earth terminal to a
cable screen which is earthed in the safe area.
