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5. INSTALLATION
5.1 Location
The BA354D 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 BA354D 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
BA354D earth terminal is connected to the internal
EMC filters. For maximum radio frequency
interference rejection this terminal should be
connected to a local earth, or 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 BA354D 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.
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 BA354D installation procedure
5.3 EMC
The BA354D 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 BA354D earth terminal to a local
earth, or to a cable screen which is earthed in the
safe area. If this terminal is not connected,
personal and intrinsic safety will not be degraded.
