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5. INSTALLATION
5.1 Location
The BA304D indicator is housed in a robust IP66
glass reinforced polyester (GRP) enclosure
incorporating an armoured glass window and
stainless steel fittings making it suitable for exterior
mounting in most industrial applications, including
offshore and waste water treatment. Please
consult BEKA associates if high vibration is
anticipated.
The BA304D is surface mounting, but may be pipe
or stem mounted using the accessory kits
described in section 8 of this manual.
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 or controls.
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 BA304D 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 in the safe area.
The BA304D enclosure is fitted 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 screws or bolts through the two
'B' holes. Alternatively use one of the pipe or
stem mounting kits described in sections 8.5
and 8.6
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 supplied with
the instrument 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
tighten the two 'A' screws.
Fig 4 BA304D installation procedure
Fig 5 Dimensions and terminal connections
5.3 EMC
The BA304D complies with the requirements of the
European EMC Directive 89/336/EEC. For
specified immunity all 4/20mA wiring should be in
screened twisted pairs, with the screen earthed
within the safe area.
