7
5.3 EMC
The BA324ND complies with the requirements of
the European EMC Directive 2004/108/EC. 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 BA324ND earth terminal to a local
earth, or to a cable screen which is earthed in the
safe area.
Fig 5 Dimensions and terminal connections
6. PROGRAMMING & CALIBRATION
The BA324ND is programmed and calibrated via
four push-buttons which are located behind the
instrument control cover.
CAUTION!
The four push-buttons are energy
limited and will not cause ignition in
normal operation. Ex 'n' certification
requires that the instrument enclosure
provides IP54 protection, the control
cover may therefore only be removed
for calibration when there is no
possibility of dust or water ingress.
Before replacing the cover ensure that
the sealing gasket is undamaged and
free from dirt and foreign bodies.
When frequent access to the push-buttons is
required, the indicator can be supplied with
external membrane push-buttons mounted on the
outside of the control cover. These push-buttons
are energy limited and may be operated when a
flammable atmosphere is likely to be present.
All the programming functions are contained in an
easy to use menu which is shown diagramatically
in Fig 6. Each function is summarised in section
6.1 which includes references to more detailed
information. Although this simple menu driven
system enables most adjustments to be made
without repeated reference to this manual, we
recommend that at least the summary of the
programmable functions in section 6.1 is read
before attempting programming or recalibration.
When the indicator is fitted with alarms,
linearisation or a tare function, the basic menu is
expanded to include functions associated with
these optional features. All the optional functions
are described in section 9 of this manual.
Throughout this manual push-buttons are shown in
italics e.g.
P
or
Up
push-button, and legends
displayed by the indicator are shown within
inverted commas e.g. 'CAL' and ' ALr2'.
Access to the programme menu is obtained by
operating the
P
and
E
push-buttons
simultaneously. If the instrument is not protected
by a security code the first parameter 'root' will be
displayed. If a security code other than the default
code 0000 has already been entered, the indicator
will display 'COdE'. Press
P
to clear this prompt
and enter the security code for the instrument
using the
Up
,
Down
and
P
push-buttons.
