1.
DESCRIPTION
The BA304NE and BA324NE are field mounting, Ex nA
and Ex tc certified digital indicators that display the current
flowing in a 4/20mA loop in engineering units. They are
loop powered but only introduce a 1.2V drop into the loop.
The two models are electrically similar, but have different
size displays.
Model
Display
BA304NE
4 digits 34mm high
BA324NE
5 digits 29mm high and
31 segment bargraph.
This abbreviated instruction sheet is intended to assist with
installation and commissioning, a comprehensive
instruction manual describing safety certification, system
design and calibration is available from the BEKA sales
office or may be downloaded from our website.
Both models have ATEX and IECEx certification permitting
installation in Zone 2 flammable gas and Zone 22
combustible dust atmospheres without the need for Zener
barriers or galvanic isolators. The certification label, which
is located on the top of the instrument enclosure, shows
the certificate numbers and the certification codes. Copies
of certificates may be downloaded from our website.
All models have gas and dust certification.
2.
INSTALLATION
The BA304NE and BA324NE indicators have robust IP66
glass reinforced polyester (GRP) enclosures incorporating
an armoured glass window and stainless steel fittings.
They are suitable for exterior mounting in industrial Zone 2
or Zone 22 environments.
They are surface mounting, but may be pipe mounted
using an accessory kits.
Fig 1 shows the installation procedure.
Fig 1 Installation procedure
Fig 2 Dimensions and terminal connections
The indicator’s earth terminal is connected to the carbon
loaded GRP enclosure. If this enclosure is not bolted to an
earthed post or structure, the earth terminal should be
connected to the plant potential equalising conductor.
A bonding plate is provided to ensure electrical continuity
between the three conduit / cable entries.
Terminals 8, 9, 10 & 11 are only fitted when the indicator
includes optional alarms. See full manual for details.
Terminals 12, 13 & 14 are only fitted when the indicator
includes an optional backlight. See full manual for details.
EMC
For specified immunity all wiring should be in screened
twisted pairs, with the screens earthed in the safe area.
Fig 3 Typical measurement loop
Units of measurement & tag number
Both indicators have an escutcheon around the liquid
crystal display which can be printed with any units of
measurement and tag information specified when the
indicator was ordered. If no information is supplied a blank
escutcheon will be fitted but legends may be added on-site
via an embossed strip, dry transfer or a permanent marker.
Printed escutcheons are available from BEKA as an
accessory which should be fitted on top of the blank
escutcheon. Do not remove the blank escutcheon.
To gain access to the escutcheon remove the terminal
cover by unscrewing the two 'A' screws which will reveal
two concealed 'D' screws. If the instrument is fitted with an
external keypad, also unscrew the two 'C' screws securing
the keypad and unplug the five way connector. Finally
unscrew all four 'D' screws and carefully lift off the front of
the instrument.
3.
OPERATION
The indicators are controlled and configured via four push
buttons located behind the instrument control cover, or via
an optional keypad on the outside of the control cover. In
the display mode i.e. when the indicator is displaying a
process variable, these push buttons have the following
functions:
P
While this button is pushed the indicator will
display the input current in mA, or as a
percentage of the instrument span depending
upon how the indicator has been condtioned.
When the button is released the normal display in
engineering units will return. The function of this
push button is modified when optional alarms are
fitted to the indicator.
While this button is pushed the indicator will
display the numerical value and analogue
bargraph* the indicator has been calibrated to
display with 4mA input. When released the normal
display in engineering units will return.
While this button is pushed the indicator will
display the numerical value and analogue
bargraph* the indicator has been calibrated to
display with 20mA input. When released the
normal display in engineering units will return.
E
No function in the display mode unless the tare
function is being used.
P
+
Indicator displays firmware number followed by
version.
P
+
When optional alarms are fitted provides direct
access to the alarm setpoints if the ‘ACSP’ access
setpoints in display mode function has been
enabled.
P
+
E
Provides access to the configuration menu via
optional security code.
* Only the BA324NE has a bargraph
Issue 2
10th March 2014
BEKA associates Ltd
.
Old Charlton Rd, Hitchin, Hertfordshire,
SG5 2DA, UK Tel: +44(0)1462 438301 Fax: +44(0)1462 453971
e-mail:
Abbreviated Instruction for
BA304NE and BA324NE Ex nA and Ex tc
field mounting loop powered indicators
The BA304NE & BA324NE are CE marked to show
compliance with the European Explosive Atmospheres
Directive 94/9/EC and the European EMC Directive
2004/108/EC
