BEKA BA304SG Quick Start Manual

1. DESCRIPTION
The BA304SG and BA324SG are field mounting, increased
safety Ex eb loop powered 4/20mA digital indicators. They are
a lower cost alternative to a flameproof Ex d indicator featuring
a large, easy to read display.
The two models are mechanically and electrically identical, but
have different size displays. A loop powered display backlight
is available as a factory fitted option.
BA304SG 4 digits 34mm high
BA324SG 5 digits 29mm high + 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 may be downloaded from www.beka.co.uk or
requested from the BEKA sales office. An application guide
AG320 is also available.
Both models have IECEx and ATEX certification and may be
installed exactly as an Ex d flameproof indicator in Zones 1
or 2 without the need for a Zener barrier or galvanic isolator.
The indicators may be safely connected in series with any
4/20mA hazardous area loop with a supply up to 30V dc,
employing any type of certified explosion protection including,
flameproof Ex d, pressurised Ex p, encapsulated Ex m or
increased safety Ex e. The BA304SG and BA324SG should
not be used with intrinsically safe Ex i equipment.
The BA304SG and BA324SG may also be used as an
alternative to a certified Ex nA indicator in Zone 2.
Both indicators have dust ignition protection by enclosure
Ex tb that allows them to be installed in Zones 21 and 22.
BA304SG 4 Digit Indicator
Ex eb ib mb IIC T5 Gb
0359 II 2GD
Ex ib mb tb IIIC T80°C Db
-40°C  Ta  +60°C
WARNING - Do not connect or disconnect when energised
ITS19ATEX304891X
U = 30Vdc
N
IECEx ITS19.0018X
Year of manufacture shown within terminal compartment
associates
Hitchin England www.beka.co.uk
BA304SG certification information label
2. INSTALLATION
The BA304SG and BA324SG have a robust glass reinforced
polyester (GRP) carbon loaded enclosure which provides
IP66 ingress and 7J impact protection. They are suitable for
exterior surface mounting in most industrial environments, or
may be pipe or panel mounted using an accessory kit.
Both back-box cable entries have M20 x 1.5 threads with an
Ex e and Ex t certified stopping plug fitted in the right hand entry.
The left hand entry has a temporary plug to prevent the ingress
of dust and dirt during transportation and should be replaced
with a certified Ex e and Ex t cable gland or conduit entry.
To prevent the build up of an electrostatic charge the indicator
enclosure is slightly electrically conductive. If the indicator
enclosure is not mounted on a metal structure that provides
a discharge path, it should be earthed using the instrument's
internal earth terminal.
Both models are CE marked to show compliance with the
European Explosive Atmospheres Directive 2014/34/EU and
the European EMC Directive 2014/30/EU
A A
Step A
Unscrew the four captive 'A' screws,
lift off the indicator assembly and
un-plug the wires from the
back-box as shown in fig 2.
A A
B B
Step B
Secure the enclosure back-box to a
flat surface with M6 screws through
the four 'B' holes. Alternatively use
E 1 2 3 4 5 6
a pipe on panel mounting kit.
B B
Step C
Remove the temporary hole plug and
install an Ex e cable gland or conduit
fitting. Feed the field wiring through
E 1 2 3 4 5 6 the cable entry and connect to
terminals in back-box.
Step E
A A
Plug the indicator assembly
wires into the back-box connector.
Check sealing gasket before replacing
the indicator assembly and securing by
evenly tightening the four 'A' screws.
A A
Fig 1 Installation procedure
Abbreviated Instruction for
BA304SG & BA324SG
Ex eb and Ex tb field mounting
loop powered indicators
Certification
information label
SCA LE
TAG NUM BER
SCA LE
9 9 . 3 2 4
TAG NUM BER
9 . 3 0 4
Issue 1
20th August 2019
BEKA associates Ltd. Old Charlton Rd, Hitchin, Hertfordshire,
SG5 2DA, UK Tel: +44(0)1462 438301 Fax: +44(0)1462 453971
e-mail: sales@beka.co.uk web: www.beka.co.uk
Optional
122 84
stainless
steel
30
legend
plate.
90
120
19
Four M6 clearance holes
106
for surface mounting.
Two M20 x 1.5 threaded cable
entries. Supplied with an Ex e
90
stopping plug and one
temporary hole plug.
Indicator assembly
connector
Terminals 2 & 4 Terminals 5 & 6
internally linked internally linked
for joining return E 1 2 3 4 5 6 for joining cable
4/20mA wire. screens.
Enclosure earth + - Voltage drop
5.3 without backlight
9.1 with backlight
4/20mA
Fig 2 Dimensions and terminal connections
EMC
For specified immunity all wiring should be in screened
twisted pairs, with the screens earthed in the safe area.
Hazardous area Zone 1 or 2 Safe area
BA304SG or
BA324SG
Ex eb indicator
1 2 3 4 5 6
30V dc
4/20mA 4/20mA max
Transformer
2-wire transmitter
Flameproof Ex d , Pressurised Ex p,
Encapsulated Ex m or Ex nA in Zone 2
Fig 3 Typical measurement loop
Scale card
The indicator's units of measurement and tag information
are shown above the display on a slide-in scale card.
New instruments are fitted with a scale card showing the
information requested when the instrument was ordered, if
this is not provided a blank scale card will be fitted which can
easily be marked on-site. Custom printed scale cards are
available from BEKA associates.
To remove the scale card, carefully pull the tab perpendicularly
away from the rear of the indicator assembly. See Fig 4 for
the location of the scale card tab.
To replace the scale card carefully insert it into the slot on the
right hand side of the indicator assembly which is shown in
Fig 4. Force should be applied evenly to both sides of the
scale card to prevent it twisting. The card should be inserted
until about 2mm of the transparent tab remains protruding.
Rear view
Fig 4 Inserting scale card into the instrument assembly.
3. OPERATION
Both models are controlled and calibrated via four front panel
push buttons. In the display mode i.e. when the indicator is
displaying a process variable, these push buttons have the
following functions:
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 configured. When the button is
released the normal display in engineering units
will return.
While this button is pushed the indicator will display
&
the numerical value and analogue bargraph¹ the
indicator has been calibrated to display with a
4mA² input. When released the normal display in
engineering units will return.
isolated
While this button is pushed the indicator will display
Power *
the numerical value and analogue bargraph¹ the
supply
indicator has been calibrated to display with a
20mA² input. When released the normal display in
engineering units will return.
No function in the display mode unless the tare
)
function is being used.
( + & Indicator displays firmware number followed by
version.
( + ) Provides access to the configuration menu via
optional security code.
Note ¹ Only BA324SG has bargraph
² If the indicator has been calibrated using
the CAL function, calibration points may not be 4
and 20mA.
Front view