BEKA BA243 User manual

3.1 Associated apparatus Ex i certication
The BA243 has IECEx, ATEX and UKCA associated apparatus intrinsic
safety Ex ia IIC certication:
IECEx IECEx CML 20.0080X
ATEX CML 20 ATEX 2122X
UKCA CML 21 UKEX 2278X
Copies of these certicates may be downloaded from the BEKA
associates website www.beka.co.uk.
The certicates ‘X’ su󰀩x indicates that the BA243 must be powered
from a 30V maximum SELV, PELV or supply providing double or
reinforced insulation as explained in section 5.1.
The IECEx, ATEX and UKCA approvals specify the same certication
code and output safety parameters.
Location
Safe area
Certication code
IECEx [Ex ia Ga] IIC -40ºC [Ta [+70ºC
ATEX II(1) G [Ex ia Ga] IIC -40ºC [Ta [+70ºC
UKCA II(1) G [Ex ia Ga] IIC -40ºC [Ta [+70ºC
Output parameters of each channel
Each channel is a separate galvanically isolated circuit
Gas group
IIC IIB IIA
Uo = 12.4V 12.4V 12.4V
Io = 0.67A 0.67A 0.67A
Maximum output current 130mA
Po = 1.36W 1.36W 1.36W
Co = 1.24µF 7.9µF 30.0µF
Lo = 79µH 317µH 634µH
Lo/Ro = 17µH/Ω68µH/Ω137µH/Ω
3.2 Increased safety Ex ec certication
To allow the BA243 to be mounted in Zone 2, it has been issued
with IECEx, ATEX and UKCA Ex ec increased safety component
certication:
IECEx IECEx CML 20.0081U
ATEX CML 20 ATEX 2123U
UKCA CML 21 UKCA 3279U
Location
Zone 2
Certication code
IECEx Ex ec [ia Ga] IIC Gc -40ºC [Ta [+70ºC
ATEX II 3(1) G Ex ec [ia Ga] IIC Gc -40ºC [Ta [+70ºC
UKCA II 3(1) G Ex ec [ia Ga] IIC Gc -40ºC [Ta [+70ºC
Output parameters
As associated apparatus Ex ia certication – see 3.1 above.
Copies of these certicates may be downloaded from the BEKA
associates website www.beka.co.uk.
The ‘U’ su󰀩x indicates that these are component certicates. They
specify that the BA243 must be installed in an enclosure providing
a minimum of IP54 protection which complies with IEC60079-0 and
IEC60079-7, such as an Ex e component approved enclosure.
1. INTRODUCTION
These instructions describe the function, certication, installation, safe
use and maintenance of the BEKA BA243 Four Channel Power Isolator.
This isolator is primarily intended for powering BEKA intrinsically safe
Pageant equipment, but may be used to power other intrinsically safe
hazardous area apparatus having compatible intrinsic safety input
parameters.
2. DESCRIPTION
The BA243 Power Isolator has four identical, totally independent,
galvanically isolated intrinsically safe outputs with associated
apparatus certication. It may be installed in a safe area or with
additional mechanical protection in Zone 2.
The BA243 clips onto a standard 35mm DIN rail and may be powered
by any 20 to 30V dc, SELV or PELV supply, or from a supply with
double or reinforced insulation. No earth connection is required. The
status of each channel is indicated by two green LEDs adjacent to the
input and the output terminals.
3. CERTIFICATION
The BA243 Power Isolator has IECEx, ATEX and UKCA [Ex ia Ga] IIC
intrinsic safety associated apparatus certication for installation in a
safe area. It also has increased safety Ex ec component certication
permitting installation in Zone 2 when housed in an Ex e enclosure.
BA243 Four Channel
Power Isolator Instructions
Blue hazardous
area terminals
Input status
LED
Duplicated green
safe area terminals
Output status
LED
InputOutput
InputOutput
Input
BA243
Output
InputOutput
The BA243 Power Isolator is CE marked to
show compliance with the European Explosive
Atmospheres Directive 2014/34/EU and the European
EMC Directive 2014/30/EU.
The BA243 Power Isolator is also UKCA marked to
show compliance with UK statutory requirements
Equipment and Protective Systems Intended for Use
in Potentially Explosive Atmospheres Regulations
UKSI 2016:1107 (as amended) and with the
Electromagnetic Compatibility Regulations UKSI
2016:1091.
Issue 3
16th August 2023

To t a wire into a safe area terminal, insert an instrument screwdriver
into the slot at the side of the wire entry and gently push the screwdriver
towards the entry as shown in Fig 3. This will open the gripping
spring and allow a wire to be inserted into the terminal. When the
screwdriver is withdrawn the wire will be secured. Only one wire
should be inserted into each terminal.
Fig 3 Inserting a wire into a safe area terminal
Each BA243 intrinsically safe output has a separate removable blue
terminal block.
To remove a BA243 isolator from the DIN rail, use a screwdriver to
gently slide the two red securing clips outwards as shown in Fig 4.
1
2
Unclip both fixings
to remove isolator
InputOutput
InputOutput
Input
BA243
Output
InputOutput
Fig 4 Removing BA243 from the DIN rail
4.2 Installation in safe area
The BA243 Power Isolator is intrinsically safe associated apparatus
and should be installed in a safe area. The BA243 enclosure provides
IP20 protection, therefore for most industrial installations additional
protection will be required.
4.3 Installation in Zone 2
The BA243 isolator has IECEx, ATEX and UKCA Ex ec increased
safety component certication. When mounted inside an enclosure
complying with the requirements specied by EN/IEC 60079-0 Clause
1 and providing at least IP54 protection required by IEC 60079-7, the
assembly may be located in Zone 2. An Ex e component certied
enclosure satises these requirements.
Component certicates are only intended to be used as part of a certied
assembly, the Power Isolator and the enclosure should therefore be be
assessed to ensure they are compatible.
4.4 Installation in Zone 22
The IECEx, ATEX and UKCA Ex ec certicates for the BA243 isolator
specify that it is suitable for use in Ex tb applications when installed
inside a suitable enclosure.
3.3 Certication information label
BA243 Power isolators have a label on the side of the enclosure
showing a summary of certication information together with a serial
number and year of manufacture.
Fig 1 Certication information label
4. INSTALLATION
The BA243 should only be installed by trained competent personnel.
BA243
Power Isolator
2
1
-
+
Blue hazardous
area terminals
Green safe area terminals
Safe area terminals of the four channels are externally connected together
58mm 50.5mm 97mm
+
-
120mm
2.5mm
+
-
+
-
Fig 2 BA243 dimensions & terminals
4.1 Mounting
The BA243 is DIN rail mounting and may be clipped onto any low
or high prole 35mm wide ‘top hat’ rail complying with DIN46277,
EN50022 or BS5584. A horizontal or vertical rail may be used, but
if the ambient temperature is likely to exceed 30°C a horizontal rail
with an unrestricted layout that permits air to be convected through
the BA243’s ventilation slots is recommended. The gap between
adjacent BA243 isolators should be increased to 5mm if the ambient
temperature is likely to exceed 40°C.
Each channel has duplicated green Ex e approved safe area terminals.
When delivered the safe area terminals of all four channels will be
externally connected together as shown in Fig 2, therefore supplying
power to channel 1 or 4 will power all the channels. If required these
exterior links may be removed allowing each channel to be connected
to a separate power supply.

5.3 Operation
Immediately power is applied the BA243 will start to function. The
status of each channel is shown by two green LED indicators adjacent
to the input and output terminals. The LED by the green input terminals
is illuminated when this channel of the BA243 is receiving power. The
LED adjacent to the blue output terminals indicates the output status as
shown below.
CAUTION
When the BA243 is mounted in Zone 2, live maintenance
should only be performed when it is permitted by risk
analysis, or when there is no risk of a ammable atmosphere
being present.
Input LED Output LED Meaning Cause / Action
On On
This
channel
of the
BA243 is
functioning
correctly.
On Flashing
Output
current
limit of this
channel
has been
activated.
The load is too large
and is trying to draw
more than 130mA from
this channel.
Reduce load to resume
normal operation.
On O󰀨
The output
hazardous
area wiring
connected
to this
channel is
faulty.
or
The BA243
is faulty.
Remove the load
for this channel
by unplugging the
channel’s blue terminal
block. If the output
LED is then illuminated
check the eld wiring.
If the output LED is not
illuminated when the
blue terminal block is
unplugged, replace the
BA243 Power Isolator
with another BA243.
5.4 Application Guide
Application Guide AG210, which contains additional information about
the BA243 Power Isolator, may be downloaded from the BEKA website
www.beka.co.uk.
5. ELECTRICAL SYSTEM DESIGN
The BA243 is primarily intended for powering BEKA intrinsically safe
Pageant displays for applications in IIC gases, but it may be used to
power other certied hazardous apparatus having compatible intrinsic
safety input parameters.
The isolator is designed to output the maximum permissible power into
a IIC gas (hydrogen) hazardous area. Although the four BA243 outputs
are safe when connected in parallel, the resulting cable parameters are
prohibitive small. This limitation has been overcome by combining the
four channels via a diode network at the remote point of use as shown
in Fig 5.
The four cables connecting the BA243 Power Isolator to the remote load
may be part of a multicore cable complying with Type A or B requirements
dened in clause 16.2.2.8 of IEC60079-14 Electrical installation design,
selection and erection.
Safe areaHazardous area
IIC (hydrogen) gas
BA243
Diode combining network
such as BEKA BA3901
Power supply combiner
+
-
+
-
+
-
+
-
Channel 1
Channel 2
Channel 3
Channel 4
Multicore cable
Type A or B
30V
Safety parameters
Uo= 12.4V
Io= 2.68A
Po= 5.4W
L/R ratio of each pair of
wires to be less than 17H/Ω
Fig 5 Combining 5 channel outputs at point of use
5.1 Power supply
The BA243 has a Um of 30V dc and should be powered from a 20 to 30V
dc supply complying with one of the following:
• SELV (separated or safety extra low voltage)
• PELV (protected extra low voltage supply)
• Employing a safety isolating transformer with double or
reinforced insulation.
• Complying with IEC60950 series, IEC81010-1 or
technically equivalent standard..
• Directly from cells or batteries
Most low voltage instrument supplies satisfy this requirement.
Compliance with the European or UK Low Voltage Directive conrms
the supplies suitability.
5.2 Intrinsically safe output
The BA243 output safety parameters are shown in section 3. The
isolator employs active voltage and current limits and each channel has
the typical output characteristic shown in Fig 6.
When the output load exceeds the current limit the output voltage falls
to zero. When the load is reduced the output voltage is automatically
restored.
Output current mA
0 130mA (122mA min)
11.7V
9.1V (8.6V min)
Output voltage
Fig 6 BA243 typical output characteristic for each channel

6. ACCESSORIES
6.1 Tag number
The BA243 isolator can be supplied with each channel identied by
a tag number thermally printed onto the label between the two status
LEDs. Alternatively, a tag number may be added on-site in this space
using a self-adhesive label.
7. ROUTINE MAINTENANCE
The mechanical condition of the isolator and terminations should be
regularly checked. Inspections frequency should be adjusted to suit
the environmental conditions.
8. SERVICING
No attempt should be made to repair a faulty BA243 Power Isolator.
Suspect isolators should be returned for repair to BEKA associates or
to your local BEKA agent.
9. GUARANTEE
Power Isolators which fail within the guarantee period should be
returned to BEKA associates or your local BEKA agent. It is helpful if
a brief description of the fault symptoms is provided.
10. CUSTOMER COMMENTS
BEKA associates is always pleased to receive comments from
customers about our products and services. All communications are
acknowledged and whenever possible, suggestions are implemented.
Old Charlton Rd, Hitchin, Hertfordshire, SG5 2DA, UK
Tel: [phone] e-mail: [email protected]
web: www.beka.co.uk
All associated manuals, certificates, and
datasheets can be downloaded from
https://www.beka.co.uk/qr-ba243_1