BEKA BA212 User manual

3.1 Associated apparatus Ex i certication
The BA212 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 BA212 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, UKCA, 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
Gas group
IIC IIB IIA
Uo = 12.4V 12.4V 12.4V
Io = 2.66A 2.66A 2.66A
Maximum output current 500mA
Po = 5.2W 5.2W 5.2W
Co = 1.24µF 7.9µF 30.0µF
Lo = 5µH 20µH 40µH
Lo/Ro = 4.3µH/Ω 17µH/Ω 34µH/Ω
3.2 Increased safety Ex ec certication
To allow the BA212 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 21UKEX 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 BA212 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 BA212 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 BA212 Power Isolator is a galvanically isolated power supply
with an intrinsically safe output which has associated apparatus
certication. It may be installed in a safe area or with additional
mechanical protection in Zone 2.
The BA212 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
power supply status is indicated by two green LEDs adjacent to the
input and the output terminals.
3. CERTIFICATION
The BA212 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.
Input status
LED
Green safe
area terminals
Blue hazardous
area terminals
Output status
LED
Input
BA212
Output
BA212 Power
Isolator Instructions
The BA212 Power Isolators are CE marked to
show compliance with the European Explosive
Atmospheres Directive 2014/34/EU and the European
EMC Directive 2014/30/EU.
The BA212 Power Isolators are also UKCA marked
to show compliance with UK statutory requirements
Equipment and Protective Systems Intended for Use
in Potentially Explosive Atmospheres Regulations
2016 SI 2016 No 1107 and with the Electromagnetic
Compatibility Regulations SI 2016 No 1091.
Issue 1
20th July 2021

Fig 3 Inserting a wire into a safe area terminal
The BA212 intrinsically safe output has a removable blue terminal
block.
To remove a BA212 isolator from the DIN rail, use a screwdriver to
gently slide the red securing clip outwards as shown in Fig 4.
Input
BA212
Output
Fig 4 Removing BA212 from the DIN rail
4.2 Installation in safe area
The BA212 Power Isolator is intrinsically safe associated apparatus
and should be installed in a safe area. The BA212 enclosure provides
IP20 protection, therefore for most industrial installations additional
protection will be required.
4.3 Installation in Zone 2
The BA212 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 BA212 isolator
specify that it is suitable for use in Ex tb applications when installed
inside a suitable enclosure.
3.3 Certication information label
BA212 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 BA212 should only be installed by trained competent personnel.
BA212
Power Isolator
2
1
+
-
+
-
-
+
120mm
2.5mm
Blue
hazardous
area
terminals
Green
safe area
terminals
58mm 50.5mm 22.6mm
Fig 2 BA212 dimensions & terminals
4.1 Mounting
The BA212 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 BA212’s ventilation slots is recommended. The gap between
adjacent BA212 isolators should be increased to 5mm if the ambient
temperature is likely to exceed 40°C.
The safe area green terminals, which connect the BA212 to a power
supply, are Ex e approved. To t a wire into a 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.

5.3 Operation
Immediately power is applied the BA212 will start to function. Status
is shown by two green LED indicators adjacent to the input and output
terminals. The LED by the green input terminals is illuminated when
the BA212 is receiving power. The LED adjacent to the blue output
terminals indicates the output status as shown below.
CAUTION
When the BA212 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
BA212 is
functioning
correctly.
On Flashing
Output
current limit
has been
activated.
The BA212 load is too
large and it is trying
to draw more than
500mA. Reduce load
to resume normal
operation.
On O󰀨
The output
hazardous
area wiring
is faulty.
or
The BA212
is faulty.
Remove the BA212
load by unplugging
the blue terminals. If
the output LED is then
illuminated check the
eld wiring.
If the output LED is
not illuminated when
the blue terminals are
unplugged, replace the
BA212 Power Isolator.
5.4 Application Guide
Application Guide AG210, which contains additional information about
the BA212 Power Isolator, may be downloaded from the BEKA website
www.beka.co.uk.
5. ELECTRICAL SYSTEM DESIGN
The BA212 is primarily intended for powering BEKA intrinsically safe
Pageant displays, 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
the hazardous area, therefore the external inductance Lo that can be
connected is very small. Applications in group IIC gases (hydrogen)
are only possible when the BA212 Power Isolator and the hazardous
area load are only a few metres apart. For applications in a IIC gas
where the load and the isolator are separated, please see BEKA power
isolator BA243.
Ex ec component certication permits the BA212 Power Isolator to be
installed in Zone 2 when mounted inside an Ex e component certied
enclosure or cabinet. Ex component equipment is not intended to be
used alone. When an Ex ec component certied BA212 Power Isolator
is mounted in an Ex e component certied enclosure, the resulting
Ex equipment requires assessment to conrm that the two may be
safely used together. Please see BEKA Application Guide AG210
for additional information about installation of the BA212 Power Isolator
in Zone 2, selection of an enclosure and recommended equipment
assessment.
5.1 Power supply
The BA212 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.
• Fed 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 BA212 output safety parameters are shown in section 3. The
isolator employs active voltage and current limits and has the typical
output characteristic shown in Fig 5.
Output current mA
0 500mA (480 min)
11.7V
8.8V (8.5 min)
Output voltage
Fig 5 BA212 typical output characteristic
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.
BEKA associates Ltd, Old Charlton Rd., Hitchin, Herts. SG5 2DA
Tel: [phone] Fax: [phone] www.beka.co.uk