E2S BExBG05D-P-SIL User manual

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 1 of 17 (1)
INSTRUCTION MANUAL (ATEX/IECEx/SIL2)
BExBG05D-P-SIL Flameproof Xenon SIL 2
Beacons For use in Flammable Gas and Dust
Atmospheres
1) Warnings
•DO NOT OPEN WHEN AN EXPLOSIVE
ATMOSPHERE IS PRESENT
•DO NOT OPEN WHEN ENERGIZED
•POTENTIAL ELECTROSTATIC CHARGING
HAZARD
•COVER BOLTS CLASS A4-80
•USE HEAT RESISTING CABLES AND CABLE
GLANDS (RATED 110°C) AT AMB.
TEMPERATURES OVER 40°C
2) Rating & Marking Information
All units have a rating label, which carries the following
important information:-
Model No.: BExBG05D-P-SIL
Input Voltage: DC Units 24V
BExBG05D-P-SIL Codes:
Ex d IIC T5 Gb Ta. -50°C to +45°C
Ex d IIC T4 Gb Ta. -50°C to +70°C
Ex tb IIIC T90°C Db Ta. -50°C to +40°C
Ex tb IIIC T105°C Db Ta. -50°C to +55°C
Ex tb IIIC T120°C Db Ta. -50°C to +70°C
Certificate No. KEMA 00ATEX2006X
IECEx KEM 10.0002X
The units can be installed in locations with the following
conditions:
Area Classification Gas:
Zone 1
Explosive gas air mixture likely to occur in
normal operation.
Zone 2
Explosive gas atmosphere not likely to
occur in normal operation but may be
present for short periods.
Gas Groupings:
Group IIA
Propane
Group IIB
Ethylene
Group IIC
Hydrogen and Acetylene
Temperature Classification:
T1
450ºC
T2
300ºC
T3
200ºC
T4
135ºC
T5
100ºC (up to 45°C ambient)
Area Classification Dust:
Zone 21
Explosive dust air mixture likely to occur in
normal operation.
Zone 22
Explosive dust air mixture not likely to
occur in normal operation, and if it does, it
will only exist for a short time.
Dust Groupings:
Group IIIA
Combustible Dusts
Group IIIB
Non-Conductive Dust
Group IIIC
Conductive Dust
Maximum Surface Temperature for Dust Applications:
90ºC at +40 ºC ambient
105 ºC at +55 ºC ambient
120 ºC at +70 ºC ambient
IP Rating: IP66/67 to EN/IEC60529 and IP6X to
EN/IEC60079-0, EN/IEC60079-31
Equipment Category: 2G / 2D
Equipment Protection Level: Gb / Db
Ambient Temperature Range:
-50°C to +70°C Gas Groups IIA, IIB and IIC
-50°C to +70°C Dust Groups IIIA, IIIB and IIIC
SIL 2 Unit operating temperature range limits –25ºC to +60ºC
0518
II 2G
II 2D
Epsilon x
Equipment Group and
Category:
CE Marking
Notified Body No.
BExBG05D-P-SIL

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 2 of 17 (2)
3) Type Approval Standards
The beacon carries an EC Type Examination Certificate and
IECEx Certificate of Conformity, and have been certified to
comply with the following standards:
EN60079-0:2012+A11:2013 / IEC60079-0:2011 (Ed 6):
Explosive Atmospheres - Equipment. General requirements
EN60079-1:2007 / IEC60079-1:2007 (Ed 6):
Explosive Atmospheres - Equipment protection by flameproof
enclosures "d"
EN 60079-31:2014 / IEC60079-31:2013 (Ed 2):
Explosive Atmospheres - Equipment dust ignition protection
by enclosure "t"
4) Installation Requirements
The beacon must only be installed by suitably qualified
personnel in accordance with the latest issues of the relevant
standards:
EN60079-14 / IEC60079-14: Explosive atmospheres -
Electrical installations design, selection and erection
EN60079-10-1 / IEC60079-10-1: Explosive atmospheres -
Classification of areas. Explosive gas atmospheres
EN60079-10-2 / IEC60079-10-1: Explosive atmospheres -
Classification of areas. Explosive dust atmospheres
The installation of the beacon must also be in accordance
with any local codes that may apply and should only be
carried out by a competent electrical engineer who has the
necessary training.
5) Special Conditions of Use
Repair of the flamepath / flameproof joints is not permitted.
The enclosure is non-conducting and may generate an
ignition-capable level of electrostatic charges under certain
extreme conditions (such as high-pressure steam). The user
should ensure that the equipment is not installed in a location
where it may be subjected to external conditions that might
cause a build-up of electrostatic charges on non-conducting
surfaces.
Additionally, cleaning of the equipment should be done only
with a damp cloth.
6) Location and Mounting
The location of the beacon should be made with due regard
to the area over which the warning signal must be visible.
They should only be fixed to services that can carry the
weight of the unit.
The BEx beacon should be secured to any flat surface using
the three 7mm fixing holes on the stainless steel U shaped
mounting bracket. See Figure 1. The required angle can be
achieved by loosening the two large bracket screws in the
side of the unit, which allow adjustment of the beacon in
steps of 18°. On completion of the installation then two large
bracket adjustment screws on the side of the unit must be
fully tightened to ensure that the unit cannot move in service.
Fig. 1 Fixing Location for Beacon
7) Access to the Flameproof Enclosure
To access the Ex d chamber, remove the four M6 hexagon
socket head screws and withdraw the flameproof cover taking
extreme care not to damage the flameproof joints in the
process. M6 cover screws are Class A4-80 stainless steel
and only screws of this category can be used for the
enclosure.
Fig. 2 Accessing the Explosion proof Enclosure.
On completion of the installation, the flameproof joints should
be inspected to ensure that they are clean and that they have
not been damaged during installation.
Check that the earth bonding wire between the two castings
is secure and the ‘O’ ring seal is in place. When replacing the
flameproof cover casting ensure that it is square with the
flameproof chamber casting before inserting. Carefully push
the cover in place allowing time for the air to be expelled.
Only after the cover is fully in place should the four M6
Stainless Steel A4-80 cover bolts and their spring washer be
inserted and tightened down. If the cover jams while it is
being inserted, carefully remove it and try again. Never use
the cover bolts to force the cover into position.
Warning –Hot surfaces. External surfaces
and internal components may be hot after
operation, take care when handling the
equipment.
Warning –High voltage may be present,
risk of electric shock. DO NOT open when
energised, disconnect power before
opening.
(Appropriate cable glands
to be customer supplied)
Flameproof cover
M6 Cover
Screws
M6 Spring
Washer

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 3 of 17 (3)
8) Power Supply Selection
It is important that a suitable power supply is used to run the
equipment. The power supply selected must have the
necessary capacity to provide the input current to all of the
units.
The following table shows the input current taken by the
various beacons and shows the maximum voltage at which
the beacons can be operated:
The input current will vary according to the voltage input
level. The current levels shown above are for nominal input
voltage.
9) Selection of Cable, Cable Glands,
Blanking Elements & Adapters
When selecting the cable size, consideration must be given
to the input current that each unit draws (see table above),
the number of beacons on the line and the length of the cable
runs. The cable size selected must have the necessary
capacity to provide the input current to all of the beacons
connected to the line.
For ambient temperatures over +40ºC the cable entry
temperature may exceed +70ºC and therefore suitable heat
resisting cables and cable glands must be used, with a rated
service temperature of at least 110ºC
The dual cable gland entries have an M20 x 1.5 entry thread.
To maintain the ingress protection rating and mode of
protection, the cable entries must be fitted with suitably rated
ATEX / IECEx certified cable glands and/or suitably rated
ATEX / IECEx certified blanking devices during installation
according to EN / IEC60079-14.
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable glands
or blanking plugs.
For use in explosive dust atmospheres, a minimum ingress
protection rating of IP6X must be maintained.
The BEx beacon range can be supplied with the following
types of adapters:
M20 to ½” NPT
M20 to ¾” NPT
M20 to M25
It is important to note that stopping plugs cannot be fitted
onto adapters, only directly onto the M20 entries.
Any other adapters used must be suitably rated and ATEX /
IECEx certified adapters.
10) Earthing
Both AC and DC beacon units must be connected to an
earth. The units are provided with internal and external earth
terminals which are both located on the terminal chamber
section of the unit.
Fig. 3 Internal View of Cover
When using the internal earth terminal ensure that the
stainless steel M4 flat washer is between the incoming earth
wire and the enclosure.
Internal earthing connections should be made to the Internal
Earth terminal in the base of the housing using a ring crimp
terminal to secure the earth conductor under the earth clamp.
The earth conductor should be at least equal in size and
rating to the incoming power conductors.
External earthing connections should be made to the M5
earth stud, using a ring crimp terminal to secure the earth
conductor to the earth stud. The external earth conductor
should be at least 4mm² in size.
11) Cable Connections
Electrical connections are to be made into the terminal blocks
on the PCBA located in the flameproof enclosure. See
section 7 of this manual for access to the flameproof
enclosure. A four-way terminal block is provided on the
beacons. Therefore, there are two +ve terminals and two -ve
terminals for the input and output wiring.
Wires having a cross sectional area between 0.5 mm² to
2.5mm² can be connected to each terminal way. If an input
and output wire is required the 2-off Live/Neutral or +/-
terminals can be used. If fitting 2-off wires to one terminal
way the sum of the 2-off wires must be a maximum cross
sectional area of 2.5mm². Strip wires to 8mm. Wires may also
be fitted using ferrules. Terminal screws need to be tightened
down with a tightening torque of 0.45 Nm / 5 Lb-in. When
connecting wires to the terminals great care should be taken
to dress the wires so that when the cover is inserted into the
chamber the wires do not exert excess pressure on the
terminal blocks. This is particularly important when using
cables with large cross sectional areas such as 2.5mm².
Model No.
Nominal I/P
Voltage
Input
Current
Voltage
Range
BExBG05D-P-SIL
24Vdc
325mA
20-28V
External Earthing
Internal
Earthing
Internal
Bonding
Wire
Terminal
2-off M20
Cable
Entries

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 4 of 17 (4)
12) SIL 2 Instruction/Safety Manual
Fig 4 - The SIL 2 Module monitors the Beacon and interfaces to the customer plant.
Warning –To maintain the integrity of the SIL 2 units the system must be installed in accordance with this manual. Any
deviation could result in failure of the SIL 2 system and an unintended unit operation or function.
Warning –Unit must be installed, commissioned and used within the parameters outlined in this manual. Failure to comply
with this will result in potential unit failure within the system.
Warning –The unit must be powered in either Standby or Active modes to comply with the SIL 2 approval requirement.
Warning –If the power is disrupted the unit must be allowed to go through the commissioning cycle to reset, if this does not
happen and the power continues to be disrupted the unit will latch the fault and require a hard system reset.
SIL 2 System Description
The E2S BEx range of IECEx & ATEX compliant signaling
devices with integrated SIL 2 fault monitoring modules.
The SIL 2 module monitors the function of the device and
provides feedback to the control panel. A fault condition can
be communicated via independent fault contacts or by the
introduction to the monitoring circuit of an end of line resistor.
A SIL 2 system wiring for fault detection in standby and active
mode –4 wire installation can be seen as per section 14.1. A
SIL 2 system wiring for fault detection in standby and active
mode –2 wire installation can be seen as per section 14.2.
The new SIL 2 version of the E2S BExS110-SIL & BExS120-
SIL alarm horn sounder and BExBG05-P-SIL, BExBG10-P-
SIL & BExBG15-P-SIL Xenon strobe beacon are designed,
tested and certified, bringing plant safety to new levels.
Key benefits:
•Signaling device function is checked and
automatically reported to the control panel.
•Eliminates the need for time consuming physical
inspections.
•Increased plant safety, confidence that all devices
are fully functioning.
•Designed to integrate seamlessly into your SIL 2
environment.
13) SIL 2 System Terms and Function
The SIL 2 Beacon Unit Monitors
•Standby mode and Active mode
•Health status of power supply
•Beacons correct function and flash pattern
The SIL 2 beacon operates as part of a SIL 2 system.
The beacon will after commissioning remain powered in
Standby mode (reverse polarity) until the beacon is required
to operate. When the signaling device is required to operate
beacon the polarity is changed back to normal supply and the
beacon will go into Active mode where it will start to
function/flash. When testing the system and beacons
operation, the system is put into Active mode.
The customer PLC will control whether the system is in either
of the main two operational modes.
Standby Mode –This is where the power supply polarity is
reversed so negative (–ve) is feed to the positive (+) beacon
terminal and positive (+) is feed to the negative (–ve) beacon
terminal.
In this mode the beacon will not flash but the SIL 2 unit is
monitoring power supply and is set-up ready to go to Active
(alarm) mode.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 5 of 17 (5)
Power relay RLY1-1 will be open whilst SIL 2 relay RLY1-2
will be closed contact between terminals 1 & 2.
If power is disrupted the SIL 2 unit will go into Fault mode, in
fault mode the Power relay RLY1-1 will close whilst SIL 2
relay RLY1-2 will become open circuit between terminals 1 &
2.
Active Mode –This is where the power is in normal polarity,
positive (+) supplied to the positive (+) beacon terminal and
negative (–ve) is supplied to the negative (–ve) beacon
terminal.
In this mode the beacon will flash giving the warning signal,
the SIL 2 unit is actively checking the beacons function for
flash output and beacon controller signal generation to the
right flash frequency.
Power relay RLY1-1 will be open whilst SIL 2 relay RLY1-2
will be closed contact between terminals 1 & 2.
The SIL 2 unit will also check for signal polarity.
If a fault is found the SIL 2 unit will go into Fault mode.
If power is disrupted the SIL 2 unit will go into Fault mode, in
fault mode the Power relay RLY1-1 will close whilst SIL 2
relay RLY1-2 will become open be circuit between terminals
1 & 2.
Fault modes - The fault modes listed 13-1 & 13-2 below will
make the SIL 2 unit change the state of the fault relays
In fault mode the Power relay RLY1-1 will close whilst SIL 2
relay RLY1-2 will become open be circuit between terminals
1 & 2.
13-1 Beacon Failure
•Flash Failure –No Flash detected
•Beacon Controller failure –No flash trigger pulse
detected
•Flash Rate Failure –Regular 1 Hz flash cycle erratic
Resetting Failure - It is possible that the SIL 2 unit can be
reset by powering the unit off for a period greater than 20
seconds. On restarting the unit and running through the
commissioning cycle, the fault may clear. It is necessary to
run the test function cycle again to see if the fault is still
evident. If the relays activate again the unit must be checked
as it is showing a failure and may not be functioning correctly.
13-2 Power Failure / SIL 2 Failure
•SIL 2 Controller failure –Internal function and
system checking flags fault
•Rapid Power cycling –System indicates power
instability
•Total Power Failure
Resetting Failure - It is possible that the SIL 2 unit can be
reset by hard resetting the unit using the reset jumper within
the unit (see section 21) on hard resetting.
On restarting the unit and running through the commissioning
cycle, the fault may clear. It is necessary to run the test
function cycle again to see if the fault is still evident. If the
relays activate again the unit must be checked as it is
currently showing a failure and may not be functioning
correctly.
Commissioning System - Functional start-up of System
(Normally in reverse polarity mode)
When Commissioning system the power must not be
disrupted to the SIL 2 Unit within the unit’s initialization cycle
which is 5 seconds.
Once past this period the SIL 2 system is fully operational
and will be in monitoring the beacon and power in Standby
mode.
The relay RLY1-2 on the SIL 2 unit will only remain open for a
maximum of 1 second on commissioning start-up.
Then they will close contact 1 & 2 showing healthy operation
and only open in the event of a fault or power down.
System Testing (Active Mode normal polarity)
The SIL 2 system will remain monitoring the power in standby
mode until the polarity is changed to normal mode to enable
an active system for beacon functional testing.
Important: - The polarity must be held in active mode for a
period in excess of 15 seconds to ensure a full system check
is performed.
Whilst the system is being checked the beacon controller and
flash pulses are monitored and checked for correct pattern
timing.
Once the test period has been completed the unit can be
switched back to standby mode by reversing the polarity.
If no faults have been found during the test the relays will
remain in there steady state.
The SIL 2 unit will continue to monitor the power and mode.
Important: - The automated test cycle must be
undertaken on at least a weekly basis to maintain the SIL 2
units reliability.
System Activation (Active Mode normal polarity)
The SIL 2 system will remain monitoring the power in standby
mode until the polarity is changed to Active mode to enable
an active system for beacon to function as a warning
signaling device.
Important :- The polarity must be held in active mode for a
period in excess of 15 seconds to ensure a full system check
is performed whilst in alarm mode, although it is expected
that during a system activation this period will be significantly
greater.
Note :- The fault indication signal on TB1 can take up to 1.5
seconds to indicate system fault.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 6 of 17 (6)
14) SIL 2 Wiring configuration and Beacon set-up
Figure 5 –Terminals and header pins for beacon
•14-1 SIL 2 system wiring for fault detection in standby and active mode –4 wire
installation (Recommended)
The customer is required to wire into both the beacon power supply terminals and also the SIL 2 Relay terminals TB1
The power supply terminals only need to have the supply power connected. This will be reverse polarity for monitoring mode
and normal polarity for active mode. There is no need to fit an EOL resistor on the power supply terminal as the TB1 is
configured to raise a fault alarm in any situation.
TB1 the SIL 2 monitoring relay, RLY 1-2 on the SIL 2 board which whilst powered is closed between TB1 terminals 1 & 2,
however on any fault will become an open circuit between TB1 terminals 1 & 2.
The fault will be seen via the SIL 2 TB1 terminals as soon as the fault occurs in either Active or Standby modes.
As factory default when there is no fault, the TB1 terminals 1 & 2 will be closed putting a 3.3kΩ current sense resistor in line.
If the circuit is driven with 24V dc the detection current seen is ~7.3mA @ 24V.
System faults will make RLY 1-2 contacts go open circuit between terminals 1 & 2 for any fault mode.
The only other fault mode is if the cable goes short circuit where a short will be seen by the panel.
There is an option (although not recommended) to alter the enable J1 header pin to link pins 1 & 2 (see figure 8) which shorts
out the 3.3KΩ current sense resistor making TB1 terminal 1 & 2 into a switch. The disadvantage is that a short circuit on this
cable will not be detected
Figure 6 –Schematic of SIL 2 system wiring for fault detection in standby and active mode –4 wire installation
Beacon power
supply terminal
block
Current
drawn (mA)
Active Mode
190mA
Standby Mode
25mA
TB1 Current
Sense Resistor
value
Current
drawn
(mA)
3.3kΩ
7.2mA
On fault mode, current drops
to 0 as circuit goes open.
For one unit only:
3 2 1
--+ +
Beacon Power Supply
Terminals
Flip / Flop
Pin Header
(Section 19)
SIL Relay Terminals TB1
J1 Header –Shown in
factory default position A
(see section 18.3), places
TB1 Current sense
resistor in circuit
J2 Header –Shown in
factory default position A
(see section 14.3) removes
power supply terminal
block Fault resistor out of
circuit.
J7 Header –Shown in
factory default position A
(see section 17), set to
Normal operation

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 7 of 17 (7)
Multiple Unit Configuration
When multiple units are used in the system, the following considerations are to be made by the customer:
1. Customer panel capabilities -
The customer is required to identify the minimum change in current the panel can detect (Panel resolution). This will
therefore determine what resistors values to pick in section 3 below.
2. Topology -
The customer has a number of options on how to set up the system.
▪A single unit topology is where only one unit is connected to the customer interface line, as shown in figure 6.
▪A series topology is where each unit is connected to one another as shown in Figure 14.
▪A star topology is where each unit is connected to a central source as shown in Figure 15.
3. Resistor - TB1 Current Sense Resistor (default 3.3kΩ)
The customer is required to calculate the total resistance of the system, to determine the change in current when a
fault occurs. The default customer sense resistor value is 3.3kΩ. Examples of calculations of resistance for steady
mode and fault mode are shown in table 1.
Panel
Resolution
Topology
Resistor:
TB1 CSR
No. of
Units
Steady Mode:
Active/Monitoring
Fault Mode
1 unit fault
All units fault
2mA
Series
3.3kΩ
3
3 x 3.3kΩ = 9.9kΩ
0mA
If one unit fails the
whole system fails
7mA
Star
3.3kΩ
3
(3.3kΩ ~ 7.3mA)
3 x 7.3mA = 21.9mA
(Fault unit):
1 x 0mA = 0mA
(Normal):
2 x 7.3mA = 14.6mA
(Fault unit):
3 x 0mA = 0mA
1.5mA
Series
3.3kΩ
4
4 x 3.3kΩ = 13.2kΩ
0mA
If one unit fails the
whole system fails
7mA
Star
3.3kΩ
4
(3.3kΩ ~ 7.3mA)
4 x 7.3mA = 29.2mA
(Fault unit):
1 x 0mA = 0mA
(Normal):
3 x 7.3mA = 21.9mA
(Fault unit):
4 x 0mA = 0mA
Table 1
Note: - Cable fault
•Between the panel and the first unit, a cable short, increases the current (presenting a short circuit to the panel), and a
cable cut/open reduces current (presenting an open circuit to the panel).
•In series topology a cable short between units will short out one of the current sense resistors which results in an increase
in the current used by the unit, and a cable cut/open reduces current (presenting an open circuit to the panel).
•In star topology a cable short between units will short circuit the SIL 2 monitoring line hence presenting a short circuit to the
panel, an open circuit fault on one of the units will effectively remove one of the current sense resistors reducing total
effective resistance hence decreasing the total current seen by the panel.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 8 of 17 (8)
•14-2 SIL 2 system wiring for fault detection in standby mode only –2 wire installation
The customer is required to wire into power supply terminal only. The unit will be monitored in standby mode only, via an
customer installed system EOL resistor (2.2kΩ suggested customer EOL and default 2.2kΩ fault resistor will draw a total current
of 35.9mA @ 24Vdc as shown in table 2).
In the event of a fault, The SIL 2 unit will automatically place the power supply terminal fault resistor across the power terminals
which already has customer EOL resistor (2.2kΩ) in place. This will result in a total fault detection current of 41.8mA @ 24V but
can only be detected when unit is in Standby Mode.
If the customer chooses to use this configuration within their system, it must be noted that the factory default settings for the unit
does not have an EOL resistor installed. The customer can request E2S to install an EOL resistor and this will be depicted in the
product code. See section 25 for further information on EOL and fault resistor value choice.
Important: - This configuration will not warn of a fault whilst in Active mode as the PLC will be supplying the unit with power.
The PLC will only be able to see the fault when in standby mode, by measuring the fault detection current.
Important: - This configuration requires the customer to set J2 header pin to be set to position B (see figure 9), as the units
default position is A.
Figure 7 - Schematic of SIL 2 system wiring for fault detection in standby mode only –2 wire installation
To evaluate the total current drawn from the SIL 2 unit, use the equation below.
In standby mode, where there is no fault, RLY 1-1 is open. This means the voltage only passes through the customer EOL
resistor and the current drawn from the SIL 2 board is 25mA. Therefore, the equation for a No Fault scenario is then:
In standby mode, where there is a fault, the circuit is closed. This means the voltage passes through both the customer EOL
resistor and current sense resistor and the current drawn from the SIL 2 board is 20mA. The customer must first calculate the
resistance of the two resistors in parallel before applying the currents to the equation. The equation for a Fault scenario is then:
I
(Total Current
drawn)
=
(Current drawn from
Fault Resistor)
+
(Current drawn from
Customer EOL resistor)
+
(Current drawn
from SIL board)
(Standby Mode, Total Current drawn - No Fault)
=
(0mA)
+
(See table 2)
+
(25mA)
(Standby Mode, Total Current drawn - Fault)
=
(Total Resistance when EOL & FR in parallel)
+
(20mA)
Standby
Mode
Power Supply Fault Resistor
Customer EOL Resistor
(Fault Mode Only)
Current
drawn
from SIL
Board
Total
current
drawn
Resistor
Value
Current
drawn ( )
Resistor
Value
Current
drawn ( )
Total
resistance
Current
drawn ( )
No Fault
2.2 kΩ
0 mA
2.2 kΩ
10.9 mA
-
-
25 mA
35.9 mA
Fault
-
-
1.1 kΩ
21.8 mA
20 mA
41.8 mA
No Fault
1.0 kΩ
0 mA
1.0 kΩ
24.0 mA
-
-
25 mA
49.0 mA
Fault
-
-
500 Ω
48.0 mA
20 mA
68.0 mA
No Fault
2.2 kΩ
0 mA
3.3 kΩ
7.3 mA
-
-
25 mA
32.3 mA
Fault
-
-
1.3 kΩ
18.2 mA
20 mA
38.2 mA
No Fault
1.8 kΩ
0 mA
3.9 kΩ
6.2 mA
25 mA
31.2 mA
Fault
-
-
1.2 kΩ
19.5 mA
20 mA
39.5 mA
No Fault
1.8 kΩ
0 mA
4.7 kΩ
5.1 mA
-
-
25 mA
30.1 mA
Fault
-
-
1.3 kΩ
18.4 mA
20 mA
38.4 mA
No Fault
2.2 kΩ
0 mA
4.7 kΩ
5.1 mA
-
-
25 mA
30.1 mA
Fault
-
-
1.5 kΩ
16.0 mA
20 mA
36.0 mA
Table 2: Resistor combinations and the currents drawn when no faults and faults occur

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 9 of 17 (9)
Multiple Unit Configuration
When multiple units are used in the system, the following considerations are to be made by the customer:
1. Customer panel capabilities -
The customer is required to identify the minimum change in current the panel can detect (Panel resolution). This will
therefore determine what resistors values to pick in section 3 below.
2. Topology -
The customer has a number of options on how to set up the system.
▪A single unit topology is where only one unit is connected to the customer interface line, as shown in figure 7.
▪A series topology is when each unit is connected to one another as shown in figure 16.
▪A star topology is when each unit is connected to a central source as shown in figure 17.
3. Resistor -
The customer is required to calculate the total resistance a system, to determine the change in current when a fault
occurs. As mentioned above, the customer can select a system EOL resistor. The default fault resistor value is 2.2kΩ
which is recommended and is fitted according to the configuration topology chosen.
Panel
Resolution
Topology
Resistor:
Power Supply
FR & EOL
No. of
Units
Steady Mode
Active/
Monitoring
Fault Mode
1 unit fault
2 units fault
All units fault
5.5mA
Series
FR = 2.2kΩ
&
EOL = 2.2kΩ
3
EOL Only
EOL + FR
EOL + (2 x FR)
EOL + (3 x FR)
5.5mA
Star
FR = 2.2kΩ
&
EOL = 2.2kΩ
3
3 x EOL
(3 x EOL) + (1 x FR)
(3 x EOL) + (2 x FR)
(3 x EOL) + (3 x FR)
5.5mA
Series
FR = 2.2kΩ
&
EOL = 3.3kΩ
3
EOL Only
EOL + FR
EOL + (2 x FR)
EOL + (3 x FR)
5.5mA
Star
FR = 2.2kΩ
&
EOL = 3.3kΩ
3
3 x EOL
(3 x EOL) + (1 x FR)
(3 x EOL) + (2 x FR)
(3 x EOL) + (3 x FR)
Table 3
Note: - Cable fault
•Between the panel and the first unit, a cable short, increases the current (presenting a short circuit to the panel), and a
cable cut/open reduces current (presenting an open circuit to the panel).
•In series topology a cable short between units will short out one of the current sense resistors which results in an increase
in the current used by the unit, and a cable cut/open reduces current (presenting an open circuit to the panel).
•In star topology a cable short between units will short circuit the SIL 2 monitoring line hence presenting a short circuit to the
panel, an open circuit fault on one of the units will effectively remove one of the current sense resistors reducing total
effective resistance hence decreasing the total current seen by the panel.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 10 of 17 (10)
•14-3 Header Pins Settings
Figure 8: J1 Header settings
Figure 9: J2 Header settings
J1 Header Pin - Postion A, Factory default position
(pins 1 & 2 not linked) places TB1 Current sense
resistor in circuit.
J1 Header Pin - Postion B (pins 1 & 2 linked)
removes TB1 Current sense resistor out of circuit.
J2 Header Pin - Postion A, Factory default position
(pins 1 & 2 linked) removes power supply TB Fault
resistor & RLY 1-2 out of circuit.
J2 Header Pin - Postion B (pins 2 & 3 linked)
places power supply TB Fault resistor & RLY 1-2
in circuit.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 11 of 17 (11)
15) SIL Specific Unit Mounting
Requirements
The beacon should be mounted no closer that 2m from a
beacon or light source of similar candela output. This is to
ensure false light activation does not occur when the unit is
monitoring the light pulse duration and flash failure.
16) SIL 2 Reliability Data
Reliability and Functional safety IEC/EN61508 which has
been assessed and is considered suitable for use in low
demand safety function:
•Random Hardware Failures and Architectural constraints
(route 1H)
•As an unvoted item (i.e. hardware fault tolerance of 0) at
SIL 2
The product was assessed against failure modes:
•Failure respond to an input by lighting a beacon
•Spurious light output despite no input
Integrity in respect of
failure to release
SIL 2
Total Failure rate
0.37 pmh
“hazardous” failure rate
(revealed)
0.297 pmh
“hazardous” failure rate
(unrevealed)
0.003 pmh
“safe” failure rate
(revealed)
0.006 pmh
“safe” failure rate
(unrevealed)
0
Diagnostic Coverage
99%
System type
B
Hardware Fault Tolerance
0
Safe Failure Fraction
>99%
PFD (hazardous failure)
3.8 x 10-5
Proof Test Interval
Up to 1 year
The SIL 2 units life is dependent on the cumulative running
hour of the unit. The maximum running duration is 2,500
hours.
17) Synchronised Operation
All BExBG05D-SIL beacons that are connected to the same
supply line will have a synchronised flash rate at one flash
every second. To ensure that the units will be synchronised
check that the pin header is not fitted, i.e. the two header pins
are not shorted together (see Figure 5).
18) Flip-Flop Operation
Two beacons can be mounted close to each other to form a
flip-flop operation, where the beacons will flash alternately.
To achieve this mode of operation, fit a pin header to the flip-
flop header pins on the electronics board, i.e. the two header
pins are shorted together, (see figure 5) on one of the two
beacons. The first flash on the beacon that has the header
fitted will be delayed by ½ second. The two beacons will then
flash alternately every ½ a second.
19) End of Line Monitoring
On the BExBG05D-SIL beacon, DC reverse line monitoring
can be used if required. All DC beacons have a blocking
diode fitted in their supply input lines. An end of line
monitoring diode or an end of line monitoring resistor can be
connected across the +ve and –ve terminals.
We suggest that with the SIL system the customer selected
EOL resistor is kept to a value of 2.2kΩhowever variation is
allowed as required by the SIL systems PLC parameters. See
section 14.2 and 22.
Values of current draw are given for the 2.2kΩresistor if used
as set up in section 14.
If an alternative value end of line resistor is used it must have
a minimum resistance value of 3.3kΩand a minimum
wattage of 0.5 watts or a minimum resistance value of 500Ω
and a minimum wattage of 2 watts.
20) SIL 2 Hard Reset
If required to hard system reset the unit, firstly, the unit will
need to be opened, to carry out this operation see section 7.
Warning: - Ensure that an explosive atmosphere is not
present during reset operation.
Power down the unit completely for a minimum of 30
seconds. Move the hard reset header pin (Jumper J7) to
reset position shown. Then power the unit for a minimum of 5
seconds. Power down the unit for 30 seconds and then move
the header pin back to the Normal Position.
The unit has been reset. Close the unit as noted in section 7.
If the hard reset does not correct the fault the unit or power
supply integrity will need further investigation.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 12 of 17 (12)
J7 Header Pin - Postion A, Factory default
position (pins 2 & 3 linked) set to normal
operation.
J7 Header Pin - Postion B (pins 2 & 3
linked) set for hard reset.
Fig 10 –Jumper Settings
21) Product Coding for Fault Resistor and
Customer EOL Resistor
The customer is able to identify the resistor values chosen on
purchase from the product code. This is represented by the
last two characters:
BEXBG05D24DC-P-SIL-XX
The first character denotes the value of the Fault resistor and
the second character denotes the value of the EOL resistor.
The values of resistors available are shown in table 4.
Code
Resistor Value
A
2.2 kΩ
B
1.0 kΩ
C
1.5 kΩ
D
1.8 kΩ
E
2.7 kΩ
F
3.3 kΩ
G
3.9 kΩ
H
4.7 kΩ
J
5.6 kΩ
K
6.8 kΩ
L
8.2 kΩ
M
11 kΩ
Z
None Fitted
Table 4: Resistor values
For Example:
BEXBG05D24DC-AM-P-SIL-AZ
This shows a standard 5J 24V dc amber beacon with the
suggested 2.2kΩ fault resistor and no customer installed or
selectable EOL resistor.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 13 of 17 (13)
22) Interchangeable & Spare Parts
The beacon cover is interchangeable, contact E2S Ltd for a
replacement cover available in various colours.
To change the cover, unscrew the M5 socket head screws
and remove the M5 screws, M5 spring & flat washers.
Fig. 11 Removal of cover
Remove the guard and replace the old cover with the new
cover.
Fig. 12 Changing of cover
Fit the guard back on to the cover and casting, align the
holes of the guard, cover and casting. To reattach the cover,
the fixings MUST be in the order shown in figure 12.
Fig. 13 Cover and Guard Fixtures
23) Maintenance, Overhaul & Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
EN60079-19
IEC60079-19
Explosive atmospheres - Equipment repair,
overhaul and reclamation
EN 60079-17
IEC60079-17
Explosive atmospheres - Electrical
installations inspection and maintenance
To avoid a possible ELECTROSTACTIC CHARGE the unit
must only be cleaned with a damp cloth.
Units must not be opened while an explosive atmosphere is
present.
If opening the unit during maintenance operations a clean
environment must be maintained and any dust layer removed
prior to opening the unit.
Flameproof threaded joints and cemented joints are not
intended to be repaired.
Warning –Hot surfaces. External surfaces
and internal components may be hot after
operation, take care when handling the
equipment.
M5x16 Hex Socket Screw
M5 Spring Washer
M5 Plain Washer
Guard
Cover
M5x16 Hex
Socket Screw
Old
Cover
New
Cover

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 14 of 17 (14)
Figure 14: Schematic of SIL 2 system wiring for fault detection in standby mode only –4 wire installation configuration wired in
series

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 15 of 17 (15)
Figure 15: Schematic of SIL 2 system wiring for fault detection in standby mode only –4 wire installation configuration in Star
formation

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 16 of 17 (16)
Figure 16: Schematic of SIL 2 system wiring for fault detection in standby mode only –2 wire installation configuration wired in
series

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e-2-s.com Fax: [phone]
Document No. D197-00-102-IS Issue B 16-06-17 Sheet 17 of 17 (17)
Figure 17: Schematic of SIL 2 system wiring for fault detection in standby mode only –2 wire installation configuration in star
formation

E2S Telephone: [phone] Fax: [phone] Email: [email protected] www.e2s.com DC-0 5_Issue_D (BExBG SIL2) - Page 1 of 1 - QAF_252_Issue_5
Martin Streetz Document No.: DC-0 5_Issue_D
Quality Assurance Manager Date and Place of Issue: London, 08/09/201
EU Declaration of Conformity
Manufacturer: European Safety Systems Ltd.
Impress House, Mansell Road, Acton
London, W3 7QH, United Kingdom
Equipment Type: BExBG05D-SIL, BExBG10D-SIL, BExBG15D-SIL
BExBG05D-P-SIL, BExBG10D-P-SIL, BExBG15D-P-SIL
Directive 2014/34/EU: Equipment and Protective Systems for use in Potentially Explosive Atmospheres (ATEX)
Notified Body for EU type Examination (Module B): Dekra Certification B.V.
Notified Body No.: 0344
Meander 1051, 6825 MJ Arnhem, The Netherlands
EU-type Examination Certificate (Module B): KEMA 00ATEX2006X
Notified Body for Quality Assurance Notification / Conformity to
EU-type based on
quality assurance of the production process (Module D):
Sira Certification Service
Notified Body No.: 0518
Rake Lane, Eccleston, Chester CH4 9JN, UK
Quality Assurance Notification (Module D): SIRA 05 ATEX M342
Provisions fulfilled by the equipment: II 2G Ex d llC T4 to T6 Gb
II 2D Ex tb IIIC T85°C to T125°C Db
IP6X Dust Protection to EN60079-0 / EN60079-31
Standards applied: EN 60079-0:2012 + A11:2013
EN 60079-1:2007
EN 60079-31:2014
Directive 2014/30/EU: Electromagnetic Compatibility Directive (EMC)
Standards applied: EN 61000-6-1:2007
EN 61000-6-2:2005
EN 61000-6-3:2007 / A1:2011 / AC: 2012
EN 61000-6-4:2007 / A1: 2011
Directive 2011/65/EU: Restriction of the use of certain hazardous substances in electrical and electronic equipment (RoHS)
The product and all the components contained within it are in accordance with the restriction of the use of hazardous substances in electrical and
electronic equipment.
Regulation (EC) 1907/2006: Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH)
The product and all the components contained within it are free from substances of very high concern.
Other Standards and Regulations
Safety Integrity Level: suitable for SIL2 (for product software and hardware)
System Capability: suitable for SC=2 (for product software and hardware)
System Capability assessment: 1s (by cross-functional team assessment)
IEC 61508-1 (2010) Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements
IEC 61508-2 (2010) Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 2: Requirements for
electrical/electronic/programmable electronic safety-related systems
IEC 61508-3 (2010) Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3: Software requirements
EN 60529:1991 + A1:200 + A2:2013 - Degrees of protection provided by enclosures (IP code) – enclosure rated IP66/67
On behalf of European Safety Systems Ltd., I declare that, on the date the equipment accompanied by this declaration is placed on the market, the
equipment conforms with all technical and regulatory requirements of the above listed directives, regulations and standards.
This Declaration is issued under the sole responsibility of the manufacturer.