E2S STExB2X05-S Series User manual

INSTRUCTION MANUAL
STExB2X05-S, STExB2X10-S & STExB2X15-S
Flameproof Xenon Beacons –SIL2
For use in Flammable Gas and Dust Atmospheres
E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 1 of 15
STExB2X05-S
STExB2X10-S
STExB2X15-S
1) Product Table
Ensure the system power supply is capable of providing the maximum current required for all beacons. Review associated cable size,
length and quantity of beacons on each circuit.
Standard
Model Number
Nom.
Voltage
Voltage Range
Nom.
Operating
Current*
Max Current
ATEX /
IECEx /
UKEx /
NEC /
CEC
STExB2X05DC024-S
24Vdc
20-28Vdc
295mA
350mA
STExB2X10DC024-S
24Vdc
20-28Vdc
605mA
710mA
ATEX /
IECEx /
UKEx
STExB2X15DC024-S
24Vdc
20-28Vdc
835mA
920mA
*Rate at 1Hz
The table shows the input current taken by the various beacons.
Nominal current at nominal voltage and 1Hz flash rate.
Max. rated current at worst case supply voltage and flash rate.
Table 1: Electrical Ratings.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
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Document No. D199-00-621-IS
Issue 2
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Sheet 2 of 15
2) Warnings
•DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE IS
PRESENT.
•POTENTIAL ELECTROSTATIC CHARGING HAZARD –
CLEAN ONLY WITH A DAMP CLOTH.
•ALL ENTRIES M20 X 1.5MM.
•USE SUITABLE RATED CABLES AND CABLE GLANDS
IF TEMPERATURE EXCEEDS AS PER STANDARDS
INDICATIONS BELOW.
FOR ATEX / IECEx & UKEx STANDARDS:
70ºC AT ENTRY OR 80ºC AT BRANCHING POINT.
FOR NEC / CEC STANDARDS:
60ºC AT ENTRY OR 60ºC AT BRANCHING POINT.
3) Marking & Rating Information
All units have a rating label, which carries the following
important information:
•Unit Model.
•Voltage Range
•Nominal Voltage
•Max. Current
See Table 1 for electrical ratings of each Unit Model.
3.1. ATEX / IECEx & UKEx Ratings
Standards
EN IEC 60079-0:2018 / IEC60079-0:2017 (Ed 7):
Explosive Atmospheres - Equipment. General Requirements
EN60079-1:2014 / IEC60079-1:2014 (Ed 7):
Explosive Atmospheres - Equipment Protection by Flameproof
Enclosures "d"
BS EN 60079-31:2014 / IEC 60079-31:2013 (Ed 2):
Explosive Atmospheres - Equipment Dust Ignition Protection by
Enclosure "t"
Ratings
STExB2X05
DC024-S
Ex db IIC T5 Gb Ta -50°C to +70°C
Ex db IIC T6 Gb Ta -50°C to +55°C
Ex tb IIIC T92°C Db Ta -50°C to +70°C
STExB2X10
DC024-S
Ex db IIC T4 Gb Ta -50°C to +70°C
Ex db IIC T5 Gb Ta -50°C to +45°C
Ex tb IIIC T118°C Db Ta -50°C to +70°C
STExB2X15
DC024-S
Ex db IIC T4 Gb Ta -50°C to +70°C
Ex tb IIIC T127°C Db Ta -55°C to +70°C
Certificate No.
DEMKO 16 ATEX1466X
IECEx ULD 16.0017X
UL21UKEX2019X
ATEX Mark, Equipment
Group and Category:
II 2G
II 2D
CE Marking and
Notified Body No.
2813
UKCA Marking and
Notified Body No.
0518
3.2. NEC / CEC Ratings
All models are approved for use as Visual Signal Device for
use as General Signalling:
UL1638A & CSA C22.2 No 205-17
NEC Class / Zone Ratings US Codes
Standards
UL 60079-0 (Ed. 7) 04/15/2020
Explosive Atmospheres - part 0: Equipment - General
Requirements
UL 60079-1 (Ed. 7) 2015
Explosive Atmospheres - Part 1: Equipment Protection by
Flameproof Enclosures 'd'
Ratings
STExB2X05
DC024-S
Class I Zone 1 AEx db IIC T5 Gb Ta -50°C to +70°C
Class I Zone 1 AEx db IIC T6 Gb Ta -50°C to +55°C
STExB2X10
DC024-S
Class I Zone 1 AEx db IIC T4 Gb Ta -50°C to +70°C
Class I Zone 1 AEx db IIC T5 Gb Ta -50°C to +45°C
Installation must be carried out in compliance with the National
Electric Code.
CEC Class / Zone Ratings Canada
Standards
CAN/CSA C22.2 No. 60079-0 (Ed. 4) 02/2019
Explosive Atmospheres - Part 0: Equipment - General
Requirements
CAN/CSA C22.2 No. 60079-1 (Ed. 3) 2016
Electrical Apparatus for Explosive Gas Atmospheres - Part 1:
Flameproof Enclosures 'd'
Rating
STExB2X05
DC024-S
Ex db IIC T5 Gb Ta -50°C to +70°C
Ex db IIC T6 Gb Ta -50°C to +55°C
STExB2X10
DC024-S
Ex db IIC T4 Gb Ta -50°C to +70°C
Ex db IIC T5 Gb Ta -50°C to +45°C
Installation must be carried out in compliance with the
Canadian Electric Code.
NEC & CEC Class / Division Ratings for US / Canada,
USL CNL
Standards
STExB2X
Xenon
beacons
UL1638A (Ed. 1) 2016
Standard for Visual Signal Appliances for General
Signalling Use
CSA C22.2 No. 205-17 (Ed. 3) 2017
Signal Equipment
Ratings
STExB2X05
DC024-S
Class I Div 2 Group ABCD T5 Ta -50°C to +70°C
Class I Div 2 Group ABCD T6 Ta -50°C to +55°C
STExB2X10
DC024-S
Class I Div 2 Group ABCD T4 Ta -50°C to +70°C
Class I Div 2 Group ABCD T5 Ta -50°C to +45°C

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 3 of 15
The certification approval has validated continuous use up to
38°C ambient and are for transient use up to 70°C ambient.
Installation must be carried out in compliance with the National
Electric Code / Canadian Electric Code.
4) Zones, Gas Group, Category and
Temperature Classification
The units can be installed in locations with the following
conditions:
Area Classification
Zone 1
Explosive gas air mixture likely to occur in
normal operation.
Zone 2
Explosive gas air mixture not likely to occur in
normal operation, and if it does, it will only exist
for a short time.
Zone 21
(ATEX / IECEx & UKEx
only)
Explosive dust air mixture likely to occur in
normal operation.
Zone 22
(ATEX / IECEx & UKEx
only)
Explosive dust air mixture not likely to occur in
normal operation, and if it does, it will only exist
for a short time.
Gas Groupings
Group IIA
Propane
Group IIB
Ethylene
Group IIC
Hydrogen and Acetylene
Temperature Classification for Gas Applications
T1
450ºC
T2
300ºC
T3
200ºC
T4
135ºC
(STExB2X10DC & STExB2X15DC up to 70°C
ambient)
T5
100ºC
(STExB2X05DC up to 70°C ambient;
STExB2X10DC up to 45°C ambient)
T6
85ºC
ATEX / IECEx / UKEx:
(STExB2X05DC up to 55°C ambient)
NEC / CEC:
Up to 65°C ambient
Dust Groupings
(ATEX / IECEx & UKEx only)
Group IIIA
Combustible Flyings
Group IIIB
Non-conductive Dust
Group IIIC
Conductive Dust
Maximum Surface Temperature for Dust Applications
(ATEX / IECEx & UKEx only)
STExB2X05DC-S
92ºC
STExB2X10DC-S
118ºC
STExB2X15DC-S
127 ºC
Equipment Category
2G / 2D
Equipment Level Protection
Gb, Gc, Db, Dc
Ambient Temperature Range
-50°C to +70°C
IP Rating
IP6X to EN/IEC60079-0
IP66 to EN60529
5) Special Conditions for Safe Use
Repair of the flameproof threaded joints and cemented joints
is not permitted.
Figure 1: Flame Path.
The metallic enclosure has a non-conductive coating. These
may generate an ignition-capable level of electrostatic charges
under certain extreme conditions. 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.
All entries must be fitted with a suitable seal at the interface
with enclosure.
6) Product Mounting and Access
6.1. Location and Mounting
The location of the beacons 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 STEx beacons should be securely bolted to a flat surface
using 9.0mm diameter bolt holes in the base of the unit. See
figure 2.
Figure 2: Fixing Location for B2 Beacon.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
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Sheet 4 of 15
6.2. Access to the Flameproof Enclosure
Warning –Hot surfaces. External
surfaces and internal components
may be hot after operation, take
care when handling the equipment.
In order to connect the electrical supply cables to the beacon
it is necessary to remove the flameproof cover to gain access
to the flameproof chamber. To access the Ex d chamber,
loosen the M4 grub screw on the beacon cover. Open the
enclosure by turning the beacon cover counterclockwise and
remove the cover, taking extreme care not to damage the
flameproof threads in the process (See figure 3).
Figure 3: Accessing the Explosion Proof Enclosure.
On completion of the installation, the flameproof threaded joint
should be inspected to ensure that they are clean and that they
have not been damaged during installation.
Repair of the flame path / flameproof joints is not permitted.
Ensure that the ‘O’ ring seal is in place.
When fitting the flameproof cover ensure the thread is
engaged correctly. Fully tighten the cover all the way, ensure
no gap is visible between the cover and base of the beacon
enclosure. Tighten the M4 grub screw.
7) Installation Requirements
7.1. Installation Standards Compliance
Warning –High voltage may be
present, risk of electric shock.
DO NOT open when energised,
disconnect power before opening.
The beacon must only be installed by suitably qualified
personnel in accordance with the latest issues of the relevant
standards.
ATEX / IECEx & UKEx installation 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 / IEC60079-10-2: Explosive atmospheres
- Classification of areas. Explosive dust atmospheres.
The installation of the units 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.
NEC / CEC Installation Standards
Cautions
Attention: Installation must be carried out by an
electrician in compliance with the National Electrical
Code, NFPA 70 or CSA 22.1 Canadian Electrical Code,
Part I, Safety Standard for Electrical Installations,
Section 32. / L'installation doit exclusivement être
réalisée par du personnel qualifié, conformément au
code national d'électricité américain, NFPA 70 ou CSA
22.1 Code canadien de l'électricité, première partie,
norme de sécurité relative aux installations électriques,
Section 32.
Attention: Disconnect from power source before
installation or service to prevent electric shock /
Débranchez-le de la source d'alimentation avant
l'installation ou l'entretien pour éviter tout choc
électrique.
The installation of the units 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.
7.2. Cable Selection and Connections
When selecting the cable size, consideration must be given to
the input current that each unit draws (see table 1), 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.
Electrical connections are to be made into the terminal blocks
on the PCBA, using solid wire 0.5-4mm2 / AWG 20-12 or
stranded wire, sizes 0.5-2.5mm2 / AWG 24-14. Wire insulation
needs to be stripped 8mm. Wires may be fitted securely with
crimped ferrules.
Figure 4: Wire Preparation.
Terminal screws need to be tightened down with a tightening
torque of 0.45 Nm / 5 Lb-in. A 4-way terminal block is provided
on the DC Beacon: 2-off +ve and 2-off -ve terminals.
See schematic diagram D191-06-621.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
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Document No. D199-00-621-IS
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Sheet 5 of 15
Figure 5: STExB2 Entries and Terminal Block Location.
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.
Earthing
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.
7.3. Cable Glands, Blanking Elements & Adapters
Follow the minimum temperature ratings of cables and cable
glands according to the approvals applied.
ATEX / IECEx & UKEx Requirements
For high ambient temperatures the cable entry
temperature may exceed 70ºC or the cable branching
point temperature may exceed 80ºC and therefore
suitable heat resisting cables and cable glands must be
used, with a rated service temperature at least as stated
below:
Table 2: ATEX / IECEx & UKEx Min. Ratings of Cables &
Cable Glands.
NEC / CEC Requirements Only
For high ambient temperatures the cable entry
temperature may exceed 60ºC or the cable branching
point temperature may exceed 60ºC and therefore
suitable heat resisting cables and cable glands must be
used, with a rated service temperature at least as stated
below:
Table 3: NEC / CEC Min. Ratings of Cables & Cable Glands.
Cable Glands & Blanking Plugs
Appropriate cable glands to be customer supplied.
ATEX / IECEx & UKEx Requirements Only
The cable entries have an M20 x 1.5 –6H entry thread.
Only suitably rated and ATEX / IECEx & UKEx certified
cable glands must be used. They must be suitable for the
type of cable being used and also meet the requirements
of the current installation standards EN 60079-14 /
IEC60079-14.
If the installation is made using conduit, openings must
have a sealing fitting connected as close as practical to
the wall of the enclosure, but in no case more than the
size of the conduit or 50mm, whichever is the lesser.
Any unused cable entries must be closed with suitably
rated and ATEX / IECEx & UKEx certified blanking plugs.
NEC / CEC Requirements Only
The cable entries have an M20 x 1.5 –6H entry thread.
If the installation is made using cable glands, only
suitably rated and certified cable glands must be used.
They must be suitable for the type of cable being used
and also meet the requirements of the current NEC /
CEC installation standards.
If the installation is made using conduit, openings must
have a sealing fitting connected as close as practical to
the wall of the enclosure, but in no case more than the
size of the conduit or 50mm, whichever is the lesser.
For use in Class I Division II locations, in order to
maintain the db type protection, flameproof conduit seals
and/or cable glands must be used.
Any unused cable entries must be closed with suitably
rated and certified blanking plugs.

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Sheet 6 of 15
Ingress Protection
Follow instructions according to the approvals applied.
ATEX / IECEx & UKEx Requirements Only
If a high IP (Ingress Protection) rating is required, then a
suitable sealing washer must be fitted under the cable
glands or blanking plugs. A minimum ingress protection
rating of IP6X must be maintained for installations in
explosive dust atmospheres.
For combustible dust applications, the cable entry device
and blanking elements shall be in type of explosion
protection and shall have an IP 6X rating.
NEC / CEC Requirements Only
If a high IP (Ingress Protection) rating is required then a
suitable sealing washer must be fitted under the cable
glands or blanking plugs. A minimum ingress protection
rating of IP6X must be maintained for installations in
explosive dust atmospheres.
Adapters
The STEx Beacon Range can be supplied with the following
types of adapters:
M20 to 1/2” NPT
M20 to 3/4” 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 certified
adapters.
8) Flash Pattern Settings
8.1. Flash Rate Setting
The STExB2 beacons can produce different flash patterns as
shown in Table 4. The flash patterns are selected by operation
of the flash setting DIP switch on the PCBA (See Fig 6).
For SIL 2 operation, only the 1Hz Flash rate is approved.
Figure 6: DIP Switch Location.
Switch
Setting
S1 Mode
SIL Approved
00
1Hz (60FPM)
Yes
01
1.33Hz (80FPM)
No
10
1.5Hz (90FPM)
No
11
Double Flash
No
Table 4: Switch Positions for Flash Patterns
9) End of Line Monitoring (DC Units)
All DC units 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 in the flameproof chamber. If an end of line resistor
is used it must have a minimum resistance value of 3k3 ohms
and a minimum wattage of 0.5W or a minimum resistance
value of 500 ohms and a minimum wattage of 2W.
The resistor must be connected directly across the +ve and -
ve terminals as shown in the following drawing. The resistor
leads should be kept as short as possible.
Figure 7: End of Line Resistor Placement.
SIL2 line monitoring module product version: see section 19
for standard default values and product coding. See document
D191-06-621 for associated wiring diagram.
10) Interchangeable & Spare Parts
The beacon lens is interchangeable, contact European Safety
Systems Ltd for a replacement lens available in various
colours.
The guard is an integral part of the protection and must be
reassembled exactly the same way as it was disassembled.
To change the lens, unscrew the M5 socket head screws and
remove the M5 screws, M5 spring & flat washers.
Warning –Hot surfaces. External surfaces
and internal components may be hot after
operation, take care when handling the
equipment.
Warning –high-intensity light source.
Avoid looking directly at the light source for
extended periods of time.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
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Document No. D199-00-621-IS
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Sheet 7 of 15
Figure 8: Removal of Lens.
Remove the guard and replace the old lens with the new lens.
Figure 9: Changing of Lens.
Fit the guard back on to the lens and casting, align the holes
of the guard, lens and casting. To reattach the lens, the fixings
MUST be in the order shown in Figure 10.
Figure 10: Lens & Guard Fixings Order.
11) Maintenance, Overhaul and Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
ATEX / IECEx & UKEx Requirements Only
EN60079-19/IEC60079-19 Explosive atmospheres –
Equipment repair, overhaul and reclamation
EN 60079-17/IEC60079-17 Explosive atmospheres –
Electrical installations inspection and maintenance
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.
Repair of the flameproof threaded joints and cemented joints
is not permitted.
Potential electrostatic charging hazard - Clean only with a
damp cloth.

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Sheet 8 of 15
12) SIL 2 Instruction Safety/Manual
Figure 11: 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, commissioned and used within the parameters
outlined in this manual. Failure to comply could result in an unintended unit operation or function.
Warning –The unit must be powered in either Standby or Active modes to comply with the SIL 2 approval requirement. If the
power is disrupted the unit must be allowed to go through the commissioning cycle to reset. Failure to complete the
commissioning cycle and continued disruption in the power supply will generate a fault state which will require the
beacon to be reset (see section 15-4).
SIL 2 System Description
The SIL 2 module monitors the function of the device and
provides feedback to the control panel. A fault condition can
be communicated by two methods:
•4 wire installation can be seen as per section 15-1.
A SIL 2 system wiring for fault detection in standby
and active mode with independent fault contacts.
•2 wire installation can be seen as per section 15-2. A
SIL 2 system by the introduction to the monitoring
circuit and linking in an end of line resistor can only
register the fault in standby mode.
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 signalling 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 periodically testing the system and
beacons, operation is put into Active mode.
The system panel or 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 fed to the positive (+) beacon
terminal and positive (+) is fed to the negative (–ve) beacon
terminal.
In Standby 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.
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 an 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 Active mode the beacon will output the selected flash
pattern. The SIL 2 module checks for the correct flash pattern
output and the functionality of the flash signal generation
process.
Power relay RLY1-1 will be open whilst SIL 2 relay RLY1-2 will
be closed contact between terminals 1 & 2.

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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 an open circuit between terminals 1 & 2.
Fault modes - The fault modes listed in sections 13-1 & 13-2
will result in a change of state for relays RLY1-1 and RLY1-2.
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.
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.
It is possible to reset these faults if they were transitory.
Resetting Failure (by power cycling) - 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.
Resetting Failure (by Hard Reset) - 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 15-4) 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 hard reset process does not correct the latched fault the
alarm horn sounder may require further investigation, please
contact your local E2S representative.
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. RLY1-2 will
subsequently close contacts 1 & 2 indicating healthy
operation. Contact 1 & 2 will only remain open in the event of
a fault or a loss of power.
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.
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 steady state.
The SIL 2 unit will continue to monitor the power and module
function.
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.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 10 of 15
14) SIL 2 Wiring Configuration and Beacon Set-Up
Figure 12: Terminals and header pins for beacon.
Power & Communication with the system control panel can be configured in two ways: - Although it is highly recommended that the
unit is wired as stated in section 15-1 as a 4-Wire System.
J1 Header –Current Sense Resistor (CSR)
Shown in factory default position A
(see section 15-3), places TB1 Current
sense resistor in circuit
J2 Header –Fault Resistor (FR)
Shown in factory default position A
(see section 15-3) removes power
supply terminal block. Fault resistor
& relay RLY 1-1out of circuit.
J7 Header –Hard Reset
Shown in factory default position A
(see section 15-4), set to
Normal operation
+
Beacon Supply Terminals
+
-
-
1
2 SIL Relay Terminals TB1
3

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 11 of 15
15-1) 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.
Terminal block TB1 is the output from the SIL 2 monitoring relay. Relay RLY 1-2 provides a closed circuit between TB1 terminals 1 &
2 whilst powered. On detection of a fault event this will become open circuit.
The fault will be seen via the SIL 2 TB1 terminals as soon as the fault occurs in either Active or Standby modes.
When no fault is detected the circuit to the SIL 2 TB1 terminals 1 & 2 will include a factory fitted 3.3K Ohm current sense resistor
(CSR) in series. When the circuit is driven with 24Vdc the detection current seen is ~7.3mA @ 24V.
The only other fault mode is if the cable goes short circuit where a short will be seen by the panel.
Option: Should the fault event output of RLY1-2 be required to operate as a switch, header J1 can be set to link pins 1 & 2 (see Figure
13) thereby removing the 3.3k Ohm current sense resistor (CSR) from the circuit.
Note: a cable short circuit will not be detectable in this configuration.
For one unit only:
Beacon power
supply terminal
block
Current drawn
(mA)
Active Mode
190mA
Standby Mode
25mA
SIL2
TB1 Current
Sense Resistor
value
Current drawn
(mA)
3.3kΩ
7.2mA
On fault mode, current drops to 0 as
circuit goes open.
Figure 13: Schematic of SIL 2 system wiring for fault detection in standby and active mode –4 wire installation.
If multiple SIL 2 alarm horn sounders are to be cabled in series, the monitoring connections differ from that of a single beacon. For
more information see manual D197-00-621-IS available from the E2S website.
15-2) SIL 2 System Wiring for Fault Detection in Standby Mode Only –2 Wire Installation
Cabling is required to the positive '+' and negative '-' power input terminals only. Monitoring will occur in standby mode only whilst
power supply polarity is reversed. An EOL resistor may be added during installation or can be factory fitted. See Table 5 for EOL
resistor value guidance.
The SIL2 monitoring module contains a factory fitted Power Supply Fault Resistor 2.2k Ohm (FR). When a fault is detected the Fault
Resistor will activated. The total measurable resistance of the EOL resistor and 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.
Important: - The 2 wire configuration will not warn of a fault whilst in Active mode. A fault will only be detectable in standby mode
when power supply polarity is reversed.
Important: - The 2-wire configuration requires the J2 header pin to be set to position B (see figure 16). Factory default position is A.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 12 of 15
Figure 14: 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:
Table 5: Resistor combinations and the currents drawn when no faults and faults occur.
If multiple SIL 2 alarm horn sounders are to be cabled in series, the monitoring connections differ from that of a single beacon. For
more information see manual D197-00-621-IS available from the E2S website.
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 5)
+

(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

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 13 of 15
15-3) Header Pins Settings
J1 Header Pin - Position A
Factory default position (pins 1 & 2 not linked).
Places TB1 Current Sense Resistor (CSR) in circuit.
As used in 4-Wire Configuration.
J1 Header Pin - Position B
(pins 1 & 2 linked)
Removes TB1 Current Sense Resistor (CSR) out of circuit.
Figure 15: J1 Header pin positions –Current Sense Resistor (CSR)
J2 Header Pin - Position A
Factory default position (pins 1 & 2 linked).
Removes power supply terminal Fault Resistor (FR) &
RLY 1-2 out of circuit.
As used in 4 -Wire Configuration
J2 Header Pin - Position B
(pins 2 & 3 linked)
Places power supply terminal Fault Resistor & RLY 1-2
in circuit.
As used in 2 –Wire Configuration.
Figure 16: J2 Header pin positions –Fault Resistor (FR)
15-4) SIL 2 Hard Reset Function
Power down the unit completely for a minimum of 30 seconds. Move the hard reset header pin (Jumper J7) to reset position B
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
Position A.
The unit has now been reset.
If the hard reset process does not correct the latched fault the beacon may require further investigation. Please contact your local
E2S representative.
J7 Header Pin - Position A
Factory default position (pins 2 & 3 linked).
Hard Reset Function disabled –Normal Operation.
J7 Header Pin - Position B
(pins 1 & 2 linked)
Hard Reset Enabled - Active reset mode.
Figure 17: J7 Header pin positions –Hard Reset Function

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 14 of 15
16) SIL 2 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.
17) 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:
1. Random Hardware Failures and Architectural constraints (route 1H).
2. 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
0.35 pmh
“Hazardous” failure rate (revealed)
0.287 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)
3.7 x 10-5
Proof Test Interval
Up to 1 year
18) Synchronised Operation
All STExB2 SIL2 beacons that are connected to the same supply line will have a synchronised flash rate at one flash every second.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-621-IS
Issue 2
27-10-22
Sheet 15 of 15
19) 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:
STExB2X05DC024AS1S1R/A-AFZ
•The first A character denotes the value of the Fault Resistor (FR). Default value is 2.2K Ohm (Code = A) unless an
alternative value is requested when ordering.
•The second F character denotes the value of the Current Sense Resistor (CSR). Default value is 3.3K Ohm (Code = F)
unless an alternative value is requested when ordering.
•The third Z character denotes the value of the unit End Of Line Resistor (EOL). By default no EOL resistor is factory fitted
(Code = Z). A factory fitted EOL resistor can be specified when ordering.
The values of resistors available are shown in table 6 below.
Code
Resistor Value
Default resistor coding is as follows:
STExB2X05DC024AS1S1R/A-AFZ
Example of a custom requirement resistor coding:
STExB2X05DC024AS1S1R/A-GEF
Where the (FR) Fault Resistor is (G = 3.9 kΩ)
(CSR) Current Sense Resistor is (E = 2.7 kΩ)
(EOL) End Of Line resistor is (F = 3.3 kΩ)
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
Note: To utilise the full monitoring functionality the 4-wire configuration is recommended. An EOL resistor is not required for this
configuration.
The alternative 2-wire configuration requires an EOL resistor to be fitted. The EOL resistor can be specified during ordering and
factory fitted or selected and fitted during the beacon installation.
See section 9 for EOL resistor location and wattage requirements. E2S recommends a value of 2.2K Ohm. If an alternative value is
required, please see section 15-2.
Both the (FR) Fault Resistor and (CSR) Current Sense Resistor are factory fitted and cannot be user replaced.

warning signals
2S
D1x
EUROPEAN SAFETY SYSTEMS LTD
IMPRESS HOUSE
MANSELL ROAD
ACTON
LONDON W3 7QH
WWW.E2S.COM
C
THIS DRAWING AND ANY INFORMATION OR DESCRIPTIVE
MATTER THEREIN IS COMMUNICATED IN CONFIDENCE AND
IS THE COPYRIGHT PROPERTY OF EUROPEAN SAFETY
SYSTEMS LTD. NEITHER THE WHOLE OR ANY EXTRACT MAY
BE DISCLOSED, LOANED, COPIED OR USED FOR
MANUFACTURING OR TENDERING PURPOSES WITHOUT THEIR
WRITTEN CONSENT.
EUROPEAN SAFETY SYSTEMS LTD.
AS PER LATEST DATE OF ISSUE SHOWN ABOVE
DRAWING TO BS8888:2000
GEOMETRIC TOLERANCES TO ISO1101:1983
LINEAR DIMENSIONAL TOLS
ANGULAR DIMENSIONAL TOLS
STANDARDS
MOD No. REASON - INITIAL - DATEISSUE
DATE
APPROVED
CHECKED DATE
DATE
DRAWN WEIGHT (Kg)
SURFACE FINISH
MATERIAL
ALTERNATIVE MATERIAL SHEETSCALE
TITLE
A3
IF IN DOUBT, ASK -
DO NOT SCALE
ALL DIMENSIONS IN MM
DRAWING NUMBER
A
B
C
D
E
F
G
109
G
F
E
78 6
5
D
C
134
2
A
B
D191-06-621
M.ABALOS
B.ISARD
R.N.POTTS OF
NTS 1 1
23/09/2022
23/09/2022
23/09/2022
D1xB2 / GNExB2 / STExB2 SIL2 DC XENON
BEACON WIRING DIAGRAM
INTRODUCTION
INTRODUCTION
1MA - 23/09/2022
SIL2 WIRING DIAGRAM
FOR THE FOLLOWING PRODUCTS:
D1xB2X05DC024-SIL
D1xB2X10DC024-SIL
D1xB2X15DC024-SIL
GNExB2X05DC024-SIL
GNExB2X10DC024-SIL
GNExB2X15DC024-SIL
STExB2X05DC024-SIL
STExB2X10DC024-SIL
STExB2X15DC024-SIL
EOL
Beacon -ve IN
+- +-
3 2 1
BEACON
POWER TERMINALS
SIL2 RELAY
TERMINALS TB1
Beacon -ve OUT
Beacon +ve IN
Beacon +ve OUT
SIL2 +ve Relay Monitor w/ EOL
SIL2 -ve Relay Monitor w/ EOL
4-Wire SIL2 RLY1-2
OPTIONAL LINE MONITORING RESISTOR - CUSTOMER SUPPLIED
RECOMMENDED VALUE FOR SIL2 EOL = 2.2kΩ 2W
MINIMUM EOL RESISTOR VALUES FOR 28V DC MAX VOLTAGE
500Ω MIN AT 2W MIN OR 2.4kΩ MIN AT 0.5W MIN
EOL








E2STelephone:+44(0)2087438880Fax:+44(0)2087404200Email:[email protected]www.e2s.comDC‐070_Issue_G(STEx).docx‐Page1of2‐QAF_252_Issue_5

EUDeclarationofConformity
Manufacturer:  EuropeanSafetySystemsLtd.
ImpressHouse,MansellRoad,Acton
London,W37QH
UnitedKingdom

AuthorisedRepresentative:E2SWarnsignaltechnikUG
Charlottenstrasse45‐51
72764Reutlingen
Germany

EquipmentType:  STExS1,STExS2,STExL1,STExL2
STExB2X05,STExB2X10,STExB2X15,STExB2X21
STExB2LD2,STExB2RT1
STExC1X05
STExJ2
Directive2014/34/EU:EquipmentandProtectiveSystemsforuseinPotentiallyExplosiveAtmospheres(ATEX)
NotifiedBodyforEUtypeExamination(ModuleB):ULInternationalDemkoA/S
NotifiedBodyNo.:0539
Borupvang5A,2750Ballerup,Denmark
EU‐typeExaminationCertificate(ModuleB):DEMKO16ATEX1466X
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.:2813
CSAGroupNetherlandsB.V,Utrechtseweg310,6812AR,Arnhem,Netherlands
QualityAssuranceNotification(ModuleD):SIRA05ATEXM342
Provisionsfulfilledbytheequipment:II2GExdbIICT6…T3Gb
II2DExtbIIICT82°C…T137°CDb
IP6XDustProtectiontoEN60079‐0/EN60079‐31
Standardsapplied:ENIEC60079‐0:2018
EN60079‐1:2014
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,includingamendmentbyDirective2015/863/EU.

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
EN60529:1991/A1:2000/A2:2013‐Degreesofprotectionprovidedbyenclosures(IPcode)–enclosureratedIP66








E2STelephone:+44(0)2087438880Fax:+44(0)2087404200Email:[email protected]www.e2s.comDC‐070_Issue_G(STEx).docx‐Page2of2‐QAF_252_Issue_5




MartinStreetzDocumentNo.:DC‐070_Issue_G
QualityAssuranceManagerDateandPlaceofIssue:London,03/12/2021
EUDeclarationofConformity


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.





E2STelephone:+44(0)2087438880Fax:+44(0)2087404200Email:[email protected]www.e2s.comDC‐100_Issue_A(STEx)‐Page1of2‐QAF_252_Issue_5

UKCADeclarationofConformity
Manufacturer:  EuropeanSafetySystemsLtd.
ImpressHouse,MansellRoad,Acton
London,W37QH
UnitedKingdom

EquipmentType:  STExS1,STExS2,STExL1,STExL2
STExB2X05,STExB2X10,STExB2X15,STExB2X21
STExB2LD2,STExB2RT1
STExC1X05
STExJ2
DirectiveUKSI2016:1107(asamendedbyUKSI2019:696)–Schedule3A,Part1:ProductorProtectiveSystemIntendedforuseinPotentiallyExplosiveAtmospheres
(UKCA)

NotifiedBodyforUKtypeExamination(ModuleB):ULInternational(UK)Ltd
NotifiedBodyNo.:0843
Unit1‐3HorizonKingslandBusinessPark,WadeRoad,
Basingstoke,HampshireRG248AHUK
UK‐typeExaminationCertificate(ModuleB):UL21UKEX2019X
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):CSAE22UKQAN0046
Provisionsfulfilledbytheequipment:II2GExdbIICT6…T3Gb
II2DExtbIIICT85°C…T137°CDb
IP6XDustProtectiontoEN60079‐0/EN60079‐31
Standardsapplied:ENIEC60079‐0:2018
EN60079‐1:2014
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,includingamendmentbyDirective2015/863/EU.
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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
EN60529:1991/A1:2000/A2:2013‐Degreesofprotectionprovidedbyenclosures(IPcode)–enclosureratedIP66
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E2STelephone:+44(0)2087438880Fax:+44(0)2087404200Email:[email protected]www.e2s.comDC‐100_Issue_A(STEx)‐Page2of2‐QAF_252_Issue_5
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MartinStreetzDocumentNo.:DC‐100_Issue_A
QualityAssuranceManagerDateandPlaceofIssue:London,24/02/2022
UKCADeclarationofConformity
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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.
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ThisDeclarationisissuedunderthesoleresponsibilityofthemanufacturer.