E2S BExS110D-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. D197-00-601-IS Issue F 16-06-17 Sheet 1 of 19 (1)
INSTRUCTION MANUAL (ATEX/IECEx/SIL2)
BExS110D-SIL Flameproof Sounders For use in
Flammable Gas 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.: BExS110D-SIL
Input Voltage: DC Units 24V
BExS110D-SIL: Ex d IIC T4 Gb Ta. -50°C to +55°C
Ex d IIB T4 Gb Ta. -50°C to +70°C
Ex tb IIIC T100°C Db Ta. -50°C to +55°C
Ex tb IIIC T115°C Db Ta. -50°C to +70°C
Certificate No. KEMA 99ATEX6312X
IECEx KEM 10.0003X
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 (up to 55°C
ambient)
Temperature Classification:
T1
450ºC
T2
300ºC
T3
200ºC
T4
135ºC
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:
100ºC at +55 ºC ambient
115 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 +55°C Gas Groups IIA, IIB and IIC
-50°C to +70°C Gas Groups IIA and IIB
-50°C to +70°C Dust Groups IIIA, IIIB and IIIC
SIL 2 Unit operating temperature range –25ºC to +60ºC
0518
II 2G
II 2D
Epsilon x
Equipment Group and
Category:
CE Marking
Notified Body No.
BExS110D-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. D197-00-601-IS Issue F 16-06-17 Sheet 2 of 19 (2)
3) Type Approval Standards
The sounder 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 sounder 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 / IEC60079-10-2: Explosive atmospheres –
Classification of areas. Explosive dust atmospheres
The installation of the sounder 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 sounder 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 sounder 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 sounder 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 S110 Sounder
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. D197-00-601-IS Issue F 16-06-17 Sheet 3 of 19 (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 sounders and shows the maximum voltage at which
the sounders can be operated:
The input current will vary according to the voltage input level
and the frequency of the tone selected. The current levels
shown above are for the 440Hz Continuous tone @ 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 sounders 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 sounders
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 sounder 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 sounder 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.
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
BExS110D-SIL
24Vdc
290mA
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. D197-00-601-IS Issue F 16-06-17 Sheet 4 of 19 (4)
12) S110 DC Wiring
A 4-way terminal block is provided on the DC Sounder. There
are 1-off +ve, 1-off -ve, 1-off stage 2 and 1-off stage 3
terminals in total.
12.1 Wiring Diagrams
Fig. 4a DC Simplified Block Diagram (Positive switching)
Fig. 4b DC Simplified Block Diagram (Negative switching)
12.2 Stage Switching
12.2.1 Units First Stage Tones
Stage one (S1) Operation
Simply connect the supply
voltage to the + and -
supply terminals, (see fig.
5).
12.2.2 DC Units Second & Third Stage Tone
Selection
For units set up for –ve switching (default setting):
Stage two (S2) Operation
Power +ve and –ve, link a -
ve supply line to the S2
terminal.
Dip switch alters stage 2
tone.
Stage three (S3) Operation
Power +ve and –ve, link a -
ve supply line to the S3
terminal.
Dip switch alters stage 3
tone.
For units set up for +ve switching (refer to 13.3):
Stage two (S2) Operation
Power +ve and –ve, link a
+ve supply line to the S2
terminal.
Dip switch alters stage 2
tone.
Stage three (S3) Operation
Power +ve and –ve, link a
+ve supply line to the S3
terminal.
Dip switch alters stage 3
tone.
Fig. 5 S110 DC Terminals
12.3 S110 Stage Switching Polarity (DC
Units Only)
The BExS110D DC sounders have the facility to use either
+ve or –ve switching to change the tone to the second and
third stages. Negative switching is the default setting. For –ve
switching connect the two headers on the pcb to the left-hand
(marked –ve) and centre pins. For +ve switching connect the
headers to the right hand (marked +ve) and the centre pins.
(Refer to Fig. 6)
Fig. 6 Stage Switching Polarity
DIP Switch
DC Terminals
Stage Headers
Negative Switching Activated
Positive Switching Activated
Header Pin Location
Header Pin Location
S2
S3
-
+
-
+
-
+

_______________________________________________________________________________________________________________________________
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. D197-00-601-IS Issue F 16-06-17 Sheet 5 of 19 (5)
13) Volume Control (None)
BExS110D-SIL sounder have no volume control, as the unit
is monitoring its output the volume cannot be adjusted.
SIL 2 APPROVED TONE SELECTION TABLE
BExS110D-SIL sounders need to be set to one off the SIL 2
approved tones to work correctly with the automated sounder
check on pattern generation and signal output checks
Important:- Only tones 1, 2, 11, 19 and 31 are approved
for use in the SIL 2 application. Ensure that the unit is set to
one of these tones. As factory default the sounder should be
set to Tone 1.
Tone Selection
DIP
Switch
Settings
Stage Selection
Stage 1
Frequency
Description
12345
Stage 2
Stage 3
1
Continuous 1000Hz
Toxic Gas Alarm
0 0 000
Tone 31
Tone 11
2
Alternating 800/1000Hz at
0.25s intervals
1 0 000
Tone 17
(NOT SIL
Approved)
Tone 5
(NOT SIL
Approved)
11
Intermittent 1000Hz at
0.5Hz General alarm
0 1 010
Tone 31
Tone 1
19
1400Hz to 1600Hz sweep
up over 1s - 1600Hz to
1400Hz sweep down over
0.5s
0 1 001
Tone 2
Tone 5
(NOT SIL
Approved)
31
1200/500Hz at 1 Hz
Prepare to Abandon
Platform
0 1 111
Tone 11
Tone 1
GENERAL TONE SELECTION TABLE
Note not all of these tones are approved to work in a SIL 2
configuration, see the SIL 2 Approved tone selection table for these.

_______________________________________________________________________________________________________________________________
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. D197-00-601-IS Issue F 16-06-17 Sheet 6 of 19 (6)
Tone Selection
DIP Switch
Settings
Stage Selection
Stage 1
Frequency Description
1 2 3 4 5
Stage 2
Stage 3
1
Continuous 1000Hz Toxic Gas Alarm
0 0 0 0 0
Tone 31
Tone 11
2
Alternating 800/1000Hz at 0.25s intervals
1 0 0 0 0
Tone 17
Tone 5
3
Slow Whoop 500/1200Hz at 0.3Hz with 0.5s gap repeated
0 1 0 0 0
Tone 2
Tone 5
4
Sweeping 800/1000 at 1Hz
1 1 0 0 0
Tone 6
Tone 5
5
Continuous at 2400Hz
0 0 1 0 0
Tone 3
Tone 27
6
Sweeping 2400/2900Hz at 7Hz
1 0 1 0 0
Tone 7
Tone 5
7
Sweeping 2400/2900Hz at 1Hz
0 1 1 0 0
Tone 10
Tone 5
8
Siren 500/1200/500Hz at 0.3Hz
1 1 1 0 0
Tone 2
Tone 5
9
Sawtooth 1200/500Hz at 1Hz
0 0 0 1 0
Tone 15
Tone 2
10
Alternating 2400/2900Hz at 2Hz
1 0 0 1 0
Tone 7
Tone 5
11
Intermittent 1000Hz at 0.5Hz General alarm
0 1 0 1 0
Tone 31
Tone 1
12
Alternating 800/1000Hz at 0.875Hz
1 1 0 1 0
Tone 4
Tone 5
13
Intermittent 2400Hz at 1Hz
0 0 1 1 0
Tone 15
Tone 5
14
Intermittent 800Hz 0.25s on 1s off
1 0 1 1 0
Tone 4
Tone 5
15
Continuous at 800Hz
0 1 1 1 0
Tone 2
Tone 5
16
Intermittent 660Hz 150mS on, 150mS off
1 1 1 1 0
Tone 18
Tone 5
17
Alternating 544Hz (100mS)/440Hz(400mS)
0 0 0 0 1
Tone 2
Tone 27
18
Intermittent 660Hz 1.8s on, 1.8s off
1 0 0 0 1
Tone 2
Tone 5
19
1400Hz to 1600Hz sweep up over 1s - 1600Hz to 1400Hz
sweep down over 0.5s
0 1 0 0 1
Tone 2
Tone 5
20
Continuous 660Hz
1 1 0 0 1
Tone 2
Tone 5
21
Alternating 554/440Hz at 1Hz
0 0 1 0 1
Tone 2
Tone 5
22
Intermittent 554Hz at 0.875Hz
1 0 1 0 1
Tone 2
Tone 5
23
800Hz pulsing at 2Hz
0 1 1 0 1
Tone 6
Tone 5
24
Sweeping 800/1000Hz at 50Hz
1 1 1 0 1
Tone 29
Tone 5
25
Sweeping 2400/2900Hz at 50Hz
0 0 0 1 1
Tone 29
Tone 5
26
Simulated bell sound
1 0 0 1 1
Tone 2
Tone 1
27
Continuous 554Hz
0 1 0 1 1
Tone 26
Tone 5
28
Continuous 440Hz
1 1 0 1 1
Tone 2
Tone 5
29
Sweeping 800/1000Hz at 7Hz
0 0 1 1 1
Tone 7
Tone 5
30
420Hz repeating 0.625s on, 0.625s off Australian alert signal
1 0 1 1 1
Tone 32
Tone 5
31
1200/500Hz at 1 Hz Prepare to Abandon Platform
0 1 1 1 1
Tone 11
Tone 1
32
Sweeping 500/1200Hz 3.75s on, 0.25s off 15Hz
1 1 1 1 1
Tone 26
Tone 1

_______________________________________________________________________________________________________________________________
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. D197-00-601-IS Issue F 16-06-17 Sheet 7 of 19 (7)
14) SIL 2 Instruction/Safety Manual
Figure 7 - The SIL 2 Module monitors the Sounder 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.
Warning –Only SIL 2 approval tones can be used to comply with the SIL 2 approval requirement. See SIL approved tone
selection table in section 15.
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 18.1. A
SIL 2 system wiring for fault detection in standby and active
mode –2 wire installation can be seen as per section 18.2.
The new SIL 2 version of the E2S BExS110-SIL alarm horn
sounder and BExBG05-SIL, BExBG10-SIL & BExBG15-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.
15) SIL 2 System Terms and Function
The SIL 2 Sounder Unit Monitors
•Standby mode and Active mode
•Health status of power supply
•Sounder correct function and tone pattern
The SIL 2 sounder operates as part of a SIL 2 system.
The sounder will after commissioning remain powered in
Standby mode (reverse polarity) until the sounder is required
to operate. When the signaling device is required to operate
the polarity is changed to normal supply and the sounder will
go into Active mode where it will start to sound the correct
tone. When testing the system and sounders 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 (+) sounder
terminal and positive (+) is feed to the negative (–ve) sounder
terminal.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
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Document No. D197-00-601-IS Issue F 16-06-17 Sheet 8 of 19 (8)
In this mode the sounder will not sound the tone 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 open circuit between terminals 1 &
2.
Active Mode –This is where the power is in normal polarity,
positive (+) supplied to the positive (+) sounder terminal and
negative (–ve) is supplied to the negative (–ve) sounder
terminal.
In this mode the sounder will sound tone giving the warning
signal, the SIL 2 unit is actively checking the sounders
function for tone output and sounder controller signal
generation to the right tone 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 17-1 & 17-2 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 circuit between terminals 1 &
2.
15-1 Sounder Failure
•Tone Failure –No Tone detected
•Sounder Controller failure –No tone generation
pulse detected
•Tone Rate Failure –Regular tone 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.
15-2 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 24) 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 sounder 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 sounder 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 sounder controller
and tone pattern 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 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 sounder 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 50
milliseconds 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. D197-00-601-IS Issue F 16-06-17 Sheet 9 of 19 (9)
16) SIL 2 Wiring configuration and Sounder set-up
Figure 8 –Terminals and header pins for sounder
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 this section 18-1
•16-1 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 sounder power supply terminals block 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 block 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 3.3kΩcurrent 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 11) which shorts
out the 3.3KΩcurrent sense resistor making TB1 terminal 1 & 2 into a switch. The disadvantage is that a short circuit on this
cable will not be detected.
Sounder power
supply terminal
block
Current
drawn (mA)
Active Mode
190mA
Standby Mode
25mA
TB1 Current
Sense Resistor
value
Current
drawn(mA)
3.3kΩ
7.3mA
Figure 9 - Schematic of SIL 2 system wiring for fault detection in standby and active mode –4 wire installation
On fault mode, current drops
to 0 as circuit goes open.
Sounder Supply Terminals
DIP Switch Tone Selection
SIL Relay Terminals TB1
J7 Header –Shown in
factory default position A
(see section 24), set to
Normal operation
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 18.3) removes
power supply terminal block
Fault resistor out of circuit.
For one unit only:
3 2 1
-
+

_______________________________________________________________________________________________________________________________
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. D197-00-601-IS Issue F 16-06-17 Sheet 10 of 19 (10)
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 9.
▪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. D197-00-601-IS Issue F 16-06-17 Sheet 11 of 19 (11)
•16-2 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 12), as the units
default position is A.
Figure 10 - 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. D197-00-601-IS Issue F 16-06-17 Sheet 12 of 19 (12)
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
10.
▪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. D197-00-601-IS Issue F 16-06-17 Sheet 13 of 19 (13)
16-3 Header Pins 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 terminal Fault resistor & RLY 1-2 out of
circuit.
J2 Header Pin - Postion B (pins 2 & 3 linked)
places power supply terminal Fault resistor &
RLY 1-2 in circuit.
Figure 11: J1 Header pin positions
Figure 12: J2 Header pin positions

_______________________________________________________________________________________________________________________________
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. D197-00-601-IS Issue F 16-06-17 Sheet 14 of 19 (14)
17) SIL 2 Specific Unit Mounting
Requirements
The sounder should be mounted no closer that 5m from a
sounder source of similar SPL output. This is to ensure false
tone activation does not occur when the unit is monitoring the
tone pulse duration and tone failure.
18) 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 (ie hardware fault tolerance of 0) at
SIL 2
The product was assessed against failure modes:
•Failure respond to an input with a correct tone
•Failure to respond to an input even with an
alternative tone
•Spurious sound output despite no input
BExS110D-SIL (Correct tone needed)
Integrity in respect of failure to
release
SIL 2
Total Failure rate
0.304 pmh
“hazardous” failure rate (revealed)
0.233 pmh
“hazardous” failure rate (unrevealed)
0.017 pmh
“safe” failure rate (revealed)
0
“safe” failure rate (unrevealed)
0
Diagnostic Coverage
93%
System type
B
Hardware Fault Tolerance
0
Safe Failure Fraction
>93%
PFD (hazardous failure)
9.4 x 10-5
Proof Test Interval
Up to 1 week
BExS110D-SIL (Total failure)
Integrity in respect of failure to
release
SIL 2
Total Failure rate
0.304 pmh
“hazardous” failure rate (revealed)
0.235 pmh
“hazardous” failure rate (unrevealed)
0.005 pmh
“safe” failure rate (revealed)
0.01
“safe” failure rate (unrevealed)
0
Diagnostic Coverage
98%
System type
B
Hardware Fault Tolerance
0
Safe Failure Fraction
>98%
PFD (hazardous failure)
2.0 x 10-5
Proof Test Interval
Up to 1 week
19) Synchronised Operation
All BExS110D-SIL sounders that are connected to the same
supply line will be synchronised as tone as the same tone
pattern is selected.
20) End of Line Monitoring
On BExS110D-SIL DC units, DC reverse line monitoring can
be used if required. All DC sounders 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 2 system, the customer
selected EOL resistor is kept to a value of 2.2kΩhowever
variation is allowed as required by the SIL 2 systems PLC
parameters. See section 18.2 & 25.
Values of current draw are given for the 2.2kΩresistor if used
as set up in section 18.
If an alternative value end of line resistor is used it must have
a minimum resistance value of 3.3kΩ and a minimum
wattage of 0.5 watts or a minimum resistance value of 500Ω
and a minimum wattage of 2 watts.

_______________________________________________________________________________________________________________________________
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. D197-00-601-IS Issue F 16-06-17 Sheet 15 of 19 (15)
21) 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 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 been reset. Close the unit as noted in section 8.
If the hard reset does not correct the fault the unit or power
supply integrity will need further investigation.
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 13 - Hard reset Jumper settings
22) 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: BEXS110D-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:
BEXS110D24DC-SIL-AZ
This shows a standard 24V dc S110 SIL 2 sounder 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. D197-00-601-IS Issue F 16-06-17 Sheet 16 of 19 (16)
Figure 14 –Schematic of 18-1 SIL 2 system wiring for fault detection in standby and active mode –4 wire installation 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. D197-00-601-IS Issue F 16-06-17 Sheet 17 of 19 (17)
Figure 15 - Schematic of 18-1 SIL 2 system wiring for fault detection in standby and active mode –4 wire installation 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. D197-00-601-IS Issue F 16-06-17 Sheet 18 of 19 (18)
Figure 16 –Schematic of 18-2 SIL 2 system wiring for fault detection in standby mode only –2 wire installation 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. D197-00-601-IS Issue F 16-06-17 Sheet 19 of 19 (19)
Figure 17 - Schematic of 18-2 SIL 2 system wiring for fault detection in standby mode only –2 wire installation in star formation.

E2S Telephone: [phone] Fax: [phone] Email: sal[email protected] www.e2s.com DC-064_Issue_E (BExS SIL2).docx - Page 1 of 1 -
QAF_252_Issue_5
Martin Streetz Document No.: DC-064_Issue_E
Quality Assurance Manager Date and Place of Issue: London, 19/04/2016
EU Declaration of Conformity
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