E2S STExS2 User manual

INSTRUCTION MANUAL
STExS2
Alarm Horn Sounder
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. D199-00-051-IS
Issue 3
13-05-22
Sheet 1 of 8
STExS2F
STExS2H
1) Product Table
Standards
Unit Type Code
Nominal
Input Voltage
Nominal
Input Current
Voltage
Range
Max.
Current
Sound
Pressure Level
P2, dB(A)
Sound
Pressure Level
P3, dB(A)
P2
P3
P2
P3
Max*
Nom.†
Max*
Nom.†
STExS2FDC024
12Vdc
289mA
356mA
11.5-54Vdc
324mA
740mA
120
115
123
118
ATEX / IECEx / UKEx /
NEC / CEC
24Vdc
324mA
740mA
48Vdc
195mA
391mA
STExS2FAC230
115Vac
125mA
282mA
100-240Vac
50/60Hz
138mA
325mA
120
115
123
118
230Vac
78mA
167mA
STExS2HDC024
12Vdc
289mA
356mA
11.5-54Vdc
324mA
740mA
124
119
127
122
24Vdc
324mA
740mA
48Vdc
195mA
391mA
STExS2HAC230
115Vac
125mA
282mA
100-240Vac
50/60Hz
138mA
325mA
124
119
127
122
230Vac
78mA
167mA
*Max = Tone 4
†Nom. = Tone 44
The table shows the input current taken by the various sounders.
The current levels shown above are for the 440Hz Continuous tone @ nominal input voltage at P2 and P3 power setting.
Nominal current at nominal voltage.
Max rated current at worst case supply voltage.
Table 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.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 2 of 8
2) Warnings
•DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE IS
PRESENT.
•POTENTIAL ELECTROSTATIC CHARGING HAZARD.
•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.
Products may have further approvals, see E2S website for
further details.
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"
EN 60079-31:2014 / IEC 60079-31:2013 (Ed 2):
Explosive Atmospheres - Equipment dust ignition protection
by enclosure "t"
Model No:
Rating
STExS2DC024
Ex db IIC T6 Gb Ta -50°C to +55°C
Ex db IIC T5 Gb Ta -50°C to +70°C
Ex db IIIC T94°C Db Ta -50°C to +70°C
STExS2AC230
Ex db IIC T6 Gb Ta -50°C to +65°C
Ex db IIC T5 Gb Ta -50°C to +70°C
Ex db IIIC T84°C Db Ta -50°C to +70°C
Certificate No.
DEMKO 16 ATEX 1466X
IECEx ULD 16.0017X
UL21UKEX2019X
Epsilon x
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
Gas Class I
All models are approved for use as Alarm Horns also comply
with the following standards for signalling equipment:
UL464A & 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
STExS2:
DC024
Class 1 Zone 1 AEx db IIC T5 Gb Ta -50°C to +70°C
Class 1 Zone 1 AEx db IIC T6 Gb Ta -50°C to +55°C
STExS2:
AC230
Class 1 Zone 1 AEx db IIC T5 Gb Ta -50°C to +70°C
Class 1 Zone 1 AEx db IIC T6 Gb Ta -50°C to +65°C
Installation must be carried out in compliance with the
National Electrical 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
STExS2:
DC024
Ex db IIC T5 Gb Ta. -50°C to +70°C
Ex db IIC T6 Gb Ta. -50°C to +55°C
STExS2:
AC230
Ex db IIC T5 Gb Ta. -50°C to +70°C
Ex db IIC T6 Gb Ta. -50°C to +65°C
Installation must be carried out in compliance with the
Canadian Electric Code.
NEC & CEC Class / Division Ratings for US / Canada,
USL CNL
Standards
UL464A (Ed. 1) 2017
Standard for Audible Signal Appliances for General
Signalling Use
CSA C22.2 No. 205-17 (Ed. 3) 2017
Signal Equipment
Rating
STExS2:
DC024
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
STExS2:
AC230
Class I Div 2 Group ABCD T5 Ta -50°C to +70°C
Class I Div 2 Group ABCD T6 Ta -50°C to +65°C
Installation must be carried out in compliance with the
National Electric Code / Canadian Electric Code.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 3 of 8
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
T5
100ºC
T6
85ºC
(STExS2DC024 up to 55ºC ambient,
STExS2AC230 up to 65 ºC 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)
STExS2
DC 94ºC
AC 84ºC
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 plastic horn is not anti-static, and 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.
NEC / CEC Requirements Only
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 sounder should be secured to any flat surface using the
three 7mm fixing holes (see figures 2 or 3). The angle can then
be adjusted as required but the mounting restrictions must be
observed (see outline drawings for details, D199-05-051 for
STExS2F and D199-05-071 for STExS2H). This can be
achieved by loosening the two large bracket screws in the side
of the unit, which allow adjustments in steps of 18°.
Figure 2: Fixing Location for STExS2F Sounder.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 4 of 8
Figure 3: Fixing Location for STExS2H Sounder.
On completion of the installation the two large bracket
adjustment screws on the side of the unit must be fully
tightened to ensure that the unit cannot move in service.
The enclosure provides IP66 protection and is suitable for
installation in exterior locations providing it is positioned so that
water cannot collect in the horn, and the cable entry is sealed.
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 sounder
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 sounder cover. Open the
enclosure by turning the sounder cover counterclockwise and
remove the cover, taking extreme care not to damage the
flameproof threads in the process (See figure 4).
Figure 4: 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.
Ensure that the ‘O’ ring seal is in place and undamaged.
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 sounder
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 sounder 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 the NEC / CEC and any local regulations 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 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.
Electrical connections are to be made into the terminal blocks
on the PCBA located in the flameproof enclosure 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.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 5 of 8
Figure 5: Wire Preparation.
Terminal screws need to be tightened down with a tightening
torque of 0.45 Nm / 5 Lb-in. An 8-way terminal block is
provided on the AC Sounder, and a 6-way terminal block is
provided on the DC Sounder.
Figure 6: STExS2 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
Both AC and DC sounder units must be connected to an earth
according to EN/IEC 60079/14. The units are provided with
internal and external earth terminals which are both located on
the terminal chamber section of the unit (see figure 6).
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 between the two M5 stainless steel flat
washers, then reassemble the M5 spring washer and tighten
the M5 nut to ensure that the cable lug is secured against
loosening and twisting. The external earth conductor should be
at least 4mm2in size.
ATEX / IECEx & UKEx Requirements Only
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.
NEC / CEC Requirements Only
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 but at least a mini mum of 0.82mm2 / 18AWG
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 Only
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.
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
installation standards for NEC / CEC.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: [phone]
Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 6 of 8
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.
Ingress Protection
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.
Adapters
The STEx 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 certified
adapters.
8) Settings
Following illustrations show the different settings available for
STExS2 Alarm Horn Sounders. See schematic diagrams
D190-06-001 for DC units and D190-06-005 for AC units.
8.1. SPL Configuration
See Table 1 for product power supply and Sound Pressure
Levels (SPL).
Configuration for DC Units
Figure 7: DC PCBA SPL Configuration.
Configuration for AC Units
Figure 8: AC PCBA SPL Configuration.
8.2. Stage Switching Polarity (DC Units)
Switching from positive switching (default) to negative
switching - DC Only.
NOTE: Max supply is 33V DC –if higher DC voltage is
required, use Negative switching.
Figure 9: Stage Switching Polarity.
8.3. Tone Selection
The STExS Alarm Horn Sounders have 64 different tones that
can be selected independently for the first and second stage
alarms. The tones are selected by operation of the tone setting
DIP switch 1 & DIP 2witch 2 (see figures 7 and 8) on the PCB,
for stage 1 and stage 2 respectively.
Default = S2 –Tone 1
Default = S1 –Tone 44
(ON = 1, OFF = 0)
Figure 10: DIP switch configuration

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
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Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 7 of 8
The sounder can also be switched to sound the third and fourth
stage alarm tones.
The tone table (D221-95-001-IS) shows the switch positions
for the 64 tones on first and second stages and which tones
are available for the third and fourth stages dependent on the
Stage 1 DIP switch setting.
Following table (Table 3) is a summary of the wiring options.
Figure
Voltage
Configuration
Features
Default
Option
Special
Code
Identifier
See documents D190-06-001 for DC schematic diagrams.
1a
DC
Single Stage Configuration
•Line monitoring
•Positive Switching
Default
-
1b
DC
Two Stage Configuration
•Common Negative
•Positive Switching
Default
-
1c
DC
Three/Four Stage Configuration
•Common Negative
•Positive Switching
Default
-
2
DC
Three/Four Stages. Voltage
Free 2nd, 3rd & 4th Stage
Activation Configuration
•Common Positive
•Customer Set H1 & H2 to
Negative Switching
-
-
3
DC
Two Stage Configuration
•Independent Stage Input
•Reverse Polarity Stage
Monitoring
-
-
4
DC
Two Stage Configuration
•Line Stage Monitoring (Use
suitable monitoring relays/
modules)
•Not to be used in reverse
polarity monitoring
Custom
Y
5
DC
Two/Three Stage Voltage Free
Activation Configuration
Custom
K
6
DC
Three/Four Stage Configuration
•Independent Stage Input
•Line Stage Monitoring (Use
suitable monitoring relays/
modules)
•Positive Switching (Default)
Custom
V
See documents D190-06-005 for AC schematic diagrams.
1a
AC
Single Stage Configuration
Default
-
1b
AC
Three/Four Stage Configuration
Default
-
2
AC
Two Stage Voltage Free
Activation Configuration
Custom
K
Table 3: Summary of Wiring Options.
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. See D190-06-001 for
details.
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 11: End of Line Resistor placement.

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
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Document No. D199-00-051-IS
Issue 3
13-05-22
Sheet 8 of 8
9.1. Custom DC Multi-Stage End Of Line Monitoring
An optional 12-way terminal module is available to enable up
to four alarm stages to be activated from three DC voltage
output channels. The three alarm stage activation inputs can
be independently monitored.
Refer to Schematic D190-06-001, Config. 6.
Specify Product option ‘V’ when ordering.
Spare part code for field installation: SP78-0001
Figure 12: End of Line Resistor placement –Optional 12-Way
Terminal Module.
10) 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
Repair of the flameproof threaded joints and cemented joints
is not permitted.
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.
Potential electrostatic charging hazard - Clean only with a
damp cloth.