INSTRUCTION MANUAL (ATEX)
Syrex IS-XN
Intrinsically Safe LED Beacon
This instruction sheet describes installations which conform
to BS EN 60079:Part14:2003 Electrical Installation in
Hazardous Areas. When designing systems for installation
outside the UK, the local Code of Practice should be
consulted.
1) The certification marking is as follows:
Syrex IS-XN Beacon
II 1G EEx ia IIC T4 (-40ºC <=Ta<= +60°C)
Ui = 28V Pi = 1.2W
Ci = 0 Li = 0
The Syrex IS-XN beacon is CE marked for
compliance with the European Explosive
Atmospheres Directive 94/9/EC and the
European EMC Directive 89/336/EEC
SIRA 05ATEX2269X
0518
Year / Serial No. 05 / 6MB000001
WARNING: TO AVOID A POSSIBLE ELECTROSTATIC
CHARGE ONLY CLEAN WITH A DAMP CLOTH
Oldham OL4 1HW. UK.
Klaxon Signals Ltd.
1. INTRODUCTION
The Syrex IS-XN is an ATEX certified intrinsically safe
beacon which will produce a visual warning in a hazardous
2) The equipment may be used in zones 0, 1 and 2
with flammable gases and vapours with apparatus
groups IIA, IIB & IIC and with temperature classes
T1, T2, T3 and T4.
area. Red, Amber, Green and Blue output models are
available.
3) The equipment is only certified for use in ambient
temperatures in the range -40oC to +60oC and
should not be used outside this range.
4) The certificate number has an ‘X’ suffix, which
indicates that the certificate contains one of more
special conditions for safe use. Those installing or
inspecting the equipment should refer to this section
of the certificate.
5) The equipment has not been assessed as a safety-
related device (as referred to by Directive 94/9/EC
Annex II, clause 1.5).
6) Installation of this equipment shall be carried out by
suitably-trained personnel in accordance with the
applicable code of practice.
2. DESCRIPTION
The device will start to flash when power is applied to
terminals + and -. The beacon has two flash rates one double
flash per second and two double flashes per second. The
flash rate is selected by setting an internal pin header. The
unit is factory set to produce two double flashes per second.
3. SUPPLY VOLTAGE
The Syrex IS-XN beacon has been designed to operate in a
hazardous area via a 28V 300 ohm ATEX certified Zener
barrier or galvanic isolator. The beacon may be tested or
used in safe areas without a Zener barrier or galvanic
isolator, but at supply voltages above 16V the internal current
limit will function and the brightness may be reduced. The
beacon should not be continuously operated without a barrier
or isolator with a supply voltage greater than 16V.
7) Repair of this equipment shall only be carried out by
the manufacturer or in accordance with the
applicable code of practice.
8) The certification of this equipment relies on the
following materials used in its construction:
4. INTRINSIC SAFETY CERTIFICATION
4.1 ATEX certificate
The Syrex IS-XN beacon complies with the following
standards:-
Enclosure:
Lens:
ABS Plastic
Polycarbonate
EN50014 : 1997 + A1 and A2
EN50020 : 2002
If the equipment is likely to come into contact with
aggressive substances, then it is the responsibility of
the user to take suitable precautions that prevent it
from being adversely affected, thus ensuring that the
type of protection is not compromised.
EN50284 : 1999
II 1G EEx ia IIC T4 (-40ºC <= Ta <= +60ºC)
“Aggressive substances” - e.g. acidic liquids or
gases that may attack metals, or solvents that may
affect polymeric materials.
The EC-Type Examination Certificate SIRA 05ATEX2269X
has been issued by the Notified Body Sira. This confirms
compliance with the European ATEX Directive 94/9/EC for
Group II, Category 1G equipment. The beacon carries the
Community Mark and subject to local codes of practice, may
be installed in any of the EEA member countries.
“Suitable precautions” - e.g. regular checks as part
of routine inspections or establishing from the
material’s data sheet that it is resistant to specific
chemicals.
_______________________________________________________________________________________________________________________________
Klaxon Signals Ltd. Wrigley Street, Oldham, Lancashire UK OL4 1HW
Sheet 1 of 3
Tel: +44 (0)161 287 5555
Fax: +44 (0)161 287 5511
Document No. Klaxon Syrex IS-XN Issue: A 11-11-05
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the galvanic isolator on and off, or by a mechanically
activated switch on the hazardous area side of the isolator.
6. ELECTRICAL SYSTEM DESIGN FOR INSTALLATION IN
HAZARDOUS AREAS USING ZENER BARRIERS
If the beacon is controlled by a switch in the positive supply,
or the power supply is being turned on and off, only a single
channel Zener barrier is required as shown in Fig 3. This
circuit may also be used if the beacon is being controlled by a
mechanically activated switch on the hazardous area side of
the barrier. The power supply voltage should be between 20V
and the maximum working voltage of the barrier. The circuit
will continue to work at lower voltages, but the beacon light
output level will be reduced.
Hazardous Area
Safe Area
Klaxon IS-XN
Beacon
Galvanic
Isolator
+
-
+
+
-
On / Off
Power
Supply
0V
If the beacon is being operated from a lower voltage power
supply of say 12V or less, then a 15V 100 ohm barrier can be
used which will improve the beacon light output levels at
lower voltages.
Hazardous Area
Safe Area
Fig 5 Basic circuit for use with a galvanic isolator.
Syrex IS-XN
Beacon
28V 1.2W
Positive
The control arrangement will vary depending upon the
isolator chosen. The galvanic isolator must be able to supply
an output of 30mA at about 16V.
+
-
Barrier
+
On/Off
Power
Supply
10. CABLE PARAMETERS
The maximum permitted cable parameters are as specified
on the certificate of the Zener barrier or galvanic isolator that
has been selected for the installation. Normally the limits are
not restrictive, but care should be taken not to exceed a
capacitive limit of 83nF for IIC installations when very long
cables are used.
0V
Fig 3 Using a single channel barrier.
11. BEACON FLASH RATE
If the beacon control switch is in the negative wire and the
power supply 0V is earthed, the circuit shown in Fig 4 may be
used. For simplicity the two barriers may be combined into
one package. The power supply voltage should be between
21V and the maximum working voltage of the 28V barrier.
The circuit will continue to work at lower voltages, but the
beacon brilliance will be reduced.
The Syrex IS-XN can be set to two flash rates 1 double flash
per second 1Hz (slow rate) or two double flashes per second
2Hz fast rate).
The flash rate is selected by the position of the pin header
next to the input terminal block (see fig 1).
Hazardous Area
Safe Area
12. MAINTENANCE
Syrex IS-XN
Beacon
The beacon should be regularly inspected to ensure that it
has not been damaged. Frequency of inspection depends
upon environmental conditions, but initially we recommend
that this should be done annually.
28V 1.2W
Positive
+
-
Barrier
+
Power
Supply
No attempt should be made to repair a faulty Syrex IS-XN
beacon. Suspect beacons must be returned to Klaxon
Signals Ltd. or to your local agent for repair.
Diode Return
Barrier
On/Off
0V
13. GUARANTEE
Beacons which fail within the guarantee period should be
returned to Klaxon Signals Ltd. or our local agent. It is helpful
if a brief description of the fault symptoms is provided.
Fig 4 Single stage alarm using two channel barrier.
7. ELECTRICAL SYSTEM DESIGN FOR INSTALLATION IN
HAZARDOUS AREAS USING GALVANIC ISOLATORS.
Galvanic isolators do not require a high integrity earth
connection. For small systems where a high integrity earth is
not already available, the use of galvanic isolators often
reduces the overall installation cost and simplifies design.
The Syrex IS-XN beacon may be powered by any galvanic
isolator having output parameters within the limits specified in
section 4.3, which has been certified EEx ia by an EC
Notified Body. The beacon may be controlled by turning
_______________________________________________________________________________________________________________________________
Klaxon Signals Ltd. Wrigley Street, Oldham, Lancashire UK OL4 1HW
Tel: +44 (0)161 287 5555
Fax: +44 (0)161 287 5511
Document No. Klaxon Syrex IS-XN Issue: A 11-11-05 Sheet 3 of 3
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