_______________________________________________________________________________________________________________________________
European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH sales@e2s.com Tel: +44 (0)20 8743 8880
www.e2s.com Fax: +44 (0)20 8740 4200
Document No. IS 4501 Issue G 13-01-20
Sheet 1 of 6
INSTRUCTION MANUAL
IS-A105N
Intrinsically Safe Sounder
1) Introduction
The IS-A105N is an ATEX and IECEx certified intrinsically
safe sounder which produces a loud warning signal in a
hazardous area. Forty-nine first stage alarm sounds can be
selected by internal switches and each one can be externally
changed to a second or third stage alarm sound. The
sounder may be used in all gas groups IIA, IIB and IIC. The
IS-A105N sounder may be used in conjunction with an IS-
L101L intrinsically safe beacon, allowing a combined audible
and visual alarm to be constructed.
2) Description
Fig 1 shows a simplified block diagram of an IS-A105N
sounder. The device operates immediately power is applied
to the + and – terminals which are duplicated to allow a
second sounder to be connected in parallel, or for an end of
line monitoring resistor to be installed. The output tone is
defined by the positions of the six internal switches and this
tone can be changed to a second or third stage alarm tone by
connecting terminals S2 or S3 to 0V. The tone generator is
crystal controlled to ensure that when two sounders are
started at the same time the output tones remain
synchronised.
3)
Supply Voltage
The IS-A105N sounder has been designed to operate in a
hazardous area from a 24V dc supply via 28V 93mA resistive
ATEX and IECEx certified Zener Barriers or Galvanic
Isolators. The sounders 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
therefore it is recommended that they are not operated
continuously with a direct supply greater than 16V.
-
-
IS-A105N Sounder
Volume Control
Tone Selection Switches
Tone Generator
+
+
S2
S3
Fig 1 Simplified block diagram
4)
Intrinsic Safety Certification
4.1 ATEX certificate
The IS-A105N sounder complies with the following
standards:-
EN IEC 60079-0:2018
EN60079-11:2012
The EC-Type Examination Certificate SIRA 04ATEX2301X
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 sounder carries the
Community Mark and subject to local codes of practice, may
be installed in any of the EEA member countries. This
instruction sheet describes installations which conform to
EN60079:Part14:2008 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:
e
2S
european safety systems ltd.
SIRA 04ATEX2301X
2813
IS-A105N Sounder
London W3 7QH UK
www.e2s.com
Year / Serial No.
09 / 1S00001
WARNINGS:
IECEx SIR 04.0038X
Term. + w.r.t. Term. - Ui = 28V Ii = 93mA
Pi = 660mW Ci = 0 Li = 0
Term. S2&S3 w.r.t. Term. - Ui = 28V Ii = 0mA
FM
APPROVED
To avoid a possible electrostatic
charge only clean with a damp cloth
To prevent ignition of flammable or combustible
atmospheres, disconnect power before servicing
Substitution of components may impair safety
IS Class I, Zone 0, AEx ia IIC T4
IS Class l, Division 1, Groups A, B, C, D
II 1G Ex ia IIC T4 Ga (-40ºC <=Ta<= +60°C)
Control Drawing No. D 4528
The IS-A105N sounder is CE marked for
compliance with the European
Explosive Atmospheres Directive
94/9/EC and the European EMC
Directive 89/336/EEC
II 1G Ex ia IIC T4 Ga (-40ºC <= Ta <= +60ºC)
