The IS-mA1M sounder is CE marked for
compliance with the European
Explosive Atmospheres Directive
2014/34/EU and the European EMC
Directive 2014/30/EU
1)
Introduction
The IS-mA1M minialarm 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 is Category M1 equipment for mining
and is designed such that it can stay operational when an
explosive atmosphere is present.
2)
Description
Fig 1 shows a simplified block diagram of an IS-mA1M
minialarm 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
connected to the same power supply are started at the same
time the output tones remain synchronised.
3)
Supply Voltage
The IS-mA1M minialarm sounder has been designed to
operate in a hazardous area from a 24V dc supply via a 28V
93mA resistive ATEX and IECEx certified Zener Barrier or
Galvanic isolator. 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.
_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D251-00-051-IS
Issue 1
12-08-2022
INSTRUCTION MANUAL (ATEX)
IS-mA1M
Intrinsically Safe Round Sounder
IS-mA1M Sounder
4)
Intrinsic Safety Certification
4.1 ATEX certificate
The IS-mA1M minialarm sounder complies with the following
standards:-
EN IEC 60079-0:2018
EN60079-11:2012
EN60079-26:2014 Ed 3.0
I M1
Ex ia I Ma (-40ºC <= Ta <= +60ºC)
The EC-Type Examination Certificate SIRA 05ATEX2084X
has been issued by the Notified Body Sira. This confirms
compliance with the European ATEX Directive 2014/34/EU
for Group I, Category M1 equipment. The sounder carries
the Community Mark and subject to local codes of practice,
may be installed in any of the EEA member countries. When
designing systems for installation outside the UK, the local
Code of Practice should be consulted.
1)
The certification marking is as follows:
2)
The equipment may only be used in atmospheres
endangered by fire damp and / or coal dust. The
equipment is intended to remain functional in such
atmospheres.
3)
The equipment is only certified for use in ambient
temperatures in the range -40
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
www.e2s.com
Sheet 1 of 6
Minialarm
Volume Control
Tone Generator
Tone Selection Switches
Fig 1 Simplified block diagram
o
Tel: +44 (0)20 8743 8880
+
+
S2
S3
_
_
o
C to +60
C and
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