E2S IS-AL105NL User manual

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH sale[email protected] Tel: [phone]
www.e2s.com Fax: [phone]
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)

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e2s.com Fax: [phone]
Document No. IS 4501 Issue G 13-01-20 Sheet 2 of 6
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.
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.
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:
Enclosure: ABS Plastic
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.
“Aggressive substances” - e.g. acidic liquids or
gases that may attack metals, or solvents that may
affect polymeric materials.
“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.
SPECIAL CONDITIONS FOR SAFE USE (as stated on the
EC Type Examination Certificate SIRA 04ATEX2301X)
The equipment shall only be supplied via Terminals + w.r.t.
Terminals - from a barrier having a maximum open circuit
voltage Uo that is < 28 V and a maximum short circuit current
Io that is < 93 mA, where Io is resistively limited. The barrier
shall be ATEX certified by a notified body.
The total capacitance connected to terminals + wrt – (i.e. the
capacitance of the cable plus any other capacitance) shall
not exceed 83nF.
The enclosure is non-conducting and may generate an
ignition-capable level of electrosatic 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,
additionally, cleaning of the equipment should be done only
with a damp cloth.
The equipment has an ingress protection rating of IP66;
however, if it has been supplied without a cable entry device,
then the user shall ensure that the device that is fitted will
provide an ingress protection that is appropriate to the
environment in which it is installed i.e. IP20 or better.
4.2 Zones, Gas Groups and Temperature Classification
The IS-A105N sounder has been certified Ex ia IIC T4 Ga.
When connected to an approved system it may be installed
in:
Zone 0 explosive gas air mixture
continuously present.
Zone 1 explosive gas air mixture likely to occur in
normal operation.
Zone 2 explosive gas air mixture not likely to occur,
and if it does, it will only exist for a short time.
Be used with gases in groups:
Group A propane
Group B ethylene
Group C hydrogen
Having a temperature classification of:
T1 450ºC
T2 300ºC
T3 200ºC
T4 135ºC
4.3 Terminals + and -
Power is supplied to the sounder via the + and – terminals
which have the following input safety parameters:
Ui = 28V
Ii = 93mA
Pi = 660mW
Ci = 0 Li = 0
The IS-A105N sounder may be powered from an ATEX
certified Zener barrier or galvanic isolator which have output
parameters equal to or less than 28V, 93mA and 660mW
where Io is resistively limited. The cable parameters stated
on the selected Zener barrier or galvanic isolator certificate
must be observed.
Up to three IS-A105N sounders can be connected in parallel
and powered from a common barrier or isolator. Connecting
two sounders in parallel will reduce the output from each by
about 3dB. Three sounders should only be powered from a
common supply when the maximum supply voltage is
available.
4.4 Terminals S2 and S3
When terminals S2 or S3 are connected to 0V (- terminal) the
sounder output tone changes to the second or third stage
alarm respectively. The input safety parameters for these
terminals are:
Ui = 28V
Ii = 0mA
Because the permitted input current is zero, these terminals
may only be connected to a diode return barrier, an

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e2s.com Fax: [phone]
Document No. IS 4501 Issue G 13-01-20 Sheet 3 of 6
intrinsically safe relay or a galvanic isolator, all of which must
have been certified by an EC Notified Body. Only diode
return barriers with a voltage drop of less than 0.9V may be
used. Alternatively, these terminals may be connected
directly to a mechanically activated switch within the
hazardous area.
+ + - - S2 S3 1 2 3 4 5 6
Input Terminals Volume
Control
Tone Setting
Switches 1-6
ON
Fig 2 Location of field terminals and controls.
4.5 Other intrinsic safety certifications
Please contact European Safety Systems Ltd. for details of
non-European intrinsic safety approvals.
5) Installation
IS-A105N sounders should only be installed by trained
competent personnel.
5.1 Mounting
The IS-A105N sounder may be secured to any flat surface
using the two 7mm diameter fixing holes. The enclosure
provides IP66 protection and is suitable for installation in
exterior locations providing it is positioned so that water can
not collect in the horn, and the cable entry is sealed.
5.2 Installation procedure
a. Secure the IS-A105N sounder to a flat surface via the
two 7mm dia fixing holes in the mounting feet.
b. Remove the front of the sounder by unscrewing the
four captive ‘A’ screws and pulling the front away from
the enclosure.
c. Fit a 20mm cable gland or conduit entry into the
untapped hole in the enclosure and connect the field
wiring to the appropriate sounder terminals as shown
in section 6 and fig 2 of this manual. The power supply
terminals + and - are duplicated so that sounders may
be connected in parallel, or an end of line monitoring
resistor may be fitted.
d. Select the required output tone by positioning the six
switches as shown in Table 1 and Fig 2.
e. Apply power to the sounder and adjust the internal
volume control to provide the required sound level.
f. Replace the front of the sounder and tighten the four
‘A’ screws.
6) Electrical System Design For Installation In
Hazardous Areas Using Zener Barriers
6.1 Single stage alarm
If the control switch is 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 sounder is being controlled by a mechanically
activated switch on the hazardous area side of the barrier.
Power
Supply
+
0V
Barrier
On/Off
IS-A105N
Sounder
+
-
28V 93mA
Positive
Hazardous Area Safe Area
Fig 3 Single stage alarm using single channel barrier.
If the control switch must be in the negative supply, the circuit
shown in Fig 4 may be used. Any diode return barrier certified
Ex ia by a EC Notified Body may be used, providing its
voltage drop is less than 0.9V.
Power
Supply
+
0V
Barrier
IS-A105N
Sounder
+
-
28V 93mA
Positive
Hazardous Area Safe Area
Diode Return
Barrier On/Off
Fig 4 Single stage alarm using two channel barrier.
6.2 Multi-stage alarm
Connecting terminal S2 to 0V activates the second stage
alarm, and similarly terminal S3 for the third stage alarm. Fig
5 shows how the diode return barriers may be used. If only
two stages of alarm are required the third stage barrier
should be omitted, the 28V 93mA barrier and the single diode
return channel may then be contained in one package.
Power
Supply
+
0V
Barrier
IS-A105N
Sounder
+
-
28V 93mA
Positive
Hazardous Area Safe Area
Diode Return
Barrier 2nd Stage
On/Off
Diode Return
Barrier 3rd Stage
S2
S3
Fig 5 Multi stage alarm using Zener barriers.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e2s.com Fax: [phone]
Document No. IS 4501 Issue G 13-01-20 Sheet 4 of 6
Tone
Number
Tone Description
Switch
Settings
1 2 3 4 5 6
Second
Stage
Alarm
Third
Stage
alarm
Tone 1
Tone 2
Tone 3
Tone 4
Tone 5
Tone 6
Tone 7
Tone 8
Tone 9
Tone 10
Tone 11
Tone 12
Tone 13
Tone 14
Tone 15
Tone 16
Tone 17
Tone 18
Tone 19
Tone 20
Tone 21
Tone 22
Tone 23
Tone 24
Tone 25
Tone 26
Tone 27
Tone 28
Tone 29
Tone 30
Tone 31
Tone 32
Tone 33
Tone 34
Tone 35
Tone 36
Tone 37
Tone 38
Tone 39
Tone 40
Tone 41
Tone 42
Tone 43
Tone 44
Tone 45
Tone 46
Tone 47
Tone 48
Tone 49
Continuous 340Hz
Alternating 800/1000Hz @ 0.25s intervals
Slow whoop 500/1200Hz @ 0.3Hz with 0.5s gap repeated
Sweeping 500/1000Hz @ 1Hz
Continuous 2400Hz
Sweeping 2400/2900Hz @ 7Hz
Sweeping 2400/2900Hz @ 1Hz
Siren 500/1200/500Hz @ 0.3Hz
Sawtooth 1200/500Hz @ 1Hz - D.I.N.
Alternating 2400/2900Hz @ 2Hz
Intermittent 1000Hz @ 1Hz
Alternating 800/1000Hz @ 0.875Hz
Intermittent 2400Hz @ 1Hz
Intermittent 800Hz 0.25s ON, 1s OFF
Continuous 800Hz
Intermittent 660Hz 150Ns ON, 150ms OFF
Alternating 544Hz (100ms) / 440Hz (400ms) – NFS 32-001
Intermittent 660Hz 1.8s ON, 1.8s OFF
Sweep 1400Hz to1600Hz up 1s 1600Hz to 1400Hz down 0.5s
Continuous 660Hz
Alternating 554/440Hz @ 1Hz
Intermittent 544Hz @ 0.875Hz
Intermittent 800Hz @ 2Hz
Sweeping 800/1000Hz @ 50Hz
Sweeping 2400/2900Hz @ 50Hz
Simulated bell
Continuous 554Hz
Continuous 440Hz
Sweeping 800/1000Hz @ 7Hz
Continuous 300Hz
Sweeping 660/1200 @ 1Hz
Two Tone Chime
Intermittent 745Hz
Alternating 1000/2000Hz @ 0.5s – Singapore
420Hz @ 0.625s - Australian Alert
500-1200Hz 3.75s / 0.25s - Australian Evacuate
Continuous 1000Hz
Continuous 2000Hz
Intermittent 800Hz 0.25s ON 1s OFF
Alternating 544Hz (100ms) / 440Hz (400ms) – NFS 32-001
Motor Siren – Slow rise to 1200Hz
Motor Siren – Slow rise to 800Hz
Continuous 1200Hz
Motor Siren – Slow rise to 2400Hz
Intermittent 1000Hz 1s ON, 1s OFF
Sawtooth 1200/500Hz @ 1Hz - D.I.N. (PFEER P.T.A.P)
Intermittent 1000Hz 1s ON, 1s OFF – PFEER General Alarm
420Hz @ 0.625s - Australian Alert
500-1200Hz 3.75s / 0.25s - Australian Evacuate
0 0 0 0 0 0
1 0 0 0 0 0
0 1 0 0 0 0
1 1 0 0 0 0
0 0 1 0 0 0
1 0 1 0 0 0
0 1 1 0 0 0
1 1 1 0 0 0
0 0 0 1 0 0
1 0 0 1 0 0
0 1 0 1 0 0
1 1 0 1 0 0
0 0 1 1 0 0
1 0 1 1 0 0
0 1 1 1 0 0
1 1 1 1 0 0
0 0 0 0 1 0
1 0 0 0 1 0
0 1 0 0 1 0
1 1 0 0 1 0
0 0 1 0 1 0
1 0 1 0 1 0
0 1 1 0 1 0
1 1 1 0 1 0
0 0 0 1 1 0
1 0 0 1 1 0
0 1 0 1 1 0
1 1 0 1 1 0
0 0 1 1 1 0
1 0 1 1 1 0
0 1 1 1 1 0
1 1 1 1 1 0
0 0 0 0 0 1
1 0 0 0 0 1
0 1 0 0 0 1
1 1 0 0 0 1
0 0 1 0 0 1
1 0 1 0 0 1
0 1 1 0 0 1
1 1 1 0 0 1
0 0 0 1 0 1
1 0 0 1 0 1
0 1 0 1 0 1
1 1 0 1 0 1
0 0 1 1 0 1
1 0 1 1 0 1
0 1 1 1 0 1
1 1 1 1 0 1
0 0 0 0 1 1
Tone 2
Tone 17
Tone 2
Tone 6
Tone 3
Tone 7
Tone 10
Tone 2
Tone 15
Tone 7
Tone 2
Tone 4
Tone 15
Tone 4
Tone 2
Tone 18
Tone 2
Tone 2
Tone 2
Tone 2
Tone 2
Tone 2
Tone 6
Tone 29
Tone 29
Tone 2
Tone 26
Tone 2
Tone 7
Tone 2
Tone 26
Tone 26
Tone 2
Tone 38
Tone 36
Tone 35
Tone 9
Tone 34
Tone 23
Tone 31
Tone 2
Tone 2
Tone 2
Tone 2
Tone 38
Tone 47
Tone 46
Tone 49
Tone 26
Tone 5
Tone 5
Tone 5
Tone 5
Tone 20
Tone 5
Tone 5
Tone 5
Tone 2
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 27
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 15
Tone 5
Tone 5
Tone 5
Tone 5
Tone 5
Tone 15
Tone 5
Tone 45
Tone 5
Tone 5
Tone 45
Tone 45
Tone 17
Tone 27
Tone 5
Tone 5
Tone 5
Tone 5
Tone 34
Tone 37
Tone 37
Tone 5
Tone 37
Tone Selection – To select the required first stage tone set the tone switches 1 to 6 (see
Fig 2) to the tone setting shown in the table below. The table also shows which 2nd and 3rd
stage tones are available for use with the selected first stage tone if more than one tone
output sta
g
e is required.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e2s.com Fax: [phone]
Document No. IS 4501 Issue G 13-01-20 Sheet 5 of 6
7) Electrical System Design For Installation In
Hazardous Areas Using Galvanic Isolators
Galvanic isolators although more expensive than Zener
barriers, 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.
7.1 Single stage alarm
The IS-A105N sounder may be powered by any galvanic
isolator having output parameters within the limits specified in
section 4.3, which has been certified Ex ia by an EC Notified
Body. The sounder may be controlled by turning the galvanic
isolator on and off, or by a mechanically activated switch on
the hazardous area side of the isolator.
+
IS-A105N
Sounder
+
-
Hazardous Area Safe Area
-Power
Galvanic
Isolator
Fig 6 Single stage alarm using galvanic isolator.
7.2 Multi stage alarm
The IS-A105N sounder second and third stages may be
activated by using Galvanically Isolated Relays that have
output parameters within the limits specified in section 4.4.
which have been certified Ex ia by an EC Notified Body.
Safe Area
Hazardous Area
-
S2
IS-A105N
Sounder
+
-
Galvanic Isolated Relay
-
Galvanic Isolator
+
Power
Power
Fig 7 Multi stage alarm using galvanic isolated relays
8) 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 installations when very long cables
are used.
9) Volume Control
The output level of the IS-A105N sounder can be set by
adjusting the volume control potentiometer (see Fig 2).
10) Servicing
No attempt should be made to repair a faulty IS-A105N
sounder. Suspect sounders should be returned to European
Safety Systems Ltd. for repair.
11) Guarantee
Sounders that fail within the guarantee period should be
returned to European safety Systems Ltd. It is helpful if a
brief description of the fault symptoms is provided.
12) Customer Comments
European Safety Systems Ltd. is always pleased to receive
comments from customers about our products and services.
All communications are acknowledged and whenever
possible, suggestions are implemented.

_______________________________________________________________________________________________________________________________
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH [email protected] Tel: [phone]
www.e2s.com Fax: [phone]
Document No. IS 4501 Issue G 13-01-20 Sheet 6 of 6
The IS-A105N Sounder has also been approved to the IECEx
scheme.
The installation requirements for IS-A105N sounders
approved to the IECEx scheme are the same as the
installation requirements for IS-A105N sounders approved to
the ATEX directive.
Certificate No. IECEx SIR 04.0038X
Marking: Ex ia IIC T4 Ga (Ta = -40ºC to +60ºC)
Standards: IEC 60079-0:2017
IEC 60079-11:2011
CONDITIONS OF CERTIFICATION (as stated on the IECEx
Certificate of Conformity IECEx SIR 04.0038X)
1. The equipment shall only be supplied via Terminals
+ w.r.t. Terminals - from a certified barrier having a
maximum open circuit voltage Uo that is less than or
equal to 28 V and a maximum short circuit current Io
that is less than or equal to 93 mA, where Io is
resistively limited.
2. The total capacitance connected to terminals + wrt –
(i.e. the capacitance of the cable plus any other
capacitance) shall not exceed 83nF.
3. The equipment has an ingress protection rating of
IP66; however, if it has been supplied without a
cable entry device, then the user shall ensure that
the device that is fitted will provide an ingress
protection that is appropriate to the environment in
which it is installed i.e. IP20 or better.
4. The enclosure is non-conducting and may generate
an ignition-capable level of electrosatic 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,
additionally, cleaning of the equipment should be
done only with a damp cloth.
The IS-A105N Sounder has also been FM Listed.
Marking: IS Class I, Zone 0, AEx ia IIC T4
IS Class I, Division 1, Groups A, B, C, D
See the Control Drawings D 4528 Sheets 1 and 2 for
installation details and entity parameters.
The IS-A105N sounders are marked with the certification
requirements for the ATEX, IECEx and FM approvals.
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
IECEx Certification FM Approval

Date:
Drawn:
Issue: Appd. Date:
European Safety Systems Ltd. Impress House Mansell Road
Acton
London W3 7QH
D 4528 Sheet 1 of 2
D 4528a.dwg
19-10-05
GU
17-02-06MRSA
2S
warning signals
Hazardous (Classified) Location
Class I, Division 1, Groups A, B, C, D
Class I, Zone 0, Groups IIA, IIB, IIC
IS-A105N Sounder IS Class I, Zone 0, AEx ia IIC T4
(−40°C ≤Ta≤+60°C) Entity Parameters:
Terminals +w.r.t. −
Ui= 28V
Ii= 93mA
Pi= 660mW
Ci= 0
Li= 0
Terminals S2 & S3 w.r.t. -
Ui= 28V
Ii= 0
Ci = 0
Uo = 16.8V
Io = 7.3mA
Po = 31mW
Unclassified Location
Associated Apparatus - Shunt Zener Diode
Barrier with Entity Parameters: Uo≤28V
Io≤93mA
Po≤660mW
Co≥Ccable (see note 10)
Lo≥Lcable
Associated Apparatus - Diode Return Barrier with Entity Parameters:
Uo≤28V
Io= 0
Co≥Ccable
Associated Apparatus - Diode Return Barrier with Entity Parameters:
Uo≤28V
Io= 0
Co≥Ccable
+
-
S2
S3
1. No revision to drawing without prior FM approval.
2. The associated apparatus must be FM approved.
3. The associated apparatus manufacturer's installation drawing must
be followed when installing this equipment.
4. Installation should be in accordance with ANSI/ISA RP12.06.01
"Installation of Intrinsically Safe Systems for Hazardous (Classified)
Locations" and the National Electrical Code (ANSI/NFPA 70).
5. The resistance between the intrinsically safe ground and the earth
ground must be less the 1 ohm.
6. The Shunt Zener Diode Barrier must be a FM approved, resistively
limited, single channel barrier having parameters less than, or equal
to, those quoted, and for which the output is non-ignition capable for the Class, Division or Zone and Group of use.
7. The IS-A105N Sounder enclosure has an ingress protection rating of IP 66. If supplied without cable entry devices then metallic or plastic cable glands, or conduit hubs, shall be fitted that provide the required environmental protection. 8. To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing. 9. Substitution of components may impair safety.
10. The total capacitance connected to terminals +/- of the sounder,
i.e. Ccable plus any other capacitance, shall not exceed 83nF. Notes:
CAUTION - Bonding between conduit connections is not automatic and must be provided as part of this installation. CAUTION - The clearance between sounder terminals S2 and S3 is
less than 6mm.
Drawing No. Computer Ref.
IS-A105N Sounder
Control Drawing for shunt zener
diode barrier / diode return barrier.
Title
SCHEDULE DRAWING
No modification permitted
without reference to the
"Notified Body"

Date:
Drawn:
Issue: Appd. Date:
European Safety Systems Ltd. Impress House Mansell Road
Acton
London W3 7QH
19-10-05
GU
17-02-06MRS
A
2S
warning signals
Hazardous (Classified) Location
Class I, Division 1, Groups A, B, C, D
Class I, Zone 0, Groups IIA, IIB, IIC
Unclassified Location
Associated Apparatus - Galvanically Isolated
Supply with Entity Parameters:
Uo≤28V
Io≤93mA
Po≤660mW
Co≥Ccable (see note 9)
Lo≥Lcable
Associated Apparatus - Galvanically Isolated
Relay with Entity Parameters: Uo= 0
Io= 0
Associated Apparatus - Galvanically Isolated
Relay with Entity Parameters: Uo= 0
Io= 0
(See Note 10)
+
-
1. No revision to drawing without prior FM approval.
2. The associated apparatus must be FM approved. 3. The associated apparatus manufacturer's installation drawing must
be followed when installing this equipment.
4. Installation should be in accordance with ANSI/ISA RP12.06.01
"Installation of Intrinsically Safe Systems for Hazardous (Classified) Locations" and the National Electrical Code (ANSI/NFPA 70).
5. The Galvanically Isolated Supply must be a FM approved,
resistively limited, single channel supply having parameters less than,
or equal to, those quoted, and for which the output is non-ignition capable for the Class, Division or Zone and Group of use. 6. The IS-A105N Sounder enclosure has an ingress protection rating of IP 66. If supplied without cable entry devices then metallic or plastic cable glands, or conduit hubs, shall be fitted that provide the required environmental protection.
7. To prevent ignition of flammable or combustible atmospheres,
disconnect power before servicing. 8. Substitution of components may impair safety. 9. The total capacitance connected to terminals +/- of the sounder, i.e.
Ccable plus any other capacitance, shall not exceed 83nF.
10. The Ccable and Lcable of the cables connecting the galvanically
isolated relays to sounder terminals S2/- and S3/- shall be less than,
or equal to, the C cable and Lcable of the cable connecting the galvanically isolated supply to sounder terminals +/-.
Notes:
CAUTION - Bonding between conduit connections is not automatic
and must be provided as part of this installation.
CAUTION - The clearance between sounder terminals S2 and S3 is less than 6mm.
S2
-
S3
-
IS-A105N Sounder
Control Drawing for galvanically isolated supply / isolated relay installation. D 4528 Sheet 2 of 2
D 4528b.dwg
Drawing No. Computer Ref.
Title
IS-A105N Sounder IS Class I, Zone 0, AEx ia IIC T4
(−40°C ≤Ta≤+60°C) Entity Parameters:
Terminals +w.r.t. −
Ui= 28V
Ii= 93mA
Pi= 660mW
Ci= 0
Li= 0
Terminals S2 & S3 w.r.t. -
Ui= 28V
Ii= 0
Ci = 0
Uo = 16.8V
Io = 7.3mA
Po = 31mW
SCHEDULE DRAWING
No modification permitted
without reference to the
"Notified Body"