MEDC HORN DB3 User manual

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Technical Manual for the Speaker DB3 & DB3L
Please note that every care has been taken to ensure the accuracy of our technical manual. We do not,
however, accept responsibility for damage, loss or expense resulting from any error or omission. We reserve
the right to make alterations in line with technical advances and industry standards.

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1.0 INTRODUCTION
This range of light weight all GRP, flameproof sounders is intended for use in potentially explosive gas and
dust atmospheres and has been designed with high ingress protection to cope with the harsh environmental
conditions found offshore and onshore in the oil, gas and petrochemical industries.
The flamepaths, flare and body are manufactured completely from a UV stable glass reinforced polyester.
Stainless steel screws and sinter are incorporated thus ensuring a corrosion free product. A tapered
Flamepath is used to overcome the problems of assembly of parallel spigot flamepaths.
An Optional Exe terminal chamber is available
An uncertified version is available for use in non-explosive atmospheres.
2.0 INSTALLATION
General
When installing and operating explosion-protected equipment, requirements for selection, installation and
operation should be referred to e.g. IEE Wiring Regulations and the ‘National Electrical Code’ in North
America. Additional national and/or local requirements may apply.
Ensure that all nuts, bolts and fixings are secure.
Ensure that only the correct listed or certified stopping plugs are used to blank off unused gland entry points
and that the NEMA/IP rating of the unit is maintained. MEDC recommend the use of a sealing compound
such as HYLOMAR PL32 on the threads of glands and stopping plugs in order to maintain the IP rating of the
unit.
The unit mounts via 2 off 9mm mounting holes in the ‘U’ shaped stirrup / mounting bracket. The holes have
been designed to accept an M8 screw or bolt. If required the unit can be initially placed using the 13mm
central hole in the mounting bracket. The unit can then be rotated into the correct orientation and fixed via the
other two holes.
When the unit is fixed in the required position, its alignment can be adjusted by loosening the two M6 screws
which fasten the mounting bracket to the speaker. The speaker can then be adjusted to the required position
and the screws tightened. The unit should be positioned such that dust/debris or water cannot settle in the re-
entrant horn
MEDC recommend the use of stainless steel screws.
Cable Termination
CAUTION: Before removing the cover assembly, ensure that the power to the unit is isolated.
On Exd versions, the cover is secured with 6 off M5 cover screws (4.0mm A/F hexagon key). Once the cover
fixings are unscrewed, twist the cover assembly gently clockwise and anti-clockwise, whilst pulling it away
from the base. Remove to gain access to the interior.
On Exde versions the removable cover is secured using 2 off M5 cover screws (4.0mm A/F hexagon key).
Once the cover fixings are unscrewed, the cover can be lifted away from the enclosure to gain access to the
interior.
Ensure all non-captive fixings are kept in a safe accessible location during cable termination.
Cable termination should be in accordance with specifications applying to the required application. MEDC
recommends that all cables and cores should be correctly identified. Please refer to the wiring diagram
provided with the product.
Ensure that only the correct listed or certified cable glands are used and that the assembly is shrouded and
correctly earthed.
All cable glands should be of an equivalent NEMA/IP rating to that of the speaker and integrated with the unit
such that this rating is maintained.
The internal earth terminal, where fitted, must be used for the equipment grounding connection and the

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external terminal is for a supplementary bonding connection where local codes or authorities permit or require
such a connection.
Once termination is complete, carefully replace the cover assembly back onto the body, avoiding damage to
the mating surfaces. Replace the cover screws into the holes in the cover assembly and tighten evenly.
Ensure the O-ring is seated correctly on the cover during re-assembly. On Exd certified versions, ensure the
required maximum gap of 0.15mm is maintained between the cover and the base once assembled.
Wiring options
The unit is available in six basic configurations:
1. Exd - DC Input, single tone
2. Exde - DC input, single tone
3. Exd - DC input, dual tone
4. Exde - DC input, dual tone
5. Exd - AC input, single tone
6. Exde - AC input, single tone
Types 1 & 2 have 6 terminals labelled as T1 to T6. The supply should be connected to T1 (+ve), T3 (-ve),
loop out on T4 & T6 respectively
Types 3 & 4 have 6 terminals labelled as T1 to T6:
For a 2 wire system, the supply should be connected to T1 (+ve), T2 (-ve), loop out on T4 & T5 respectively
to produce tone 1. Tone2 is produced when the polarity of the supply is reversed T1 (-ve), T2 (+ve), loop out
on T4 & T5 respectively. Optionally an EOL resistor may be connected to T4, T5.
For a 3 wire system, the supply should be connected to T1 (common +ve), T2 (-ve 1) & T3 (-ve 2), loop out
on T4, T5 & T6 respectively. Tone 1 is produced when the supply is connected to T1 (Common +ve) & T2 (-
ve 1). Tone 2 us produced when the supply is connected to T1 (common +ve) & T3 (-ve 2). Optionally an EOL
resistor can be connected to T4, T5 or T4, T6.
Type 5 has 4 terminals labelled as L, L, N, N. The supply should be connected to one L,N pair of terminals,
loop out on the second L,N pair of terminals
Type 6 has 6 terminals labelled as T1 to T6. The supply should be connected to T1 (L), T2 (N), loop out on
T4 & T5 respectively.
3.0 OPERATION
The sounder is available in various AC input voltage versions and a single DC voltage input version.
For AC versions, the nominal operating voltage is stated on the unit label and the supply voltage tolerance is
±10%
For DC versions, the absolute input voltage range is 11.0Vdc to 58.0Vdc
The DC version can be operated as a dual-tone unit (if specified when ordering). The unit can be switched
between the two tones by either:-
a. Reversing the polarity of the supply (2 wire versions)
b. Connecting as a 3 wire common +ve system and switching between the two -ve lines.
Note: - with T1 (+ve), T2 (-ve) tone 1 is produced (as set by DIL switch ‘TONE 1’)
- with T1 (+ve) T3 (-ve) or T1 (-ve), T2 (+ve) tone 2 is produced (as set by DIL switch ‘TONE 2’)
The unit is fitted with a volume control which is positioned adjacent to the DIL switches on dc units and is
mounted on the transformer on ac units. Maximum volume is obtained when this control is turned fully
clockwise.Minimum volume is obtained when this control is turned fully anticlockwise. Please note that on
the EN54-3 compliant version the minimum sound output is 65dB
WARNING: Do not attempt to turn the volume control past its limits of movement as this may cause damage
to the unit.

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Tones
For all versions, a 5-way DIL switch selects the tone required. The settings for the standard tones are shown
in table 1 below:
Table 1
TONE
No.
TONE FREQ/DESCRIPTION
SWITCH
SETTING
12345
TONE
DESCRIPTION
Nominal SPL
(dB(A) @ 1M)
1
Alt Tones 800/970 Hz at 1/4 sec
11111
114
2
Sweeping 800/970 Hz at 7 Hz
11110
Fast Sweep (LF)
114
3*
Sweeping 800/970 Hz at 1 Hz
11101
Medium Sweep (LF)
114
4
Continuous at 2850 Hz
11100
109
5
Sweeping 2400-2850 Hz at 7 Hz
11011
Fast Sweep
114
6
Sweeping 2400-2850 Hz at 1 Hz
11010
114
7*
Slow Whoop
11001
Slow Whoop
115
8*
Sweep 1200-500 Hz at 1 Hz
11000
Din Tone
115
9
Alt Tones 2400/2850 Hz at 2 Hz
10111
111
10
Int Tone of 970 Hz at 1 Hz
10110
Back-up Alarm (LF)
114
11
Alt Tones 800/970 Hz at 7/8 Hz
10101
114
12
Int Tone at 2850 Hz at 1Hz
10100
Back-up Alarm (HF)
109
13
970 Hz at 1/4 sec on 1 sec off
10011
114
14
Continuous at 970 Hz
10010
114
15*
554 Hz for 0.1S/440 Hz for 0.4S
10001
French Fire Sound
101
16
Int 660 Hz 150 mS on 150 mS off
10000
Swedish Fire Alarm
106
17
Int 660 Hz 1.8 sec on 1.8 sec off
01111
Swedish Fire Alarm
106
18
Int 660 Hz 6.5 sec on 13 sec off
01110
Swedish Fire Alarm
104
19*
Continuous 660 Hz
01101
Swedish Fire Alarm
106
20*
Alt 554/440 Hz at 1 Hz
01100
Swedish Fire Alarm
100
21
Int 660 Hz at 7/8 Hz
01011
Swedish Fire Alarm
106
22
Int 2850 Hz 150 mS on 100 mS off
01010
Pelican Crossing
109
23
Sweep 800-970 Hz at 50 Hz
01001
Low Freq. Buzz
113
24
Sweep 2400 -2850 Hz at 50 Hz
01000
High Freq. Buzz
112
25
3x970 Hz pulses 0.5 off, 1.5 off
00111
113
26
3x2850 Hz pulses 0.5on/0.5off, 1.5 off
00110
109
27
Int 3100 Hz 0.32s on/0.68s off
00101
110
28
Spare / Customer special tone
00100
29
Spare / Customer special tone
00011
30
Spare / Customer special tone
00010
31
Spare / Customer special tone
00001
32
Spare / Customer special tone
00000
NOTE: If special tones were requested at the time of ordering, please see the separate tones list supplied
with the unit for details of these special tones and their respective switch settings.
* = EN54-3 Compliant Tones

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4.0 MAINTENANCE
During the working life of the unit, it should require little or no maintenance. GRP will resist attack by most
acids, alkalis and chemicals and is as resistant to concentrated acids and alkalis as most metal products.
However, if abnormal or unusual environmental conditions occur due to plant damage or accident etc., then
visual inspection is recommended.
If the unit requires cleaning, then only clean exterior with a damp cloth to avoid electro-static charge build up.
Repairs should be undertaken by returning the unit to MEDC or by an authorised repairer of Ex equipment. All
parts of the unit are replaceable.
If you acquired a significant quantity of units, then it is recommended that spares are also made available.
Please discuss your requirements with the Technical Sales Engineers at MEDC.

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5.0 CERTIFICATION/APPROVALS
IECEx units
Certified to IEC 60079-0, IEC 60079-1 and IEC 60079-7
Ex d IIC unit (IEC certification No. IECEx BAS 11.0083X)
Ex d IIC TG(Tamb.) Gb
Ex tb IIIC TD(Tamb.) Db IP66
Ex de IIC unit (IEC certification No. IECEx BAS 11.0084X)
Ex de IIC TG(Tamb.) Gb
Ex tb IIIC TD(Tamb.) Db IP66
The IECEx certificate and product label carry the IECEx equipment protection level marking
Gb
Db
Where Gb signifies suitability for use in a Zone 1 surface industries area in the presence of gas.
Where Db signifies suitability for use in a Zone 1 surface industries area in the presence of dust.
ATEX units
Certified to EN50014:1997, EN50018:1994, EN50019:1994 & EN50281-1-1:1998
EExd IIC Atex Certifictaion Number BAS 00ATEX2097X
EExde IIC Atex Certification Number BAS 00ATEX2098X
See special conditions for safe use for ambient temperature ranges and T-ratings
The ATEX certificate and product label carry the ATEX group and category marking:
II 2 GD
Where:
Signifies compliance with ATEX
II Signifies suitability for use in surface industries
2 Signifies suitability for use in a zone 1 area
G Signifies suitability for use in the presence of gases
D Signifies suitability for use in the presence of dust
The ATEX certificate and product label also carry the following mark:
This signifies unit compliance to the relevant European directives, in this case 94/9/EC, along with the number
of the notified body issuing the EC type examination certificate.

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EN54-3 Fire Alarm Device –Sounder (11-58V DC ABSOLUTE).
Environment Type B Outdoor applications
IP code (IP33C) to BS EN 60529:1992
This signifies unit compliance to the relevant European regulations, in this case 305/2011, along with the
name and number of the notified body issuing the certificate of conformity.
These units also have the following approvals
Electromagnetic compatibility to BS EN 50081-1:1992
BS EN 50081-2:1995
6.0 SPECIAL CONDITIONS FOR SAFE USE
a) Type DB3/DB3L - IECEx BAS 11.0083X & BAS00ATEX2097X (Exd)
1. This apparatus is not suitable for use in atmospheres containing carbon disulphide
2. This apparatus is suitable for use only in ambient temperatures as follows:
Type
Max. Power
rating
Tamb.
TG
TD
DB3
15W
-20°C to +55°C
T5
T100C
15W
-20°C to +70°C
T4
T135C
DB3L
15W
-55°C to +55°C
T5
T100C
15W
-55°C to +70°C
T4
T135C
3. Painting and surface finishes, other than those applied by the manufacturer, are not permitted
4. When used in dust atmospheres the flameproof cable entry devices or stopping plugs shall be
selected and installed to maintain the dust tight (IP6X) integrity of the enclosure
b) Type DB3E/DB3LE - IECEx BAS 11.0084X & BAS00ATEX2098X (Exe)
1. This apparatus is not suitable for use in atmospheres containing carbon disulphide.
2. Not more than one single or multiple strand wiring lead shall be connected into either side of any
terminal, unless multiple conductors have been joined in a suitable manner, e.g. two conductors into
a single insulated boot lace ferrule.
3. Leads connected to the terminals shall be insulated for at least 275V and this insulation shall extend
to within 1mm of the metal of the terminal throat.
4. All terminal screws, used and unused, shall be fully tightened down.
5. This apparatus is suitable for use only in ambient temperatures as follows:
Type
Max. Power
rating
Tamb.
TG
TD
DB3E
15W
-20°C to +55°C
T5
T100C
15W
-20°C to +70°C
T4
T135C
DB3LE
15W
-50°C to +55°C
T5
T100C
15W
-50°C to +70°C
T4
T135C
6. Minimum creepage and clearance distances between the terminals and adjacent conductive parts
(including cable entry devices) must be at least 5mm.
7. Painting and surface finishes, other than those applied by the manufacturer, are not permitted.
8. When used in dust atmospheres the flameproof cable entry devices or stopping plugs shall be
selected and installed to maintain the dust tight (IP6X) integrity of the enclosure.

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7.0 FUNCTIONAL SAFETY
Introduction
The DB3 sounder has been designed for use in potentially explosive atmospheres and harsh environmental
conditions. The glass reinforced polyester enclosures are suitable for use offshore or onshore, where light
weight combined with corrosion resistance is required.
The DB3 sounder can be configured with or without an Exe Chamber on the rear. The FMEDA has
considered the worst case scenario which includes the Exe Chamber on the rear.
The safety function of the sounder is to provide a pre-determined audible warning sound when required if the
correct voltage is applied to the unit. The DC version of the sounder is designed to operate on a supply
voltage between 12 and 48vDC; the AC versions of the sounder are designed to operate on a supply voltage
tolerance of +/- 10%.
Under No fault (Normal) Operating conditions the DB3 sounder will provide an audible warning sound when
required by the system.
Under fault conditions the failure mode of the sounder is a failure to provide an audible warning sound. For
the failure rate associated with this failure mode please refer to the table below.
Assessment of Functional Safety
This sounder is intended for use in a safety system conforming to the requirements of IEC61508.
Sira Test & certification Ltd has conducted a Failure Modes Effect and Diagnostic Analysis (FMEDA) of the
DC version of DB3 sounder against the requirements of IEC 61508-2 using a Proof Test Interval of 8760hrs.
The DC version of the sounder was considered to be the worst case. The results are shown below and are
based on Route 1H
The sounder is classed as a Type B device.
DB3 SOUNDER
Safety Function of DB3 Sounder:
‘To provide a pre-described audible warning sound when required’
Architectural constraints:
Type B
HFT=0
SFF =
74.00%
Proof Test
Interval
=8760Hrs[4]
MTTR = 8 Hrs[4]
SIL 1
Random hardware failures:
λDD = 3.25E-06
λDU = 2.15E-06
λSD = 2.20E-08
λSU = 2.81E-06
Probability of failure on demand:
PFDAVG=9.44E-03
(Low Demand Mode)
SIL 2
Probability of Dangerous failure on safety
function:
PFH = 2.15E-06
(High Demand Mode)
SIL 1
Hardware safety integrity compliance
Route 1H
Systematic safety integrity compliance
Route 1S
Systematic Capability
SC 2 (Ref to 56A24816B)
Overall SIL-capability achieved
SIL 1 (Low Demand)
SIL 1 (High Demand)

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Conditions of Safe use
The following conditions apply to the installation, operation and maintenance of the assessed equipment.
Failure to observe these may compromise the safety integrity of the assessed equipment:
1. The user shall comply with the requirements given in the manufacturer’s user documentation (This Safety
Manual and Technical manual) in regard to all relevant functional safety aspects such as application of
use, installation, operation, maintenance, proof tests, maximum ratings, environmental conditions, repair,
etc;
2. Selection of this equipment for use in safety functions and the installation, configuration, overall
validation, maintenance and repair shall only be carried out by competent personnel, observing all the
manufacturer’s conditions and recommendations in the user documentation.
3. All information associated with any field failures of this product should be collected under a
dependability management process (e.g., IEC 60300-3-2) and reported to the manufacturer.
4. The unit should be tested at regular intervals to identify any malfunctions; in accordance with this safety
manual.
0
0.002
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
0 5 10 15 20 25 30
PFDavg
Time (months)
DB3 Sounder
Selection of Proof Time Interval versus SIL % Contribution
Limited to SIL1 Due to Type B and SFF

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EN54-3 Compliant Tones Data
Minimum Volume dB(A)
Horizontal Plane
Vertical Plane
Angle
Max 58V
Min 11V
Max 58V
Min 11V
TONE 3
15°
97.4 dB(A)
95.8 dB(A)
99.1 dB(A)
97.6 dB(A)
45°
101.9 dB(A)
101.2 dB(A)
102.6 dB(A)
102.7 dB(A)
75°
106.2 dB(A)
104.9 dB(A)
106.7 dB(A)
105.6 dB(A)
105°
106.1 dB(A)
104.8 dB(A)
105.5 dB(A)
104.2 dB(A)
135°
103.4 dB(A)
102.9 dB(A)
102.7 dB(A)
101.5 dB(A)
165°
98.7 dB(A)
98.5 dB(A)
98.1 dB(A)
97.1 dB(A)
TONE 7
15°
97 dB(A)
96.5 dB(A)
98.7 dB(A)
98.5 dB(A)
45°
104.7 dB(A)
101.8 dB(A)
102.4 dB(A)
103 dB(A)
75°
105.6 dB(A)
104.5 dB(A)
106.3 dB(A)
105.3 dB(A)
105°
105.5 dB(A)
104.4 dB(A)
105.2 dB(A)
104.1 dB(A)
135°
104.8 dB(A)
103.6 dB(A)
103.8 dB(A)
103.5 dB(A)
165°
100.6 dB(A)
99.7 dB(A)
98.1 dB(A)
98.9 dB(A)
TONE 8
15°
97 dB(A)
95.9 dB(A)
95.9 dB(A)
95.1 dB(A)
45°
103.3 dB(A)
102.8 dB(A)
102.6 dB(A)
100.6 dB(A)
75°
104.6 dB(A)
103.3 dB(A)
104.1 dB(A)
103.2 dB(A)
105°
104.6 dB(A)
103 dB(A)
104.8 dB(A)
104.1 dB(A)
135°
104.4 dB(A)
105 dB(A)
106.4 dB(A)
105.9 dB(A)
165°
99.3 dB(A)
100.3 dB(A)
102.6 dB(A)
101 dB(A)
TONE 15
15°
89.7 dB(A)
88.4 dB(A)
90.4 dB(A)
89.1 dB(A)
45°
93.5 dB(A)
92.2 dB(A)
94 dB(A)
92.7 dB(A)
75°
98.5 dB(A)
97.3 dB(A)
99.1 dB(A)
97.8 dB(A)
105°
98.5 dB(A)
97.3 dB(A)
97.3 dB(A)
96.1 dB(A)
135°
93.1 dB(A)
91.6 dB(A)
92.7 dB(A)
91.1 dB(A)
165°
89 dB(A)
87.9 dB(A)
87.8 dB(A)
86.4 dB(A)
TONE 19
15°
88.6 dB(A)
86.8 dB(A)
89 dB(A)
87.8 dB(A)
45°
94.2 dB(A)
92.7 dB(A)
94.5 dB(A)
93.3 dB(A)
75°
93.1 dB(A)
91.2 dB(A)
94.4 dB(A)
93.3 dB(A)
105°
93.4 dB(A)
92.2 dB(A)
91.1 dB(A)
90.5 dB(A)
135°
94.4 dB(A)
93 dB(A)
94.3 dB(A)
93.1 dB(A)
165°
90 dB(A)
88.5 dB(A)
88.5 dB(A)
87.2 dB(A)
TONE 20
15°
89.5 dB(A)
88.4 dB(A)
90.6 dB(A)
89.3 dB(A)
45°
93.5 dB(A)
92.3 dB(A)
94 dB(A)
92.9 dB(A)
75°
98.6 dB(A)
97.3 dB(A)
99.1 dB(A)
97.9 dB(A)
105°
98.5 dB(A)
97.3 dB(A)
97.3 dB(A)
96 dB(A)
135°
93.3 dB(A)
91.9 dB(A)
92.6 dB(A)
91.5 dB(A)
165°
89 dB(A)
87.8 dB(A)
87.7 dB(A)
86.5 dB(A)

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Cooper MEDC Ltd, Unit B, Sutton Parkway, Oddicroft Lane, Sutton –In-Ashfield NG17 5FB, United Kingdom
Tel: [phone]
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Web: www.coopermedc.com
MEDC Stock No. TM141-ISS.L