MEDC HORN DB3 User manual

© MEDC 2014 07/14
Technical Manual for the Sounders DB3 & DB3L
Manuel technique pour Sondeurs DB3 et DB3L
Technisches Handbuch für die Schallgeber DB3 & DB3L
Manual Técnico do Cornetas DB3 e 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.
Veuillez noter que notre manuel technique a été élaboré avec le plus grand soin pour en garantir la précision. Cependant
nous n'acceptons aucune responsabilité pour tout dommage, perte ou dépense résultant de quelque erreur ou omission
que ce soit. Nous nous réservons le droit de procéder à toutes les modifications en conformité avec les avancées techniques
et les normes industrielles.
Bitte beachten Sie: Es wurde sorgfältig auf die Richtigkeit unseres technischen Handbuchs geachtet. Wir können jedoch
keine Verantwortung für Schäden, Verluste oder Kosten aus möglichen Fehlern oder Auslassungen übernehmen. Wir be-
halten uns das Recht vor, Änderungen aufgrund von technischen Neuerungen und Industriestandards vorzunehmen.
Por favor, tenha em atenção que tivemos todo o cuidado para garantir a precisão do nosso manual técnico. No entanto,
não nos responsabilizamos por danos, perdas ou despesas resultantes de qualquer erro ou omissão. Reservamo-nos o
direito de fazer alterações conforme os avanços técnicos e padrões industriais.

07/14 © MEDC 2014

English
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 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.
© MEDC 2014 07/14

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.
WARNING: Do not attempt to turn the volume control past its limits of movement as this may cause damage to the
unit.
07/14 © MEDC 2014

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)
1Alt Tones 800/970 Hz at 1/4 sec 11111 114
2Sweeping 800/970 Hz at 7 Hz 11110 Fast Sweep (LF) 114
3Sweeping 800/970 Hz at 1 Hz 11101 Medium Sweep (LF) 114
4Continuous at 2850 Hz 11100 109
5Sweeping 2400-2850 Hz at 7 Hz 11011 Fast Sweep 114
6Sweeping 2400-2850 Hz at 1 Hz 11010 114
7Slow Whoop 11001 Slow Whoop 115
8Sweep 1200-500 Hz at 1 Hz 11000 Din Tone 115
9Alt 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.
© MEDC 2014 07/14

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.
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.
All required repairs should be undertaken by MEDC; please contact [email protected]
07/14 © MEDC 2014

These units also have the following approvals
Electromagnetic compatibility to BS EN 50081-1:1992
BS EN 50081-2:1995
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
2
G
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.
Signifies suitability for use in surface industries
Signifies suitability for use in a zone 1 area
Signifies suitability for use in the presence of gases
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.
© MEDC 2014 07/14

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. TGTD
15W -20°C to +55°C T5 T100°C
DB3 15W -20°C to +70°C T4 T135°C
15W -55°C to +55°C T5 T100°C
DB3L 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. TGTD
15W -20°C to +55°C T5 T100°C
DB3E 15W -20°C to +70°C T4 T135°C
15W -50°C to +55°C T5 T100°C
DB3LE 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.
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.
07/14 © MEDC 2014

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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© MEDC 2014 07/14

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.


EN54-3 Compliant Tones Data
Minimum Volume dB(A)
Horizontal Plane Vertical Plane
Angle Max 58V Min 11V Max 58V Min 11V
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)
TONE 3
165° 98.7 dB(A) 98.5 dB(A) 98.1 dB(A) 97.1 dB(A)
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)
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)
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)
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)
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)
TONE 7
TONE 8
TONE 15
TONE 19
TONE 20
07/14 © MEDC 2014