BEKA BA385-IIB User manual

Instruction sheet for BA385-IIB and BA385-IIC
Intrinsically safe Sounders
1. INTRODUCTION
The BA385-IIB and BA385-IIC are second generation ATEX certified
intrinsically safe sounders which produce a loud warning signal in a
hazardous area. Thirty two different 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 IIB model, which may be used
with gases in groups IIA and IIB, has slightly more output than the IIC
model which may be used with gases in all groups.
2. DESCRIPTION
Fig 1 shows a simplified block diagram of a BA385 sounder. The device
operates immediately power is applied to terminals 1 and 4 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 position of the five internal switches and this tone can be changed
to a second or third stage alarm tone by connecting terminal 2 or 3 to 0V.
The tone generator is crystal controlled to ensure that when two sounders
are started at the same time their output tones remain synchronised.
3. SUPPLY VOLTAGE
For hazardous area installations, BA385 sounders must be powered from
a certified Zener barrier or galvanic isolator that will supply between 8 and
28V between terminals 1 and 4. 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 the audio output will
be reduced. Direct connection to supplies up to 30V of either polarity will
not damage the sounder, but it is recommended that sounders are not
operated continuously with a direct supply greater than 16V.
Fig 1 Simplified block diagram
4. INTRINSIC SAFETY CERTIFICATION
4.1 ATEX certificate
Both the BA385-IIB and the BA385-IIC sounders comply with EN50 014 &
EN50 020 and they have been issued with EC-Type Examination
Certificates BAS00ATEX1180 and 1181. This confirms compliance with
the European ATEX Directive 94/9/EC for Group II, Category 1G
equipment. The sounders carry the Community Mark and subject to local
codes of practice, may be installed in any of the European Economic Area
(EEA) member countries. i.e. Austria, Belgium, Denmark, Finland,
France, Germany, Greece, Ireland, Italy, Luxembourg, Norway, The
Netherlands, Portugal, Spain, Sweden and the United Kingdom. ATEX
certificates are also accepted in Iceland, Liechtenstein, Switzerland and
in the Czech Republic. This instruction sheet describes installations
which conform with BS EN60079:Part14:1997 Electrical Installation in
Hazardous Areas. When designing systems for installation outside the
UK, the local Code of Practice should be consulted.
BA385 sounders employ good engineering practice to minimise the risk of
injury to installers and users.
4.2 Zones, Gas Groups and T rating
The BA385-IIB sounder has been certified EEx ia IIB T4 and the
BA385-IIC model EEx ia IIC T4. When connected to approved Zener
barriers or galvanic isolators they 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:
Model BA385-IIB Model BA385-IIC
Group A propane yes yes
Group B ethylene yes yes
Group C hydrogen no yes
Having a temperature classification of:
T1 450ºC
T2 300ºC
T3 200ºC
T4 135ºC
Although certified intrinsically safe at ambient temperatures between –40
and +60ºC the operating temperature range of both sounders is –20 to
+60ºC.
The BA385-IIB and BA385-IIC sounders are CE
marked to show compliance with the European
Explosive Atmospheres Directive 94/9/EC and the
European EMC Directive 89/336/EEC
BEKA associates Ltd, Old Charlton Road, Hitchin, Herts. UK SG5 2DA. Tel: [phone] www.beka.co.uk

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4.3 Certification label information
The certification label is fitted on the side of the sounder. It shows the
model number, ATEX certification information and BEKA associates
address. The year of manufacture and the sounder serial number are
shown on a separate label within the enclosure.
In addition to ATEX certification information, the label also shows Factory
Mutual approval information – see Appendix 1. Certification information
from other authorities may also be shown.
WARNING
To prevent generation of an electrostatic charge do
not rub, and to prevent damage to the enclosure do
not clean with a solvent.
4.4 Terminals 1 & 4
Power is supplied to the sounder via terminals 1 & 4 which have the
following maximum input safety parameters:
Ui = 28V
Ii = 110mA dc
Pi = 0.8W
BA385 sounders may be powered from any Zener barrier or galvanic
isolator having output parameters equal to, or less than, these limits which
has been certified EEx ia IIC by an EC Notified Body. e.g. a certified
28V, 93mA, 0.65W Zener barrier or isolator may be used. Cable
parameters are defined by the certificate for the Zener barrier or galvanic
isolator
Up to three BA385 sounders may be connected in parallel and powered
from a common barrier or isolator providing the voltage between terminals
1 and 4 does not fall below 8V. Connecting two sounders in parallel will
reduce the output from each sounder by about 3dB.
4.5 Terminals 2 & 3
When terminals 2 or 3 are connected to 0V (terminal 4) 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
For control from the hazardous area the terminals may be connected to a
mechanically operated switch in the hazardous area complying with the
requirements for simple apparatus - Clause 5.4 of EN50 020. i.e. having
IP20 protection and able to withstand a 500V rms insulation test to earth
for one minute.
For control from the safe area terminals 2 & 3 may be connected to a
certified diode return barrier, or the contacts of a certified intrinsically safe
relay. Only diode return barriers with a voltage drop of less than 0.9V
may be used.
5. INSTALLATION
BA385 sounders should only be installed by trained competent personnel.
5.1 Mounting
The BA385 sounder may be secured to any flat surface using the two
7mm diameter fixing holes. The enclosure provides IP65 protection and is
suitable for installation in sheltered 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 BA385 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
corner 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 Fig 3. The power supply terminals
1 and 4 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 five switches as
shown in Table 1 and Fig 3. The sixth switch on the right hand
side of the switch assembly is not used.
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 corner
screws.
Fig 2 Enclosure

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Fig 3 Location of field terminals and controls.
Tone
Number
Tone description
Switch
Settings
1 2 3 4 5
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
Continuous 1000Hz Toxic gas alarm
Alternating 800/1000Hz at 0.25s intervals
Slow whoop 500/1200Hz at 0.3Hz
with 0.5s gap repeated
Sweeping 500/1000Hz at 1Hz
Continuous 2400Hz
Sweeping 2400/2900Hz at 7Hz
Sweeping 2400/2900Hz at 1Hz
Siren 500/1200/500Hz at 0.3Hz
Sawtooth 1200/500Hz at 1Hz
Alternative 2400/2900Hz at 2Hz
Intermittent 1000Hz at 0.5Hz General
Alarm
Alternating 800/1000Hz at 0.875Hz
Intermittent 2400Hz at 1Hz
Intermittent 800Hz 0.25s on, 1s off
Continuous 800Hz
Intermittent 550Hz 150nS on, 150ms off
Alternating 544Hz (100ms) /
440Hz (400ms)
Intermittent 660Hz 1.8s on, 1.8s off
1400Hz to 1600Hz sweep up over 1s
1600Hz to 1400Hz sweep down over 0.5s
Continuous 660Hz
Alternating 554/440Hz at 1Hz
Intermittent 544Hz at 0.875Hz
800Hz pulsing at 2Hz
Sweeping 800/1000Hz at 50Hz
Sweeping 2400/2900Hz at 50Hz
Simulated bell
Continuous 554Hz
Continuous 440Hz
Sweeping 800/1000Hz at 7Hz
420Hz repeating 0.625s off
Australian alert signal
1200/400Hz at 1Hz
Prepare to abandon platform
Sweeping 500/1200Hz 3.75s on, 0.25off
15Hz Australian evacuation signal
0 0 0 0 0
1 0 0 0 0
0 1 0 0 0
1 1 0 0 0
0 0 1 0 0
1 0 1 0 0
0 1 1 0 0
1 1 1 0 0
0 0 0 1 0
1 0 0 1 0
0 1 0 1 0
1 1 0 1 0
0 0 1 1 0
1 0 1 1 0
0 1 1 1 0
1 1 1 1 0
0 0 0 0 1
1 0 0 0 1
0 1 0 0 1
1 1 0 0 1
0 0 1 0 1
1 0 1 0 1
0 1 1 0 1
1 1 1 0 1
0 0 0 1 1
1 0 0 1 1
0 1 0 1 1
1 1 0 1 1
0 0 1 1 1
1 0 1 1 1
0 1 1 1 1
1 1 1 1 1
Tone 31
Tone 17
Tone 2
Tone 6
Tone 3
Tone 7
Tone 10
Tone 2
Tone 15
Tone 7
Tone 31
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 32
Tone 11
Tone 26
Tone 11
Tone 5
Tone 5
Tone 5
Tone 27
Tone 5
Tone 5
Tone 5
Tone 2
Tone 5
Tone 1
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 1
Tone 5
Tone 5
Tone 5
Tone 5
Tone 1
Tone 1
Table 1 Function of tone selection switches
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 4. This circuit may also be used if the sounder is being
controlled from the hazardous area by a mechanically activated switch
complying with the requirements for simple apparatus. See 4.5
Fig 4 Single stage alarm using single channel barrier.
If the negative side or the power supply and one side of the control switch
are earthed, the circuit shown in Fig 5 may be used.
Fig 5 Single stage alarm using two channel barrier.
6.2 Multi-stage alarm
Connecting terminal 2 to 0V activates the second stage alarm, and
similarly terminal 3 for the third stage alarm. Fig 6 shows how diode return
barrier(s) may be used to control the sounder from the safe area. If only
two stages of alarm are required the third stage barrier should be omitted,
the 28V 300ohm barrier and the single diode return channel may then be
contained in one package.
Fig 6 Multi stage alarm using Zener barriers.
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 BA385-IIB and the BA385-IIC sounders may be powered by any EEx
ia certified galvanic isolator having output parameters within the limits
specified in section 4.4. The sounder may be controlled by turning the
galvanic isolator on and off, or from the hazardous area by a mechanically
activated switch complying with the requirements for simple apparatus.
See 4.5

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Fig 7 Single stage alarm using galvanic isolator.
7.2 Multi-stage alarm
Fig 8 shows a typical application in which the first and second stage alarm
tones are activated by the alarm outputs of a BA327C intrinsically safe
loop powered indicator. The BA327C alarm outputs have been certified as
simple apparatus and may therefore be used to switch the BA385 sounder
in the hazardous area. The contacts of most certified intrinsically safe
relays may also be used in the same way.
Fig 8 Loop-powered BA327C intrinsically safe indicator
activating BA385 first and second stage alarms
8. CABLE PARAMETERS
The BA385 has zero total equivalent capacitance and inductance Ci and
Li. The maximum permitted cable parameters specified on the certificate
for the barrier or isolator connected to the sounder therefore apply.
normally these limits are not restrictive. Only the maximum permitted
capacitance in IIC applications is likely to limit practical cable length.
9. ACCESSORIES
9.1 Tag number
The BA385-IIB and BA385-IIC sounders can be supplied identified by a
tag number thermally printed on a self adhesive label.
10. Servicing
No attempt should be made to repair a faulty BA385-IIB or BA385-IIC
sounder. Suspect sounders should be returned to BEKA associates or
our local agent for repair.
11. Guarantee
Sounders which fail within the guarantee period should be returned to
BEKA associates or our local agent. It is helpful if a brief description of
the fault symptoms is provided.
12. Customer comments
BEKA associates are always pleased to receive comments from
customers about our products and services. All communications are
acknowledged and whenever possible, suggestions are
implemented.
APPENDIX 1
Installation in USA
A1.0 Factory Mutual Approval
For installations in the USA the BA385-IIB and the BA385-IIC sounders
have been approved by Factory Mutual as intrinsically safe for Class I,
Divisions 1 and 2; and as nonincendive for Class I, Division 2.
BA385-IIB installations must comply with the BEKA associates control
drawing CI385-12 and BA385-IIC installations with control drawing CI385-
13. All installations must also comply with ANSI/ISA RP12.6 and the
National Electrical Code ANSI/NFPA70.
Copies of the FM control drawings are available from BEKA associates
and:
Exloc Corporation
PO Box 1100
Manassas
VA 20108
USA
Tel: [phone]
Fax: [phone]
e-mail: [email protected]om.com
All the intrinsically safe circuits shown in this instruction manual may be
used for installations in the USA, providing the Zener barriers and galvanic
isolators comply with the specified Factory Mutual entity parameters.
A1.1 intrinsic Safety Approval
Both the BA385-IIB and the BA385-IIC sounders have been evaluated
under the entity concept. The sounders may be connected to any
intrinsically safe circuit having output parameters equal to or less than:
Voc, Vt = 32V
Isc, It = 110mA
Po = 0.8W
The input terminals of both sounders have no equivalent capacitance and
inductance, i.e. Ci and Li are zero. The maximum permissible cable
capacitance and inductance allowed for the Zener barrier or galvanic
isolator powering the sounder may therefore be used subject to the
limitation defined on the control drawings.
A1.2 Nonincendive Approval
The BA385-IIB and the BA385-IIC are Factory Mutual approved as
nonincendive for Class I, Division 2 locations, which allows both sounders
to be installed in Division 2 without the need for Zener barriers or galvanic
isolators. The maximum supply voltage must be less than 32V, and the
wiring must be nonincendive or 'Division 2 suitable' as defined in the
National Electrical Code ANSI/NFPA70. For supply voltages above 16V,
a series resistor having a value of (Vsupply – 16) / 0.04 ohms is required.
A1.3 Classes, Divisions, Gas Groups and Temperature rating
The two models have been approved by Factory Mutual for installation in
the following Divisions and Gas Groups.
BA385-IIB sounder
Intrinsic Safety Nonincendive
Division 1 or 2 Division 2
Class I Group C
Group D
Class I Group C
Group D
BA385-IIC sounder
Intrinsic Safety Nonincendive
Division 1 or 2 Division 2
Class I Group A&B
Group C
Group D
Class I Group A&B
Group C
Group D
Both sounders have a T4 rating and may be used at ambient
temperatures between –20 and +60oC.
Note: The BA385-IIB and BA385-IIC are not approved for use with Class
II and III dusts and fibers.
Issue 2 September 2002