Functional Safety - MEDC DB4 Technisches Handbuch

7. The terminals shall only be installed and wired with cable in an ambient temperature of -10
Type DB4E/DB4LE - IECEx BAS11.0084X (EExe)
Type Designation
1. This equipment is not suitable for use in atmospheres containing carbon disulphide.
2. Painting and surface finishes, other than those applied by the manufacturer, are not permitted.
3. When used in a dust atmosphere the cable entries and stopping plugs must maintain the IP66 rating of the
enclosure.
4. Not more than one single or multiple strand lead shall be connected to any terminal unless multiple conductors
have been joined in a suitable manner, e.g. two conductors into a single insulated crimped boot lace ferrule.
5. Leads connected to the terminals shall be insulated for the appropriate voltage and this insulation shall extend to
within 1mm of the terminal throat.
6. All terminal screws, used and unused, shall be tightened down to between 0.5Nm and 0.7Nm.
7. The terminals shall only be installed and wired with cable in an ambient temperature of -10

7.0 FUNCTIONAL SAFETY

Introduction
The DB4 Speaker 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 DB4 Speaker can be configured with or without an EExe Chamber on the rear.
The FMEDA has considered the worst case scenario which includes the EExe Chamber on the rear.
The safety function of the Sounder is to provide an audible warning when required.
Under No fault (Normal) Operating conditions the DB4 Speaker will provide an audible warning when required.
Under fault conditions the failure mode of the Speaker 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
The DB4 Speaker 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 DB4
Speaker unit against the requirements of IEC61508-2 using a proof test interval of 8760hrs.
The DB4 Speaker is classed as a Type A device.
© Cooper MEDC 2011
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Maximum
Power
Rating
15W
DB4E
15W
25W
15W
DB4LE 15W
25W
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Ambient
Temperature
Temperature
Classification
Range
o o
-20 C to +70 C
o o
-20 C to +55 C
o o
-20 C to +50 C
o o
-40 C to +70 C
o o
-40 C to +55 C
o o
-40 C to +50 C
o
C to +80
Temperature
Marking
o
T4 T135 C
o
T5 T100 C
o
T4 T135 C
o
T4 T135 C
o
T5 T100 C
o
T4 T135 C
o
C to +80
o
C.
o
C.
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