Maintenance, Overhaul & Repair - E2S D1xB2X05 Instruction Manual

13) Maintenance, Overhaul & Repair
Maintenance, repair and overhaul of the equipment should
only be carried out by suitably qualified personnel in
accordance with the current relevant standards:
EN60079-19 / IEC60079-19 Explosive atmospheres -
Equipment repair, overhaul and reclamation
EN 60079-17 / IEC60079-17 Explosive atmospheres -
Electrical installations inspection and maintenance
To avoid a possible ELECTROSTACTIC CHARGE the unit
must only be cleaned with a damp cloth.
Units must not be opened while an explosive atmosphere is
present.
If opening the unit during maintenance operations a clean
environment must be maintained and any dust layer removed.
Flameproof joints are not intended to be repaired.
E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH
Document No. D191-00-201-IS Issue 3 28-11-22
14) SIL 2 Reliability Data
Reliability and Functional safety IEC/EN61508 which has
been assessed and is considered suitable for use in low
demand safety function:
1. Random Hardware Failures and Architectural constraints
2
(route ).
H
2. As an unvoted item (i.e. hardware fault tolerance of 0) at
SIL 2.
The product was assessed against failure modes:

Failure respond to an input by lighting a beacon.

Spurious light output despite no input.
3. When employing the device in a SIL2 compliant system
the user should ensure frequent or continuous automatic
monitoring of continuity.
Integrity in respect of failure to
Total Failure rate
"Hazardous" failure rate (revealed)
"Hazardous" failure rate (unrevealed)
"Safe" failure rate (revealed)
"Safe" failure rate (unrevealed)
System type
Hardware Fault Tolerance
Diagnostic Coverage
PFD (hazardous failure)
Proof Test Interval
www.e2s.com
function & SIL1
SIL2
48
0. pmh
0
pmh
48
0. pmh
0 pmh
0
B
0
60
> %
3
2.1
x 10 -
Up to 1 year
Tel: +44 (0)208 743 8880
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