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10) Maintenance, Overhaul and 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
Flameproof threaded joints and cemented joints are not
permitted to be repaired.
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
prior to opening the unit.
Electrostatic charging hazard - Clean only with a damp cloth.
European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH
Document No. D157-00-001-IS
Issue 9
28-11-22
11) 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 (route
2
).
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 sounding sounder.
Spurious sound 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 function
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
SIL2 & SIL1
0.55 pmh
0 pmh
0.55 pmh
0 pmh
0
B
0
>80%
-3
2.4 x 10
Up to 1 year
Tel: +44 (0)208 743 8880
Sheet 7 of 7
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