European Safety Systems Ltd.
Impress House, Mansell Road, Acton, London W3 7QH
www.e2s.com
Tel: +44 (0)208 743 8880
Document No. D156-00-401-IS
Issue 4
28-11-22
Sheet 7 of 7
Figure 9: Lens & Guard Fixings Order.
11) 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
Units must not be opened while an explosive atmosphere is
present.
Repair of the flameproof threaded joints and cemented joints
is not permitted.
Electrostatic charging hazard - Clean only with a damp cloth.
12) 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 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
function
SIL2
& SIL1
Total Failure rate
0.
48
pmh
“Hazardous” failure rate (revealed)
0
pmh
“Hazardous” failure rate (unrevealed)
0.
48
pmh
“Safe” failure rate (revealed)
0 pmh
“Safe” failure rate (unrevealed)
0
System type
B
Hardware Fault Tolerance
0
Diagnostic Coverage
>
60
%
PFD (hazardous failure)
2.1
x 10
-
3
Proof Test Interval
Up to 1 year
