E2S D1 B2LD2 Series, Instruction Manual, Page: 6 / 12

E2S Warning Signals Impress House, Mansell Road, Acton, London W3 7QH www.e2s.com Tel: +44 (0)208 743 8880
Document No. D191-00-401-IS Issue 3 28-11-22 Sheet 6 of 6
12) 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.
13) Interchangeable & Spare Parts
The Beacon lens cover is interchangeable, contact E2S Ltd for
a replacement lens cover available in various colours.
To change the lens cover, unscrew the 4-off M5 socket head
screws, spring and flat washers using a 4mm Hex key.
Remove the wire guard and replace the old lens cover with the
new lens cover.
Fig. 10 Replacement of beacon lens cover
Fit the wire guard back onto the housing, over the new lens
cover aligning the fixing holes of the guard, lens cover and
housing. Refit the fixings to hold into place, the fixings MUST
be fitted in the order shown above.
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
(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
Warning – Hot surfaces. External surfaces
and internal components may be hot after
operation, take care when handling the
equipment.
M5 screw
M5 spring washer
M5 flat washer