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Architectural constraints:
Ar
Ar
h c
h c
e t i
e t i
t c
t c
r u
r u
l a
l a
o c
o c
s n
s n
Random hardware failures:
Ra
n
d
o
m
h
a
d r
w
r a
Probability of failure on demand:
Pr
o
b
a
l i b
y t i
y
f o
a f
u l i
Probability of Dangerous failure on
Pr
o
b
a
b
t i l i
y
f o
D
a
sa
safety function:
e f
y t t y
y
f
n u
t c
o i
: n
Ha
Hardware safety integrity
d r
w
a
e r
s
f a
et t y
y
[1]
[1
]
co
compliance
m
p
a i l
n
ce
Systematic safety integrity
Sy
s
e t
m
a
c i t
a s
e f
y t t y
co
compliance
co
m
m
p
p
a i l
a i l
n
n
ce
ce
Systematic Capability
Sy
y
s
e t
m
a
c i t
C
a
p
p b
a
Ov
Overall SIL-capability achieved
r e
l a
S l
L I
-
ca
p
p
a
Conditions of Safe use
The following conditions apply to the installation, operation and maintenance of the assessed equipment.
Failure to observe these may compromise the safety integrity of the assessed equipment:
1. The user shall comply with the requirements given in the manufacturer's user documentation (This
Safety Manual and Technical manual) in regard to all relevant functional safety aspects such as
application of use, installation, operation, maintenance, proof tests, maximum ratings, environmental
conditions, repair, etc;
2. Selection of this equipment for use in safety functions and the installation, configuration, overall
validation, maintenance and repair shall only be carried out by competent personnel, observing all
the manufacturer's conditions and recommendations in the user documentation.
3. All information associated with any field failures of this product should be collected under a
dependability management process (e.g., IEC 60300-3-2) and reported to the manufacturer.
4. The unit should be tested at regular intervals to identify any malfunctions; in accordance with this
safety manual.
01/12
BG
BGE BREAKGLASS UNIT
E
B
E R
Sa
Safety Function of BGE Break Glass Unit:
e f
t t y
y
F
n u
t c
o i
n
'To raise the alarm upon breaking the glass'
'T T o
o
a r r a
i i s
e s
t t h
e h
a
a l l a
r r m
Ty
Type A
e p
HF
HFT=0
HF
= T
= T
t s
t s
a r
a r
n i
n i
: s t
: s t
SFF= 97%
SF
F
!
!
DD
DD
e
a f
u il
e r
: s
!
!
DU
DU
PF
PFD
D
u
e r
o
n
e d
m
a
n
: d
(Low Demand
(L
o
w
Mo
Mode)
d
PF
PFH = 5.72E-07
H
n
n
e g
o r
s u
a f
u l i
e r
o
n
(H
(High Demand
i
g
g
Mo
Mode)
d
d
n i
i
e t
gr
y t t y i
n i
e t
r g
y t t y i
l i b
y y t t y i
b
l i b
y t t y i
y
a
h c
e i
e v
d
A
K
G
L
A
S
S
U
U
N
T I
f o
B
G
E
B
e r
k a
a
G
a l
s s
U
n
: t i
m
u u p
p
p
o
n
r b
a e
k a
n i i n
g
g
t t h
e h
g
g
l l a
s a
' s
A
Proof Test Interval
Pr
o
f o
e T
st
97%
0
0
=8760Hrs
=87
=87
60
60
H
H
s r
s r
=
9
7
%
MTTR = 8 Hrs
MT
T
R T
=
8
= 0
= 0
!
!
= 0
= 0
SD
SD
!
!
= 5.72 -07
= 5.72E-07
E
= 2.0
= 2.04E-05
SU
SU
=2.51E-03
=2
.5
1E
-03
03
AV
AVG
G
D
e
m
a
n
d
) e
=
5
7 .
2
E
-07
07
h
D
e
m
a
n
d
) e
Route 1
Ro
u
e t
Route 1
Ro
u
e t
SC
SC2
2
SI
SIL 2 (Low Demand)
L
2
(
o L
w
D
SI
SIL 2 (High Demand)
L
2
H (
g i
h
n I
e t
v r
l a
SIL3
SI 3
L
H
s r
4
E
-05
SIL2
SI
2 L
SIL2
SI
2 L
1
H
H
1
S
S
e
m
a
n
) d
D
e
m
a
n
) d
© Cooper MEDC 2011
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