5
Call points SM87BG/PB
English
Call points sM87BG/pB
TM146 January 2023 www.eaton.com
sM87pB pushbutton
Safety Function of SM87PB Push Button:
‘To raise the alarm upon pushing the button’
Architectural constraints:
Type A
HFT= 0
SFF= 79.7%
Proof Test Interval
=8760Hrs
MTTR = 8 Hrs
SIL2
Random hardware failures:
λ
DD
= 0
λ
DU
= 3.43E-08
λ
SD
= 0
λ
SU
= 1.34E-07
Probability of failure on demand:
PFD
AVG
= 1.50E-04
(Low Demand Mode)
SIL3
Probability of Dangerous failure on safety
function:
PFH = 3.43E-08
(High Demand Mode)
SIL3
Hardware safety integrity compliance
[1]
Route 1
H
Systematic safety integrity compliance
Route 1
S
Systematic Capability
SC2
Overall SIL-capability achieved
SIL 2 (Low Demand)*
SIL 2 (High Demand)*
*Limited to SIL 2 due to SFF value
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.
