Certification/Approvals; Lecex Units; Atex Units; Special Conditions For Safe Use - Eaton SM87BG Manual Del Usuario

Call points SM87BG/PB Exi
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5.0 Certification/approvals

lECEx units

Certified to IEC 60079-0, IEC 60079-11
Ex ia unit (IEC certification No. lECEx BAS10.0033X)
Ex ia IIC T4 Ga
Ex ia IIIC T135°C
(-55°C to +60°C)
The IECEx certificate and product label carry the IECEx
equipment protection level marking.
Ga Da
Where:
Ga signifies suitability for use in a Zone 0 surface
industries area in the presence of gas
Da signifies suitability for use in a Zone 0 surface
industries area in the presence of dust

ATEX units

Certified to EN60079-0, EN60079-11
Ex ia unit (ATEX certification No. Baseefa02ATEX0152X)
Ex ia IIC T4 Ga
Ex ia IIIC T135°C Da
(-55°C to +60°C)
The ATEX certificate and product labelcarry the ATEX
group and category marking:
II 1 GD
Where:
Signifies compliance with ATEX
II Signifies suitability for use in surface industries
1 Signifies suitability for use in a zone 0 area
G Signifies suitability for use in the presence of gases
D Signifies suitability for use in the presence of dust
(SM87PB) DNV Type approved. Approved according to
IEC60945: Maritime navigation and radio communication
equipment and systems.
The equipment is classed as exposed.
Minimum compass safe distance is 5m.

6.0 Special conditions for safe use

The apparatus enclosure is made from metal alloy which
must be protected against impact to avoid a possible risk
of ignition due to impact.

7.0 Functional safety - SM87PB

Introduction

The SM87PB Call Point has been designed for use
in potentially explosive atmospheres and harsh
environmental conditions. The marine grade alloy or
stainless enclosures are for use offshore or onshore,
where light weight combined with corrosion resistance
and strength is required.
The function of the call point is to raise an alarm manually
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Call points sM87BG/pB Exi TM147 Issue H January 2020 www.eaton.com
once verification of a fire or emergency condition exists,
by pushing the button.
The safety function of the SM87PB Call Point is to raise
the alarm when the Button is pressed.
Under No fault (Normal) Operating conditions the
SM87PB Push Button Unit will raise the alarm upon
operating the switch via pushing the button.
Under fault conditions the Failure mode of the Push
Buttons is a failure to raise the alarm. For the failure rate
associated with this failure mode please refer to the table
below.

Assessment of functional safety

The SM87PB Call Point is intended for use in a safety
system conforming to the requirements of IEC61508.
UL has conducted a Failure Modes Effect and Diagnostic
Analysis (FMEDA) of the SM87PB Push Button unit
against the requirements of IEC61508-2 using a proof test
interval of 8760hrs.
The results are shown below and are based on Route
The Call Point is classed as a Type A device.
sM87pB pushbutton
Safety Function of SM87PB Push Button:
'To raise the alarm upon pushing the button'
Architectural Type A
constraints: HFT=0
SFF= 79.7%
Random hardware
λ
= 0
DD
failures: λ
= 3.43E-08
DU
Probability of failure
PFD =1.50E-04
AVG
on demand:
(Low Demand Mode)
Probability of
PFH = 3.43E-08
Dangerous failure on
(High Demand
safety function:
Mode)
Hardware safety
integrity
compliance
[1]
Systematic safety
integrity
compliance
Systematic Capability
Overall SIL-capability
achieved
Proof Test Interval
=8760Hrs
MTTR = 8 Hrs
λ
= 0
SD
λ
= 1.34E-07
SU
SIL3
SIL3
Route 1
H
Route 1
S
SC2
SIL 2 (Low Demand)*
SIL 2 (High Demand)*
*Limited to SIL 2 due to SFF value
1.
H
SIL2