MEDC SM87BG/PB Manual De Uso página 7

The ATEX certificate and product label carry the ATEX group and category marking:
II 2 GD
Where:
Signifies compliance with ATEX
II Signifies suitability for use in surface industries
2 Signifies suitability for use in a zone 1 area
G Signifies suitability for use in the presence of gases
D Signifies suitability for use in the presence of dust
DNV Type approved (SM87PB only). 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 FUNCTIONAL SAFETY
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 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 1
The Call Point is classed as a Type A device.
© Eaton MEDC Ltd 2017
H
07/17