4
Call points SM87BG/PB
English
Call points sM87BG/pB
TM146 January 2023 www.eaton.com
4.0 Maintenance
During the working life of the unit, it should require little
or no maintenance. However, if abnormal or unusual
environmental conditions occur due to plant damage or
accident etc., then visual inspection is recommended.
If the unit requires cleaning, then only clean exterior
with a damp cloth to avoid electro-static charge build
up. If a unit fault should occur, then the unit can be
repaired by MEDC. All parts of the unit are replaceable.
If you acquired a significant quantity of units, then it
is recommended that spares are also made available.
Please discuss your requirements with the Technical Sales
Engineers at MEDC.
sM87pB spares
Description
part no.
2 Pole Microswitch
PX99900457
3 Pole Microswitch
PX99900477
Cover O-ring
PX99900233
Lift flap and pin kit
Contact MEDC
Cover screw for st. steel unit (4 off required)
PX99900584
Cover screw for alloy unit (4 off required)
PX99900818
Reset key (Not shown)
PX99900108
5.0 Certification/approvals
IECEx units
Certified to IEC 60079-0, IEC 60079-1 and IEC 60079-31
Ex d unit (IEC certification No. IECEx BAS 09.0060)
Ex d IIC T6 (-55°C to +55°C) Gb
Ex tb IIIC T85°C (-55°C to +55°C) Db IP66/IP67
or
Ex d IIC T5 (-55°C to +70°C) Gb
Ex tb IIIC T100°C (-55°C to +70°C) Db IP66/IP67
The IECEx certificate and product label carry the IECEx
equipment protection level marking
Gb
Db
Where:
Gb signifies suitability for use in a Zone 1 surface
industries area in the presence of gas.
Db signifies suitability for use in a Zone 21 surface
industries area in the presence of dust
ATEX units
Certified to EN60079-0, EN60079-1 and EN60079-31
Ex d unit (ATEX certification No. Baseefa03ATEX0075)
Ex d IIC T6 (-55°C to +55°C) Gb
Ex tb IIIC T85°C (-55°C to +55°C) Db IP66/IP67
or
Ex d IIC T5 (-55°C to +70°C) Gb
Ex tb IIIC T100°C (-55°C to +70°C) Db IP66/IP67
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
H
.
The Call Point is classed as a Type A device.
