© 2010 Tyco Safety Products
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M600 SERIES
01B-04-D12
5
5/10
Registered Company: Thorn Security Ltd.
Registered Office: Dunhams Lane
Letchworth Garden City
Hertfordshire
SG6 1BE
EQUIPMENT:
PUBLICATION:
ISSUE No. & DATE:
MR601TEx INTRINSICALLY SAFE ENHANCED OPTICAL SMOKE DETECTOR
PRODUCT APPLICATION AND DESIGN INFORMATION
1.
INTRODUCTION
The MR601TEx Intrinsically Safe High Performance Optical
Smoke Detector forms part of the M600Ex series of plug in
detectors for ceiling mounting. The detector plugs into the
5BEx 5” Universal IS Base and is intended for two-wire
operation on the majority of the control equipment currently
manufactured by the company. The Intrinsically Safe High
Performance Optical detector is available in one sensitivity
setting only.
2.
INTRINSIC SAFETY
The detectors are for use in potentially explosive gas and dust
atmospheres (zone 0 gas, zone 20 dust).
The detectors are designed to comply with EN/IEC 60079-
0:2006, EN/IEC 60079-11:2007 and EN/IEC61241-11:2006 for
Intrinsically Safe apparatus. They are certified:
ATEX code:
II 1 GD
Certificate:
BAS01ATEX1134X
Gas/Dust code:
Ex ia IIC T5
Ex iaD 20 T100°C
IECEx Certificate:
IECEx BAS 07.0056X
These detectors are designed and manufactured to protect
against other hazards as defined in paragraph 1.2.7 of Annex II
of the ATEX Directive 94/9/EC.
2.1
DETECTOR USE
It is recommended that the detector is used in conjunction with
a suitable isolator or shunt diode safety barrier in a certified
Intrinsically Safe system, ie, System 620.
2.2
SPECIAL CONDITIONS OF SAFE USE
The apparatus has a plastic enclosure which constitutes a
potential electrostatic hazard. The enclosure must be cleaned
only with a damp cloth.
3.
OPERATING PRINCIPLE
The MR601TEx operates by sensing the optical scatter from
smoke particles generated in a fire. While the optical scatter
detector can give good detection performance for the majority
of fires, some fast burning fires produce little visible smoke and
some produce very black smoke, neither of which are easily
detected by the optical scatter detector. (Such fires are
represented in EN54-7 by Polyurethane and Heptane type fires
respectively). These fires do, however, produce high heat
outputs with an associated rise in air temperature.
The detector has been designed to offer improved detection of
such fires, by detecting the rapid rate-of-rise of air temperature
and under these conditions, increasing the smoke detection
sensitivity. This gives an earlier detection of such fires and a
broader detection capability than a standard detector.
The MR601TEx detector has two sensing systems as follows:
•
An optical chamber with associated electronics
to measure the presence of smoke by light
scatter.
•
A thermistor with its associated electronics to
detect the presence of hot air draughts or high
temperatures.
Fig. 1
Optical System Schematic