Technical information

Page 62
Ion Chamber Smoke Detectors
Intrinsically Safe Point Detectors
Features
• Conventional and addressable I.S. systems
• Suitable for worst case (EEx ia IIC T5)
• Tyco High Performance Optical (HPO) smoke
detector
• Compatible with S231i+ plus flame detector
• Compatible range of I.S. callpoints
The System Designer must be familiar with
BS5345, EN50 and BASEEFA certification and
have successfully completed an Appropriate
recognised course in Intrinsic Safety. Design of
the system requires that the designer has all the
information concerning the installation correctly
documented. The nature of the Hazard must be
defined by the customer and a survey carried out
to determine the proximity of the safe area to
establish cable runs.
The probability of a flammable mixture being
present is defined by a Zone Number. Flammable
gases are classified in Groups and their minimum
spontaneous ignition temperature is categorised
by Class. Tyco Safety Products supplied
equipment marked EEx ia IIc T5 would be
suitable for use in worst case conditions. Eg.
Zone 0 (ia), Hydrogen (IIc), T5 (100 deg C). The
Fire Alarm Equipment and Safety Barriers should
be placed as near as possible to the containment
wall of the Hazardous Area. This minimises the
cable lengths between the barrier and the
Hazardous Area and thus the capacity to store
energy.
In order that an Installation will comply with the
BASEEFA certification designated for each
system it is essential that the certified devices are
connected with cables of the specified limits.
These limits have been certified for specific
classifications of hazard in order that energy
storage is limited.
The number of devices connected to the barrier
and located in the Hazardous Area must always
be limited to not more than the listed maximum.
When a mixture of devices is connected to any
one zone the numbers must be reduced in
proportion to the ratio of the load presented to
the barrier. When a System includes the use of
either IF500Ex, S231i+ or S251i+, it must be
remembered that the load they present to the
circuit is twice that of a detector. A mixture of
large and small load devices connected to a zone
will require a calculation for the number of
allowed detectors.
There are two I.S. systems used by Tyco Safety
Products.
System 601 and System 602
System 601 is for use in conventional fire
detection circuits, and System 602 is for use with
MINERVA analogue addressable circuits. Two
Sounder Systems, (one earthed and one
isolated), are available and either can be used
with System 601 or System 602.
Datasheet - Product Code PSF64 “Series
300/400/500 Fire and Smoke Detectors”
Manual - Vol01A* “Detectors Fire Manual”
* Section is indicated next to the product code.
The ion chamber detector [type MF501EX/MF601Ex]
will respond very quickly to smoke composed of
very small particles - even those invisible to the
naked eye but may respond appreciably slower
to dense smoke composed of large particles.
Product Codes
516.030.002 (Vol 01A-03-D3)
MF501Ex Analogue Addressable Ion Chamber
smoke detector
516.050.004.Y (Vol 01B-04-D10)
MF601EX Conventional Ion Chamber Smoke
Detector
The MR501TEx/MR601TEX have been developed
to overcome the slower response of the optical
detectors to hot burning fires, by increasing the
sensitivity of the optical detector when it is
associated with a rapid change in temperature. In
this way it is intended to become a detector
which can cover some of the risks currently
covered by ion chamber detectors. Smoke
detectors will not detect burning alcohol or other
clean-burning liquids which do not generate
smoke particles.
Product Codes
516.031.005 (Vol 01A-03-D11)
MR501TEx Analogue Addressable High
Performance Optical smoke detector
516.054.011.Y (Vol 01B-04-D12)
MR601TEX Conventional High Performance
Optical Smoke Detector
High Performance Optical Smoke Detectors
Technical Specification - M300/500Ex (Including base)
MF500 MR500 MD500 MS300/MS500
Dimensions 102.6Dia x 90H 102.6Dia x 96H 102.6Dia x 89H 102.6Dia x 74.5H
Weight 0.3Kg/0.33Kg 0.3Kg/0.33Kg 0.28Kg/0.30Kg 0.275Kg
Temperature -20
o
C to +70
o
C-20
o
C to +70
o
C-20
o
C to +70
o
C-10
o
C to +60
o
C
Humidity 95% Non-condensing
M300 BASEEF A Cert. No.: EX88B2168X
M500 BASEEF A Cert. No.: EX89C2200X
M300Ex bases are CSA Approved Certificate No.: 2017002500004454