© 1997 Thorn Security Limited PAGE 7 of 7
Registered Office: Security House The Summit Hanworth Road Sunbury-on-Thames Middlesex TW16 5DB
M300 SERIES
01A-02-D4
02 2/97
EQUIPMENT:
PUBLICATION:
ISSUE No. & DATE:
4.6 RESPONSE TO FIRE TESTS
The response of an optical scatter detector to a particular “re-
al” fire will depend, to a large extent, on the colour of the
smoke produced in the fire. In order to evaluate the response
under realistic conditions, detectors are subjected to test fires
which cover a range of fire types. These tests are defined in
BS 5445: Pt.9 [EN54 Pt.9] which also defines the way in
which detector sensitivity is classified. Three classes are used;
A, B and C, where A is the highest sensitivity. If the detector
does not respond, or responds inadequately to a test fire, it is
not classified,i.e. [N].
Typical results for the MR301 are given in Table 3.
Table. 3 Response to Fire Tests
It will be noted that the MR301 is not classified for the open
[flaming] wood fire TF1. This test fire is typical of the fast-
burning fire which produces mainly invisible particles and
which, by definition, cannot be detected optically.
DESIGNATION TYPE CLASSIFICATION
TF1 open cellulosic
[wood - flaming]
N
TF2 smouldering pyrolysis
[wood]
A
TF3 glowing smouldering
cotton]
A
TF4 open plastics
polyurethane foam
C
TF5 liquid [n-heptane] C
TF6 liquid [methylated
spirit]
N
5. ORDERING INFORMATION
MR301H High Sensitivity: 516-021-004
MR301 Normal Sensitivity: 516-021-002
MR301Ex Normal Sensitivity
Intrinsically-Safe: 516-021-003
MR301L Low Sensitivity: 516-021-001
6. RELATED PUBLICATIONS
01A-02-D2 M300 SERIES DETECTOR BASE AND ACCESSORIES, PRODUCT APPLICATION &
DESIGN INFORMATION,
01A-02-I1 M300 SERIES DETECTOR BASE AND ACCESSORIES, INSTALLATION
INSTRUCTIONS
01A-02-C1 M300 SERIES DETECTOR BASE AND ACCESSORIES, COMMISSIONING
INSTRUCTIONS
01A-02-S1 M300 SERIES DETECTORS AND BASE, SERVICE & MAINTENANCE
JM/jm
19th February 1996
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