Technical information

Page 42
These detectors use two
networked thermistors in a bridge
configuration to provide a fast
response, that depends both on
absolute temperature and notes
the change of temperature. The
rate of rise/fixed temperature heat detectors can
be used in areas where smoke sensors are
unsuitable due to environmental conditions
(smoke, dust etc,). Such areas include kitchens,
locker rooms, canteens, garages, loading bays
etc.
The integral electronics emulate conventional fire
detector's response curves and transmit the state
to a controller as an analogue representation of
the ambient temperature conditions.
Datasheet - Product Code PSF84 “M600/900 Low
Profile Fire Detector Range”
Manual - Vol01B-03-D5 “Detectors Fire Manual”
Heat
Product CodesApproval Branded Model
516.053.001.A LPCB ADT MD901
516.053.001.T LPCB Thorn MD901
516.053.002 UL Thorn 912H
515461 UL Grinnell 912H
These detectors react to the visible
and invisible fire aerosols (products
of combustion) and are therefore
capable of detecting the early
presence of hot smouldering and
flaming fires, such as wood, paper
etc.
They are particularly suitable for general applications
in all areas and use a dual ionisation chamber in
which the air is ionised by a single radioactive source
(33k Bq Americium 241). The presence of smoke in
the sampling chamber causes a change in the
balance voltage, between the two chambers. This is
then converted to a current level and transmitted as
an analogue value.
Datasheet - Product Code PSF84 “M600/900 Low
Profile Fire Detector Range”
Manual - Vol01B-03-D3 “Detectors Fire Manual”
Ion Chamber Smoke
Product CodesApproval Branded Model
516.051.001.A LPCB ADT MF901
516.051.001.T LPCB Thorn MF901
516.051.001.Y LPCB Tyco MF901
516.051.031 UL Thorn 912I
515462 UL Grinnell 912I
516.051.401 Marine Thorn MF901M
Typical Dimensions of Standard 4” Detector
Technical Specification
Technical Specification - M901 Series
MD/MR MF MU
Weight 112g 137g 137g
Material FR 110 Bayblend
Operating Temp. -20 to +70
o
C -20 to +70
o
C 0 to +50
o
C
Storage Temp. -25 to +80
o
C -25 to +80
o
C -20 to +50
o
C
Relative Humidity 95% Non-Condensing
Quiescent Current(typ) 240µA 120µA 120µA