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<br /> TrueAlarmT'" SMtJKE SENSOR HEAD� i �
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<br /> FEATURES: �f`��� . I , #
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<br /> � 5mok� Density Measuring �,°���`:=_� ,���
<br /> I_ow P,�ra#ile ���" , .�
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<br /> • 360° Smake Entry for C)ptimum Respanse �` }� � .
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<br /> � Sensor Sealed Against Rear Air Fiow Entry �-_�°�:�. ; �� � �
<br /> • lnterchangeable Heads . ; - - �
<br /> • Listed to UL268 Testing Standards : � . . ;
<br /> • EM11Rri Shielded Ei�ctronics � � . ;
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<br /> 4098-9�01 PHOTOELECTRIC SENSOR � �s�$- I ��
<br /> The 4098-9741 Sensar operates on the photoslectric �
<br /> p�inc�pie, using a stak�le LED iight source and a silicon � � 12i,,
<br /> photodiode as the receiving element to form a highly �.�s�° �
<br /> accurate means of smoke detection. The sensitivity � ' � �
<br /> range of each individual photoelectric sensar set in the � �
<br /> c'antro! pariel is from 0.5%to 3.7°lo smake obscuration. ; ;
<br /> B�ecause this design features a pulsed light source,.very i ;
<br /> 4ittle power is consumed in normal operation. The � 4098-9701 � -
<br /> s�ensar head design provides 360` srnoke sntry for PHQTOELECTRIC �
<br /> o�piimum response to smake fram any direction. Tests i SENSOR '
<br /> show exceilent respanse to b(ack as wel{ as grey ;
<br /> smoke,f while a built-in screen keeps insects from � �
<br /> entering the smoke chamber. Due to the photoelectric �
<br /> operating principles, air velociEy is not a factar in its � ;
<br /> operation except as a carrier of smoke to ar away#ram !
<br /> the sensor. , ;,x,�:.:-;..�,; ,.�,.,r ;
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<br /> �4d98-97i 6 iON}ZAT{�N SENSOR .. ; ..;,,; �_.." � :_ � `.�`'='� i
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<br /> �he 4(?98-9716 Sensor design incorporates a single :=:='�l,-�,:� ,r s. �`�;'� - �r;� ;
<br /> radioactive saurce w'sth an outer sampling ionization ��> ,,� �`'` � �� �
<br /> ^ ,`5-� :;�m . . " ` ,:;�.
<br /> chamber and an inner reference ianizatian chamber ta �>�`' �- F-'_ " '� `��, ='._��'�
<br /> , � 'a�:;,,�-�.:. .<,-_� r
<br /> provide stable operafion under fiuctuations in "3� � 4 $"- .::�` r ' 3���3� �
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<br /> �env'sro�nmental conditions such as temperature and ���_,� ;�� ;�'. . `< ;„�x;;" �.; i
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<br /> ;humidity. ..;;��:"��'�" _ �� �V�A:� ,
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<br /> �Smoke and invisible combustion gases can freeiy '�'�,:-�.:� � � '�` . , � �
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<br /> �penetrate the outer chamber. With both chambers ���� , '
<br /> jionize�d by a radioactive saurce (Am 241), a very small � `m"y.` � 5
<br /> icurren`t fiows in the circui#. The presence of particles of j ; '
<br /> ,�combt�stion wiil cause a change in the vaitage ratia � s.3$" ; '
<br /> � between chambers.This diiference is measured by the
<br /> E slectronics in the sensor's base and digital(y transmitted � I � i i
<br /> ; back to the contro! pane! for prpcessing. � �
<br /> � , � �1.21•.
<br /> 2.2" �. �
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<br /> 4098-9716
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