REFLECTOR:Looking for suggestions about fire detection
Wayne Owens
reflector@tvbf.org
Sat, 17 May 2003 18:12:35 -0400
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I used Thermal fuses (from Digi-Key) in a string (series) around likely =
hot spots. One end is grounded and the other end is tied to the anode of =
a flashing red LED (also Digi-Key)on my annunciator panel. The LED anode =
is fed from a resistor tied to positive voltage (cathode is grounded) =
but the fuse string keeps the anode low until one of them blows =
(overheats). That allows current to flow through the flashing LED to =
ground.
You should insert a normally closed "press to test" switch in the =
string also.
Wayne
----- Original Message -----=20
From: PVTPIL8@aol.com=20
To: reflector@tvbf.org=20
Sent: Saturday, May 17, 2003 4:18 PM
Subject: REFLECTOR:Looking for suggestions about fire detection
I've got the fire suppression worked out now were looking for the =
early detection. Anyone have some suggestions. Wayne or Scott??
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<DIV><FONT face=3DArial size=3D2>I used Thermal fuses (from Digi-Key) in =
a string=20
(series) around likely hot spots. One end is grounded and the other end =
is tied=20
to the anode of a flashing red LED (also Digi-Key)on my annunciator =
panel. The=20
LED anode is fed from a resistor tied to positive voltage (cathode is =
grounded)=20
but the fuse string keeps the anode low until one of them blows =
(overheats).=20
That allows current to flow through the flashing LED to =
ground.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> You should insert a normally =
closed "press to=20
test" switch in the string also.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Wayne</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3DPVTPIL8@aol.com =
href=3D"mailto:PVTPIL8@aol.com">PVTPIL8@aol.com</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, May 17, 2003 =
4:18=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> REFLECTOR:Looking for=20
suggestions about fire detection</DIV>
<DIV><BR></DIV><FONT face=3Darial,helvetica><FONT lang=3D0 =
face=3DArial size=3D2=20
FAMILY=3D"SANSSERIF">I've got the fire suppression worked out now were =
looking=20
for the early detection. Anyone have some suggestions. Wayne or=20
Scott??</FONT> </FONT></BLOCKQUOTE></BODY></HTML>
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