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Its a Ultraviolet spectrum detector
that detects signatures that are unique to arcs and combustion.
Infrared heat signatures aren't the trigger. Some of the later
generation ones have both UV and Infrared to crosscheck each
other, but the key trigger is UV light from combustion.
These same detectors are used in chemical plants as fire
detectors, and the older ones can be falsely triggered by welders
arcs. I took a bath once in my younger days when a welder's arc
set off the fire suppression/deluge system in the unit in which we
were working.
Dave
On 8/2/2012 8:34 AM, Chris Barber wrote:
Also, it was impressive how it's response focused on flame
and not just heat, however, do we know how it responds to a
glowing exhaust?
Sent from my iPhone 4
Years ago there was an engine fire in a 20B pusher
(Velocity??) that was due to a burst oil cooler. He actually
blew up two coolers (same make/model), then switched to a
certified engine. I don't recall his name, but he was alerted
to the fire by ATC.
Mark S.
On Wed, Aug 1, 2012 at 9:48 PM,
John Slade
<jslade@canardaviation.com>
wrote:
Thanks for caring, Chris.
No. Not me.
I've never heard of the guy - Don Black???
I wonder what caused the fire. Oil or fuel leak?
Regards
John
On 8/1/2012 9:29 PM, Chris Barber wrote:
When I first heard I fears it was John Slade
but have been assured it was not. No less tragic
tho. I heard it was his sixth flight from a couple
of sources. Someone posted the registered name but
I did not immeadeatly recognize it. I had one fear
it was me. Not me yet yikes.
Sent from my iPhone 4
On Tue, Jul 31, 2012
at 7:11 PM, Mark Steitle
<msteitle@gmail.com>
wrote:
Chris,
Yes, that was me that brought and
demonstrated the IR fire detector. I
had it mounted in a metal project box on
the hot side of my engine, but it failed
shortly thereafter. My guess is the
UVtron photo tube failed. Replacement
sensors were $28/ea at the time, so it
has been sitting on the shelf waiting
for some time to mess with it again.
Since I experimented with the first
one, the design has been upgraded and
the old model is no longer available.
You can purchase the whole kit for $89
at
http://www.acroname.com/robotics/parts/R345-UVTRON-PKG.html . Just
mount it in a robust box with a hole
facing the engine and wire it to 12 - 24
volts. You'll want to put an LED on the
panel to warn you in case of fire.
Mark S.
On Tue, Jul
31, 2012 at 1:51 PM, Chris Barber
<cbarber@texasattorney.net>
wrote:
Several years ago at the rotary
get together in Pecan Gove south
of Ft Worth, Texas a flame
detector was demonstrated. Does
anyone remember this and have
any info on it? The demo was
impressive and I would
hope/think the technology has
improved and is available.
With the recent fire in a turbo
rosary canard a few days ago it
got me comptemplating such
matters again. Especially in a
pusher.
Thanks.
Chris Barber
Houston
Velocity 13b Turbo
Phase One Testing.
Sent from my iPhone 4
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