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Valin
Joined: 13 Apr 2010
Posts: 31
Location: Colorado
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 Posted: Mon Jul 07, 2014 8:46 am Post subject: Engine Fire/Compartment Temperature Alert |
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Hey gang,
We’d like a simple way to light up an engine fire/compartment temperature annunciator on our instrument panel. We will be using a G3X Touch auxiliary temperature input to measure under-cowling temperatures. But, we will have a simple on panel annunciator for “Engine Fire” and the G3X doesn’t provide a discrete output for that.
What’s the best way to do this? We just need a switch that will close at a set temperature. We don’t know that temperature yet and will use the G3X measured data to get a normal baseline and set some level above that as a fire alert. So it would be good if it were a switch that closed at a temperature and was adjustable? Guessing between 180 – 200 DegF.
Thanks,
Valin
Lancair Legacy Project
Colorado
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wschertz(at)comcast.net
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| Posted: Mon Jul 07, 2014 3:53 pm Post subject: Engine Fire/Compartment Temperature Alert |
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A few years ago, Mark Steitle from Austin texas demonstrated a sensor and circuit that detected flame, not temperature. It looks for a specific frequency generated by a flame, You might google flame detectors to find a similar device
From: Valin & Allyson Thorn (thorn(at)starflight.aero)
Sent: Saturday, July 05, 2014 2:22 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Engine Fire/Compartment Temperature Alert
Hey gang,
We’d like a simple way to light up an engine fire/compartment temperature annunciator on our instrument panel. We will be using a G3X Touch auxiliary temperature input to measure under-cowling temperatures. But, we will have a simple on panel annunciator for “Engine Fire” and the G3X doesn’t provide a discrete output for that.
What’s the best way to do this? We just need a switch that will close at a set temperature. We don’t know that temperature yet and will use the G3X measured data to get a normal baseline and set some level above that as a fire alert. So it would be good if it were a switch that closed at a temperature and was adjustable? Guessing between 180 – 200 DegF.
Thanks,
Valin
Lancair Legacy Project
Colorado
[quote]
href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
href="http://forums.matronics.com">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/c
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jmjones2000(at)mindspring
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| Posted: Mon Jul 07, 2014 5:49 pm Post subject: Engine Fire/Compartment Temperature Alert |
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Beechcraft uses IR sensors in the king airs to detect fire. These should be commercially available.
They are susceptible to false indications when sunlight shines on them directly or indirectly.
Justin
On Jul 7, 2014, at 15:51, "William Schertz" <wschertz(at)comcast.net (wschertz(at)comcast.net)> wrote:
[quote] A few years ago, Mark Steitle from Austin texas demonstrated a sensor and circuit that detected flame, not temperature. It looks for a specific frequency generated by a flame, You might google flame detectors to find a similar device
From: Valin & Allyson Thorn (thorn(at)starflight.aero)
Sent: Saturday, July 05, 2014 2:22 PM
To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)
Subject: Engine Fire/Compartment Temperature Alert
Hey gang,
We’d like a simple way to light up an engine fire/compartment temperature annunciator on our instrument panel. We will be using a G3X Touch auxiliary temperature input to measure under-cowling temperatures. But, we will have a simple on panel annunciator for “Engine Fire” and the G3X doesn’t provide a discrete output for that.
What’s the best way to do this? We just need a switch that will close at a set temperature. We don’t know that temperature yet and will use the G3X measured data to get a normal baseline and set some level above that as a fire alert. So it would be good if it were a switch that closed at a temperature and was adjustable? Guessing between 180 – 200 DegF.
Thanks,
Valin
Lancair Legacy Project
Colorado
[b]
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Tue Jul 08, 2014 5:31 am Post subject: Re: Engine Fire/Compartment Temperature Alert |
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An easy way to monitor temperature is with a thermocouple connected to an EMS. The alarm set-point can be easily changed with software.
Joe
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Tue Jul 08, 2014 6:16 am Post subject: Re: Engine Fire/Compartment Temperature Alert |
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DX.com has Arduino compatible flame detector modules for $2.43 with FREE SHIPPING. Since it has only four leads, it should be easy to use with other electronics too. Little trim pot for sensitivity too.
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Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Tue Jul 08, 2014 6:20 am Post subject: Re: Engine Fire/Compartment Temperature Alert |
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How about a SPDT temperature switch like the CCD101N-200
http://www.omega.com/pptst/CCD100.html
Many appliances contain an inexpensive high temperature limit switch, but are usually normally closed, open on high temp.
Joe
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Tue Jul 08, 2014 7:14 am Post subject: Re: Engine Fire/Compartment Temperature Alert |
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| Quote: | | How about a SPDT temperature switch like the CCD101N-200 |
This "fire detection" problem has been worked on for decades. The problem with IR detectors is that a positive signal doesn't necessarily mean there is a fire. Hot exhausts are very hot, while a fire might begin as reasonably cold per unit volume. (The Sun's corona is only a few watts per cubic meter!). So they like to detect the UV frequencies of the light.
But HEY! how about a home fire/smoke detector? There's an experiment to try. But I'd try the DX.com part first. And keep in mind that cameras are cheap too!
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Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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