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ainut(at)knology.net
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 Posted: Mon Jan 02, 2012 10:34 am Post subject: Capacitive Fuel Level Sensor - How do they work? |
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Are they reliable and relatively accurate?
David
user9253 wrote:
| Quote: |
http://www.discovercircuits.com/PDF-FILES/capgage.pdf
A capacitor is constructed of two parallel conductors insulated from each other. The amount of capacitance is related to the distance between the conductors and the type of insulation. The insulation between the conductors of a capacitance fuel level probe consists of air and/or fuel. As the fuel lever changes, so does the capacitance. The capacitance is part of an oscillator circuit. As the capacitance changes, so does the oscillator frequency. The frequency is converted to a voltage that is displayed with a fuel gauge.
The advantage of a capacitance type fuel level probe is that there are no moving parts. The disadvantage is that the gauge must be calibrated each time that the type of fuel is changed because unleaded fuel and leaded fuel and gasohol each have different insulating properties. When the fuel tank is almost full, the capacitance fuel gauge will display different levels depending on the type of fuel in the tank. When the tank is almost empty, the fuel gauge will be more accurate because air is now the insulating medium and the probe does not know or care what type of fuel used to be in the tank.
Joe
--------
Joe Gores
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Tell the truth. Be honest. Be responsible to and for yourself.
I liked America when it was free and it's people were responsible and had morals.
Every gram of cocaine you buy from elsewhere contributes to an innocent being murdered in Central and South America. Grow your own or Stop taking it.
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ainut(at)knology.net
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| Posted: Mon Jan 02, 2012 10:52 am Post subject: Capacitive Fuel Level Sensor - How do they work? |
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Wow. That site refuses to allow me a connection, even to their home page.
David M.
jonlaury wrote:
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The electronics have been explained by Joe and Sarg, and Sarg elaborated on his experience with Princeton probes.
But the reason for installing cap probes has gone unanswered.
Cap probes allow for fuel measurement of irregularly shaped tanks. My fuel bays in the wing change in taper, both in depth and width, in addition to the whole tank sitting at an angle (dihedral), making any kind of accurate measurement impossible over the tank range when using a linear type (float) sensor.
I have installed 8' Centroid probes. Haven't fueled them yet.
They come with two small potentiometers built in to adjust the empty and full points. Available in 0-5v output and various resistance output so you can use them with your existing gauge.
http://www.centroidproducts.com/tableofc.htm
Not a recommendation, just a resource, as I have no real world experience with this product, . YMMV.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=362237#362237
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--
Tell the truth. Be honest. Be responsible to and for yourself.
I liked America when it was free and it's people were responsible and had morals.
Every gram of cocaine you buy from elsewhere contributes to an innocent being murdered in Central and South America. Grow your own or Stop taking it.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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N20DG
Joined: 02 Jan 2008
Posts: 61
Location: lancaster, texas
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| Posted: Mon Jan 02, 2012 11:17 am Post subject: Capacitive Fuel Level Sensor - How do they work? |
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You're not along
Dick
In a message dated 1/2/2012 12:53:43 P.M. Central Standard Time, ainut(at)knology.net writes:
| Quote: | --> AeroElectric-List message posted by: David <ainut(at)knology.net>
Wow. That site refuses to allow me a connection, even to their home page.
David M.
jonlaury wrote:
| Quote: | --> AeroElectric-List message posted by: "jonlaury"<jonlaury(at)impulse.net>
The electronics have been explained by Joe and Sarg, and Sarg elaborated on his experience with Princeton probes.
But the reason for installing cap probes has gone unanswered.
Cap probes allow for fuel measurement of irregularly shaped tanks. My fuel bays in the wing change in taper, both in depth and width, in addition to the whole tank sitting at an angle (dihedral), making any kind of accurate measurement impossible over the tank range when using a linear type (float) sensor.
I have installed 8' Centroid probes. Haven't fueled them yet.
They come with two small potentiometers built in to adjust the empty and full points. Available in 0-5v output and various resistance output so you can use them with your existing gauge.
http://www.centroidproducts.com/tableofc.htm
Not a recommendation, just a resource, as I have no real world experience with this product, . YMMV.
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=362237#362237
|
--
Tell the truth. Be honest. Be responsible to and for yourself.
I liked America when it was free and it's people were responsible and had morals.
Every gram of cocaine you buy from elsewhere contributes to an innocent being murdered in Central and South America. Grow your own or Stop taking = Use ilities ay - MATRONICS WEB FORUMS - List Contribution Web Site p;
|
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Bob McC
Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON
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| Posted: Mon Jan 02, 2012 3:18 pm Post subject: Capacitive Fuel Level Sensor - How do they work? |
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The Centroid Products site works perfectly for me by following the link provided by John.
Here is the link he provided again in case this works better for someone than the original.
http://www.centroidproducts.com/tableofc.htm
and here is their home page if this helps.
http://www.centroidproducts.com
Good luck
Bob McC
From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of RGent1224(at)aol.com
Sent: Monday, January 02, 2012 2:14 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: AeroElectric-List: Re: Capacitive Fuel Level Sensor - How do they work?
You're not along
Dick
In a message dated 1/2/2012 12:53:43 P.M. Central Standard Time, ainut(at)knology.net writes:
| Quote: |
--> AeroElectric-List message posted by: David <ainut(at)knology.net>
Wow. That site refuses to allow me a connection, even to their home page.
David M.
jonlaury wrote:
> --> AeroElectric-List message posted by: "jonlaury"<jonlaury(at)impulse.net>
>
> The electronics have been explained by Joe and Sarg, and Sarg elaborated on his experience with Princeton probes.
>
> But the reason for installing cap probes has gone unanswered.
> Cap probes allow for fuel measurement of irregularly shaped tanks. My fuel bays in the wing change in taper, both in depth and width, in addition to the whole tank sitting at an angle (dihedral), making any kind of accurate measurement impossible over the tank range when using a linear type (float) sensor.
> I have installed 8' Centroid probes. Haven't fueled them yet.
> They come with two small potentiometers built in to adjust the empty and full points. Available in 0-5v output and various resistance output so you can use them with your existing gauge.
>
> http://www.centroidproducts.com/tableofc.htm
>
> Not a recommendation, just a resource, as I have no real world experience with this product, . YMMV.
>
> John
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=362237#362237
>
>
>
>
>
>
>
>
>
>
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>
--
Tell the truth. Be honest. Be responsible to and for yourself.
I liked America when it was free and it's people were responsible and had morals.
Every gram of cocaine you buy from elsewhere contributes to an innocent being murdered in Central and South America. Grow your own or Stop taking = Use ilities ay - MATRONICS WEB FORUMS - List Contribution Web Site p;
<![if !supportLineBreakNewLine]> <![endif]> - The AeroElectric-List Email Forum ---> http://www.matronics.com/Navigator?AeroElectric-List |
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[quote][b]
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_________________
Bob McC
Falco #908
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