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capacitance probes

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jbr79r(at)yahoo.com
Guest

Posted: Sun Sep 28, 2008 8:05 pm Post subject: capacitance probes

Hi Bob

I have a question regarding capacitance fuel probes.  I am having a fuel level reading on my lt tank that was fluxuating and is now reading zero. I am trying to narrow the problem.  Probes, analog to digital converter/ wiring / EngineAirdataUnit  EAU.  My first thing to eliminate is the probe.  It has 3 wires red-black-white if that helps.

Jim Robinson

Glll  N79R

 [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Sep 29, 2008 6:41 pm Post subject: capacitance probes

At 09:03 PM 9/28/2008 -0700, you wrote:



 	  Quote: 	
		  Hi Bob

I have a question regarding capacitance fuel probes.  I am having a fuel 

level reading on my lt tank that was fluxuating and is now reading zero. I 

am trying to narrow the problem.  Probes, analog to digital converter/ 

wiring / EngineAirdataUnit  EAU.  My first thing to eliminate is the 

probe.  It has 3 wires red-black-white if that helps.

Jim Robinson

Glll  N79R


	


   Sorry old friend. I'm not familiar with any of the

   systems offered to the OBAM aircraft market. I am about

   to take on a design task for a new capacity based fuel

   gaging system for TC aircraft and I'm looking forward to

   adding this technology to my bag of tricks.



   My best guess is that if your probe has ordinary bundled

   strands of wire for connection, these wires are NOT part

   of the capacity dependent fuel sensing system. I would guess

   that they are power, ground and some signal wire compatible

   with the companion display.  Do you have more than one sensor?

   Right and left tanks perhaps? Try swapping sensors and see

   if the problem swaps.



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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jbr79r(at)yahoo.com
Guest

Posted: Mon Sep 29, 2008 7:23 pm Post subject: capacitance probes

Thanks Bob 

I sent a second message, please disregard.  I just jumped the gun

Jim



--- On Mon, 9/29/08, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net> wrote:

[quote]From: Robert L. Nuckolls, III <nuckolls.bob(at)cox.net>

Subject: Re: Re: capacitance probes

To: aeroelectric-list(at)matronics.com

Date: Monday, September 29, 2008, 8:41 PM



[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"

<nuckolls.bob(at)cox.net>



At 09:03 PM 9/28/2008 -0700, you wrote:



 	  Quote: 	
		  Hi Bob

I have a question regarding capacitance fuel probes.  I am having a fuel 

level reading on my lt tank that was fluxuating and is now reading zero. I 

am trying to narrow the  problem.  Probes, analog to digital converter/ 

wiring / EngineAirdataUnit  EAU.  My first thing to eliminate is the 

probe.  It has 3 wires red-black-white if that helps.

Jim Robinson

Glll  N79R


	


   Sorry old friend. I'm not familiar with any of the

   systems offered to the OBAM aircraft market. I am about

   to take on a design task for a new capacity based fuel

   gaging system for TC aircraft and I'm looking forward to

   adding this technology to my bag of tricks.



   My best guess is that if your probe has ordinary bundled

   strands of wire for connection, these wires are NOT part

   of the capacity dependent fuel sensing system. I would guess

   that they are power, ground and some signal wire compatible

   with the companion display.  Do you have more than one sensor?

   Right and left tanks perhaps? Try swapping sensors and see

   if the problem swaps.



   Bob . . [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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jbr79r(at)yahoo.com
Guest

Posted: Mon Sep 29, 2008 7:40 pm Post subject: capacitance probes

Thanks Bob

The probe wires run to a analog/digital converter that feeds the display.  It is rather difficult to remove the probes so I was hoping to eliminate this as a problem without removal.  Maybe someone on the list is familiar with these things.

Jim Robinson



--- On Mon, 9/29/08, Robert L. Nuckolls, III <nuckolls.bob(at)cox.net> wrote:

[quote]From: Robert L. Nuckolls, III <nuckolls.bob(at)cox.net>

Subject: Re: Re: capacitance probes

To: aeroelectric-list(at)matronics.com

Date: Monday, September 29, 2008, 8:41 PM



[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"

<nuckolls.bob(at)cox.net>



At 09:03 PM 9/28/2008 -0700, you wrote:



 	  Quote: 	
		  Hi Bob

I  have a question regarding capacitance fuel probes.  I am having a fuel 

level reading on my lt tank that was fluxuating and is now reading zero. I 

am trying to narrow the problem.  Probes, analog to digital converter/ 

wiring / EngineAirdataUnit  EAU.  My first thing to eliminate is the 

probe.  It has 3 wires red-black-white if that helps.

Jim Robinson

Glll  N79R


	


   Sorry old friend. I'm not familiar with any of the

   systems offered to the OBAM aircraft market. I am about

   to take on a design task for a new capacity based fuel

   gaging system for TC aircraft and I'm looking forward to

   adding this technology to my bag of tricks.



   My best guess is that if your probe has ordinary bundled

   strands of wire for connection, these wires are NOT part

   of the capacity dependent fuel sensing system. I would guess

   that they are power, ground and some signal wire [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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wlively(at)gvtc.com
Guest

Posted: Tue Sep 30, 2008 12:54 pm Post subject: Capacitance Probes

Jim



  Could you describe your set-up more thoroughly? What type probes, converter and output volts, ect.



  The probes themselve work as a capacitor, two plates with one wire for each. The three wires you mentioned probably go to the converter. Which converts the capacitive reading to probably vdc (0-5 my guess) for your display. If so, you can read the output of the converter with a multimeter and see if that jives with the level reading. You can also set your multimeter to diode check and use that as a voltage source to inject a voltage (1. something if I remeber right)to your gauge and see what level it gives to test the wiring and gauge. Can compare to other side. This ONLY applies if your system is set-up as I guessed.



  Hard to say more without more details of the system.



Wade

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jbr79r(at)yahoo.com
Guest

Posted: Tue Sep 30, 2008 2:17 pm Post subject: Capacitance Probes

Wade

Thanks for the response.  I have Vision Micro probes (lt and rt) that feed into a converter box (analog to digital) then into the GRT  EAU.  I spoke to Princeston Electronics (they make the converter box)  He said that they have had some problems with the older unit I have and they have improved the newer units.  He was very gracious to warrantee my units, and is sending me new converters.  The new units have some other diagnostic functions that mine don't so that should be helpful.  I'll keep you posted.

Jim Robinson

N79R  Glll



--- On Tue, 9/30/08,  <wlively(at)gvtc.com> wrote:

[quote]From:  <wlively(at)gvtc.com>

Subject: Re: Capacitance Probes

To:  aeroelectric-list(at)matronics.com, aeroelectric-list(at)matronics.com

Date: Tuesday, September 30, 2008, 2:54 PM



[quote]--> AeroElectric-List message posted by: ""

<wlively(at)gvtc.com>



Jim



  Could you describe your set-up more thoroughly? What type probes, converter

and output volts, ect.



  The probes themselve work as a capacitor, two plates with one wire for each.

The three wires you mentioned probably go to the converter. Which converts the

capacitive reading to probably vdc (0-5 my guess) for your display. If so, you

can read the output of the converter with a multimeter and see if that jives

with the level reading. You can also set your multimeter to diode check and use

that as a voltage source to inject a voltage (1. something if I remeber right)to

your gauge and see what level it gives to test the wiring and gauge. Can compare

to other side. This ONLY applies if your system is set-up as I [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:

http://www.matronics.com/Navigator?AeroElectric-List

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