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Tech Edge "MODA" Fuel Level Probe (addendum)

 
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rv8iator(at)gmail.com
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PostPosted: Wed Jan 03, 2018 12:13 pm    Post subject: Tech Edge "MODA" Fuel Level Probe (addendum) Reply with quote

Texas Instruments has a chip level solution for liquid level sensing by capacitive sense:
http://www.ti.com/general/docs/video/watch.tsp?entryid=4279163138001
-chris stone


On Wed, Jan 3, 2018 at 9:15 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
Quote:
Quote:
It is a sensor that attaches to the outside of a fiberglass tank with dual parallel strips of aluminum and copper tape.  Somehow it measures the resistance between the two strips and determines the fuel quantity on the other side of the tank wall.

  This is probably an adaptation of the 'capacity
  sensor' widely used on touch pads for manual controll
  inputs. It senses a change in capacity. The two
  electrodes attached to the outside of the tank form
  a capacitor in which the dielectric is composed of
  tank material and air.

  When fuel fills up the air space, the capacitance
  goes up sharply and the electronics senses this. For
  metal tanks, they need to penetrate the tank wall
  to get at the change in air-to-fuel capacitance.

  Okay, looking closer reveals that this is a
  capacity fuel gaging system, not just a level
  sensor. There is a whole new class of liquid level
  capacity transducer products out there.

  Recent developments in resolving capacity has
  spawned a variety of low cost instruments that
  will measure capacitance with good accuracy
  down into the picoFarads territory.

  There's a pretty simple methodology for using
  pic/arduino DIY processors to implement your own
  capacity liquid level measurement system wherein
  the sensor is nothing more than a twisted pair of
  wires with insulation impervious to the liquid being
  sensed.

  For the product cited above, the sensor is either
  copper foil electrodes on the outside of the plastic
  tank . . . or some analog built into the
  probe.

  This could be paired with a comparator that drives
  a 'tank full' indicator light.



  Bob . . .


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billhuntersemail(at)gmail
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PostPosted: Wed Jan 03, 2018 6:05 pm    Post subject: Tech Edge "MODA" Fuel Level Probe (addendum) Reply with quote

Thanks all for your help!!!

Good information.

..

Cheers!!!

Bill  Hunter




From: owner-aeroelectric-list-server(at)matronics.com [mailto:owner-aeroelectric-list-server(at)matronics.com] On Behalf Of Christopher Cee Stone
Sent: Wednesday, January 3, 2018 12:13 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: Tech Edge "MODA" Fuel Level Probe (addendum)

Texas Instruments has a chip level solution for liquid level sensing by capacitive sense:



http://www.ti.com/general/docs/video/watch.tsp?entryid=4279163138001



-chris stone



On Wed, Jan 3, 2018 at 9:15 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
Quote:
Quote:

It is a sensor that attaches to the outside of a fiberglass tank with dual parallel strips of aluminum and copper tape. Somehow it measures the resistance between the two strips and determines the fuel quantity on the other side of the tank wall.


This is probably an adaptation of the 'capacity
sensor' widely used on touch pads for manual controll
inputs. It senses a change in capacity. The two
electrodes attached to the outside of the tank form
a capacitor in which the dielectric is composed of
tank material and air.

When fuel fills up the air space, the capacitance
goes up sharply and the electronics senses this. For
metal tanks, they need to penetrate the tank wall
to get at the change in air-to-fuel capacitance.


Okay, looking closer reveals that this is a
capacity fuel gaging system, not just a level
sensor. There is a whole new class of liquid level
capacity transducer products out there.

Recent developments in resolving capacity has
spawned a variety of low cost instruments that
will measure capacitance with good accuracy
down into the picoFarads territory.

There's a pretty simple methodology for using
pic/arduino DIY processors to implement your own
capacity liquid level measurement system wherein
the sensor is nothing more than a twisted pair of
wires with insulation impervious to the liquid being
sensed.

For the product cited above, the sensor is either
copper foil electrodes on the outside of the plastic
tank . . . or some analog built into the
probe.

This could be paired with a comparator that drives
a 'tank full' indicator light.
Bob . . .


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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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wrmaxwell(at)bigpond.com
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PostPosted: Wed Jan 03, 2018 7:18 pm    Post subject: Tech Edge "MODA" Fuel Level Probe (addendum) Reply with quote

Interesting device. I wonder though whether a metal tank's contents can be measured as effectively by this device when mounted externally?

On 4/01/2018 7:12 AM, Christopher Cee Stone wrote:

Quote:
Texas Instruments has a chip level solution for liquid level sensing by capacitive sense:


http://www.ti.com/general/docs/video/watch.tsp?entryid=4279163138001


-chris stone




On Wed, Jan 3, 2018 at 9:15 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
Quote:
Quote:
It is a sensor that attaches to the outside of a fiberglass tank with dual parallel strips of aluminum and copper tape.  Somehow it measures the resistance between the two strips and determines the fuel quantity on the other side of the tank wall.

  This is probably an adaptation of the 'capacity
  sensor' widely used on touch pads for manual controll
  inputs. It senses a change in capacity. The two
  electrodes attached to the outside of the tank form
  a capacitor in which the dielectric is composed of
  tank material and air.

  When fuel fills up the air space, the capacitance
  goes up sharply and the electronics senses this. For
  metal tanks, they need to penetrate the tank wall
  to get at the change in air-to-fuel capacitance.

  Okay, looking closer reveals that this is a
  capacity fuel gaging system, not just a level
  sensor. There is a whole new class of liquid level
  capacity transducer products out there.

  Recent developments in resolving capacity has
  spawned a variety of low cost instruments that
  will measure capacitance with good accuracy
  down into the picoFarads territory.

  There's a pretty simple methodology for using
  pic/arduino DIY processors to implement your own
  capacity liquid level measurement system wherein
  the sensor is nothing more than a twisted pair of
  wires with insulation impervious to the liquid being
  sensed.

  For the product cited above, the sensor is either
  copper foil electrodes on the outside of the plastic
  tank . . . or some analog built into the
  probe.

  This could be paired with a comparator that drives
  a 'tank full' indicator light.



  Bob . . .





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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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