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Tech Edge "MODA" Fuel Level Probe (addendum)

 
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nuckolls.bob(at)aeroelect
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PostPosted: Wed Jan 03, 2018 9:38 am    Post subject: Tech Edge "MODA" Fuel Level Probe (addendum) Reply with 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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nuckolls.bob(at)aeroelect
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PostPosted: Thu Jan 04, 2018 7:48 am    Post subject: Tech Edge "MODA" Fuel Level Probe (addendum) Reply with quote

At 09:18 PM 1/3/2018, you wrote:

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

No . . . plastic only. You need to add the accessory
probe through the wall of a metal tank.


Bob . . .


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