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pwmac(at)sisna.com
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 Posted: Mon Jan 02, 2012 12:13 pm Post subject: Capacitive Fuel Level Sensor - How do they work? |
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The boat people deal with crazy shaped tanks. Here is one example
that uses a low tech float/resistor and a smart meter head.
http://www.cruzpro.com/products.html#HEADINGE
PaulW
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| Quote: | At 10:41 AM 1/2/2012, you wrote:
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.
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Wed Jan 04, 2012 1:52 pm Post subject: Capacitive Fuel Level Sensor - How do they work? |
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When a boat or ship leaves port the skipper and the navigator know exactly
how much fuel is on board...All they need is a flow meter to calculate how
much fuel they have on board. Aircraft however also like to know exactly
how much fuel is in each tank even if there is a break in a fuel line. That
requires an accurate method of measuring the fuel in the tank, in the air.
There are only two recognized methods; Capacitance fuel gauges and drip
sticks.... Drip sticks don't work in the air.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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