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Well, I had to take that one on…
J
Capitance-type
fuel probes have no moving parts and are almost bullet-proof, but you can check for a short between the center probe and the case/tube. That would be the only “failure” mode I can think of—the measured resistance should be infinite. You could also confirm
that the connections to the center probe and the case/tube are clean/not corroded. The next checks should be in the oscillator circuit and associated wiring. Power to the oscillator? Good ground? Good continuity from the frequency sensing lead to the back
of the display unit? So the probes are very unlikely to fail, but there are some intermediary parts that can give you fits…
Bob
From: Lancair
Mailing List [mailto:lml@lancaironline.net] On Behalf Of Danny
Sent: Monday, May 13, 2013 5:02 PM
To: lml@lancaironline.net
Subject: [LML] Re: Electronics International divide-by-4 (/4)
EII says probes can't fail.
Sent using my iPhone.
Does anyone know a method to test a VM probe in the wing when the wing has been removed from the ,plane.
Also, assuming the probe is faulty, where to find a replacement????
On Mon, May 13, 2013 at 4:50 AM, Greenbacks, UnLtd. <N4ZQ@verizon.net> wrote:
Danny, their /4 changes the base sensor count before calibration and depending on the length of your probes, there should be no need to install this device between the probe and FLC.
I have 2 4' Vision Micro Systems probes in my wings and they interface seamlessly with my EI MVP-50. Their /4 device is
required in line when the probe is short as in my header tank...16".
Angier Ames
N4ZQ
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