Today's Message Index:
----------------------
1. 04:33 AM - Re: Re: Tank Sensor Trouble (Gerd Nowack)
2. 07:50 AM - Re: Re: Tank Sensor Trouble (Bernard Melendez, Jr.)
Message 1
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Subject: | Re: Tank Sensor Trouble |
Selwyn,
I really had enough of the trouble with the capacitance sensors. On top of the
compatibility troubles with the MGL EFIS I found out that they dont work well
at all if you have an alcohol percentage in the fuel- European 95oct auto fuel
contains 5% alc!
So I went and drilled 3" holes into the top of my my wings and concentric 1 3/4"/44mm
holes into the top of the tanks, right at the wing root. I bought two
marine type VDO (as recommended by MGL )float type sensors , modified them a
little and epoxied them in. Calibration was no problem at all. Now everything
works just fine!
If anyone needs info about this, or pics, just ask!
Of course you could build those sensors into the wing roots in the same place
where those Princeton things would go. If you have your wings not yet in place.
Which i didn`t.
Gerd Kit no.89, D-ELIY
-------- Original-Nachricht --------
> Datum: Fri, 20 Jul 2012 03:05:32 -0700
> Von: "selwyn" <selwyn@ellisworks.com.au>
> An: lightning-list@matronics.com
> Betreff: Lightning-List: Re: Tank Sensor Trouble
>
> Hi, You are not alone with this. For a long sometimes contradictory
> discussion see this http://www.mglavionicsusers.org/forum/viewtopic.php?t=1028
>
> The problem is most likely not with the probes but with the Voyager RDAC
> not being able to handle the high impedance voltage signal from the
> Princeton probes. My understanding is that you need to remove the pull up
> resistors from the RDAC circuit board but I have not done this to mine yet.
Others
> have and had good results.
>
> I believe the latest RDAC has external switches to achieve the same thing.
>
> As a rough check on your probes you can measure the voltage output with a
> multimeter whilst filling the tanks, you should get a steadily increasing
> voltage allowing for tank geometry.
>
> I realise this is a late reply but I hope it is some use.
>
> --------
> Cheers, Selwyn
> Kit 66 VH-ELZ
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=378787#378787
>
>
>
>
>
>
>
>
>
>
Message 2
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Subject: | Re: Tank Sensor Trouble |
Hello Gerd,
Yes, I would like to see some pics and get any other technical info on how
yoiu did this. I'm about to drill the holes for the capacitance sensors, bu
t I would like to see what other options are available, especially as I'm a
bout to purchase my EFIS, maybe from MGL. I'm going to Oshkosh next week to
compare and buy my avionics. Thanks for your help.
Regards,
Bernardo
--- On Sat, 7/21/12, Gerd Nowack <nowacklinden@gmx.de> wrote:
From: Gerd Nowack <nowacklinden@gmx.de>
Subject: Re: Lightning-List: Re: Tank Sensor Trouble
Selwyn,
I really had enough of the trouble with the capacitance sensors. On top of
the compatibility troubles with the MGL EFIS I found out that they don=B4t
work well at all if you have an alcohol percentage in the fuel- European 95
oct auto fuel contains 5% alc!
So I went and drilled- 3" holes into the top of my my wings and concentr
ic 1 3/4"/44mm holes into the top of the tanks, right at the wing root. I b
ought two marine type VDO (as recommended by MGL )float type sensors , modi
fied them a little and epoxied them in. Calibration was no problem at all.
Now everything works just fine!
If anyone needs info about this, or pics, just ask!
Of course you could build those sensors into the wing roots in- the same
place where those Princeton things would go. If you have your wings not yet
in place. Which i didn`t.
Gerd---Kit no.89, D-ELIY
-------- Original-Nachricht --------
> Datum: Fri, 20 Jul 2012 03:05:32 -0700
> Von: "selwyn" <selwyn@ellisworks.com.au>
> An: lightning-list@matronics.com
> Betreff: Lightning-List: Re: Tank Sensor Trouble
>
> Hi, You are not alone with this.- For a long sometimes contradictory
> discussion see this http://www.mglavionicsusers.org/forum/viewtopic.php?t
=1028
>
> The problem is most likely not with the probes but with the Voyager RDAC
> not being able to handle the high impedance voltage signal from the
> Princeton probes.- My understanding is that you need to remove the pull
up
> resistors from the RDAC circuit board but I have not done this to mine ye
t.- Others
> have and had good results.
>
> I believe the latest RDAC has external switches to achieve the same thing
.
>
> As a rough check on your probes you can measure the voltage output with a
> multimeter whilst filling the tanks, you should get a steadily increasing
> voltage allowing for tank geometry.
>
> I realise this is a late reply but I hope it is some use.
>
> --------
> Cheers,- Selwyn
> Kit 66- VH-ELZ
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=378787#378787
>
>
>
>
>
>
>
>
>
>
le, List Admin.
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