---------------------------------------------------------- Lightning-List Digest Archive --- Total Messages Posted Sat 07/21/12: 2 ---------------------------------------------------------- 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 _____________________________________ Time: 04:33:55 AM PST US From: "Gerd Nowack" 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 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" > 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 _____________________________________ Time: 07:50:12 AM PST US From: "Bernard Melendez, Jr." Subject: Re: Lightning-List: 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 wrote: From: Gerd Nowack 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" > 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lightning-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Lightning-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/lightning-list Browse Digests http://www.matronics.com/digest/lightning-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.