[Mich48041]

We have been told not to trust fuel gauges. But if there were two fuel gauges using different technologies and they both indicated the same level, then could we trust that? If so, then a sight glass would not be needed.
The Dynon FlightDEK-D180 has inputs for two fuel sending units which can be setup for either resistive (float) or capacitance type sending units. Van's Aircraft sells a Capacitive to Voltage Converter that is compatible with the Dynon, Part Number = IE P-300C, Price = $45.00. See Dynon's website: http://www.dynonavionics.com/docs/news_cap_to_volt_shipping.html

Van's also sells a kit to make a probe for $60 (not designed for the RV-12). Or you can make your own with a 6" x 11" aluminum sheet insulated from and mounted 1/8" from the tank side. This guy made his own:http://74.125.47.132/search?q=cache:fbjbN8duasMJ:myweb.tiscali.co.uk/jbtrellis/Correspondence%2520on%2520cap%2520fuel%2520sender.doc+%22file+I%27ve+edited+down+from+a+series+of+communications+%22&cd=1&hl=en&ct=clnk&gl=us&client=firefox-a
There are probably commercially available capacitance probes that output 1 - 5 volts that the Dynon requires. Their advantage is being top mounted and ready made.
Anyone have comments or suggestions?
Joe

 

[N282S]

I used the Dynon converter

I used the Dynon converter on my capacitance tanks that you have pictured. I had to do a lot of calculating and punching of numbers into the GRT EIS unit and the GRT EFIS, but after calibrating the tanks everything seems to be working with fairly decent (I know, decent, is a relative word) accuracy.

 

[MLock]

If you sit in the pilot seat of the RV-12, the sight glass is very difficult to see. So why have it at all? Well, on my RV-8, during the preflight, I always check the fuel level by removing the cap and looking in the tank. Can't do that with the RV-12 fuel filler neck. The sight glass is a way to visually check the level of fuel during preflight.