>>> Hi Clark,
Thanks for the info. I take it that you have been using the
ppavionics
system?<<<
-I have been using it for 1.5yrs and 300 hrs and love it. Since a software
update PPA made 12 months ago (to deal with the high RF environment of a
composite plane), it has worked virtually flawlessly. Pre the software change,
I occasionally had to reset the unit (ie, power it
off then on).
-Definitely wire a manual bypass. Previously, I had a homemade relay based fuel
transfer system (worked fairly well but only a basic automatic system). I wired a single switch which is the
manual bypass that is independent of the PPA system and runs both pumps. In
case of a failure of the PPA, I would just pump manually with the single switch
and use the 2 pump breakers if need for L/R control.
-I have 2 independent low header fuel warning systems. #1 is a caution warning driven by the
fuel probe and the EIS engine monitor (EIS master caution light). #2 is a completely independent system
driven by a float switch and a different warning light. Given that fuel exhaustion is a major
cause of accidents, I believe a system like this is a good idea.
- I would guess you have the Skysport probe. If so, it will work. That is what I had originally. However, you need to add a simple minature normally open relay to the low fuel output of the
fuel probe to reverse the logic.
The hi side is fine.
-Last year my Skysport probe
broke (second time). I had Todd at
Princeton Electronics make me up an electronic probe with 5 set points (to make
the readings linear). He custom
built hi/lo outputs that were compatible with the PPA system. He also coded the probe software to
activate the hi at 90% of the full reading and the lo
at 70% of full. These settings keep
my tank between 8.2 and 10 gallons.
Works great and no potentiometers/etc. to go out of adjustment. If you have the big SAE 5 bolt hole in
your header, this is a good option to use (versus separate hi and low sensors
in the tank). I have the EIS engine
system (see enclosed picture). I
can't find Todd's number, but he works closely with Greg at Grand Rapids
Technology.
http://www.hometown.aol.com/enginfosys
Regards,
Regards,
Clark Baker
N250JF
LNC2 360, 550hrs