REFLECTOR: Oil Pressure

[John Dibble]

What is ems?


Scott Derrick wrote:

> Where ever you attach the ems to ground attach your sensor grounds there
> too.
>
> John Dibble wrote:
> > My sensor is on the bottom of my oil cooler and has a ground wire attached to it.  I
> > added a second ground wire which passes through the landing light.  Would it help if I
> > ran the ground wire directly to the battery or to the buss?
> >
> > John
> >
> > Laurence Coen wrote:
> >
> >
> >> John,
> >>
> >> Your oil pressure transducer is likely grounded at the engine and your
> >> readout is grounded to your panel buss.  I suspect the ground potential at
> >> the panel buss changes with change in load but the same thing doesn't happen
> >> to the engine ground.  You can check the voltage between the engine and buss
> >> grounds with varying loads.
> >>
> >> Larry Coen
> >> N136LC
> >>
> >> --------------------------------------------------
> >> From: "John Dibble" <aminetech at bluefrog.com>
> >> Sent: Friday, July 31, 2009 9:02 AM
> >> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
> >> Subject: REFLECTOR: Oil Pressure
> >>
> >>
> >>> At this point I'm pretty sure I do not have an oil pressure problem.  On
> >>> the return from
> >>> OSH, my observant copilot noticed that every time I turned a knob the
> >>> pressure reading
> >>> changed.  So I turned off my radio and the pressure went up 6 psi.  Then I
> >>> turned off the
> >>> transponder and the pressure went up another 6 psi, making it 51 psig
> >>> which I am happy
> >>> with.  I checked the voltage drop across the relay and it is 0.  I checked
> >>> the voltage
> >>> drop between my RMI monitor ground and another ground.  I varied from
> >>> 0-0.02 v as I turned
> >>> on a few things.  The monitor power voltage decreased from 12.6 by 0.1
> >>> volt each time I
> >>> trurned on something.  I figure that's just the battery voltage going down
> >>> with increased
> >>> load.  What do I need to be looking at?
> >>>
> >>> John
> >>>
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