REFLECTOR: Oil Pressure

[Scott Derrick]

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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>
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