Funny this thread should crop up just now.
We have been having problems wioth our EIS readings for the last month or so
but it has got worse. It only affects the Oil temp and Oil pressure
readings.
On startup they appear to be normal (ie: as expected) and usually stay that
way for about 20 mins running. They then start jumping around within a
range of about 10 degrees (not sufficient to set off the alarms).
On the last occasion, an hour into the flight the same thing happened, only
the oil temp was reading unusually low (about 75 degrees C instead of about
105) and the oil pressure was indicating about 90psi. All other readings
were normal (EGT/ CHT/ water temp etc). I wasnt concerned for the engine
because the readings were nonsensical. If there had been a low pressure and
low temperature OR a high pressure and high temperature, I would have been
heading for the nearest airfield (or field even).
I suspect that the Oil Temp sender is failing but that is only a guess (it
has done about 600 hours). Has anyone else had a similar problem.
I am just hoping it isnt the EIS as it will be an absolute bastard to remove
---From the instrument panel and then I have to send it to the States to get it
fixed.
I read that the VDO pressure senders occasionally fail on the 912 and I was
wondering what the symptoms are.
Incidentally, I have the Rotax graph showing resistance vs pressure so I
could isolate the pressure sensor and connect it to a resistance/ multimeter
and see whether we get the same fluctuations, unless someone can lend me a
spare sender for a week or so. I dont want to spend 140 on a replacement
sender if it isnt necessary.
Carl Pattinson
G-LABS
----- Original Message -----
From: "Richard Holder" <rholder@avnet.co.uk>
Subject: Re: Europa-List: Engine Gauges.
>
> > If anyone has the Europa supplied (VDO) engine temperature and pressure
gauges
> > still waiting to be installed, I would be most grateful for a little
data.
> >
> > I am interested in the voltage required to give max and min readings on
the
> > oil/water temperature and oil pressure gauges.
> >
> > Is there any printed data anywhere.
> >
> > regards,
> >
> > Mike
>
> They don't work by voltage. The sensor connects to earth and the
resistance
> in that circuit defines the reading on the gauge.
>
> To test connect up 12 v+ and earth to the correct terminals on the gauge.
> Then get a variable resistor set and connect between the "S" terminal and
> the earth terminal.
>
> The you can calibrate he readings you need.
>
> One (the oil pressure) will work in the reverse sense !
>
> HTH
>
> Richard
> Richard F.W. Holder 01279 842804 (POTS)
> Bell House, Bell Lane, 01279 842942 (fax)
> Widford, Ware, Herts, 07860 367423 (mobile)
> SG12 8SH email : rholder@avnet.co.uk
> Europa Classic Tri-gear : G-OWWW, High Cross
> PA-28-181 : Piper Archer : G-JANA, EGSG (Stapleford)
>
>
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