Today's Message Index:
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1. 05:20 AM - Re: Oil Presure Gauge (Doug Gray)
2. 09:23 AM - Re: Oil Presure Gauge (Scott)
Message 1
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| Subject: | Re: Oil Presure Gauge |
R.C.,
Yes a shop could sort this out for you, just apply cash.
The multimeter looks to be just the ticket. I see it is already set on the o
hms scale, so here is a plan....
1. Disconnect the transducer, check the resistance between the terminal and t
he transducer body - this should be close to the 240 ohms. If not then you d
o not have the correct transducer. I notice you purchased the transducer fro
m ACS, but the gauge is from Vans. With this type of gauge the transducer h
as to have the resistance profile with pressure to match the gauge. I belie
ve Vans sells the correct transducer, I am uncertain if this matches anythin
g from ACS.
2. Now reconnect the transducer and disconnect the Sense terminal and the gr
ound from the gauge. The sense wire should go directly to the transducer te
rminal, and the ground should connect to the case of the transducer (probabl
y via the airframe ground) c- measure the resistance between the two free en
ds - this should measure the same as for the transducer alone - about 240 oh
ms. If not then there is a wiring issue between the transducer and the sens
e terminal or to ground. Fix this if it not correct.
If necessary run a new wire between the gauge and the transducer terminal, a
nd run a new ground wire between the case of the transducer to the gauge gro
und. Retest for the 240 ohms.
3. Check the airframe ground connection (this is the negative of the battery
, or the engine case) to the transducer case. The should be less than 0.1 oh
m. If not find out why and fix.
4. Finally check the gauge itself - get hold of a 100ohm resistor - wire it b
etween the gauge sense terminal and the gauge ground. Gauge supply terminal
should already be wired to the supply - this should be 12-14 volts relative
to the ground. Gauge ground wired to ground. With the 100ohm resistor in p
lace and power applied the gauge should indicate close to 50psi. If it does
your gauge should be ok.
Much easier to do than to describe.
Doug
Sent from my iPad
On 21/04/2012, at 4:55 PM, "R.C. Flyer" <smirdrv@hotmail.com> wrote:
> Doug,
> I installed a new sending unit from ACS this evening and fired up the O-32
0-160........same, same. I checked the connections under the dash in the cow
l; found a loose connection. So I put a new connector on the end and tighten
ed it down.. no joy. I have this meter pictured, but am a novice and not sur
e how to set it up to check the values on the gauge. Is this something that a
shop can check is I take it in to them? I also have an ACK-30 encoder that
doesn't want to transmit the altitude. Would that have to be checked in the
plane, or can it be bench checked? Thanks.
>
> R.C.
>
>
> Subject: Re: RV-List: Oil Presure Gauge
> From: dgra1233@bigpond.net.au
> Date: Sat, 14 Apr 2012 09:37:15 +1000
> To: rv-list@matronics.com
>
> Some data points that may help:
>
> For a working Vans Oil Pressure gauge....
>
> The transducer should measure about 240 ohms at atmospheric pressure (zero
) - mine measured 238 ohms.
>
> I tested the gauge with fixed value resistors,
>
> 152 ohms gave 23 psi,
> 98ohms gave 51psi,
> 60 ohms gave 81 psi and
> 41ohms gave 95psi.
>
> So armed with a multimeter you should be able to track down where you have
a problem. A poor contact in the circuit will increase the resistance indic
ating a lower pressure, but any number of Faults could give the indication.
>
> I recommend you do not fly without resolving the issue.
>
> Doug
>
>
> On 14/04/2012, at 4:36 AM, "R.C. Flyer" <smirdrv@hotmail.com> wrote:
>
> Thanks to you all for your input. Weather permitting, I'll locate the iss
ue and report the findings.
> R.C.
>
> From: johnd@wlcwyo.com
> To: rv-list@matronics.com
> Date: Fri, 13 Apr 2012 09:29:32 -0700
> Subject: RE: RV-List: Oil Presure Gauge
>
> I had the same problem with Van oil pressure gauge, except mine would be o
k at startup and after 15 or 20 minutes it would show 25 to 30 psi.
>
> I replaced the sending unit twice. Luckily I also installed an idiot light
with pressure sender for the light at 45 psi. The light never came on. I in
stalled the idiot light so I wouldn=99t forget to turn the master off a
t shutdown.
>
> I ended up replacing the gauge with a Electronic International oil pressur
e and oil temp combination gauge. After replacement oil pressure stayed at 7
0 psi and never wavered.
>
>
>
> John L. Danielson
> Senior Engineering Technician
> WLC Engineering, Surveying & Planning
> 200 Pronghorn St., Casper, WY 82601
> 307-266-2524
>
> <image001.jpg>
> From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matr
onics.com] On Behalf Of Tom & Cathy Ervin
> Sent: Friday, April 13, 2012 5:43 AM
> To: rv-list@matronics.com
> Subject: Re: RV-List: Oil Presure Gauge
>
>
>
> R.C.,
> I have all the Van's gauges in my panel with the exception of voltage
& manifold pressure and never had an issue in 100 plus hours.
> Check all your connections...good grounds are a must...to make sure t
hey are clean and tight. If everything looks flight ready then I would start
by checking the sending unit to make sure it's functioning properly.
> Tom in Ohio RV
6-A
>
> I have an Oil pressure gauge that came with the project I purchased. I've b
een flying with it for just a few hours and yesterday after start up, the ga
uge wouldn't rise above 20psi. The gauge has a picture of Van's Plane @ the b
ottom. I seem to remember hearing about these not being very reliable. Does t
his sound familiar to anyone? After checking under the cowl, then idling for
a while and monitoring the CHT & Oil temps, I took a couple of circuits aro
und the pattern.....all was normal except for the lack of Oil pressure at it
's usual reading. I plan on pulling the pressure line from the engine to the
sending unit to verify that it is not clogged, and already checked the sign
al line to the gauge. Any other suggestions? Thanks in advance.
>
> R.C.
>
>
>
>
>
>
> get=_blank>http://www.matronics.com/Navigator?RV-List
> ttp://forums.matronics.com
> =_blank>http://www.matronics.com/contribution
>
> <DSC01027.JPG>
Message 2
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| Subject: | Re: Oil Presure Gauge |
Or maybe one could use a "real" oil pressure gauge with an oil line
coming to it. The downside would be the possibility of leaks inside the
cabin area. :(
On 4-21-2012 12:17, Doug Gray wrote:
> R.C.,
>
> Yes a shop could sort this out for you, just apply cash.
>
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