[Diy_efi] Source for inexpensive fuel/oil pressure sensors?

[David Allen]

  I 've used a "sender" for a transducer before and it worked. But only 
after I carefully logged the resistance versus pressure curve and programmed 
a PIC to interpolate this table into a linear "transducer-like" output.
  Still cost less than a real transducer but what a PITA just to save a few 
$.  The curve on these elcheapo senders is horrible. Repeatability sucks, 
and they degrade over time.  The sensing element is a bourdon tube with a 
copper "arm" rubbing on nichrome wire.  It wears noticabley in a few hundred 
hours of use.
  The following company supplies the OEM I work for with transducers that 
are not too bad expensive and are a very nice piece. We use the 300 series 
in a pressure/ vac; 100 PSIa, 150PSIa, 1000PSIa and 10,000 PSIa versions. 
I've 'copped' a couple used ones and have great success datalogging with 
them while tuning my engine.
  They even sell online.
http://www.meas-spec.com/myMeas/default/index.asp
  Hope this saves you some time!
David



----- Original Message ----- 
From: "Daniel Nicoson" <A6intruder at myo-p.com>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, December 27, 2006 3:08 PM
Subject: RE: [Diy_efi] Source for inexpensive fuel/oil pressure sensors?


>I think the oil pressure "sender" on my Mustang costs $6.00 at NAPA.  It's
> really just a variable resistor.  I'm not sure what the response curve is
> but it shouldn't be too hard to figure out if you have a pressure gauge 
> and
> a pressure source.  Of course your control circuit would have to interpret
> this variable resistance to be of use.
>
> Dan Nicoson
>
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of Geddes, Brian J
> Sent: Wednesday, December 27, 2006 3:59 PM
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] Source for inexpensive fuel/oil pressure sensors?
>
> Hey all -
>
> I'm looking for a source for inexpensive pressure transducers.  I've
> seen lots in the $100-$150 range, but I'm willing to bet that they can
> be had for significantly cheaper.  :)
>
> 1/8 or 1/4 NPT fitting, 5VDC (or 12VDC) power, 0-5 VDC output.  Need to
> tolerate oil/fuel.  100 or 150 PSI would be perfect.
>
> Any ideas?
>
> Thanks,
> - Brian Geddes
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