NTK UEGO calibration

[Jason Haines]

I thought I had posted the calibration gas mixtures before (I know I have
emailed them to people privately). I don't have them memorized or have them
at home so I'll post the gas mixtures for different AFR's from work or bring
them home and post them from home. Some of the gas mixtures used by the
emissions stations for calibrating the 4 and 5 gas emissions analyzers can
be used for testing an O2 sensor and these mixtures aren't too expensive. It
also depends on how accurate you want, the more accurate you want, the more
it costs.

We have a calibration fixture at work that allows us to test 8 wide band O2
sensors at the same time. As I have already emailed a couple of people
privately, I would be willing to test a few of the first DIY wide band
meters on the fixture and compare the results to our Horiba and Bosch wide
band meters.


Jason


----- Original Message -----
From: "Barry Tisdale" <btisdale at cybersol.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, August 21, 2001 8:35 PM
Subject: RE: NTK UEGO calibration


> Heater in the WB sensor *will* ignite a propane or butane mix w/ air -
> detonate is more like it.  Did that.
>
> I'm just a minor in chem from 40 years ago, so its a bit misty....really
> dunno how these things work.
>
> I used argon/CO2 MIG mix to get stoich; ran a couple of WBs, compared to
> the switching of a NB sensor.  Used a 1 qt Mason jar w/ holes in the lid
> for the sensors & small hole to admit gasses.  Convection from the
> heater(s) mixes things well, adding a very small muffin fan didn't change
> anything.  Starting w/ air in the jar (offscale lean), running argon in,
> AFRs fall to 14.7:1.  Adding propane or butane at this point is safe, but
> doesn't take much to *really* swing the AFR rich.  Far as I can tell, *no*
> O2 and *no* hydrocarbon = stoich - add either O2 or hydrocarbon gas to get
> the full range of AFRs.
>
> Short of a bomb deal, I couldn't come up w/ a reproducable means of mixing
> known amounts of gasses & come up w/ a 'cal' gas.  These are available
> commercially, mostly for EPA stuff & come w/ all sorts of assays &
> certificates w/ a price tag to match - try BOP gasses.
>
> Barry
>
> At 04:39 PM 8/21/01 -0400, you wrote:
> >For those of us that are not chemists, is there a cheap way that is
> >also safe (not that I don't like to blow things up as long as I am not
> >one of those things).
> >
> >What about Propane?  Or Butane?  Something readily available, and if
> >so how would one go about testing?  Will the heater in the O2 sensor
> >start an explosion with Propane or other?
> >
> >Where would one get nitrogen or argon?  Is there an easy way to make
these
> >gases (that is also safe)?
> >
> >Thanks,
> >
> >Steve F
> >
> >-----Original Message-----
>
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