>They function like an on-off switch in the presence
> of Oxygen. NO oxy, off, ANY oxy, on.
http://www.conservatory.com/vw/manuals_nyx/Images/FeulInjection/L-JetronicLambda/LJETL-18.GIF
That's really not true. While the slope is quite steep at stochiometric
conditions, there is a slope, with
a radiused curve. The above link shows a typical profile of this.
This slope allows a properly calibrated electrical device to indeed reflect the
different excess air
ratios in a display. I have seen them in use, and they do indeed do this. The
range of effective
sensitivity and display is restricted, but that is quite acceptable for most of
us as we are not
going into incombustable ranges.
The gauges have a wonderfull usefullness with carburetors for detecting and
identifying
improper fuel mixtures at operating conditions other then idle. Very helpfull
in selecting
a needle profile with SU's, or altering emulsion tubes and such with more
typical fixed
jet carburetors.
Even with fuel injection though, the gauges still read quite well due to
dampening
circuits wired into them. Be it the led display type, or the analog needle
unit.
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