KR> Re: Mixture Meter Update

[Deems Herring]

If you are looking for a wide band O2 for an EFIS display check this: 
http://www.innovatemotorsports.com/products/lc1.php It has a programmable 
output with a max of 0-5V. I usually set mine up for AFR 10 to 20 = 0V to 5V. I 
have been using these on many engines for over 5 years now and the first one I 
bought is still working. For leaded fuel I just change the sensor annually 
(about $80). These used sensors have worked fine in unleaded use after that. 
These sensors have a porous ceramic that the lead plugs up. A much worse thing 
for the sensors is non sensor safe RTV (silicone) sealer, this can kill a 
sensor in a matter of a couple hours and seems to affect the sensor long after 
it is cured.

Check out Innovates forum for some good info on O2 sensors in general and the 
LC-1 in particular.

Deems

A satisfied Innovate customer.


> From: smw...@md.metrocast.net
> To: kr...@mylist.net
> Date: Wed, 8 Jun 2011 09:37:27 -0400
> Subject: KR> Re: Mixture Meter Update 
> 
> Most of the wide-band single wire O2 sensors are 0-5 volt devices.

KR> Re: Mixture Meter Update

[smwood]

Most of the wide-band single wire O2 sensors are 0-5 volt devices.  However, 
they have high impedance outputs, which means you have to connect them to a 
high impedance input - in the megohm range.  Otherwise you load down the 
sensor output and get no useful information.  Most analog voltage inputs for 
tach, oil pressure, etc. are usually 15Kohm and not suitable for direct 
connection to a single wire O2 sensor.  A buffer amplifier is needed to make 
the impedance transfer.  Apparently the Xtreme EFIS has the proper buffer 
amplifier built in.

The O2 sensors that use a controller will usually have a 0-5 volt output for 
data loggers.  These will usually have a dedicated display also.  The 
controller type O2 sensors usually have 4 or 5 wires and have to be 
dedicated to a particular controller.  The 0-5 volt output from the 
controller is way downstream and isolated from the O2 sensor.

Bottom line here is:  If you are not sure about the electronics set up, use 
the packaged system (The O2 sensor, controller, display and harness) from 
one vendor.  Most systems have choices for display type (analog or digital) 
and data logger outputs for your own custom display and/or recording.

And the standard disclaimer: 100LL contains lead that will clog the O2 
sensor in about 100 hours operation and render the sensor as a throw-away.

Sid Wood
Tri-gear KR--2 N5242
Mechanicsville, MD, USA
smw...@md.metrocast.net
--

Hi Sid
Just a note on mixture meters, I was looking over the MGL websight the other
day and noticed that their Xtreme EFIS has that facility built into it. All
it needs is an O2 sensor hooked up to it. It would appear the Xtreme is also
a full EIS with data logging facility for later engine analysis. With built
in GPS it seems a good bang for your buck. It also fits into a standard
large instrument hole.
Regards
Dene Collett
Avlec Projects
Port Elizabeth
South Africa.

--

 Hi Gang, contacted Dynon on this issue and they don't support it.
They have Variable voltage inputs though so if you could amplify the
O2 sensor output to Zero-to-5v it possibly could be done.


Paul Smith
Brisbane, AUSTRALIA
pk.sm...@bigpond.net.au
http://kr2spacemodulator.blogspot.com/