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I dont have an answer for you, but a comment. I have a cheapie narrow band O2 sensor (< $30 at Auto Zone) driving my AutoMeter O2 instrument in the panel. When I added the EFISM I asked Ed if one O2 sensor would drive both and he didnt know. So I tried it and it works fine. No change in the AutoMeter indicator and the EFISM tracks it perfectly. I think the inputs on both the gauge and the EFISM are very high impedance and dont present much of a load on the O2 sensor. Just a data point.
Mike Wills
RV-4 N144MW
----- Original Message ----- From: "Christopher Barber" <CBarber@TexasAttorney.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, July 01, 2009 1:44 AM
Subject: [FlyRotary] Conflict in read
Another question that may be more suited for Tracy (but I hate bothering him ever and I still hope to make progress while he is away), however, I was re-reading both the manuals for the EC2 and EM2 and looking at the pin out sections for the d-sub connections. I noticed that for the EC2 it shows pin 28 being for the O2 sensor, however, in the EM2 Manual it shows pin P2-8 as also being for the O2 sensor.
Currently mine is only hooked up the the EM2 P2-8 pin. I do not ever recall that there should be two O2 sensors installed and I was under the impression that you would not have two leads off of one sensor to two different instruments. So, what line of text did I miss (not unheard of and one of the reasons I keep re-reading the manuals....as I experience more, some of the stuff makes more sense with an additional reading even though I doubt I will ever "get" the calibration stuff...sigh) about where the 02 sensor should be connected to. Is it preferred to go the the EM of the EC....or do you have a two wires from 02 sensor, one to the EM and one to the EU....or something else all together?
Thanks.
All the best,
Chris Barber
Houston
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