CO Guardian Configuration

PeterMac

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Mar 5, 2018
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8
I'm hoping someone can help me get my Guardian 353D-101 CO Monitor configured on Skyview.

I've followed what limited information I could find, and have it working via enhanced input Pin 23 on my EMS, however it shows a reading of around 165ppm when just sitting in the clean air of my well ventilated workshop. There's no way this reading is accurate.

When mapping the input I selected Function = Pressure, and Sensor = CO Guardian 353N-201. I note that despite the 353D being advertised by Guardian as specifically for the Dynon Skyview, it doesn't rate a mention in the list of available sensors.

When I look at the Sensor Debug data on my Skyview I note the following:
* RAW: 543
* CAL(V): 0.6622
* VALUE: 165.5
The Skyview displays 166.

When I press the TEST button on the CO Monitor the sensor data reads full scale, as follows:
*RAW: 4094
*CAL(V): 4.9976
*VALUE: nan
The Skyview displays a red cross, indicating off scale.

What am I doing wrong, and how do I correct it?
 

PeterMac

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Mar 5, 2018
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I found an archived thread from five months ago titled "Added: CO Guardian Support", which, at the end of the thread, shows some communication between Dynon's djones and forum member Lee_Kitson relating to my exact same problem. See a screenshot of the last few posts below.

Was there ever any resolution to this?

Forum Screenshot 190322.jpg
 

PeterMac

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Mar 5, 2018
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I feel like I'm talking to myself here. I've now sent emails to both Guardian and Dynon Support seeking advice.

Out of interest, has anyone managed to set up a Guardian 353D CO Monitor on their Skyview system, and have it display a ppm value that seems realistic?
 

djones

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Jul 19, 2010
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I have reached out to Guardian in an attempt to get to the bottom of this.. I should have more info soon.
 

PeterMac

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Mar 5, 2018
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Well, I found the problem. It was my own doing all along. I'd wired the EMS input from the wrong pin of the CO Monitor. Very embarrassed, but also very thankful and appreciative for support offered from Jose Ortiz (Guardian Avionics), Don Jones (Dynon), and fellow Guardian 353D CO Monitor user Keith Smith.

Through all of this I have at least now worked out how to do the math to make the 353D series CO Monitor read correct ppm on a Skyview system. Please send me an email at petermac65@dodo.com.au if you want some help with this. It's not as straight-forward as it seems.
 
Last edited:

swatson999

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Oct 6, 2010
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1,082
I looked at CO Guardian, then found out about Aithre. Much cheaper, integrates with Skyview, 10-year life, etc. Picked one up at OSH and will install it this week while the plane is down, and report back (but my buddy has one and says that it works perfectly with his AFS). None of that fiddly stuff everyone is talking about with CO Guardian.
 

PeterMac

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Mar 5, 2018
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There's still the "fiddly stuff" with the Aithre product. They just address it in the installation instructions by saying to contact Don Jones at Dynon.
 

swatson999

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Oct 6, 2010
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Who sent a .sfg file with everything already set up, apparently (we'll see once I get it hooked up), requiring only a "fiddly" upload. :)

As I said, I'll report back how easy/difficult it is to install and set up the Aithre, but I'm hopeful.
 
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