Issues with Aithre Shield CO meter

[russp]

Linked an Aithre Shield CO meter into my Dynon HDX - as far as I can tell in accordance with the instructions regarding the correct pins on the EMS D39plug .. loaded up the sensor file from Aithre and set up the sensor as per the instructions and I now have two problems - the first is that the voltage being read by the skyview HDX is 1.65 which relates to a CO reading of 100PPM which is well into the danger zone.. in a hanger with the doors wide open and no engines on in the vicinity for hours! Could be the sensor o9r possible a result of my connecting it wrong? The second is the dynon widget file uses the voltage read to 'convert' to PPM by using a pressure conversion relating to psi.. but my HDX uses bar as pressure units .. looks like I'm going to need to edit the widget file manually? Anyone know what it needs editing to? Any ideas?

 

[n28et]

Hi, I too have the Aithre Shield CO monitor wired into my Skyview. Like you I was getting very high readings on the sensor. I talked with Jim, the owner at OSH and he explained that the hi reading is a self check function at power up. After a couple of minutes the reading should read the actual CO. Hope that helps.

 

[djones]

Jim from Aithre contacted me earlier in the week and they had made a small change to new modules that is causing issues with the reading
on the SkyView. You might want to talk to him about it before spending much time with it.

 

[jimRuttler]

I was pinged by a customer regarding this thread. The EX 2.0 and EX 3.0 are programmed to output 3.3V or 255 ppm for 1 minute on startup. After that, the voltage will drop to 0V or 0 ppm with clean air. The output of the CO will be 0-3.3V linear to 0 to 255ppm after the 1 minute startup. You can troubleshoot by measuring the white wire on startup with a volt meter (red probe on white and black probe on ground). It should read 3.3V for 60 seconds after power is applied, then 0V. If you are measuring these values, but getting something different through your Dynon, Don Jones can help you. If you are measuring something else (e.g., 1.1V or some other random number), we can help you. -Jim Ruttler

 

[Rhino]

For everybody viewing this thread, Jim Ruttler is the President and inventor/founder of Aithre, and Don Jones is the (a?) Technical Support Manager at Dynon.

According to LinkedIn there's also a Don Jones who's the janitor at Calvary Baptist Church in Sioux Lookout, Alberta, Canada, but I'm betting this post wasn't about him.