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Strange EGT Readings (Read 628 times)
Apr 14th, 2018 at 9:23am

BRAU   Offline
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I love flying!

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New install Rotax 912 using D180 and the EGT readings seem wrong.
When the system is turned on it displays -99 on both probes. I happen to have an oven and process calibrator so I did a little testing and had the following results. All readings are in Degs F.
OVEN     D180 LEFT        D180 RIGHT         Process Calibrator
150         -99                      -99                      149.6
200         -68                      -68                      198.0
250         -15                      -17                      247.7
300           52                       27                      298.7
350         101                       75                      350.0
400         140                      111                     398.7
450         197                      156                     449.0
Probes read correct when connected to the Fluke process calibrator and wrong when connected to the D180.
Any suggestions?
Thanks
Brad
 
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Reply #1 - Apr 14th, 2018 at 3:53pm

Don Jones   Offline
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Brad, we solved one with the exact same issue a few months ago. I will do some research when I am back at work Monday and get you a solution. I don't remember the solution off the top of my head.
« Last Edit: Apr 14th, 2018 at 3:53pm by Don Jones »  

Don Jones
Technical Support Manager
Dynon Avionics
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Reply #2 - Apr 17th, 2018 at 8:16am

Don Jones   Offline
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Ok Brad, What happens if you short out the two leads from one of the thermocouples. (it should show ambient temp)  If you disconnect the 25 pin EGT/CHT connector does it still read -99?  If it fails either test above,  the unit will need to come back for us to check it out and repair it.  Give us a call 425-402-0433
 

Don Jones
Technical Support Manager
Dynon Avionics
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