EGT reading over range

RVDan

I love flying!
Joined
Aug 8, 2012
Messages
282
Location
Frederick, MD
On my Skyview, I have a single EGT probe that is reading over range and X'd until the engine is started, then it looks normal.  If I disconnect the probe the reading shows low (but not X'd). 

I have swapped probes and the problem moves with the probe, so I have a probe problem, but it seems like an odd failure.  An open probe results in a low reading.  I am not aware of a thermocouple failure that can drive the channel excessively high at ambient temps and act normal with elevated temps.  I can duplicate the problem with the probe isolated from ground and heating the probe with a torch, so no odd grounding issues.  These are Dynon probes. Nothing else is on in the aircraft except Skyview so that somewhat limits potential EMI issues.

Any ideas?
 

Dynon

Dynon Staff
Staff member
Joined
Jan 14, 2013
Messages
14,232
Location
Woodinville, WA
Nothing is immediately coming to mind. Like you said, it sounds like an odd degradation of the probe. When in this condition, what do you see under EMS SETUP > SENSOR DEBUG DATA for this EGT. What does one of your normal ones say?
 
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