CHT/EGT Sensor

[NC Bill]

My temp readings on #1 are erratic. They go from ZERO to RED LINE but seldom are in line with normal #2. Usually the bar is just fluctuating back and forth or just blank.

What 2 points is the probe connected to. I assume 1 is on the engine and the other on the back of the SKYVIEW.

Any suggestion short of replacing the probe appreciated.

 

 

 

[ODowneyEng]

That solution worked for me recently. While at it, clean the voltage  Regulator and secure with two wire ties. It is a matter of time before that beggar acts up too.

Roger you are the man with the Midas touch.

[NC Bill]

Sorry to say Roger, but tightening didn't solve the problem.

[cdarza]

I replaced my old (fluctuating) CHT 1 1/4 gauge part N12116V300F020 with a UMA N12116U300F000  I thought it was gonna be a simple plug and play replacement but im now getting a 300F reading just a few mins after startup.    Gonna go back to hangar tomorrow and try to figure this one out but any chance i replaced with the wrong incompatible part?

[cdarza]

I tried the new CHT gauge to the oil temp line and same prob - 170 degrees (switch on without engine running)   Am not good with electrical.  Does this now sound like a resistor needs to be added then ?  Sadly that would make the cht /oil temp not interchangeable (for testing purposes)  Argh.  Will reach out to FD or UMA but any other thoughts here are appreciated.

[cdarza]

Update FYI.    Got response from UMA.  The new gauge i bought is not calibrated to the existing probe.  Original from FD N12116V300F020     New part:  N12116U300F000   The key difference is the V and the U ....  ARGH!!   Frustrating expensive mistake for people like me that are not very knowledgeable on this.   Cheaper alternative is i shall like replace the probe to match the gauge.  

[cdarza]

Was having some elevated CHT  gauge reading issues again - With Rogers guidance, i once again cleaned and tightened the grounds.  Thus far ground run has been good.   I did notice however when i turned off the  Dynon 100/ transponder and radio,   the CHT went down 5 to 7 degrees.  (UMA Analogue gauges)  Repeated this multiple times by switching the EFIS etc on then off and got the same results.    You electrical geniuses will know whats going on - for me, its just another CT quirk :) 

[GlennM]

Grounding the EMS case to the main ground behind the panel solved years of issues I had with the oil temperature and CHTs. I would recommend looking for the ground wire or installing one because it worked so completely to fix my problems.

[Anticept]

Dynon even recommends case grounding in the install manuals, and it's really irritating that this isn't done from factory.

That said, I'd even say further that if the case itself isn't grounded internally, I'll fault dynon even more.