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EFIS Erratic Temp Readings

 
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mikepienaar09(at)gmail.co
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PostPosted: Sat Mar 06, 2021 7:24 pm    Post subject: EFIS Erratic Temp Readings Reply with quote

Hello

Update on my erratic temp readings, I shorted all the temp inputs and connected one shielded CHT temperature sensor and the problem went away. Have now replaced all CHT sensors with shielded sensors that I made up using K type thermocouple wire from Aircraft Spruce and shielded it with braid grounded at one end. Everything stable now.

I have an MGL EFIS and had erratic EGT and CHT temp readings. EGT sensors seem to be grounded already and did not cause a problem once I shorted unused inputs.

Thanks for all the help

Mike

From: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com> On Behalf Of Charlie England
Sent: February 6, 2021 4:40 PM
To: aeroelectric-list(at)matronics.com
Subject: Re: EFIS Erratic Temp Readings

snipped

Quote:


Did you put shorts across them or were they
simply disconnected?
  No, they were not shorted, simply disconnected. Will try with them shorted next week.
  I would never have thought of shorting them
  I did remove the alternator and ran the engine with no alternator and that made no difference,
  Readings were still erratic
Thanks
Mike

Hi Mike,

Can you remind us whether the engine is 'standard' mags & carb (or Bendix style injection), or if it has some combination of electronic ignition/fuel injection?

Thanks,
Charlie


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mikepienaar09(at)gmail.co
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PostPosted: Sun Apr 11, 2021 6:23 pm    Post subject: EFIS Erratic Temp Readings Reply with quote

Thanks

My readings have now stabilised after I shorted the unused "ports" and put
grounded shields on the leads

Thanks

--


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