REFLECTOR: EGT/CHT probe harness lengths and terminal block

[Scott Derrick]

Make your connections from the probe wires to the extension wire in the 
engine compartment.  Less induced error.

You could use a terminal block, but most just use spade connectors 
because the probe wires aren't long enough to reach the firewall which 
means you will be mounting the block on the engine mount or engine.

I used 22 gauge thermocouple wire for my extension and it works great.

Mine is a Dynon unit.  I bought the extension wire from Omega. They sell 
  multiple twisted pair cable of type J & K.

Scott

Andrew Ellzey wrote:
> Question for the collective. What is everyone doing when ordering CHT and EGT probes as for cable lengths? I am installing BM EFIS one system and a Lycoming IO-540. Can a terminal board be added on the inside of the aircraft firewall to make a disconnect point for future probe changes and to make the harnesses reach? I have the BM built A3 sensor harness and the wiring from BM is unshielded 22 gauge wiring for the CHT and EGT inputs. This seems to be a mistake on their part. Westach sells extension leads up to 12 feet that is supposed to not affect accuracy. Is the the correct way to go with a terminal block inside the aircraft firewall? Has anyone used standard 22 gauge wiring and not had problems with probe accuracy? BM sensor inputs are completely programmable.
>  
> Andy Ellzey
> XLRG
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