REFLECTOR: EGT/CHT probe harness lengths and terminal block

[Ron Brown]

Andy,

The GRT EIS comes with a harness with the correct materials.  Connections 
are made in the engine compartment using spade connectors to the probes.  I 
ordered 25' long harnesses - better to be a little long than too short!

The extension wires do need to be the same materials as the thermocouples - 
else you will get errors due to the non similar metal junctions in the 
engine compartment.  You could use a terminal block for these connections, 
but the extension wire does need to be the correct thermocouple wire.

Ronnie
2003 173 Elite RG for Sale - see http://home.adelphia.net/~romott/


----- Original Message ----- 
From: "Andrew Ellzey" <ajlz72756 at yahoo.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, November 24, 2007 12:36 AM
Subject: REFLECTOR: EGT/CHT probe harness lengths and terminal block


> 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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