AeroElectric-List Digest Archive

Fri 11/21/08


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 05:08 AM - Thermocouples connected to Dynon EGT CHT (Sam Hoskins)
     2. 09:00 AM - Re: Thermocouples connected to Dynon EGT CHT (rampil)
     3. 09:05 AM - Re: Thermocouples connected to Dynon EGT CHT (ROGER & JEAN CURTIS)
 
 
 


Message 1


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    Time: 05:08:36 AM PST US
    From: "Sam Hoskins" <sam.hoskins@gmail.com>
    Subject: Thermocouples connected to Dynon EGT CHT
    Please help me work through this. 1. I am reusing my old Westach EGT/CHT thermocouples, type J & K. They appear to be shielded and have 48" leads and will need new terminals. 2. I have a pre-fab TC harness from Stein Air (for Dynon), which is made from a non-copper wire. It seems to be pretty stiff. The EGT lead wires, under the sheath, are rust/yellow. The CHT wires are rust/white. This harness wire is way too long and needs to be shortened. My questions are: A. Due to the crazy airframe, it is not uncommon to pull the engine at annual inspection time. What would be the best connector to use? Could I use a D-sub? The connection to the D180 is a 25 pin D-sub. B. For temperature accuracy purposes, would it be better to position the connector forward or aft of the firewall? The most convienient would be forward. Thanks, in advance. Sam www.samhoskins.blogspot.com


    Message 2


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    Time: 09:00:04 AM PST US
    Subject: Re: Thermocouples connected to Dynon EGT CHT
    From: "rampil" <ira.rampil@gmail.com>
    Hi Sam, If you are talking about a connector on the firewall, use a metal circular connector i.e., AMP. Do not use a a db submini for three reasons: They are not deep enough to pass through most firewalls, they provide no thermal insulation and are not rated for constant hi temp environment, and they are not gas tight against carbon monoxide etc. AMP makes special pins for TC connections, but I have never seen anyone ever use them. Just live with the relatively tiny errors due to the extra junction -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=215559#215559


    Message 3


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    Time: 09:05:49 AM PST US
    From: "ROGER & JEAN CURTIS" <mrspudandcompany@verizon.net>
    Subject: Thermocouples connected to Dynon EGT CHT
    My questions are: A. Due to the crazy airframe, it is not uncommon to pull the engine at annual inspection time. What would be the best connector to use? Could I use a D-sub? The connection to the D180 is a 25 pin D-sub. B. For temperature accuracy purposes, would it be better to position the connector forward or aft of the firewall? The most convienient would be forward. Thanks, in advance. Sam The 25 pin d-sub is a good choice. Use the ones with the crimped pins, since soldering of thermocouple wires is not recommended. You can use these forward of the firewall with very little degradation of accuracy. The important thing with using a nonthermocouple material connector is that both sides of the connector should be at the same temperature, otherwise greater error will be introduced. Roger




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