---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 08/15/19: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:38 AM - TC wire and dsub (Jan de Jong) 2. 07:28 PM - Re: TC wire and dsub (Robert L. Nuckolls, III) 3. 07:58 PM - Flaky EGT Probe (Art Zemon) 4. 08:32 PM - Re: Flaky EGT Probe (Jared Yates) 5. 11:01 PM - Re: Flaky EGT Probe (Bob Verwey) ________________________________ Message 1 _____________________________________ Time: 06:38:57 AM PST US Subject: AeroElectric-List: TC wire and dsub From: Jan de Jong Theoretically, extending thermocouple wires using a dsub connector (with, say, gold over bronze contacts) should be ok provided any temperature gradient across the connector is ignored. The thermocouple voltages across the connector cancel out to 0. In practice there could be a problem with corrosion of a thermocouple wire where it meets gold. Is there experience? Thanks, Jan de Jong ________________________________ Message 2 _____________________________________ Time: 07:28:59 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: TC wire and dsub At 08:36 AM 8/15/2019, you wrote: > >Theoretically, extending thermocouple wires using a dsub connector >(with, say, gold over bronze contacts) should be ok provided any >temperature gradient across the connector is ignored. The >thermocouple voltages across the connector cancel out to 0. > >In practice there could be a problem with corrosion of a >thermocouple wire where it meets gold. Gold is electrolytically inert. I think most thermocouple alloys are similarly resistant to oxidation. I've run TC wires though d-subs for decades with good success . . . with one caveat: My tasks were temporary instrumentation installations so I've not personally observed/demonstrated longevity in field service. But given the low reactivity of the alloys involved, I'm pretty confident that they'll last a long time. Bob . . . ________________________________ Message 3 _____________________________________ Time: 07:58:26 PM PST US From: Art Zemon Subject: AeroElectric-List: Flaky EGT Probe Folks, One of my four EGT probes is flaky. Sometimes it works. Most of the time it reads zero (too low to register). I don't actually use the EGT for anything so I'm not very excited about spending money to fix it. But it annoys me to see three nice green bars and one black space where there should be a green bar. Are these things repairable? -- Art Z. -- https://CheerfulCurmudgeon.com/ *Love the stranger for you yourselves were strangers in Egypt. *Deut. 10:19 ________________________________ Message 4 _____________________________________ Time: 08:32:02 PM PST US From: Jared Yates Subject: Re: AeroElectric-List: Flaky EGT Probe Art, you seem like the kind of fellow who would appreciate a lengthy blog post: http://bearhawkblue.com/replacing-the-oem-dynon-thermocouple-connectors-with-omega-connectors/ On August 15, 2019 23:05:01 Art Zemon wrote: > Folks, > > One of my four EGT probes is flaky. Sometimes it works. Most of the time it > reads zero (too low to register). I don't actually use the EGT for anything > so I'm not very excited about spending money to fix it. But it annoys me to > see three nice green bars and one black space where there should be a green > bar. > > Are these things repairable? > > -- Art Z. > > -- > https://CheerfulCurmudgeon.com/ > > *Love the stranger for you yourselves were strangers in Egypt. *Deut. 10:19 ________________________________ Message 5 _____________________________________ Time: 11:01:53 PM PST US From: Bob Verwey Subject: Re: AeroElectric-List: Flaky EGT Probe Hi Art So how is it that you dont use your EGT? To me it is a prized tool in the engine management arsenal! On Fri, 16 Aug 2019 at 05:03, Art Zemon wrote: > Folks, > > One of my four EGT probes is flaky. Sometimes it works. Most of the time > it reads zero (too low to register). I don't actually use the EGT for > anything so I'm not very excited about spending money to fix it. But it > annoys me to see three nice green bars and one black space where there > should be a green bar. > > Are these things repairable? > > -- Art Z. > > -- > https://CheerfulCurmudgeon.com/ > > *Love the stranger for you yourselves were strangers in Egypt. *Deut. > 10:19 > -- Best... Bob Verwey 082 331 2727 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.