REFLECTOR: CHT monitor

[nmflyer1 at aol.com]

Doug, 

?You're not the only one, I did the same. Yup, a pain. Not only that, I used shielded twisted pairs to keep down noise on all my sensors... If I ever get arthritis in my hands.. I'm blaming it on this :) 

Kurt 


-----Original Message-----
From: Douglas Holub <douglas.holub at gmail.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Wed, 18 Mar 2009 8:36 pm
Subject: Re: REFLECTOR: CHT monitor


It's the minus (-) wire, and it might get tied to ground inside the RMI (although that's not the way I'd do it.)?
?
A thermocouple is like a tiny battery whose voltage changes with temperature. I've been thinking about it, and if I wanted to measure six batteries to see how their voltage changes with temperature, it would be fine to tie all their negative terminals together and measure each positive terminal individually. I wish I had given it some thought before I wired up two double-pole rotary switches for EGT and CHT. It was a pain.?
?
The RMI wiring diagram calls for a double-pole rotary switch, so I'd call Ron at RMI first if I were you. I'd be curious to know what you find out.?
?
Doug?
?
----- Original Message ----- From: <aminetech at bluefrog.com>?
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>?
Sent: Wednesday, March 18, 2009 9:54 AM?
Subject: Re: REFLECTOR: CHT monitor?
?
> Doug,?
>?
> As I understand it, one of those leads is considered a ground. According > to RMI's installation manual, the red wire is normally the ground wire.?
>?
> John?
>?
> --- douglas.holub at gmail.com wrote:?
>?
> From: "Douglas Holub" <douglas.holub at gmail.com>?
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>?
> Subject: Re: REFLECTOR: CHT monitor?
> Date: Wed, 18 Mar 2009 08:51:53 -0500?
>?
> I wouldn't think there would be any ground leads involved with CHT probes.?
> The wiring diagram for my RMI CHT probes uses a double pole rotary switch?
> that successively sends both CHT leads from each probe to the engine?
> monitor.?
>?
> Doug Holub?
> 5 hrs on N2980W, cylinders are cool, oil still hot?
> ----- Original Message ----- > From: <aminetech at bluefrog.com>?
> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>?
> Sent: Tuesday, March 17, 2009 11:59 AM?
> Subject: REFLECTOR: CHT monitor?
>?
>?
>> I'm installing a digital CHT, single readout gauge using a Westach switch?
>> to switch amoung the 6 cylinders. The wiring that comes with the switch?
>> connects all the grounds into a single lead. I assume that is not a?
>> problem? Also, the ground wires are larger and I'm wondering why??
>>?
>> John?
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