X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=PKtNwriC c=1 sm=1 tr=0 a=qClb9Ql7wM4GXenlcXDlgg==:117 a=7ZeHUF5TpD32QnDE67vapA==:17 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=2ur7OfE09M0A:10 a=r77TgQKjGQsHNAKrUKIA:9 a=HZJGGiqLAAAA:8 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=IOObp12nAAAA:20 a=_6GpL_ENAAAA:8 a=2N7R6oliF86CkvdvJVcA:9 a=QEXdDO2ut3YA:10 a=4PR2P7QzAAAA:8 a=xq-C9Ut15biOsou8nSEA:9 a=F9ixIkaQJtolVT3X:21 a=_W_S_7VecoQA:10 a=Urk15JJjZg1Xo0ryW_k8:22 a=4dqwQCo7Po2mVW515mGf:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-yb1-f174.google.com ([209.85.219.174] verified) by logan.com (CommuniGate Pro SMTP 6.2.10) with ESMTPS id 11997605 for flyrotary@lancaironline.net; Fri, 14 Dec 2018 10:24:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.219.174; envelope-from=ceengland7@gmail.com Received: by mail-yb1-f174.google.com with SMTP id r11so2386864ybp.12 for ; Fri, 14 Dec 2018 07:24:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=6/5WQUndJUnjutDRjw5Lh8u7YZdNvvOMpfDpponJ1XI=; b=IHq9jAvnskQle/WHdvpYL19SCLSKDe5GUQnJTVNp9dIGmdUsds3FVCcJuvZjI1LsQn RpGxQnHVjaDnxr9W1KDH5P39ZU/E58+1WikNAav1WnJ3TEkdZydmgElk6JPUcASXgesX T9E0AB5xpXh9Fmg3t2lI2riHm6/udAYnoMR2IBYa/2QcrMlFiVdRM3i+NsPPfu1vBUtV G82NNO+HzU0B522FpbUXwPaKy7Cutgu6W+Q+2KC4yz/Hh3y+reDHFtwKXxCJ66hY2xUf bVHiWuQfxQXTvd27y819g0YYnfdd9rzDUVgTPNt9JGbQ9L45qbKY5oH5W+aIGuhSDp82 /9LA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=6/5WQUndJUnjutDRjw5Lh8u7YZdNvvOMpfDpponJ1XI=; b=Ko6S855vitoRjmY+JjHtxLV9cCDic2z+nB+FN3nxgjIUTtsGIkoj+tKpSf9jvmwahF rxK5mCR5nmytPOcMzKeQVhqmoG/33lcs345Xdj4nKJEpPbZ/tT/3BmdnahrDcGsEuByk woMa8k96K9HQLn6qDkc3kZj/6Xnhkghu1V71moMCPcG3vJO6aDzntIGDcn9Wkwx/amKM 9/7XjwFiP2u+W9RWKmbKkgfXJh606jJYf0adbqf3+viSoaYbZ3gy/C0h9UdF4LRR5cmr EU5AfpwDcKwe6WTjMYw4u8t6yxdyh0JiWdaoshZuPznojiW39CXdyRdnRyI5Pn9aw6qC QCqA== X-Gm-Message-State: AA+aEWaEKnJ966OMcixfo9wbQkv8fITebFe9blxnI7Iv9LYUyvXmdejT 3R4P8Jv8AguahpT/KRyQ8sjCtzxb X-Google-Smtp-Source: AFSGD/UPWQyFFXbKKZmD7XrhAsO+W/d/RMfnqUDFdvQuZ4HrDXl3W9KdRgqf6RlhbwUZM/9QSNILXg== X-Received: by 2002:a25:a141:: with SMTP id z59-v6mr3287858ybh.340.1544801069740; Fri, 14 Dec 2018 07:24:29 -0800 (PST) Return-Path: Received: from [192.168.10.218] (mobile-166-170-53-207.mycingular.net. [166.170.53.207]) by smtp.googlemail.com with ESMTPSA id j137sm2643024ywj.57.2018.12.14.07.24.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Dec 2018 07:24:29 -0800 (PST) Subject: Re: [FlyRotary] Re: Hey Neil, To: Rotary motors in aircraft References: Message-ID: <553be632-e8d0-522f-aec1-693292aab0ab@gmail.com> Date: Fri, 14 Dec 2018 09:27:06 -0600 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.3 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------136711F57827FD7F31C2169E" Content-Language: en-US X-Antivirus: Avast (VPS 181214-4, 12/14/2018), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. --------------136711F57827FD7F31C2169E Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit On 12/14/2018 8:57 AM, Ernest Christley echristley@att.net wrote: > > > On Thursday, December 13, 2018, 6:22:16 PM EST, Todd Bartrim > bartrim@gmail.com wrote: > > https://drive.google.com/file/d/0B9-1Iqfk8J8nZGlTb09IclNyVms/view?usp=sharing > > Todd Bartrim > > Thank you for the write up, Todd.  I'm working on a Corvair engine, > and want to get away from CHT probes with spark plug rings.  What I'm > looking to do is have a small ring terminal clamped to the end of TC > wire and then clamp that to the side of the head with a screw into a > hole tapped into the head near the spark plug. At that point, I'm > picking up the temperature of the aluminum near the plug, without the > probe being part of the spark plug installation. > > The only question I have (and why I haven't moved forward with the > idea) is, "Is it ok to ground the end of the TC wire?"  Your write-up > seems to suggest that it is. I'm not Todd, but 'it depends'. Thermocouples are made in both grounded and ungrounded configurations. The configuration has to match your measurement device's configuration. Charlie --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --------------136711F57827FD7F31C2169E Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
On 12/14/2018 8:57 AM, Ernest Christley echristley@att.net wrote:


On Thursday, December 13, 2018, 6:22:16 PM EST, Todd Bartrim bartrim@gmail.com <flyrotary@lancaironline.net> wrote:

Thank you for the write up, Todd.  I'm working on a Corvair engine, and want to get away from CHT probes with spark plug rings.  What I'm looking to do is have a small ring terminal clamped to the end of TC wire and then clamp that to the side of the head with a screw into a hole tapped into the head near the spark plug.  At that point, I'm picking up the temperature of the aluminum near the plug, without the probe being part of the spark plug installation.

The only question I have (and why I haven't moved forward with the idea) is, "Is it ok to ground the end of the TC wire?"  Your write-up seems to suggest that it is.
I'm not Todd, but 'it depends'. Thermocouples are made in both grounded and ungrounded configurations. The configuration has to match your measurement device's configuration.

Charlie

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