X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from host.roblinphoto.com ([72.52.218.78] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTPS id 2641728 for flyrotary@lancaironline.net; Sat, 12 Jan 2008 00:00:18 -0500 Received-SPF: pass receiver=logan.com; client-ip=72.52.218.78; envelope-from=bob@bob-white.com Received: from c-68-35-160-229.hsd1.nm.comcast.net ([68.35.160.229]:55256 helo=quail) by host.roblinphoto.com with esmtpa (Exim 4.68) (envelope-from ) id 1JDY8u-0000tw-FF for flyrotary@lancaironline.net; Fri, 11 Jan 2008 23:38:48 -0500 Date: Fri, 11 Jan 2008 21:58:30 -0700 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] General OAT Wiring Question Message-Id: <20080111215830.be3306d6.bob@bob-white.com> In-Reply-To: References: X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.0; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - host.roblinphoto.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bob-white.com Hi Doug, Trying to connect the single temperature sensor to two instruments isn't likely to work. There are several different types of devices used for measuring temperature. The EM2 is supplying 5V to the EM2 sensor, and you don't want to be connecting voltage sources from two different instruments together. I have no idea what the RMI is using but connecting them together isn't a good idea. You can still use the EM2 sensor to measure whatever you like. Just remember that the OAT reading on the EM2 is something else and read OAT only on the RMI. The EC2 temperature sensor must be used to measure the air intake for the combustion air as that temperature affects your mixture. Bob W. On Fri, 11 Jan 2008 22:58:26 EST DLOMHEIM@aol.com wrote: > I have a Rocky Mountain Instruments Uencoder in my panel and already have an > OAT temperature sender associated with that; so I was wondering if I could > just run a "Y" from that shielded wire when it gets to my panel with one lead > going to the RMI and the other to my EM2 for OAT display. My possible > concern would be if this might cause some unacceptable errors in the temperature > measurement. > > If is feasible to do this it would allow me to use the OAT sensor that came > with the EM2 for other tasks such as sampling the air temp coming out of the > radiators, etc. > > Doug Lomheim > RV-9A, 13B > OK City, OK > > > > **************Start the year off right. Easy ways to stay in shape. > http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489 > -- N93BD - Rotary Powered BD-4 - http://www.bob-white.com 3.8 Hours Total Time and holding Cables for your rotary installation - http://roblinstores.com/cables/