Return-Path: Received: from sam.the-i.net ([206.136.176.251]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 29 Aug 2000 12:05:20 -0400 Received: from pavilion (ccb114.the-i.net [206.136.177.114]) by sam.the-i.net (Vircom SMTPRS 4.2.181) with SMTP id for ; Tue, 29 Aug 2000 11:10:42 -0500 Message-ID: <001501c011d4$51884d40$72b188ce@pavilion> From: "J. N. Cameron" To: "Lancair List" Subject: Connectors in OAT wiring Date: Tue, 29 Aug 2000 11:15:12 -0500 X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> There was a mention today of someone putting a Molex connector on their OAT probe. Keep in mind that most OAT probes are thermocouples, which generate tiny voltages at almost no current. Using ordinary types of connectors on the thermocouple wire adds additional thermocouples, which are, after all, simply connections of two dissimilar metals. Any connectors used should be special thermocouple connectors, made for the same type thermocouple as the OAT probe (i.e., chromel, alumel, type K, or whatever), and the extension wire should also be the same type thermocouple wire. Polarity is marked on the connectors and must be followed. The OAT meter will always give some sort of indication, but unless you are careful with the TC wiring, you won't have any idea what your real OAT is. The simples thing is to figure out your mounting location before ordering, then specify the wiring length when you buy your OAT instrument. [More connectors = more problems!] Jim Cameron, ES builder [Good to be back from down under -- might actually get back in the hangar soon.] >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>