X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1448555 for flyrotary@lancaironline.net; Sat, 07 Oct 2006 18:46:42 -0400 Received-SPF: none receiver=logan.com; client-ip=205.152.59.71; envelope-from=rusty@radrotary.com Received: from ibm66aec.bellsouth.net ([65.6.194.9]) by imf23aec.mail.bellsouth.net with ESMTP id <20061007224620.NZSC13564.imf23aec.mail.bellsouth.net@ibm66aec.bellsouth.net> for ; Sat, 7 Oct 2006 18:46:20 -0400 Received: from rd ([65.6.194.9]) by ibm66aec.bellsouth.net with ESMTP id <20061007224620.YUPX6138.ibm66aec.bellsouth.net@rd> for ; Sat, 7 Oct 2006 18:46:20 -0400 From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Renesis O2 Sensor Date: Sat, 7 Oct 2006 17:46:20 -0500 Message-ID: <000001c6ea62$68863bc0$6e01a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C6EA38.7FB033C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C6EA38.7FB033C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable After I sent this inquiry, I found on the internet that the four wires should be heater power, heater ground, sensor ground, and sensor output. = I am not certain how to discover which is which with an ohm meter. My assumption is that the heater wires would ohm closed, and the sensor = ground might also be connected to these two, but probably not. Hi Bill, =20 Since you know it came off an RX-8, you could try asking on an RX-8 = forum. Someone on there would likely own the wiring diagram, which might give = wire colors. Of course this is assuming they're not all the same color :-) =20 If you can find a brand name, or any info on the sensor, you might find = it on internet that way as well, but I would bet you've tried this. =20 =20 Finally, I would go along with your assumptions for figuring out which = wire is which. I'd expect to see some resistance between the wires of the = heater as you suggested. I wouldn't be real surprised if both the heater and sensor ground were tied together at the housing. If so, both will ohm = as a short to the housing. The actual sensor wire should be able to be identified by heating the sensor with a torch to exhaust temps. =20 =20 My understanding is that these sensors will put off 0-1V for various O2 levels, but only when they're at normal operating temp. Once heated, = you could put a voltmeter on the various wires, and find two that give you a voltage reading. Orient the meter leads so that you get a positive = reading, and the wire that's on the red lead of the meter will be your sensor = wire. =20 =20 If you want to keep from burning your shop down, just buy a new single = wire sensor. They're cheap :-) =20 Cheers, Rusty =20 ------=_NextPart_000_0001_01C6EA38.7FB033C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

After I sent this inquiry, I found on the internet = that the four=20 wires should be heater power, heater ground, sensor ground, and sensor = output. I=20 am not certain how to discover which is which with an ohm meter.  = My=20 assumption is that the heater wires would ohm closed, and the sensor = ground=20 might also be connected to these two, but probably not.

Hi=20 Bill,
 
Since = you know it came=20 off an RX-8, you could try asking on an RX-8 forum.  Someone on = there would=20 likely own the wiring diagram, which might give wire colors.  Of = course=20 this is assuming they're not all the same color :-)
 
If you = can find a brand=20 name, or any info on the sensor, you might find it on internet that way = as well,=20 but I would bet you've tried this. 
 
Finally, = I would go=20 along with your assumptions for figuring out which wire is which.  = I'd=20 expect to see some resistance between the wires of the heater as you=20 suggested.  I wouldn't be real surprised if both the heater and = sensor=20 ground were tied together at the housing.  If so, both will ohm as = a short=20 to the housing.  The actual sensor wire should be able to be = identified by=20 heating the sensor with a torch to exhaust temps.  =
 
My = understanding is that=20 these sensors will put off 0-1V for various O2 levels, but only when = they're at=20 normal operating temp.  Once heated, you could put a voltmeter on = the=20 various wires, and find two that give you a voltage reading.  = Orient the=20 meter leads so that you get a positive reading, and the wire that's on = the red=20 lead of the meter will be your sensor wire. 
 
If you want to keep from burning = your shop=20 down, just buy a new single wire sensor.  They're cheap = :-)
 
Cheers,
Rusty
 
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