X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 09 May 2007 11:26:55 -0400 Message-ID: X-Original-Return-Path: Received: from jrcda.com ([69.36.178.59] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2033473 for lml@lancaironline.net; Wed, 09 May 2007 02:54:08 -0400 Received-SPF: none receiver=logan.com; client-ip=69.36.178.59; envelope-from=hwasti@starband.net Received: from [192.168.1.101] (cbl-238-61.conceptcable.com [207.170.238.61] (may be forged)) (authenticated bits=0) by jrcda.com (8.12.11.20060308/8.12.11) with ESMTP id l496rDDe022891 for ; Wed, 9 May 2007 00:53:14 -0600 X-Original-Message-ID: <46416FD0.60003@starband.net> X-Original-Date: Tue, 08 May 2007 23:53:04 -0700 From: "Hamid A. Wasti" User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] IVPT fuel system References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Wally Bestgen wrote:

Ultimately the only change I have to the system is to add a current fault detector that measures the resistance of the vent solenoid. In the event the solenoid fails and the resistance drops to "0" an annunciator light is illuminunated.

The the "0 resistance" detector is a fuse/breaker. The resistance falling to 0 is a lot less likely than the resistance going to infinity (open circuit). I suspect that is what your new device is actually detecting.

However, in the best case, such a system only detects that the coil still has the right resistance and is being energized. It does not detect the position of the plunger or the state of the vent opening, both of which can be different than expected due to a number of potential failures. Be careful that you do not get lulled into a false sense of security with such a system -- all it is detecting is the state of the coil, NOT the state of the vent.

Regards,

Hamid