Mailing List flyrotary@lancaironline.net Message #19384
From: David Staten <Dastaten@earthlink.net>
Subject: Re: [FlyRotary] Re: Source of oil fittings.. and CCI compatibility... Bypass block dimensions..
Date: Thu, 24 Mar 2005 09:36:05 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


Russell Duffy wrote:
Message
I noticed that you are using the stock oil pressure sender (or appear to). Did you have to purge/fill the portion of the block's tubing with oil to get it to read properly? Is it sending to an EM2 or a separate gauge?

Hi Dave,
 
I'm using the stock pressure location, but the sender is a VDO part, as recommended by Tracy for the EM-2.  There is a standard American to silly metric adapter on the end of it.   There's no special purging or filling requirements for any pressure sender that I know of.  Pressure is pressure, so it wouldn't matter if there was air in the sender or oil.  
 
Cheers,
Rusty (off to measure the panel for a Raven, and pick up my G-38)

I was basing my question about the purge bit based on my healthcare experience... In the ICU and some OR settings catheters/lines are directly placed into arteries, brain spaces, large veins and pressure readings are transduced in order to manage treatment. Air in the lines affects the readings.. but then I realized the air affects the CHANGES of pulsatile flow.. it dampens it... like the pressure wave with your heartbeat. In a constant-pressure situation (or at least "non-pulsatile" pressures.. in which the character of the pressure waveforms dont matter) I guess you are right.. pressure is pressure.. and the reason we are measuring it shouldnt matter on the presence or absense of air.
 
Dave
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