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Date: Mon, 20 Dec 2010 08:52:37 -0500
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Subject: Re: [LML] Revised Fuel Probe Calibration Map (after Six Years)
From: Colyn Case <colyncase@earthlink.net>
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that kind of looks like the probe sagged in the middle.
the ends are pretty close.

On Dec 19, 2010, at 7:09 PM, Jeffrey Liegner, MD wrote:

> Lancair ListServ,
>=20
> FWIW:  In my Lancair IVP, I have VMS fuel capacitance probes (AC =
output) which interface with Pricnceton Electronics Interface units (AC =
in, DC out) which communicates with my Chelton's EAU (originally made by =
GRT).
> =20
> I recently re-calibrated my fuel probes output through the Princeton =
interface unit, as I wondered about calibration drift after six+ years.  =
Each tank holds 55 gallons, and the step-reading system is based on 10% =
increments.
>=20
> <P67201407_1.png>
>=20
> As you can see, the output reading has changed over time, resulting in =
a display error in fuel volume in the tank.  This explains the =
calculated Totalizer mismatch (and WARNING message) with the probe's =
Fuel Quantity reading, as occassionally seen on long flights.  An =
example is when there was actually 44 gallons in the tank (ex, after =
using 11 gallons per fuel flow sensor), the older fuel map told me there =
was 38.5 gallons...you can understand the Totalizer error created by =
this.
>=20
> I simply post this in case others find it relevant or interesting.
>=20
> Jeff L in New Jersey
> LIVP
>=20
>=20