What is the pressure range that the sender operates over?  If it is a 0-30
psi sender, then what you got is correct.

Bill B
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Wednesday, April 27, 2011 9:12 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Bad pressure sender?

I'm not sure that I'm doing this right.  I don't want to buy, and then
crowd my panel with, separate gauges for oil temp and pressure, so I've
decided to wire them into my MegaSquirt.  The upside is that will enable
me to log them.  To do this, I need resistance curves for the sensors.

The temp was no problem.  Measure it at room temp, after it has been in
some ice water for a while, and then boil it for a while.

The pressure sender, I finally settled on just connecting it to my air
compressor while varying the pressure.  At ambient, I got an open
circuit.  Opened the regulator up to 30psi, and I got 39 ohms.  Then it
stayed at 39 ohms, all the way up to 100psi.

I don't think this is the way the pressure regulator is supposed to
work, but I'm willing to be corrected if I'm wrong.  Should I just order
a pressure sender?

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