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Date: Mon, 23 Apr 2001 10:46:18 -0700
From: Patrick Duffy <pduffyca@ea*.ne*>
To: Ian Puleston <ian@un*.co*>
CC: techdiver@aquanaut.com, Quest List <quest@gu*.co*>
Subject: Re: O2 analyser sensitivity mod
Ian,

The sensitivity that you speak of is likely a result of the potentiometer in
the design that you are using.

I assume you are using a non-linear (radio) pot.  If so, it is very slow on
one side and extremely fast on the other.

You need to replace it with a linear pot and an appropriate resistor.  A 100
ohm pot with a single 360 ohm or 390 ohm resistor will provide a nice, slow
movement.  A 500 ohm pot with (I think a 220 ohm) will result in a larger
range with the trade off being just a tad more sensitive.  Both work
exceptionally well.

Patrick
--
OxyCheq ... your source for oxygen sensors
http://oxycheq.com

Ian Puleston wrote:

> Recently someone posted details of a mod to a home made O2 analyser to
> reduce the adjustment sensitivity, but I can't find that posting now, so
> could someone point me at it please. Thanks.
>
> Ian
>
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