[Gasification] Oxygen sensors for gasifier engines

[Manuel Escamilla]

Dear Tom

You should consider using electro valves that use current instead of voltage 
as control sign. The reason is that electrical current is less susceptible 
to interference (multi source) than voltage signals, thus more reliable. The 
price is almost the same and I have used them not only for exhaust control 
for engines that drive generators but also for many other applications. If 
you want top of the line try german manufacture. Those guys are the best. If 
you want cheap, good, and somewhat reliable go for taiwan or chine 
manufacture. I was trying to remember the name of the company that sells 
them in the US but I don't have it right now. I'll search through my papers 
tomorrow and see if there is something there.

Hope this helps

Regards

Manuel A. Escamilla



>Message: 4
>Date: Sun, 29 Oct 2006 06:53:24 -0700
>From: Thomas Reed <tombreed at comcast.net>
>Subject: [Gasification] Oxygen sensors for gasifier engines
>To: Art Krenzel <phoenix98604 at msn.com>
>Cc: andy schofield <scothebuilder at hotmail.com>,
>	gasification at listserv.repp.org,	"STOVES at LISTSERV.REPP.ORG"
>	<STOVES at LISTSERV.REPP.ORG>
>Message-ID: <4544B254.5030209 at comcast.net>
>Content-Type: text/plain; charset=ISO-8859-15; format=flowed
>
>  Dear Art, Andy and All:
>
>We are developing small scale gasification power systems for biomass and
>use the 4 wire oxygen sensors to regulate air fuel ratio at the engine.
>The 4 wire sensor is heated so that the output voltage won't vary with
>exhaust temperature.  It gives a good signal, depending on air/fuel
>ratio, 0-200 mV for lean, 400-1000 for rich.
>
>In the feedback loop one needs a gas valve that can be controlled from
>this signal.  We have built one, but does anyone know of a simple
>inexpensive available valve for this?
>
>Thank,
>
>TOM REED       BEF
>------------------------------------------------------------------------

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