Paul:

Please see my response to you off-line as this is not an appropriate
place for this particular discussion.

Phil

Date:    Wed, 19 Aug 1998 18:31:34 +0100
From:    Paul Gould <[log in to unmask]>
Subject: Re: cupric chloride etcher controllers

Phil,

I think you are being unfair. In my opinion what Rudy said is as close
to
an
endorsement as you could expect and he is factually correct, or do you
maintain that your system will control the three parameters as
accurately
as
three independent controllers do?

I guess we are really talking about HCl and Oxidiser because you
probably
add water by SG control anyway. In my experience you have to add them in

varying amounts depending on the type of work processed and no system
which
controls both from one parameter can be as effective. If your system
adds
both in a fixed ratio then it will be more variable than using
Conductivity
and ORP controllers to add them separately as required.

This is not to say that yours is not a good system, it clearly is, but
you
have to recognise the limitations.

Paul Gould
Teknacron Circuits Ltd

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