Please post your response on-line, as well.

On Wed, 19 Aug 1998, Phil Culpovich wrote:

> 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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