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

-----Original Message-----
From: Phil Culpovich <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 19 August 1998 14:30
Subject: Re: [TN] cupric chloride etcher controllers


>Rudy:
>
>Since our company is the "one vendor" that makes the colorimetric
controller of which you speak, I find it odd that being the "most commonly
used
>controller in the PCB industry", you state that, "From what I have seen,
this system is reasonably reliable, but does not conrol as tightly, in
widely
>varying process circumstances." If this were actually the case, the
majority that use our controller are either unintelligent or know something
that you
>don't. To anyone that is interested in using our system, we ALWAYS insist
that they don't take our word for it but rather contact our customers and
ask any
>questions they want before making a purchase.
>
>My apologies to any that read this message believing it to be advertising
as it is not. It is only a response to a direct mis-statement about my
product.
>
>Phil Culpovich
>

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