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
> ------------------------------
>
> Date: Tue, 18 Aug 1998 20:42:01 EDT
> From: "<Rudy Sedlak>" <[log in to unmask]>
> Subject: Re: cupric chloride etcher controllers
>
> Gerard:
>
> Presume that you realize that there are three controllers on a Cupric etcher,
> or should be, Baume', which controls water input, ORP, which controls the
> oxidizer, usually Chlorate, or Peroxide, and Conductivity, which controls HCl.
> And these three operate independently of each other.
>
> This means that a given controller set could work smashingly on one control,
> and poorly on another. Further, given that many of the people putting
> together controller sets do not make all the various different controls
> themselves, and can change vendors on a given controller, you got a lot of
> variables.
>
> One vendor makes the most commonly used controller in the PCB industry, and
> this controller is the only one that is different from the pack, as they use
> colorimetry. From what I have seen, this system is reasonably reliable, but
> does not conrol as tightly, in widely varying process circumstances.
>
> Good luck
>
> Rudy Sedlak
> RD Chemical Company
>
> ------------------------------
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