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September 2000

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Subject:
From:
Ted Stern <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 29 Sep 2000 18:16:58 -0500
Content-Type:
text/plain
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text/plain (80 lines)
Dear Rudy:

Aside from the specific gravity (Baume'), I believe the parameters proffered for an
ORP/Conductivity/SG controlled cupric system, regardless of the oxidizer employed
(chlorine gas, hydrogen peroxide, or sodium chlorate) were sufficiently wide to apply
all systems (excluding PCMI applications). Forgive me regarding the Baume' range, as I
have become accustomed to working with sodium chlorate regenerated systems.  This range
would not be inclusive of chlorine gas and hydrogen peroxide regenerated cupric
systems.  However, sodium chlorate systems do indeed operate at good effeciency within
29 - 31 Baume' range with ORP control.

In reading your response, I feel you may have presumed I was advocating a particular
method of control.  Though it is likely we have opposing viewpoints, I belive the
recommendation to take the time to process sample panels at users employing different
technologies is valid.

Regards,
Ted Stern
877-272-1272


"" wrote:

> In a message dated 9/29/00 8:07:15 AM Pacific Daylight Time,
> [log in to unmask] writes:
>
> << In terms of cupric chloride
>  bath chemistry, a comparison of the operating parameters between ORP and
> turbidimetric
>  methods of control is as follows:
>
>             Method of Control                ORP                Turbidimetric
>
>                   Cu (total), g/L             150-180                  210-235
>                     HCl, N                        1 - 3
> 0.02-0.04
>                     Baume'                      29 - 31
> 38-40
>   >>
>
> WRONG WRONG AND WRONG!
> You can control the etchant to ANY READING in a ORP/acid/Baume' type
> controller.  That is the beauty of that sort of system, versus the
> turbidimetric system, the turbidimetric system defines what your readings
> MUST be, whereas the other system allows you to choose what YOU want.
>
> It is the replenisher  chemistry that really affects what Baume' you can run,
> with Chlorate limiting you to lower levels of Copper, than Hydrogen Peroxide.
>
> Rudy Sedlak
> RD Chemical Company
>
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