Purpose: To measure NaOH concentration in water on-line with the ClearView ® db ? lter photometer and a ? ber optic ? ow cell in a slip stream. Background: Water is an intense absorber in the NIR, requiring small opti- cal paths to make useful measurements. These small paths may plug or entrain bubbles. The spectral signals in aqueous systems also change considerably with temperature. Guided Wave has selected one wavelength at 1290 nm fo

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