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APHA Color On-Line Monitoring with a ClearView™ Photometer

From Guided Wave, Inc.
 

 

To determine APHA color on-line for process control or in the lab for product release. Aproach: An Optical Solutions' PS-2-UV/VIS diode array spectrophotometer and HeaterCell™ fiber optic accessory were used to measure the visible spectra of the Pt-Co, APHA color standard in the range from 0 to 500 at room temperature in a 1 cm cuvette.

Results: The resulting spectra are shown at top right. The Pt-Co standard has a peak near 455 nm. The calibration for these data is shown at middle right. The 300 APHA sample was analyzed three times with excellent reproduciblity. ClearView™ has a long-term stability of about 1 mAU. This means that in a 1 cm fiber optic probe or cuvette, the precision of the measurement is ±3.5 APHA, or about 0.7% fullscale Usually a 2 cm probe is used for measurements in the 50- 500 range with a precision of ±1.8 APHA.

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