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| Oregon Water Science Center |
Field Comparison of Optical and Clark Cell Dissolved Oxygen Sensors in the Tualatin River, Oregon, 2005 |
By Matthew W. Johnston and John S. Williams |
Open-File Report 2006-1047 |
| ONLINE ONLY (download the report) |
AbstractComparison of two Clark cell type dissolved oxygen sensors with three optical sensors in the Tualatin River, Oregon, indicated that the optical sensors were less prone to fouling drift and calibration drift. In two cleanings and calibrations over the 3-week study, the Clark cells had fouling drifts ranging from 0.17 to 0.37 mg/L and calibration drifts ranging from –0.22 to 0.03 mg/L. The optical sensors had fouling drifts ranging from 0 to 0.02 mg/L and calibration drifts ranging from –0.09 to 0.02 mg/L after 2–3 weeks of deployment. Measurements by the Clark cell and optical sensors compared well to each other and to point measurements of oxygen concentration using the Winkler method, indicating that the optical sensors were as accurate as the Clark cell sensors under the study conditions. |
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Download the report (PDF, 0.3 MB) (Adobe Reader® required; version 5 or higher preferred. If you do not have the Adobe PDF Reader, it is available for free download from Adobe Systems Incorporated.) Document Accessibility: Adobe Systems Incorporated has information about PDFs and the visually impaired, and provides tools to help make PDF files accessible. These tools convert Adobe PDF documents into HTML or ASCII text, which then can be read by screen-reading programs that synthesize text as audible speech. In addition, a version of Adobe Reader that contains support for screen readers is available. The conversion tools and the accessible reader may be obtained free from Adobe through their conversion tools Web site. For information about the Tualatin River Water Quality Study, please visit the study Web site. To learn more about USGS activities in Oregon, please visit our home page.
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