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Calibration Stability and Response Time for Salinity Sensors¹

ABSTRACT

Commercially produced salinity sensors removed from field and lysimeter experiments lasting from 3 to 5 years were tested for calibration stability relative to the original factory calibration. Significant changes in calibration occurred in up to 14% of the sensors after 4 and 5 years of use. Response to a step-change in salinity was also examined for commercial units in a field installation. Calculated response factors were lower than those found in a previous laboratory experiment. However, response was sufficiently rapid to assure accurate readings if changes in salinity occur in time intervals exceeding 5 days.

¹ Contribution from the Agricultural Research Service, USDA, U.S. Salinity Laboratory, Riverside, Calif.

² Soil Scientist, U.S. Salinity Laboratory, 4500 Glenwood Drive, Riverside, CA 92501.

Received for publication July 15, 1977. Accepted for publication October 18, 1977.