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Title: Controlling suspended samplers by programmable calculator and interface circuitry
Author: Eads, Rand E.; Boolootian, Mark R.
Source: Res. Note PSW-RN-376. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 8 p
Station ID: RN-PSW-376
Description: A programmable calculator connected to an interface circuit can control automatic samplers and record streamflow data. The circuit converts a voltage representing water stage to a digital signal. The sampling program logs streamflow data when there is a predefined deviation from a linear trend in the water elevation. The calculator estimates suspended sediment discharge from rating coefficients for the gauging site. When a threshold value of accumulated suspended sediment discharge is reached, the calculator sends a signal to the interface circuit that activates a pumping sampler. The sampling program is easily updated, and data are transferred to a computer by using a digital cassette recorder. This system increases sampling flexibility and efficiency.
Keywords: automatic pumping samplers, streamflow, suspended sediment, sampling, water quality, data logger, programmable calculator
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Eads, Rand E.; Boolootian, Mark R. 1985. Controlling suspended samplers by programmable calculator and interface circuitry. Res. Note PSW-RN-376. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 8 p.
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