"Campbell Scientific OBS 3A turbidity temperature logger series"@en . "A combined optical backscatter and temperature logger that monitors turbidity and suspended sediment concentrations. A pressure transducer for depth measurement and a conductivity probe are available as options. This sensor detects near infrared (NIR) radiation (875 nm) scattered from suspended particles. A fast-response, stainless steel-clad thermistor monitors temperature. Pressure is measured with a semiconductor piezoresistive strain gauge, and conductivity is measured with a four-electrode conduction-type cell. The system can perform wave processing of the depth measurements using a fast Fourier transform (FFT) algorithm for wave height and period. The pressure transducer is selected from a range between 0 - 200 m. The sensor has a maximum submersion depth of 300 m. Turbidity accuracy: <+/-2%. Sediment concentration accuracy: +/-2% of reading (for mud), +/-3.5% of reading (for sand). Pressure accuracy: +/-0.5% of full scale. Temperature accuracy: +/-0.5 deg C. Conductivity accuracy: +/-1%."@en . "SDN:L22::TOOL1476" . "SDN:L22::TOOL1476" . . "accepted"@en . . . . "2020-06-02 15:19:19.0" . "false" . "1" . . "2020-06-02 15:19:19.0" . . . "1" . . "Campbell OBS-3A" . "Campbell OBS-3A"@en . . . "SDN:L22::TOOL1476" . .