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The third generation SediMeter™ was designed in 2013 as a no-frills, mission-focused instrument, featuring both internal data logging and the capacity to act as a sensor in a monitoring network. It has 36 NIR backscatter detectors 1 cm apart, plus a 37th OBS detector 11 cm above number 36. The SM3 allows burst sampling of the bottom level and the 37th OBS, with up to 20 samples taken at an interval of 1 to 16 seconds. This is useful for determining the repeatability and autocorrelation of the measurements. The time interval between measurements is from 3 seconds to 24 hours.
As in SM4, the sensor measures both direct backscatter (180 degrees) and oblique scatter (about 90 degrees). This helps discerning if the reflection comes from the sensor surface, from turbid water, or if the sensor is above water. The instrument also reports temperature and battery voltage at each measurement.
The instrument can be mounted in sediment using the standard anchor and holder tube included if purchasing a kit. This holder is screwed down in mud and sand with the help of a handle.
The instrument is available separately or as a kit in a convenient case, complete with all necessary accessories for stand-alone use in the field (handle, anchor, holder tube, cable, blind plug).