The patented sensor measures a vertical turbidity profile through the water / sediment interface, and estimates the level of the bottom with sub-millimeter resolution. The current generation, SM4, features nephelometric turbidimeters (calibrated in NTU and FNU), fluorescence meters, accelerometer, conditions-based monitoring, and UV anti-fouling.
The SediTrans contains the same nephelometric turbidimeter section as SediMeter SM4 (in fact, all the sensors minus the OBS array), but to this is added a magnetometer and a pressure sensor. By mounting this instrument with a float it becomes a combination turbidimeter + tilt current meter + tide level sensor + wave parameter sensor. It can also be used with a weight from a boat as a turbidimeter streamer with integral depth sensor. New for 2019, see our Blog for release video.
To convert the turbidity data to suspended sediment concentration (SSC) one must take a sample of the latter. The Nilsson sampler is a light-weight (11 kg) sampler that nonetheless is useful in up to 200 cm/s stream velocity.
The SediLink is a radio modem using XBee® modules for communication to a shore station. The transparent dome contains the radio, the antenna, a solar panel, and 4 white LEDs that blink during communication. It is designed to be mounted on top of a 2″ rod buoy that can be deployed even by small crafts.