SediTrans™ — turbidity, current, depth

The SediTrans is a turbidimeter designed specifically for sediment transport studies, and to measure all crucial parameters in each application. Our philosophy is, that instead of having one sensor for each parameter, we combine the important and useful sensors with a logger in a single instrument. This saves on overall cost in purchase, but more importantly, in operation and cost of analysis.

In this vein, the SediTrans turbidity instrument features all of the sensors that are in the SediMeter except the vertical array of optical backscatter detectors. This includes the accelerometer. When mounting the SediTrans suspended over the bottom with a float, it also functions as a tilt current meter (velocity sensor). Furthermore, we have added a magnetometer, which enables SediTrans to also measure the current direction (redundant in a river, but important in the sea).

The SediTrans can optionally be equipped with a pressure sensor to measure water depth. As a moored self-logging or cable-connected instrument, it measures turbidity (along with fluorescence), current velocity and direction, water level, tides, and wave conditions. It contains both an ISO (international) turbidimeter, and a U.S. style turbidimeter.

The SediTrans can also be used upside down, hanging from above with a weight. As a ship-based instrument, it can be towed to measure turbidity and depth at the same time. Since it contains an EPA style turbidimeter, it is thus intended to be useful for turbidity monitoring as presently required under U.S. law. If in the future the law is changed to allow for moored sensors to be used, as in many other countries, this instrument is already able to take on that role as well.

In combination with the Nilsson sediment sampler (aka the Swedish sampler) this turbidimeter can be used for the crucial calibration (i.e. to develop the correlation between sediment concentration in grams per liter and turbidity in FTU) by measuring the turbidity at exactly the same time as taking the water sample for analysis of sediment concentration in the lab.

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