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|4th Generation SediMeter with turbidimeters, accelerometer, and UV LEDs|
|SediMeter SM4||Apart from the same OBS array as in the previous SediMeters, the fourth generation also have ISO-style and EPA-style turbidimeters for estimating the concentration of suspended sediment. The sensor diameter is 15 mm over the OBS array, and 20 mm over the turbidimeters. This means that the turbidimeters are located above the holder tube when deployed. The window in front of the turbidimeters is protected from fouling by two UV LEDs. A vibrator helps shake off bubbles, especially useful for calibration. The 3D accelerometer gathers data for measuring inclination (data integrity), for analyzing vibration (indicating strong currents of waves), and finally, to trigger extra measurements in case of strong shaking such as provoked by a turbidity current, or an earthquake. The AA rechargeable battery is in a separate compartment and can be replaced by qualified personnel.|
|3rd Generation SediMeter|
|SediMeter SM3||Reports the through-the-bottom turbidity profile with 5 mm resolution over 35 cm, using a combination of straight and oblique backscatter. Also reports backscatter turbidity 11 cm higher up, temperature, and the estimated bed level with 0.01 mm resolution. It can be used both for stand-alone logging, and for real-time monitoring. This is the workhorse, and perfectly adecuate for many applications where no cleaner is necessary. The SM3 model replaces the previous base model SM3A. SM3 has an AA battery instead of the AAA battery in SM3A, and the battery is located in a separate compartment, thus making it replaceable by qualified personnel.|
|Telemetry By license-free radio, or cellular phone|
|SediLink||The SediLink radio modem links one or more SediMeters to a PC running the SediMeter software, using a low-power XBee« radio. The maximal range depends on country-specific regulations on frequency and effect. Also available with buoy. Consider this option when you cannot run a cable, or the distance is too large. XBee radios can also forward the message from SediLink to SediLink, thus extending the total range of the measurement system. For customers in the U.S. we can also offer a cellular phone option. Contact us for a quote.|
|Suspended Sediment Sampler a.k.a. Nilsson sampler, Uppsala sampler, and Swedish sampler|
|Sampler||The Nilsson suspended sediment sampler is a standard in many countries. In spite of being light enough to carry in a backpack in the field, it is able to take samples in up to 2 m/s of stream velocity. It uses a 1 liter plastic bottle and a brass tube set. After drying and weighing the sample the suspended sediment concentration (SSC) in the water can be calculated. By taking a number of SSC measurements, and developing a regression function with the turbidity measurements of SediMeter SM4, it is possible to convert the turbidity data into sediment concentration data. The sediment transport can then be calculated by multiplying the SSC in kg per cubic meter, with the discharge in cubic meters per second.||
Carrier and intake nozzle set sold separately.
Specifications subject to change. Reservation for typos and other errors in the presentation. XBee is a trademark of Digi International, Inc.