Lindorm, Inc.
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"Sedimeter sensors designed and
built by Lindorm are a fantastic
tool for measuring water column
turbidity and siltation." (Gravity)

Contact us for price and availability.

4th Generation SediMeters with turbidimeters, accelerometer, and UV LEDs Mechanical Cleaner Vibrator UV LED
SediMeter SM4A SM4 This is the base model of the 4th generation. 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. This model has an AAA battery. - Y Y
SediMeter SM4B SM4 This model is identical to SM4A but has about 3 times more battery capacity, which translates into longer deployment times. - Y Y
SediMeter SM4C SM4 This version has about 6 times more power available than SM4A which means better protection against fouling in front of the turbidimeters, and longer effective deployment times. - Y Y
3rd Generation SediMeters Mechanical Cleaner Vibrator UV LED
SediMeter SM3A SM3A Our base model SediMeter. 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. - - -
SediMeter SM3B SediMeter SM3B This SediMeter has a mechanical sensor cleaner that wipes the sensor at user-set intervals. To power the cleaner it has a much larger battery than the SM3A. Y - -
Telemetry By license-free radio, or cellular phone
SediLink SediLink radio modem SediLink mounted on a buoy 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 Nilsson 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.

Specifications subject to change. Reservation for typos and other errors in the presentation. XBee is a trademark of Digi International, Inc.

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