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

SediMeter™ model SM3B


This is the same instrument as the SM3A, but with a built-in cleaner intended to keep the sensor free from biofouling. A motor in the top drives a cleaner shuttle hanging in a thin but strong line outside the instrument. The motor house is made of copper-nickel, an alloy with very low corrosion and excellent natural anti-fouling characteristics. Approximately 50 cleanings can be made on one battery charge. The cleaning interval is set as a multiple of the measurement interval. Another difference is that it has the connector in the lower end instead of in the upper end.

This model may be considered where biofouling is a significant problem, but where suspended sand is not abundant in the water column. In most cases the SM3A with copper tape on the rear side of the sensor provides adequate fouling protection, and in the remaining case the SM4 series may be considered instead.

Features in common for all SM3 models of 2017:

The sensor consists of 36 near infrared optical backscatter detectors (NIR OBS) spaced 1 cm apart. The active measurement length is 35 cm. Turbidity is measured at 71 levels, every second one as straight backscatter and avery second one as oblique backscatter, and reported in formazin turbidity units (FTU) with no decimals. The level is estimated with 0.01 mm resolution.

There is an identical optical backscatter detector located 11 cm above the others. It is used to measure straight backscatter turbidity as a separate variable. The instrument also reports temperature and battery level at each measurement.

Burst samples of up to 20 samples of turbidity and level can be taken in each measurement, with a time interval of 1 s to 16 s between the burst samples. This allows for detecting differences during a wave period, for instance. The time interval between measurements is from 3 seconds to 24 hours.

The SediMeter has a built-in memory that holds 16,384 measurements. It can also be used in real-time monitoring, alone or in a network. When used in stand-alone mode it is powered by a built-in battery that is recharged through the same USB cable used to set up the instrument and to download data.

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).

Trifold Flyer pdf | Specifications pdf | Kit pdf | Comparison with SM4 | Reviews

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