Benefits and Features

Dual backscatter and sidescatter sensors used to measure turbidity

ClearSensor antifouling method for better measurements in biologically active water

Shutter/wiper mechanism keeps lenses clean

Refillable biocide chamber prevents fouling

Disposable plastic sleeve facilitates cleanup

Optional copper sleeve for additional protection (especially for sea water) or disposable plastic sleeve facilitates easy cleanup

Technical Description

Design features of the OBS501 include the combination of a backscatter sensor (better at measuring higher turbidity) with a second sidescatter sensor (better at measuring lower turbidity). It has a shutter that is opened only during measurements, which reduces the time that algae or other organisms can cling to its optics.

The OBS501 is constructed to prevent sand grains or packed sediment from getting wedged between the shutter and sensor body, which inhibits the shutter's movement. To do this, the OBS501's shutter and body were designed to eliminate parallel surfaces between moving parts wherever possibleT.he probe also uses a flushing action that moves the sediment down and out of the cavity behind the shutter.

To prevent biofouling and ensure better measurementst,he OBS501 incorporatetshe ClearSensor Method (U.S. Patent No. 8,429,952. This method uses a shutter/wiper mechanism to protect and clean the optics. With the ClearSensor method, a chamber is also filled with a biocide that continuously leaches out over the optics while the probe shutteris in the closed position. ClearSensoran’d OBS” are registered trademarks of Campbell Scientific.

The OBS501 can sense if the shutter's motor is working harder than normal. If it is, the shutter moves slightly back and forth to dislodge sand grains before fully opening or closing.

Campbell Scientific offers a disposable, plastic sleeve that can make cleanup a snap, as well as a copper sleeve that can provide additional protection, especially in sea water.