OBS501 Smart Turbidity Meter with ClearSensor
®
Technology
6
5.3 ClearSensor
®
Antifouling Method
The OBS501 incorporates the ClearSensor
®
(U.S. Patent 8429952) anti-fouling
method to prevent biofouling, which ensures better measurements in
biologically active waters. This method uses a shutter/wiper mechanism to
protect and clean the optics (see FIGURE
). Additionally, biocide, stored in
a refillable chamber, continuously leaches over the optics while the shutter is in
the closed position.
FIGURE 5-1. OBS501 sensor with the shutter open (top) and
closed (bottom)
5.4 Comparison of OBS500 and OBS501
The OBS501 provides the same functionality as the OBS500 but performs
better in heavy sediment load environments. This was accomplished by using a
shutter and body design that eliminates parallel surfaces between moving parts
(wherever possible), which prevents sand grains or packed sediment from
getting wedged between the shutter and the sensor body. The OBS501 also
uses a flushing action that moves the sediment down and out of the cavity
behind the shutter.
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. Users who are particularly concerned about the
sediment load can use SDI-12 instructions to place the shutter in the normally
open mode.
6. Specifications
Features:
•
Designed to perform better in heavy sediment load environments
•
Dual backscatter and sidescatter sensors used to measure turbidity
•
ClearSensor
®
antifouling method for better measurements in
biologically active water
•
Disposable plastic sleeve facilitates cleanup
•
Optional copper sleeve for additional protection (especially for sea
water) or disposable plastic sleeve facilitates easy cleanup
•
Compatible with Campbell Scientific CRBasic dataloggers: CR6,
CR200(X) series, CR800 series, CR1000, CR3000, and CR5000
