The OBS500 is a submersible turbidity probe with active antifouling capabilities for better measurements in biologically active water with both high and low turbidity. It outputs an SDI-12, digitally processed signal that many of our dataloggers can measure. ClearSensor® and OBS® are registered trademarks of Campbell Scientific.Read More
Design features of the OBS500 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.
To prevent biofouling and ensure better measurements, the OBS500 incorporates the 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 shutter is in the closed position.
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.
(OBS® is a registered trademark of Campbell Scientific.)
|Dual Probe||90° sidescatter and backscatter|
|Range||0 to 4000 NTU|
|Active and Passive Antifouling||Shutter, wiper, biocide, copper, optional removable sleeve|
|Concentration Accuracy||±2% of reading or 0.5 NTU (whichever is greater)|
|Operating Temperature Range||0° to 40°C|
|Emitter Wavelength||850 nm|
|Power Requirements||9.6 to 18 Vdc|
|Measurement Time||< 10 s|
|Maximum Submersion Depth||100 m (330 ft)|
|Diameter||4.8 cm (1.88 in.)|
|Maximum Cable Length||> 500 m (1640 ft)|
|Length||27 cm (10.63 in.)|
|Weight||0.59 kg (1.3 lb)|
|Quiescent||< 200 µA|
|Measurement||< 40 mA|
|Communication||< 40 mA|
|Maximum Peak Current||200 mA for 50 ms when shutter motor starts|
|Active Shutter Motor||< 120 mA|
|SDI-12||Version 1.3, 1200 bps|
|Analog||0 to 5 Vdc|
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.