The OBS500 combines a backscatter sensor (better at measuring high turbidity) with a second sidescatter sensor (better at measuring lower turbidity). This SDI-12 probe uses digital processing.

The OBS500 incorporates the ClearSensor Antifouling Method (patent pending) to ensure the accuracy of its measurements. The ClearSensor method uses a shutter/wiper mechanism to protect and clean the optics. This antifouling method also includes a chamber filled with a biocide that continuously leaches out over the optics while the probe is in the closed position.

The OBS500 includes a disposable plastic sleeve that can make clean up a snap, as well as an optional copper sleeve that can provide additional protection, especially in sea water.

Features

Dual backscatter and sidescatter sensors used to measure turbidity
ClearSensor (patent pending) Antifouling Method providing better measurements in biologically-active water
Shutter/wiper mechanism
Refillable biocide chamber for preventing fouling
Disposable plastic sleeve that facilitates clean up
Optional copper sleeve for additional protection, especially in sea water.
SDI-12 and 5V outputs
 

Technical Specifications

Dual Probe: backscatter and 90° side scatter
Range: 0 to 4000 NTU
Active & Passive Antifouling: shutter, wiper, biocide, copper, optional removable sleeve
Accuracy: ±2% of reading or 0.5 NTU (which ever is greater)
Temperature Range: 0° to 40°C
Temperature Accuracy: ±0.3°C
Emitter Wavelength: 850 nm
Power Requirements: 9.6 to 18 Vdc
Power Consumption
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
Measurement Time: <10 s
Outputs: SDI-12 (version 1.3) 1200 bps;RS-232 9600 bps;Analog 0 to 5 Vdc
Max. Submersion Depth: 100 m (330 ft)
Dimensions
Diameter: 4.8 cm (1.88 in.)
Length: 27 cm (10.63 in.)
Weight: 0.59 kg (1.30 lb)
Maximum Cable Length: > 500 m (1640 ft)