OBS-3 Sensor

OBS-3 Sensor


 

OBS-3 Sensor

 

The OBS-3 sensor from D & A Instrument Company measures suspended solids and turbidity with a patented (U.S. Patent No. 4,841,157) backscatter method.
It features: nearly linear response to particle concentrations spanning more than three orders of magnitude, an with infrared measurement system; an optical filter with synchronous detection to reject ambient light; a small package; and low power consumption.

 

*** Calibration of the OBS is undertaken in house with a small recirculating tank, a matlab programme has been developed to enable the group to easily evaluate and plot the data obtained from any RUNTI or SLOT deployment within a matter of minutes on site
Application
River and stream gaging
Add-on sensor for CTDs, data loggers, & current meters
Wastewater and effluent measurements
Monitor dredging & mining operations
Permit compliance
Control instrumentation for settling ponds
Sediment transport research
Laboratory measurements

 

FEATURES
Measures sediment concentrations to 5000 mg/l & turbidity to 4000 NTU
Log pressure, temperature, and salinity
Records 7000 scans of data with programmable sampling scheme
Compact package - 75 mm (3") by 422 mm (16.6")
Depth limit - 300 m

 

RANGE / ACCURACY
Turbidity
0 to 250 NTU
0 to 500 NTU
0 to 1000 NTU
0 to 2000 NTU or 0 to 4000 NTU
0-100 +/- 0.1 NTU
100 - 500 +/- 1.0 NTU
500 - 40002 +/- 5.0 NTU

 

Concentration 1 / Concentration 2
Mud 0 to 5000 mg/l
Sand 0 to 50 g/l
Mud +/- 0.1 mg/l
Sand +/- 0.1 g/l
1 Ranges depend on sediment type. 2 With 2nd-order polynomial equation

 

OTHER DATA
Maximum data rate
Infrared wavelength
Maximum depth
Drift
Power
10 Hz
875 nm
500 m
> 5% / year
9 - 16 Vd.c. / 14 mA