GENEQ > Environment > Suspended Solids

Field-proven monitor of suspended solids and turbidity
Model OBS-3A

  
FEATURES
  • No cable required, runs 1,500–8,000 hours on 3 “D” cells
  • Measures sediment concentrations to 5,000 mg/l & turbidity to 4,000 NTU with field-proven OBS® technology (U.S. Patent No. 4,841,157)
  • Logs depth, wave height, wave period, temperature, and salinity
  • Records 200,000 lines of data in FLASH
  • Compact package — 76 mm (3") by 362 mm (14.3")
  • Program setpoints & sampling times
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    APPLICATIONS
  • Record turbidity at remote sites
  • Monitor dredging & mining operations
  • Wastewater effluent measurements
  • Sediment transport research
  • River and stream gauging
  • Permit compliance
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    DESCRIPTION
    The OBS-3A combines our OBS probe with pressure, temperature, and conductivity sensors in a batterypowered recording instrument. The monitor is operated with software running under Windows® 98, 2000, and XP.
    NEW OPERATIONS
    Users can program sampling schedules with a PC. When surveying, data are displayed in real time as they are recorded. During autonomous operation, the unit records data in FLASH which can be post-processed and graphically displayed with EXCEL or LOTUS.

    RANGE
    Turbidity 0 to 4000 NTU
    Concentration* Mud:0 to 5000 mg/l
    Sand: 0 to 50 g/l
    Pressure 0–200 dBar**
    Temperature 0–400 C
    Conductivity 0–65 mS/cm
    * Ranges depend on sediment type.
    ** 1 dBar is equivalent to about 1 meter of water.

    ACCURACY
    Turbidity 0-100 0.5 NTU
      100 - 500 2.0 NTU
      500 - 4000 10 NTU
    Concentration Mud 0.5 mg/l
      Sand 0.5 g/l
    Pressure 0.2% of f.s.*  
    Temperature 0.050 C  
    Conductivity 0.07 mS/cm  
    * f.s. = 50, 100, or 200 dBar

    OTHER DATA
    PC interfaces RS-232 / 115 kbps
    RS-485 / 115 kbps
    USB
    Maximum data rate 25 Hz
    Infrared wavelength 875 nm
    Maximum depth 300 m
    Drift < 2% / year
    Connector MCBH-7-FS,
    wet-pluggable