OBS-3A Turbidity and Temperature Monitoring System

The OBS-3A combines the OBS probe with pressure, temperature, and conductivity sensors in a battery-powered recording instrument.

Features

  • No cable required, runs 1,500-8,000 hours on 3 D-cells
  • Measures sediment concentrations to 5,000 mg/ι & 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


Applications

  • Record turbidity at remote sites
  • Monitor dredging & mining operations
  • Wastewater effluent measurements
  • Control water clarity in settling ponds
  • Sediment transport research
  • River and stream gauging
  • Permit compliance


Specifications

  • Ranges
    • Turbidity: 0-4,000 NTU
    • Concentration: Mud -5,000 mg/l; Sand 0-50 g/l (depends on sediment type)
    • Pressure: 0-200 dBar (200 m)
    • Temperature: 0-40° C
    • Conductivity: 0-65 mS/cm
  • Accuracy
    • Turbidity: 0.5 NTU or 1% of reading 2
    • Concentration: Mud 1.0 mg/l or 1% of reading; Sand 0.5 g/l or 1% of reading (whichever is larger)
    • Pressure: 0.2% of f.s. (f.s. = 50, 100 or 200 dBar)
    • Temperature: 0.05° C
    • Conductivity: 0.1 mS/cm
  • Other Data
    • PC interfaces: RS-232 / 115 kbps; RS-485 / 115 kbps; USB
    • Maximum data rate: 2 Hz
    • Infrared wavelength: 875 nm
    • Maximum depth: 300 m
    • Drift: < 2% / year
    • Day-light rejection: -28 dB (re: 48 mW cm-1)

 

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OBS-3A Brochure


File Size 735KB   Filename b_obs3a.pdf   Download