Measurement and Control Products for WEATHER Measurement and Control Products for WATER Measurement and Control Products for ENERGY Measurement and Control Products for MACHINES Measurement and Control Products for STRUCTURES Measurement and Control Products for EARTH
Accurate, Rugged
Compact, low-power probe is field-proven
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Technical Description

The OBS-3+ uses its sideways-facing optics to emit a near-infrared light into the water. It then measures the light that bounces back from the water’s suspended particles.

If an obstruction is in the emitted light’s range, the light will scatter back and the turbidity reading will be too high. This probe's sideways-facing optics avoids obstructions above and below the probe. The OBS300 is available for locations that have obstructions around the sides of the probe.

OBS-3+ Specifications

  • CE Compliant
  • Drift: less than 2% per year
  • Maximum Data Rate: 10 Hz
  • Infrared Wavelength: 850 nm ±5 nm
  • Daylight Rejection: -28 dB (re:48 mW/cm²)
  • Optical power: 2000 µW
  • Turbidity Accuracy: 2% of reading or
    0.5 NTU (whichever is larger)
  • Housing material: 316 stainless steel or titanium
  • Connector: MCBH-5-FS, wet-pluggable
  • Diameter: 2.5 cm (0.98 in.)
  • Height: 14.1 cm (5.56 in.)
  • Weight: 181.4 g (0.4 lb)

Maximum Depth

  • Stainless-Steel Body:
    500 m (1640.5 ft)
  • Titanium Body:
    1500 m (4921.5 ft )

Maximum Concentration Range

  • Mud: 5,000 mg/l to 10,000 mg/l
  • Sand: 50,000 mg/l to 100,000 mg/l

Concentration Accuracy

  • Mud: 2% of reading or
    1 mg/l (whichever is larger)
  • Sand: 4% of reading or
    10 mg/l (whichever is larger)

-2.5 Output Option

  • Output Voltage:
    0 to 2.5 V over selected NTU range
  • Supply Voltage: 5 to 15 Vdc
  • Current Drain: 15 mA

-5 Output Option

  • Output Voltage:
    0 to 5 V over selected NTU range
  • Supply Voltage: 5 to 15 Vdc
  • Current Drain: 15 mA

-20 Output Option

  • Output Voltage:
    4 to 20 mA over selected NTU range
  • Supply Voltage: 9 to 15 Vdc
  • Current Drain: 45 mA