OBS-3+

Name: OBS-3+
Brand: Campbell Scientific
SKU: 20809
Availability: Discontinued

Turbidity Sensor

OBS-3+

RetiredConfigurable

Turbidity Sensor

Lowest cost.

Pricing

Model:: OBS-3+
Item Number:: 20809
Warranty:: 1 year
Lead time:: 30 days

Overview

OBS-3+ TURBIDITY SENSOR

The OBS-3+ is a submersible turbidity probe that has sideways-facing optics. It uses OBS technology to measure suspended solids and turbidity for applications ranging from water quality in freshwater rivers and streams to sediment transport and dredge monitoring. Campbell Scientific data loggers measure the OBS-3+ probe's output and calculate turbidity.

Key Advantages

Accurate, Rugged
Compact, low-power probe is field-proven

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^® is a registered trademark of Campbell Scientific.

Benefits

Sideways facing optics avoid obstructions above and below the probe
Measures suspended solids and turbidity for up to 4000 NTUs
Provides a compact, low-power probe that is field proven
Compatible with most Campbell Scientific data loggers
Accurate and rugged
Stainless-steel body allows use down to 500 m in fresh water
Titanium body allows use down to 1500 m in fresh or salt water
Fitted with MCBH-5-FS, wet-pluggable connector—multiple mating cable length options available
Offers an optional five-point sedimentation calibration for better measurements (see Ordering Info on the web page)

Specifications

Range: 0 to 250 NTU
Range: 0 to 500 NTU
Range: 0 to 1000 NTU
Range: 0 to 3000 NTU
Range: 0 to 4000 NTU
Maximum Submersion Depth: 500 m
(1640.5 ft) for stainless-steel body
Maximum Submersion Depth: 1500 m
(4921.5 ft ) for titanium body
Concentration Accuracy: 2% of reading or 1 mg/l
(whichever is larger) for mud
Concentration Accuracy: 4% of reading or 10 mg/l
(whichever is larger) for sand
Maximum Concentration Range: Maximum concentration depends on sediment size, particle shape, and reflectivity.
Maximum Concentration Range: 5,000 to 10,000 mg/l
(for mud)
Maximum Concentration Range: 50,000 to 100,000 mg/l
(for sand)
Operating Temperature Range: 0° to 40°C
Drift over Time: < 2% per year
Maximum Data Rate: 10 Hz
Minimum Warm-up Time: 2 s
Infrared Wavelength: 850 nm ±5 nm
Daylight Rejection: -28 dB
(re: 48 mW/cm^-2)
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: 14.7 cm
(5.79 in.)
Weight: 181.4 g
(0.4 lb)