The OBS-3+ Turbidity Monitor is a submersible probe, part of our OBS® line of products that use a backscatter method to measure turbidity. The OBS-3+ operates in the range of 0 to 4000 NTU. It replaces the OBS3 on our price lists.
The OBS-3+ can be used in several applications, ranging from water quality in freshwater rivers and streams to sediment transport and dredge monitoring. The output for the OBS-3+ can be specified at time of order, allowing you to customize the sensor to match the datalogger being used to make the measurement.
Features
Each OBS-3+ has two channels—one
channel measures the lower turbidity range and the other channel
measures the higher turbidity range.
-2.5
Supports our CR200-series, CR510, or CR10(X) dataloggers. Both channels have an output range of 0 to 2.5 V.
-5
Supports our CR800, CR850, CR1000, CR3000, CR5000, and
CR9000(X) dataloggers. Both channels have an output range of 0 to 5 V.
-20
One channel has an output range of 4-20 mA, and the
other channel has an output range of 0 to 5 V. A CURS100 is required
for our dataloggers to read the 4-20 mA output.
Specifications
- Accuracy of turbidity: 2% of reading or 5 NTUs (whichever is greater)
- Drift: less than 2% per year
- Input voltage: 5 to 15 Vdc (voltage); 9 to 15 Vdc (4-20 mA)
- Maximum depth: 500 m with stainless-steel body; 1500 m with titanium body
- Infrared wavelength: 850 nm ±5 nm
- Length: 141 mm (5.56")
- Outer Diameter: 25 mm (0.98")
- Weight: 0.4 lb (181.4 g)
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