OBS-3A
Turbidity and Temperature Monitoring System
The OBS-3A combines our OBS® probe with pressure, temperature, and conductivity sensors in a battery-powered recording instrument. Batteries and electronics are contained in a housing capable of operating at depths of up to 300 meters, depending on which pressure sensor is installed.
The heart of the OBS-3A monitoring system is an optical backscatter sensor for measuring turbidity and suspended solids concentrations. This sensor detects near infrared (NIR) radiation scattered from suspended particles.
A fast-response, stainless-steel-clad thermistor monitors temperature. Pressure is measured with a semiconductor piezoresistive strain gage, and conductivity is measured with a four-electrode conduction-type cell. Working depths of the pressure sensor is selected as an option.
The monitor is operated with software running under Windows 98, 2000, and XP.
Features
- No cable required, runs 1500–8000 hours on 3 D-cell batteries
- Measures sediment concentrations to 5000 mg/l and turbidity to 4000 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 memory
- Program setpoints and sampling times
Specifications
Compact package—76 mm (3 in) by 362 mm (14.3 in)
