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Campbell Scientific Acquires OBS Line From D&A Instruments

The OBS-3A turbidity recorder is one of the instruments in the line Campbell Scientific acquired.

The OBS-3A turbidity recorder is one of the instruments in the line Campbell Scientific acquired.

Campbell Scientific, Inc., of Logan, Utah, has purchased the OBS product line from D&A Instrument Company.

John Downing, owner of D&A, disbanded the company after the sale and has semi-retired.

Campbell Scientific Inc. has more than 34 years of experience in data acquisition and control products. The company previously sold the OBS-3 and OBS-3+ sensors, which monitor turbidity and suspended-sediment concentrations using optical backscatter (OBS) technology.

OBS production and business operations have been moved to company headquarters in Logan, Utah, and Campbell Scientific is now responsible for all warranty repairs, quotes, orders, and any other business regarding D&A Instrument products.

The OBS technology works by emitting a near-infrared light into the water, then measuring the light that bounces back from the suspended particles. Campbell Scientific has begun production of the OBS-3+ probe, and the OBS-3A and OBS-5+ water-quality systems. These later two systems provide data logging capability, store up to 200,000 lines of data, and include PC software for system setup and data retrieval. Each OBS-3A has a turbidity sensor and a temperature sensor. A pressure transducer for depth measurement and a conductivity probe are available as options. The system can perform wave processing of the depth measurements using a fast Fourier transform (FFT) algorithm for wave height and period. The OBS-5+ monitors high suspended sediment concentrations and depth. Its unique optical design consists of one emitter and two detectors. This design allows the OBS-5+ to sense suspended sediment concentrations for up to 50 g/l in mud or 200 g/l in sand. A pressure transducer is included for depth measurements.

Campbell Scientific announced in a press release that they will carry on the tradition of high-quality craftsmanship that D&A established, and will will continue to seek product advancements, at times consulting with John Downing. The company web site is campbellsci.com/obs

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