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D & A INSTRUMENT COMPANY is the well known manufacturer of "OBS" turbidity meters, working on the optical backscattter principle. These sensors are measuring in situ the turbidity and amount of sediment up to very high concentration levels. OBS backscatter sensors in combination with LISST-25 forward scattering turbiditymeters of Sequoia which are used to calibrate, are the perfect combination to measure very precisely the the turbidity and sediment concentration. The amount of water samples to take for calibration is therefore reduced to an absolute minimum, what results in a substantial gain of time during measurement campaigns and processing of results. With the combination of OBS and LISST-25 is therefore possible to carry out reliable measurements under any meteorological conditions, even when the taking of water samples would be difficult or even impossible. Following OBS-sensors are offering you the right performances for your application:
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 Download specification OBS-3 as pdf-file |
The OBS-3 sensor measures suspended solids and turbidity with a patented
(U.S. Patent No. 4,841,157) backscatter method. It features: nearly
linear response to particle concentrations spanning more than three
orders of magnitude, an with infrared measurement system; an optical
filter with synchronous detection to reject ambient light; a small
package; and low power consumption. Applications:
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Download specification OBS-3A as pdf-file |
The OBS-3A
sensor combines
field-proven optical backscatter sensor for
measuring suspended solids and turbidity (U.S. Patent No. 4,841,157)
with pressure, temperature, and conductivity sensors in one recording
instrument. An OBS-3A can log one scan of data per hour for nine months
on lithium batteries. Easy-to- use, software that runs in Windows® is
provided with the instrument. Applications:
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The OBS-5 system monitors high particle concentrations using an infrared laser and two detectors controlled by a microprocessor (U.S. Patent 5,796,481). It is uniquely suited for monitoring dredging operations and flood events when very high sediment loads are expected. The probe transmits sediment concentration, turbidity, depth, temperature, and salinity to a PC where data are displayed and recorded in Windows®. Applications include:
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River
and stream gaging
