Trübungsmesser / OBS-5+
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OBS-5+ System zur Messung von hohen Sedimentkonzentrationen mit Drucksensor
Genau und robust
für hohe Sedimentkonzentrationen
wetter wasser energie gas flux & turbulence bauwerke boden


Der OBS-5+ bestimmt hohe Sedimentkonzentrationen über einen Infrarot-Laser und ein duales Lichtdetektorsystem (U.S. Patent No. 5,796,481). Über eine RS232- oder RS485-Schnittstelle überträgt der Sensor Sedimentkonzentration und Tiefe auf einen PC. Die Daten werden außerdem intern gespeichert. 

Der OBS-5+ ist ideal zur Überwachung von Ausbaggerungen und Geländesanierungen, zur Erforschung von Sedimenttransport oder zur Unterstützung von Grabungen und Bergbau unter Wasser.

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Funktionen und Vorteile

  • Kann direkt mit dem PC verbunden werden – Datenlogger ist nicht notwendig
  • Läuft bis zu 6 Monate mit 3 C-Zell-Batterien
  • Misst hohe Schwebstoffkonzentrationen (bis zu 200g/l)
  • Speichert 200 000 Datensätze im Flashspeicher des OBS-5+


Technische Beschreibung

The OBS-5+ has a Windows GUI that enables the user to generate and store sediment calibration tables, log data, program logging/sampling schemes, and graphically display data. Using the Windows GUI, an operator can calibrate the OBS-5+ with sediments, change electronics gain to optimize resolution, create as many as 15 unique sediment lookup tables, and store those tables in FLASH memory for future use. Users can complete the entire calibration process without spreadsheet calculations and curve fitting.

Advantage of Multiple Detectors

Unlike single-detector systems such as the OBS-3+, which cannot measure suspended solids concentration (SSC) levels greater than about 10 g l-1 (mud) and 100 g l-1 (sand), the OBS-5+ uses multiple detectors. With these detectors and an embedded controller, the OBS-5+ extends the measurement range of the sensor by a factor of about ten. 

The OBS-5+ projects a beam of near infrared (NIR) laser light into a water sample next to two photodetectors. Suspended particles scatter light from the beam onto the detectors and a microcontroller determines SSC from their photocurrents. Because the detectors are unequally spaced from the laser, the particle concentrations corresponding to the peak response are also unequal and after being calibrated with sediment, an OBS-5+ can measure and uniquely resolve sediment SSC values greater than the peaks in response.

The OBS-5+ has been used extensively to monitor dredging and mining operations in the US, EU, China, Vietnam, and Indonesia.


John Downing. 1998. Suspended Particle Concentration Monitor. U.S. Patent Number 5,796,481.

(OBS® is a registered trademark of Campbell Scientific.)


Connector MCBH-8-FS, wet-pluggable
Wetted Materials 316 stainless steel, Delrin, and 20% GF polycarbonate
Operating Temperature Range 0° to 40°C
Storage Temperature Range -20° to +70°C
Infrared Wavelength 780 nm
Scattering Angles 105° to 165° (clean water)
Drift over Time < 30 ppm per month
Drift over Temperature < 200 ppm per °C
Maximum Sampling Rate 25 Hz
Maximum Data Rate 2 Hz
Data Capacity 8 MB
Maximum Number of Data Lines 200,000
Battery Capacity 8 Ahr
Maximum Battery Life 3,000 h
External Supply Voltage 6 to 18 Vdc
External Supply Current 55 mA
PC Interfaces RS-232/115 kbps, RS-485/115 kbps
Diameter 6.0 cm (2.4 in.)
Length 38.0 cm (15 in.)
Weight 2.04 kg (4.5 lb)
Submerged Weight 1.02 kg (2.3 lb)


Sediment Concentration
  • 2% of reading (for mud)
  • 4% of reading (for sand)
Pressure 0.5% of full scale
Turbidity 1.5% of full scale

Kompatibel mit

Field Cables

Campbell Scientific offers a choice of field cables used to connect the OBS-5+ to a PC for system configuration. The cables differ in their length (see Ordering Info).


OBS-5+ Utility v.5.50 (11.3 MB) 23-04-2010

Utility for the OBS-5+ sensor.