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Oil slicks optical detector CRAB price

Oil slicks optical detector CRAB

Oil slicks optical detector Lumex Instruments 77
Oil slicks detector CRAB - by
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CRAB - optical sensor of the water surface oil slicks

CRAB is an easy-to-operate, active oil slicks optical detector. The instrument detects the presence of oil using optical sensing with a vertical laser beam and measuring the differences in the reflection properties of water and oil products.

The optimized optical scheme, signal processing routine, and modulation of the light beam intensity provide a drastic decrease of the influence of the wind waves and background illumination on the measurement results.


Remote optical sensing of water surface with vertical laser beam.


Is based on the difference in light reflection from water and oil film surface.

features and benefits
  • Continuous remote optical sensing, no sampling
  • High sensitivity: detection of oil slicks with thickness down to 0.5 micron
  • No interference from scattered radiation
  • Low interference from ripples and waves (beam/surface angle up to ±20°)
  • Built-in data acquisition and processing
  • Waterproof housing for outdoor installation
  • Ex-proof option is available
  • Mounting at stationary points, buoys, motor boats
  • Long-term operation without maintenance
  • Monitoring of water surfaces (sea, harbors, lakes, rivers)
  • Oil leakage detection
  • Monitoring of process and waste waters
equipment and options
  • Oil slicks optical detector CRAB
  • Power supply unit for AC 110–240 V power mains (optional)

CRAB optical detectors are covered by a 12-month warranty.


Our engineers develop a scheme and design for the detectors installation upon customer's request and provide consultations and training.

Detecting object Oil slick on water surface
Min detectable oil film thickness 0.5 μm
Mode of measurement Continuous
Min response time 0.1 s
Signal status outputs “No”, “Yes” (“Alarm”)
Communication ports RS-485
Current loop 4–20 mA
Twisted pair length up to 1500 m
Power supply 100–240 V, 50–60 Hz
Power consumption up to 3 W
Ambient conditions Temperature: -10 to +50 ºC
Humidity: up to 100% (rain)
Distance to the water surface 0.5–20 m
Dimensions 120х180х120 mm
Weight up to 1.5 kg