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Lumex Instruments (0890278 B.C. Ltd.) Unit 207, 31510 Gill Ave., Mission, B.C., V4S0A1, Canada 31510 (0890278 B.C. Ltd.) Unit 207, 31510 Gill Ave., Mission, B.C., V4S0A1, Canada
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Analysis of recombinant protein purity and heterogeneity by capillary electrophoresis
CRAB - Optical detector of oil slicks

CRAB - Optical detector of oil slicks

Optical sensing of water surface with IR radiation

METHOD: Optical sensing of water surface with IR radiation.


is based on remote optical sensing of the water surface by a vertical divergent light beam. The difference between reflectances of oil products and water allows detection of the oil slicks.
The instrument consists of a sensor based on IR LEDs and single-channel optoelectronic receiving system. The measurement data are processed by a built-in microcontroller.

features and benefits

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 sensing: no sampling
  • High sensitivity: detection of oil slicks with  film thickness > 0.5 micron
  • Low interference from ripples: no effect from a change in the angle of optical axis with the wave surface up to ± 20o
  • Low interference from scattered radiation due to the light modulation
  • Customized  operation algorithm
  • Built-in processor for data acquisition and processing
  • Nonvolatile memory
  • Robust performance for outdoor installation

Ecological and sanitary monitoring

  • Ecological monitoring of water surfaces
  • Monitoring of industrial waste water
equipment and options
  • CRAB optical detector
  • Commutation device
  • Kit of spare parts and accessories

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


Analysis of a technological process and recommendations to choose proper analyzer configuration. Development of a scheme and design for installation of the analyzer (upon Customer's request). Our service engineers perform installation and commissioning of CRAB optical detectors at Customer's site. Consultations and initial training specific to the Customer needs are given to the personnel.

The information and specifications in this publication are subject to change without notice.

Sensitivity (minimal detectable oil slick thickness) 0.5 μm
Max. slope angle of the reflecting wave surface 20 °
Distance to the receiving system Up to 300 m
Distance to the water surface Up to 25 m
Communication ports RS485, RS232, current loop 4–20 mA
Signal status outputs Current signal, “No”, or “Yes” (“Alarm”)
Power requirements 187–242 VAC, 50 Hz; 15 VDC
Power consumption 20 W
Dimensions 160x160x110 mm
Weight 2 kg (55 lbs.)
Ambient temperature range -10 ºC up to +50 ºC
Ambient relative air humidity Up to 100%
Atmospheric pressure 84 to 106.7 kPa