Laser scanning Oil Film Detector LO-300

Laser scanning Oil Film Detector

Oil film detector LO-200 scans water surface with the laser and detects the film of oil.Because the oil is more reflective than the water, the intensity of light reflected from the oil will be greater than that from water surface.The LO-200 detects floating oil by sensing the difference in the intensity of reflection.
As compared with spotlight-based systems, The LO-200 adopted laser scanning method enables to operate more reliable against water surface level fluctuation, and widen distance between the water surface and the detector.


Division: Water Pollution
Manufacturing Company: HORIBA Advanced Techno Co., Ltd.


  • Usable with large water level fluctuation
    The laser scanning will detect oil on water surfaces between 30 cm and 3 m from the detector, enabling use where there are surface waves or water level fluctuations.

  • Avoiding false alarms
    False alarms due to waves or reflective floating matter can be avoided by adjusting the continuous detection time.

  • Resistance to interference from ambient light
    Modulated light and a band-pass optical filter are used to eliminate interference from sunlight and other ambient.

  • Flexible application
    In addition to detection of a film of oil or other liquid on water surfaces, the unit may be used for detection of oil, water, or other liquid on dry surfaces.

  • Easy to maintain
    No adjustment necessary when the scanner unit is replaced.

  • Easy to install
    The optical module is emplaced on a free-hanging assembly so that it corrects itself the optical axis to true vertical and does not require realignment if the unit shifts after installation.



Model numberLO-200
Subject of detectionOil on water surface or liquid on floor
Detection methodsurface scanning laser / reflected light sensor
Laser emitter

Semiconductor laser,wavelength (λ) 650 nm, output within 1 mW (class2)

Mdulation laser frequencyApprox. 50 kHz
Scanning  mechanizmOscillating mirror

Detection range
(refrractive index of scanned media)

Model 11.00 (no reflection) to 1.58
Model 21.33 (water) to 1.58
Leak detectionDetection cycle1 sec. (fixed)
Continuous detection time (N)1 - 99 sec. (adjustable at 1 sec. intervals)
Leak detection alertEngages when current from light sensor exceeds threshold setting for N consecutive seconds.
ErrorMalfunctionEngage when laser emission, laser scanning, or motor rotation fails
Abnormal light sensingEngage when floating debris produces no reflection or abnormally strong reflection.
OutputRelay signal outputs (leak detected and error)

Dry contact relay, form A and B; max.
load is 4 A at 250 V AC or 30 V DC.

Current outputIntensity of light picked up by the sensor is converted to a 0 - 20 mA current signal.
Adjustments and displaysLight sensing levelDisplayed with 17-LED bar indicating 0 - 20 mA
Leak detection current thresholdDisplayed with 17-LED bar indicating 0 - 20 mA; adjusted by potentiometer dial
Continuous detection timeAdjusted with two rotary switches, one for 10 sec. increments and one for 1 sec. increments
Operating lamps

Green LED (RUN) indicates operation
Yellow LED (ERR) indicates error, red
LED (ALM) indicates leak detected.

Power supplyAC 100 V ± 10 %  50 or 60 Hz signal-phase, 100 VA max. 27 w (typ.)

Operating temperature

-10 to +50 ℃ (if water surface not frozen)
WeatherabilityWater-tight construction for outdoor use
Materials / surface treatmentsCylindrical shroudAlumite-treat aluminum, polyurethane finish
Display boxAlumite-treat aluminum, polyurethane finish
Finish colorJapan Paint Manufacturers Association U35-85B
External dimentions

185 mm Φ × 535 mm H

WeightApprox. 14 kg
Attached cables12 m, 1.25 mm sq., 3-wire power cable
12 m, 0.5 mm sq., 6-wire shield sheath signal cable
Installation condeitions

Maximum 3 ° off true vertical
Use shade where necessary to avoid direct sunlight
Prevent freezing of scanned water surface
Use rain hood where necessary
Max. 3 m between detector and scanned surface

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