Oil Detectors – Wastewater

Autonomous non-contact sensor for detection of oil on wastewater. Highly accurate, easy to maintain, finds oil spills and leaks early so you can respond faster.


Oil spills entering the drains can seriously jeopardize the operation of wastewater treatment plants. In this case it is crucial to detect the leak early and prevent the oil reaching the aeration tanks, for example. LDIs ROW oil on water detector ensures rapid and safe detection and allows suitable shut off at the inlet. The sensors are non-contact which reduces the risk of sensor fouling or false alarms. They are available in both Ex and safe area versions.

With the ROW’s optical technology for non-contact monitoring, there is no marine biofouling or oil contaminating the sensor. This limits the need for regular cleaning.

Row Detects

  • Motor oils
  • Turbine oils
  • Vegetable oils
  • Fuel oils
  • Marine diesel oils
  • Crude oils
  • Heating oils
  • Lube oils
  • Hydraulic oils
  • Gas oils
  • Motor oils
  • Mineral oils


Aluminium ROW

Stainless Steel Ex d  ROW Version

24/7 Operation Even in Harsh Environments
Available in anodised aluminium, 316 stainless steel and EXd enclosures for even the toughest applications.

Long Life, Low Maintenance

Robust IP68 certified hermetic design and 5 year LED lifetime. Low power consumption of < 2W with optional remote operation using solar panels battery.

Non-Contact Detection Instrument
Easier installation, no water contamination and no maintenance.

Wastewater Sewer Application

A municipal sewer monitoring for environmental oil leaks from neighbouring industrial plants who discharge wastewater in the local drainage.

Wastewater Sewer Application

Manufacturing effluent discharge into water body. An early warning system for potential leaks.

Sewer wastewater application

Protecting wastewater pumping station and treatment plant from oils and diesels spills.

The Science

To detect oil slicks as thin as a single micron from up to 10m above the water, the ROW pulses a UV beam at the surface and excites any oil molecules in the target area. Using oil’s native fluorescence, ROW is calibrated to identify the specific wavelength signal of oil and send out an alert.

After 20 years of developing remote-sensing systems, LDI has mastered the technology better than anyone else.

Industry-leading Sensitivity – 1µm

Advanced software algorithms are calibrated to detect oil down to single-micron layers and minimise false alarms.


Service and Maintenance

Two versions available.

Light Fraction Standard Configuration
Model O-4500B O-2301B
Oils detected Light to Medium fractions Medium to heavy fractions
Kerosene, gasoline, jet fuel, diesel etc Crude, bunker fuel, fuel oils, diesel
Range 2m 8m