Oil In Water

The Advantage
  • A reliable and low maintenance measuring system of UV fluorescence achieves this goal
  • Automated mechanical wiper is available for Surface cleaning & air bubble Removal(Optional)
  • Robust & Water proof (IP68) Digital sensor: Modbus RS - 485
  • Factory pre-calibration for easy set up and field calibration for more accuracy
  • Fully compatible with PC software ViewTM for easy setup and data logging

BAS-SMART OW7 is a new generation of immersion sensors for measurement of oil or hydrocarbons in water based on the UV fluorescence principle. When excited by a light beam at a specific wavelenght, some compounds re-emit light at a longer wavelength. Since there are very.

limited number of chemicals such as PAH that have fluorescence signatures, this method gives a highly selective measurement with much higher sensitivity than the conventionally used infrared based technology. This makes it possible to determine even the slightest traces of PAH's.

Application Areas

  • Industrial Wastewater
  • Municipal & Sewage Wastewate
  • Sea Water
  • Surface Water Monitoring
  • Sanitation Network
  • Oil in Water Technology
  • Drinking Water
Oil in Water Technology

UV fluorescence is a sensitive method of detecting aromatic hydrocarbon compounds in water. Fluorescence is generally defined as a phenomenon in which a part of the radiation absorbed by a compound of interest at a certain wavelength is radiated out at a longer wavelength. Certain compounds, including aromatic hydrocarbons, absorb energy when the water is excited by light of a specific wavelength usually in the UV range. This absorbed light energy is radiated out again at a higher wavelength and the amount of this radiated energy is proportional to the concentration of the light absorbing compound. Each compound has a specific wavelength range for absorbing and re-emitting this radiation. This allows specificity for the compound in question to be detected by measuring the fluorescent light at prescribed wavelengths.

In addition to PAHS, the BAS-SMART OW7 is also recommended for detection of monocyclic aromatic hydrocarbons (e.g., benzene, toluene, xylene; also referred to as BTX). As with all BAS-SMART sensors, the BAS-SMART OW7 sensor is delivered pre-calibrated, so that the sensor is ready to be used.


Measuring Principle Light Source: Xenon flash lamp + filter(254nm) Detector: Photo diode + filter (360nm)
Light Source Fluorescence
Measuring Range 0 to 50 ppb, 500 ppb, 0 to 5 ppm, 50 ppm, 150 ppm
Accuracy 3%
Response Time T90 < 10s
Measuring Interval 5s
Operate Pressure 3 bar, 1 bar in Flow cell 2 to 4 L/min
Operate Temp. 32 to 104 "F (0 to 40 "C)
Power 24 VDC, Max. 30W
Interface RS485 Modbus RTU
Output 4 to 20 mA
Housing Material: 316L, titanium is optional;>IP68 Submersible
Dimension Dia. 2" (50.8 mm), Length 9" (229 mm)
Weight 6 lbs (2.8 kg) with 30" Cable
CE Marking EN 61326-1:2013 Electromagnetic Compatibility EMC
Standard Warranty

Standard warranty is 12 months from the date of commissioning & limited to maximum of 15 months from the date of shipment of the analyzer system

Sales & Service Support
  • Factory Acceptance Test (FAT)
  • Site Acceptance Test (SAT)
  • Site Commissioning
  • After Sales Service Backup
  • Guaranteed spares parts availability for maximum 10 years of instrument life.
Ordering information
OW7 -X1 -X2


-1: 0-500 ppb
-2: 0-150 ppm
-3. Custom range (Maximum 150 ppm)

-C10: 10 ft. Cable
-C20: 20 ft. Cable
-C30: 30 ft. Cable
Please contact factory for other cable length