Kemtrak Fluorescence (Oil-in-Water) Analyzers

Kemtrak Photometer LCD displayGlobal environmental concerns have imposed restrictions on the amounts of oil that can be released into the environment from both oil and gas facilities/installations and industrial plants where oil is used as part of a process or manufacturing methods (i.e. power plants, large machine shops). There are a variety of trace oil-in-water analyzers available on the market using either fluorescence or a scattered light turbidity technique.


Water, when contaminated with non-soluble hydrocarbons will become visually turbid or “cloudy”. This turbidity can be measured and is directly proportional to the concentration of these non-soluble contaminants present. This technique works well for any non-soluble oil contamination in clean water but results can be greatly affected by entrained gas and solids present in the stream.


Oil rich in polyaromatic hydrocarbons (PAH) will fluoresce when illuminated with ultraviolet light. Typical oils that fluoresce include fuel oil, crude oil, hydraulic oil and transformer oil. Each oil type has its own unique fluorescence intensity resulting from its specific PAH content. The combined fluorescence from both dissolved and non-soluble oil-in-water can be measured and correlated to oil content. Entrained gas and solids present in the stream do not fluoresce and therefore do not affect the measurement.


Unlike most units, The Kemtrak FL007 analyzer uniquely utilizes both fluorescence and turbidity measurement using proprietary dual wavelength ratio measurement techniques for continuous monitoring of trace oil and hydrocarbon contamination in water. This dual technique makes the measurement more reliable to provide high confidence in the reported results while providing operators with a deeper insight into the amount of oil being discharged into the environment in real-time.


Automatic compensation for color and optical window fouling prevents measurement drift and built-in advanced diagnostic functions provide a measurement quality indication and prompt for when maintenance such as cell cleaning is recommended to ensure trouble free operation.

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Measuring Principle


The Kemtrak FL007 is a combined fluorescence photometer and ratio turbidimeter. The Kemtrak FL007 uses a dual wavelength ratio measurement technology that simultaneously measures fluorescence and turbidity (scattered light) at 90° and transmitted light.

Fluorescence occurs when a substance absorbs light at one wavelength then re-emits the light at longer wavelength.

Flourescence emmision graph 1

Common naturally occurring fluorescent compounds are polycyclic aromatic hydrocarbons (PAHs), the most abundant of the main hydrocarbons present in crude oil and petroleum products. PAHs are excited using ultraviolet (UV) radiation and will fluoresce in the UV-visible wavelength range as shown in the diagram below. The fluorescent properties of an oil are dependent upon a number of factors, such as its composition, the proportion of aromatics present and the oils carbon structure.


Flourescence emmisions graph 2