OIW Analyzer QuickOIL

LAR's QuickOIL is the ultimate online analyzer for the determination of oil, fat, and grease in water.

Oil-in-Water Analysis

Features & Benefits

  • Exact determination of Oil-in-Water (OIW)
  • Measurement Range: 0.1-100 mg/l, 2-400 mg/l, 5-2,000 mg/l, 100-15,000 mg/l, 100-50,000 mg/l, further options available
  • Proven thermal oxidation principle
  • Highest combustion temperature available (1,200°C)
  • Catalyst-free
  • Response Time: 3 minutes
  • Multi-stream measurements (optional)
  • No filtration necessary
  • High salt concentrations possible, up to 30% NaCl
  • No memory effects
  • Very low maintenance and operational costs
OIW-Analyzer QuickOIL

LAR's oil-in-water analyzer is suitable for a variety of applications and types of water:

Using analyzer options, the measurement system is adaptable for every measurement challenge.

  • FlowSampler
  • Multi-stream measurement for up to 6 sample streams
  • Combination with TOC, COD and TNb detection

For safe operation in hazardous areas, there are different protection housings available:

  • IP54 (Standard)
  • NEMA 4X
  • ATEX Zone I
  • ATEX Zone II
  • IECEx

Fast online Oil-in-Water monitoring. For every kind of oil, fat and grease.

Oils and fats - of animal, vegetable or mineral origin - are the main components for a variety of products such as fuels, edible oils or fuel oils. In production processes it is quite possible that some of the oils or fats leak into the process and waste water. A large part of the costs, caused by an oil leakage and attempts to purify the contaminated water, can be saved by the use of appropriate online OIW-analyzers (oil-in-water).

LAR's QuickOIL is the ultimate online analyzer for the determination of oil, fat, and grease in water.

What is oil actually?

There is no clear answer to this question because oil is not a chemical substance. Oil is a collective term for viscous, sticky and fatty hydrocarbon substances. Oils and fats are extracted from raw materials, such as seeds and animals fats. Mineral oils are processed in oil refineries, where tons of steam and hot water are being used. Their purity is of big concern and requires fast and reliable analysis methods.

Basically, oil is hydrophobic and thus it cannot be mixed up with water. Oil can be present as free oil, as an oil sheen and / or as tiny droplets. But at an increased temperature, in turbulent conditions and when some process solvents are leaked into the water, oil can be dissolved or gets emulsified. As the water temperature slowly drops, the emulsified oil starts to separate, thickens, hardens and solidifies. Oil becomes fat. The typical solidification temperature range depends on the type of oil, e.g. palm oil at 31 to 41°C. As a consequence, a layer of fat is built up in process pipes and/or sewer systems, restricting the water flow.

It is extremely difficult to clean oily and fatty waste water. Whilst free oil rises to the water surface where it can easily be skimmed, the emulsified and dissolved oil flows untreated through the oil and fat separator.

Common OIW methods and their limits.

Most online oil-in-water analysis methods are based on an indirect measurement and are only suitable for a certain type of oil (fluorescence) respective oil droplets (scattered light principle) or dissolved oils (spectroscopy).

It becomes really challenging when the oil-in-water composition varies frequently over time and when it contains a mix of different unknown types of oils. As a result, these waste waters cannot be determined by common indirect measurements.

Moreover, due to the multitude of wetted parts used, many OIW methods are not suitable for online measurements, as these parts require a huge amount of cleaning and maintenance.

The alternative: A carbon counter.

A TOC analyzer directly determines all hydrocarbons in water, hence all kind of oils and fats - independently of their origin, composition or consistency. Generally, in most applications the amount of carbons that is not part of oil or grease groups, is negligible.

LAR‘s solution: QuickOIL.

For the determination of higher concentrations, many online analyzers have to dillute the sample with demineralized water. Due to the hydrophobic characteristics of oil, dillution techniques are not applicable.

Furthermore, oils and fats cause absorption and adsoprtion on wetted parts leading to carry-over and memory effects. This increases the response time resulting in a slower recovery after a peak contamination.

LAR’s QuickOIL does not need any dilution or pretreatment of the sample. There are only three wetted parts in the analyzer that are in contact with the sample - and these parts are flushed with clean water after every measurement. The entire oxidation power of the QuickOIL ranges up to 50,000 mg/l. Thus, LAR‘s ultra high temperature combustion at 1,200°C is way ahead of common thermal oxidation methods.


The TOC is one of the most important composite parameters in the assessment of the organic pollution of water.

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Related News for QuickOIL

LAR's QuickOIL is an online OIW analyzer for the determination of oil-in-water (OIW). The analyzer determines all types of oils and fats – regardless of whether they are of animal, vegetable, mineral or synthetic origin.


The determination of oil-in-water (OIW) is of special importance in many processes of the chemical and petrochemical industry. Since oils and fats consist of carbon compounds, TOC analyzers (total organic carbon) are particularly suitable for their reliable detection. LAR's QuickOIL is an online analyzer for the determination of oil-in-water.


LAR's QuickOIL is an online analyser for the determination of oil in water (OIW). Since oils and fats consist of carbon compounds, TOC analysis (total organic carbon) is particularly suitable for their reliable detection.