Leading Expert in Water Quality Online Analysis

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In more than 30 years LAR Process Analysers AG has established itself as world's leading manufacturer of high quality online water analyzers. The measurement systems are for the determination of sum parameters such as TOC, TP, TNb, TOD, COD, BOD and toxicity. LAR’s application-specific analyzers are used for the optimization of industrial and municipal waste water treatment plants, for environmental monitoring, as well as for process control in various industries.

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Industries & Applications

View on a chemical/ petrochemical plant


Based on their high precision, reliability and speed, LAR’s analyzers are used in various industries, e.g. petrochemical, pulp and paper, pharma, food/beverage and airports.

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Basin of an industrial wastewater treatment plant


From complex industrial waste water to pharmaceutical pure water, LAR offers the proper solution for any water analysis challenge (e.g. process water, boiler feed water, oil-in-water).

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View on an aeration tank of a wastewater treatment plant


LAR develops tailor-made analyzers that are versatile in meeting the demands of different applications and industries. Please find the right analyzer for your specific needs.

Explore our Analyzers

The total organic carbon (TOC) is one of the most important sum parameters in the assessment of the organic pollution of water. Since it includes all carbon compounds as one mass, it is exactly defined and an absolute quantity. Therefore, it may be determined directly.

Read more about TOC measurement methods.

LAR total organic carbon analyzers

The chemical oxygen demand (COD) indicates the amount of oxygen which is needed for the oxidation of all organic substances in water and is thus an important indicator for water analysis. It is considered in the planning and controlling of treatment, as well as assessing its efficiency, thus forming the basis for the calculation of waste water charges.

The COD can be determined in laboratory or online, whereby these methods significantly differ in duration and consumables used.

Read more about COD measurement methods.

LAR chemical oxygen demand analyzers

The biochemical oxygen demand (BOD) indicates the amount of oxygen which is needed for the biological degradation of organic substances in water.

Since the generally used BOD5 excludes the nitrification part of the process, this parameter is poorly suited for the control of waste water treatment plants. Alternatively, the total BOD is well-suited, due to the determination of the nitrogen as well as the carbonaceous part of biological degradation.

Read more about the online measurement of BOD.

Toxicity is described as the direct harmful effect of a substance on organisms. These effects can already occur at low concentraions of toxic substances and are dependent on the incubation period and the dosage.

Some test methods that are available on the market can detect toxicity by using fish, daphnia, molluscs, algae or luminous bacteria and testing whether a water sample has a toxic effect on the organisms. They do not, however, identify exactly which toxins are present.

Read more about online toxicity measurements.

Analyzer for BOD / toxicity measurements

The total nitrogen bound (TNb) shows the pollution of water caused by nitrogen compounds. Nitrogen may be present as ammonia, ammonium salts, nitrites, nitrates and organic nitrogen compounds.

In contrast to single measurements of the above-mentioned components, the TNb determination contains all these substances in a single analysis process.

Read more about online TNb measurements.

The total phosphorus (TP) is a sum parameter that shows the organic and inorganic phosphorus compounds in water. Phosphorus is an essential nutrient for humans as well as flora and fauna. However, the substance – depending on its concentration– may cause serious damage.

Read more about online TP measurements.

LAR TN TP analyzer


LAR Process Analysers AG celebrated its 30th anniversary on 22nd September 2016.



LAR's QuickTOCpurity is a tailor-made TOC analyzer (total organic carbon) for pure water and ultra pure water. The sample is injected via a special injection loop, avoiding any environmental influences to the sample.

parameter: TOC

types of water: pure water, process water, boiler feed water, condensate return


7 - 10 November 2016, Abu Dhabi, UAE


In November 2016 the Abu Dhabi International Petroleum Exhibition & Conference (ADIPEC) will be organized. It is the one of the world's most important oil and gas exhibition and conference.