Online water analysers for service water industry - Water and Wastewater - Water Utilities

Service water is water that must not have drinking water quality. It is mainly used in resource-intensive industries. Depending on the application, such as the commercial, industrial, agricultural or domestic use, the water must be treated according to the requirements.


Drinking water is an essential food for humans. Hence, the quality is internationally standardized and defined limits specify the water quality. In Germany, drinking water limits are defined in the drinking water ordinance (TrinkwV).

Often, surface water is prepared to drinking water in drinking water treatment plants. However, there is the possibility, that already contaminated water are feeded into the drinking water treatment plant. For this reason, the continuous monitoring of the influent is essential to ensure a good drinking water quality.

During the treatment process water is being disinfected. Accordingly, there is a risk that disinfection by-products (DBP) can be formed. The formation depends on the waters' chlorine and TOC concentration. Hence, the control of the disinfection dose is possible through TOC monitoring.

For a reliable monitoring of drinking and surface water LAR provides its online toximeter ToxAlarm. Furthermore, LAR's QuickTOCpurity and QuickTOCuv suits best for TOC monitoring in lowest ppb ranges.


Ground water is the accumulation of rainwater and leachate, that is accumulated in the soil. The use is regulated in the German Federal Water Act (WHG). In addition, ground water is protected by the European Water Framework Directive.

Ground water is an important source for drinking and service water. Therefore, the protection of ground water reservoirs is of great importance. The objective is to ensure water purity and to allow subsequent processing into drinking or service water. Especially in urban areas, the protection of these water represents a challenge.


Surface water is water, which is located above ground, such as rivers and lakes. Precipitation water that is not seeped, also belong to surface water.

Since nowadays the fresh water resources are limited, surface water is increasingly used in the industry. Most of the surface water are polluted by various substances such as algae, bacteria, organic matter and suspended solids. To use this water for further purposes, it must be pre-treated at first. A water treatment to drinking or service water is usually done by a clarification, sedimentation, sand filtration, activated carbon adsorption and disinfection.

For a reliable and safe use of treated surface water it is recommended - depending on the application - the online monitoring of the sum parameters TOC, COD, TP, TNb and toxicity.


Cooling water is used in almost any industry. It serves as heat transfer medium for the heat dissipation of buildings and processes. Generally, all cooling systems have one thing in common: The cooling medium is water.

There are several methods of cooling on the market, that may differ significantly referring to design and composition of the cooling medium. The most common methods at power plants and energy supplybusinesses - despite mixed and special forms - are the following: Once-through cooling or recirculative cooling, Open-circuit cooling and Closed-circuit cooling.

Often, cooling water is obtained from surface water. Depending on the application, the water must be treated before usage. However, cooling water becomes waste water when it is pre-treated by use of chemicals or changed in its composition by product spills or thickening. Therefore, the cooling water systems' effluent should continuously be monitored. To prevent contaminated influents, a continuously monitoring of TOC in the influent is advisable.

Important parameters for the assessment of cooling water are the TOC and toxicity. LAR AG provides with its Quick-series for each cooling water challenge an appropriate analyser. Furthermore, the ToxAlarm is optimally suited for the effluents' monitoring of toxicity.