Online Analyser

Seibold Wasser COMPOSER Analyser can perform continuous analysis of heavy metals in water.

The colorimetric analysis – stated by the WHO as reliable and best fitting method for online analysis(1) – is used for reliable and accurate results and low total cost of measurement (TCM).


  • Aluminium Al
  • Arsenic As
  • Cadmium Cd
  • Cobalt Co
  • Chromium Cr
  • Copper Cu
  • Iron Fe
  • Lead Pb
  • Manganese Mn
  • Mercury Hg
  • Nickel Ni
  • Silver Ag
  • Zinc Zn

  • Spectrophotometer
  • Ion selective electrode
  • Titration

Other Parameters:

  • Cyanide CN
  • Ammonia NH3, Nitrate N, Phosphate PO4
  • Turbidity
  • Colour
  • Acid Capacity 4.3
  • Base Capacity 8.2
  • Total hardness

Measurement Ranges:

The measurement range is adjusted by path length of light and chemistry.
The measurement range starts at 5 ppb and ends at high ppm range. For drinking water applications it starts at 5 ppb and goes to 1000 ppb or 10 ppb to 2000 ppb.
The installed automated dilution unit can expand the range by a factor of 10 (please keep in mind that resolution is the same as not diluted but the error of measurement will increase). Arsenic measurement range for drinking water is from 1-20ppb.

Measurement Principle:

The measurement principle is spectrophotometric based on Lambert-Beer’s law. Metal is measured as chelate complex between metal ions in the waste water and sensitive spectrophotometric reagent dye. Change of the intensity of the visible light throughout cuvette containing formed metal complex is directly proportional to metal concentration.


The chemistry is proprietorial and developed by Seibold Wasser for online measurement purposes. All of our chemistry (buffer and dye) used for heavy metal analysis are NOT TOXIC or NOT HAZARDOUS. We deliver world wide ready made solutions.


All SEIBOLD analysers are named after Viennese Composers. The main task of the Composer is to combine different musical instruments to a wonderful sound. The same counts for analysers.
Perfect analysers combine and adjust chemistry, electronics and mechanics to get the best in class measurements as well as low maintenance and over all a low TCM.
(and we dislike strange number and letter combinations for great instruments!)

Seibold Wasser – COMPOSER at a glance:

  • Robust design.
  • Minimal maintenance.
  • Easy handling and long living.
  • Highest accuracy of measurement and high precision.
  • Suitable for mission critical applications.
  • Automated cleaning and calibration and dilution.
  • Can perform complex control tasks via analogue and digital communication.

(1) Connecting the dots. Complexity drives measurement technology used in on-line and process analysers. WHO Drinking Water Guidelines, Table 8.4.

Seibold Wasser Analyser Series for Heavy Metals

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