Wilten Instruments has a wide range of instruments. Because of the variety of options on some products we are not able to mention all of them on our website. Complete information is available on demand.
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Aqua 40.00 Basic

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The AQUA 40.00 Basic Module is the essential device for microcoulometric determination of water content according to Karl-Fischer-Titration in liquid samples and gases.

This coulometric titration is based on the electrochemical generation of the iodine needed for the determination. There is no need for any working with titer of KF-reagent and their adjustment. The optimized measuring cell allows very low background drift and short preconditioning times.
Therefore the coulometric method can be used as a down to trace ppm-analysis. The sample to be analyzed is injected right into the measuring cell. The titration current is adjusted automatically and continuously to the amount of water. Short measuring times are realized.
Measuring cells without diaphragm can be used. Many applications do not require a diaphragm, so only one coulometric reagent is needed. All customary KF-reagents are suitable.


Measuring range 1 µg – 100 mg, absolute
Resolution 0.1 μg
Reproducibility ± 3 µg for 10…1000 µg 3 % for > 1 mg
Generator current infinitely variable from 0 up to 250 mA
Sample volume 0.01 – 20 ml (direct injection)
Volume of reagent in measuring cell 100 ml
Analysis duration 5 min (dependent on water content)
Results in μg, μg/l, mg/l, ppm, %, mC, customized with formula generator
Indication biamperometrical, polarization with square-wave voltage

Extension Modules

Vario Head Space Module

  • Universal module for all kind of samples: solids, pasty substances and oils
  • Closed-loop gas circulation, no dried additional carrier gas is necessary
  • For samples that change the water content if in contact with ambient air
  • Heating procedure with definable temperature programs
  • Analysis of closed sample vials for hygroscopic samples
  • Suitable for 2 R – 50 R vials
  • Automatic identification of sample rack

Oil Module and Solid Module

  • The ideal method to handle oils, solids and pasty substances
  • Heating procedure with definable temperature programs
  • Closed-loop gas circulation, no dried additional carrier gas is necessary
  • Heating module of oils is used for oil volumes up to 20 ml
  • Heating module of solids is used for very small sample amounts (below 10 µg)

High Temperature Oven

  • This oven can heat out the sample at temperatures ranging up to 1300 °C
  • A special valve system transports the sample into the oven without interrupting the carrier gas circulation
  • Internal drying of carrier gas



  • Solvents
  • Oils and fats
  • Fuels, biodiesel
  • Hydraulic and brake fluids
  • Gases


  • Infinitely variable electrolysis current for very fast analysis
  • Adjustment of titration rate to current amount of water to be titrated
  • Low background drift
  • All customary KF-reagents are suitable
  • Defined methods for measurement
  • Status display through large-scale colouration
  • Additonal heating modules can be used