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  Closed-loop carrier gas circulation
  Closed-loop carrier gas circulation

Online determination of water in oil samples

The gas extraction is the ideal method to detect water content in oil samples and viscous substances. The OnlineH2O is suitable for the continuous analysis of water in oil samples.

Trace amounts of water can be measured with the special heating chamber for oils. The sample has no contact with the reagent. Therefore the consumption of reagent is low and the detection sensitivity is high.

The oil sample is transferred automatically from sampling point of running process by using the pump module. The sample is injected into heating oven without any contamination. Oil sample volumes can be used in a range from 0.01 up to 20 mL depending on water content.

The sample can be heated out with temperature program or isothermal heating. The measurement is carried out in the measuring cell with titration method according to Karl Fischer. After analysis, the used oil sample flows out through a valve or returns to the running process.

With closed-loop carrier gas circulation, any additional gas drying is no longer necessary: the carrier gas is continually titrated to dryness within the closed loop. The total dryness of the gas enhances the water desorption from the sample. Moreover, sensitive samples can be heated out very gently. Degradations and side reactions are eliminated.


  • Transformer oil regeneration
  • Oil treatment plant
  • Refineries
  • Pipelines
  • Crude petroleum monitoring


  • Closed-loop carrier gas circulation
  • No contact of sample with the reagent
  • Low consumption of reagent
  • Water determination down to 0.1 ppm
  • Absolute measurement without calibration or titer determination
  • No sample preparation
  • For sample amounts from 0.01 up to 20 mL
  • Short measuring time
  • No blank value, low drift
  • Freely selectable heating temperature
  • Return of oil sample into system possible
  • Applicable for monitoring over long period


The sample ways are coupled directly with monitoring process. Thereby the oil sample is transferred into the OnlineH2O without any contamination. The sample transfer can be adjusted to an automatic procedure. 

The control system is adjustable for various parameters:

  • Delivery rate of dosing pump
  • Rinsing steps
  • Emptying of oil chamber

Datasheet OnlineH2O



ECH Elektrochemie Halle GmbH
Otto-Eißfeldt-Straße 8
06120 Halle (Saale)

Tel.: +49 345 279570-0
Fax: +49 345 279570-99
Mail: info@ech.de

Sales and Service Center UK

ECH Scientific Limited
Building 69, Wrest Park, Silsoe
Bedfordshire, MK45 4HS
United Kingdom

Tel.: +44 1525 404747
Fax: +44 1525 404848
Mail: info@ech.de

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