Follow us...


Search News Archives

News Channels


New Laboratory Products

Lab News

Research & Case Studies

Microscopy | Image Analysis

Separation Science

Brochures & Literature


Events | Webinars



Conferences | Events

Water in various gases – fully automated determination by coulometric Karl Fischer titration

publication date: Oct 16, 2015
author/source: Metrohm AG

Water is an unwanted constituent of all kinds of gases. Precise determination is therefore a must, e. g., in medical gases, noble gases, process gases, and welding gases.

metrohmThe 875 KF Gas Analyzer is a highly robust solution for this kind of analysis, combining precise sampling with the accuracy of coulometric Karl Fischer titration in a fully integrated, software controlled analyzer.

Water can be determined with various analytical techniques at trace levels. However, water in gases is a particular challenge: Most of the feasible methods need to be calibrated and can only determine the water content indirectly. In contrast, Karl Fischer titration measures the absolute amount of water in the gaseous matrix. Moreover, results do not tend to drift, as the reagent is exchanged at regular intervals. As Karl Fischer titration is a primary method, the sensor does not need to be calibrated either. Detection limits of the method lie in the single-digit ppm range (µg water/g gas).

The 875 KF Gas Analyzer is controlled by tiamo™, the leading control and database software for titration. The analyzer module consists of a robust sampling system with a mass flow controller at its heart. Moreover, the system is equipped with an integral evaporator for liquefied gases, an inlet filter to separate out particles, and an oil filter. The titration vessel with indicator and generator electrode (with diaphragm) and an 851 Titrando coulometer are also included in the module. Safety is provided by the strict separation of the gas-carrying system and the electronic area.

Applications documents available

Application Notes for the determination of the water content in the following gaseous matrices are available:

AB-357          Determination of water in gases and liquefied gases with the 875 KF Gas Analyzer

AN-K-055      Validation of the 875 KF Gas Analyzer with certified reference gas

AN-K-056      Determination of the water content in hydrogen gas



If you have not logged into the website then please enter your details below.



Popular this Month...

Our Top 10 most popular articles this month


Today's Picks...




Looking for a Supplier?

Search by company or by product


Company Name:




Please note Lab Bulletin does not sell, supply any of the products featured on this website. If you have an enquiry, please use the contact form below the article or company profile and we will send your request to the supplier so that they can contact you directly.

Lab Bulletin is published by newleaf marketing communications ltd




Media Partners