Karl Fischer Titrators

Efficient Water Content Determination with Automated Karl Fischer Titration Solutions

A Karl Fischer (KF) titrator is an instrument that is used to determine the water content in liquid or solid samples. Accurate determination of water content is essential for ensuring the quality of many products, such as food, pharmaceuticals, and batteries. Our automatic KF titrators simplify sample handling and eliminate the risk of human error, delivering highly reproducible and accurate results within a matter of minutes.

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FAQs

How does pre titration work with METTLER TOLEDOs Karl Fischer titrators?

With the one click start of your Karl Fischer analysis, the pre titration is executed automatically by the method. During this step, the sample determination cannot be started and the keys on the terminal will appear grey. Once the pre titration is finished and no water is present in the cell anymore, the titrator switches to standby mode and the keys will appear white to signal that the sample can now be titrated.

 

When should I use the cell with or without the diaphragm?

The C20 and C30 are available with two different coulometer cells – with or without a diaphragm. For most applications, we recommend the cell without the diaphragm because it is almost maintenance-free. Due to its innovative design, this diaphragm-free cell from METTLER TOLEDO can even be used for the determination of water in oils.

The version of the cell with a diaphragm is recommended for applications such as the determination of moisture in substances containing ketones. It is also recommended if the best possible accuracy is required.

 

How do I know when to replace the molecular sieve in the drying tubes on my Karl Fischer titrator?

The most practical solution to this question is to add some blue silica gel to the top of the drying tube to serve as an indicator. As soon as the first trace of pink appears in this gel layer, it is time to change or regenerate the molecular sieve. Naturally, an increase in background drift can also indicate that it is time to replace the molecular sieve.

 

How often do I need to replace the solvent in the titration beaker of my Karl Fischer titrator?

The first and most obvious answer to this question is that the solvent should be replaced as soon as the sample no longer dissolves. This, however, is only one of the reasons for changing the solvent. A second less obvious reason applies in the case of two component reagents where the titrant contains iodine, and the solvent contains all the other components necessary for the Karl Fischer reaction. One of these other components is sulfur dioxide and this can become depleted long before the dissolving capacity of the solvent is exceeded. As a general rule the solvent in these two component systems has an approximate water capacity of 7mg of water per mL of solvent. This means that in theory 40mL of solvent can accommodate 280mg of water before the solvent needs to be changed. As the typical titrant has a concentration of 5mg/mL, 280mg of water would require 56mL of titrant.

 

Can the InMotion KF oven be connected to every Karl Fischer titrator?

No, the InMotion™ KF oven can only be used with the Compact V30S as well as the T7 and T9 Excellence titrators

 

The drift value is high in my Karl Fischer titrator, what do I do?

To reduce the drift value, make sure all the openings on the titrator have been greased (e.g. tube inserts, electrodes, adapters, etc.) and that you use dry and fresh molecular sieves and silica gel in your drying tubes. We recommend exchanging your molecular sieves every 6 weeks. If you still have high values, try to gently shake the titration vessel to collect traces of water from the glass walls.

 

What’s the difference between the C10/20/30SX and the C10/20/30SD?

The Compact C10/20/30SX Karl Fischer titrators do not possess a diaphragm. Without it, there’s no risk of getting it clogged and, hence receiving incorrect results. The C10/20/30SD Compact titrators possess a diaphragm, which can improve the drift value.