Kjeldahl Protein/ Nitrogen Analysis

Kjeldahl method is the universally accepted method in world and widely used in the laboratories for nitrogen and protein analysis such as in food & beverage, agricultural products, and environmental samples. This method consists of three main steps, which are digestion, distillation and titration.



Digestion Blocks

For your nitrogen or protein analysis, the digestion blocks are available from basic that can be customized to individual needs to fully automated digestion where you can leave the digestion unattended. With a fully automatic digestion system, you save even more time with the fully automatic motor rack.

Standard in all our digestion blocks are selectable programs, timer functions and possibility to select between Celsius and Fahrenheit. Our more advanced blocks offer an automatic motor rack.

Distillation Unit

Our distillation unit offers full control of the distillation process at a low cost. The instrument is a Kjeldahl apparatus with full control of alkali, water and steam. There are two versions of the steam distillation system – one with automatic addition of receiver solution and one without. Both can be upgraded to Fully Automation Distillation Unit.

Fully Automatic Distillation Unit

Fully Automation Distillation Unit offers innovative, precise and cost efficient solutions for Distillation, Titration and determination of protein according to the Kjeldahl method. Unique Predictive Titration, patent pending, gives several advantages in the lab.

Fully Automatic Distillation Unit with Autosampler

Fully Automatic Distillation Unit with Autosampler is a Kjeldahl apparatus capable of steam distillation, titration and automatic exchange of samples. The Autosampler is fully automatic and is able to handle up to 25 different samples automatically. The principle is simple, insert a tube rack with samples and return later to collect the results.


The Scrubbers are built to work in an environment with an excess of corrosive fumes and high heat during digestion. We recommend using scrubbers together with our digestion blocks.functions and possibility to select between Celsius and Fahrenheit. Our more advanced blocks offer an automatic motor rack.

Kjeldahl Consumables

Good analysis requires preparation and supplies of reliable consumables like Glass Tubes of Borosilicate and Kjeldahl Tablets.

LabConnect Software

OPSIS LiquidLINE believes that all Analytical Laboratories should benefit from the advantages of modern information technology, by using Laboratory Information Management Systems when possible (LIMS).