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Food analysis > Kjeldahl Digester

Kjeldahl Digester

Compact and efficient block digestion system for conducting safe Kjeldahl digestions and much more.

  • Various models are available with capacities ranging from 6 to 40 sample positions
  • 5'' touchscreen and Wi-Fi connectivity for accessing RAYPAnet
  • A complete solution when used in conjunction with our Scrubber


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Block digestion system

Explore the superior performance and flexibility of our Kjeldahl MBC Series digesters, indispensable for quality control laboratories in the food industry that need to process numerous samples accurately and at the same time. Available in six models, these digesters are capable of processing between 6 and 40 samples simultaneously, varying in tube size and the quantity of sample positions each model accommodates.

With over three decades of successful research and development, our Kjeldahl digesters are constructed from premium materials, ensuring longevity and durability. The system consists of a heating block, a back support, a rack for digestion tubes, a set of sample tubes, and a portable fumes collector.

Every model in the Kjeldahl MBC Series is equipped with a 5” touchscreen, Wi-Fi connectivity for result analysis via RAYPAnet, and allows for up to 10 user-free programs. Its new microprocessor enables setting the digestion temperature up to 450ºC offers two modes of operation: a steady temperature setting or a programmable sequence of up to 10 segments with adjustable duration and target temperature.

These digesters are the perfect choice to be used together with our Scrubber and Kjeldahl distiller for the pre-distillation digestion stage. Furthermore, they are designed to work seamlessly with our Fat Extraction System, facilitating the initial acid hydrolysis step of the sample.

MBC detalles 1


All parameters can be easily adjusted through a 5" touchscreen. The microprocessor features 10 programs that are customizable by name and can be modified by two operational modes, either maintaining a constant temperature or through up to 10 segments that can be adjusted by duration and target temperature. Additionally, the start or automatic conclusion of the test can be scheduled by date and time.


Every model comes with Wi-Fi capability, enabling connection to the RAYPAnet web platform from any device. Users can view test results in real-time or retrospectively through the platform's historical test log. Data can be exported as graphs, and reports can be produced in both .CSV and .PDF formats for subsequent review, analysis, and archiving. Moreover, it allows for the simultaneous connection and management of multiple devices.

MBC detalles 2
MBC detalles 3


The main structure is crafted from stainless steel and coated with epoxy resin, ensuring exceptional strength and durability. The tube rack handles are thermally insulated, facilitating the safe handling of samples. The heating block, made from aluminum and insulated with rock wool and ceramic fiber, guarantees a uniform temperature distribution across all samples. The fume collector includes a drip tray to capture any condensed vapors at the end of a test, preventing spillage. Moreover, the heating block cover is coated with Halar® resin, adding an extra layer of protection. The system is equipped with a dedicated screen for authorized technicians and includes an access port for the insertion of an external validation probe. In the event of an error, the display will present an alert message, allowing for the swift resolution of the problem.


MBC scrubber ilustracion ok


The Kjeldahl digestion process employing a block digestion system connected to a Scrubber initiates with the preparation of samples along with their corresponding reagents. Each sample is placed into a tube, which is then positioned within the sample tube rack of the Kjeldahl Digester. This rack is subsequently inserted into the heating block of the Kjeldahl Digester, and the fumes collector is positioned above it.

The subsequent step involves choosing the suitable digestion protocol. After configuring the parameters and starting the program, the Scrubber is turned on, and the digester begins warming the samples, following specified intervals of time and temperature.

During the procedure, heating the samples results in the release of dangerous gases. It is essential, therefore, to effectively capture these vapors and channel them into the Scrubber using a vacuum pump.

In the initial phase of passing through the Scrubber, the gases undergo condensation as they travel through a cooling system. This stage serves as an initial phase of separation, removing suspended vapors and liquids and thus averting any rise in temperature or volume in the next washing phase. Subsequently, the process neutralizes and cleanses acidic or basic vapors, and a final filtration stage using activated carbon granules traps any residual particulates, guaranteeing emissions are both safe and purified.

In the final step, the Kjeldahl Digester allows for the extraction of the digestion tubes rack from the heating block, positioning it on the cooling position on the back support. During this entire procedure, the fume collector is carefully kept in place atop the rack containing the samples, while the Scrubber operates continuously until the samples reach a temperature suitable for safe handling.


Technical data

Sample positions
Compatible sample tubes (mL)
Adjustable temperature range (ºC)
Temperature stability at 400ºC (ºC)
Homogeneity at 420ºC (ºC)
External dimensions (L x D x H mm)
Net weight (Kg)
Power (W)
Voltage* (V)
Frequency (Hz)
*Other voltages and electrical configurations available on request.



Can I set a specific start date/time for the Kjeldahl digester?

Yes, the digester offers the functionality to be programmed for automatic initiation of the process at a predefined date and time.

Is it feasible to use the digester for fat hydrolyzation, as a preparatory step before fat extraction in some samples?

Yes, this is possible. However, it requires a different reagent than the one used for protein digestion.

Is it essential to attach a Scrubber to neutralize the gases produced?

Yes, integrating a Scrubber with the Kjeldahl digester is the optimal approach to neutralize harmful gases. Without proper suction and neutralization, gas leaks could occur during digestion, endangering the operator.

What is the typical duration for a digestion cycle in the Kjeldahl digester?

The digestion duration varies based on several factors, primarily the sample type. Typically, digestion takes about 90 to 120 minutes, which may vary if temperature ramps are utilized.

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