Laboratory Technologies

Block Digestion System

Block Digestion System

A SEAL heating block provides computer controlled kjeldahl digestions of  agricultural, soil and food products for nitrogen and phosphorous analysis. Even the most complicated digestions can be automated. The  SEAL Analytical BD50 & BD28 Block Digestion Systems are laboratory heating blocks that give options to precisely control digestions of up to 50 samples simultaneously. Sample digestions can even be run unattended overnight. Digestion methods are available for TKN (Total Kjelhdahl Nitrogen), Total Phosphorous, Mercury Digestion, COD Chemical Oxygen Demand Digestion and more. 

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Hot Block Digestion System (Automatic)

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SEAL Analytical

The  AIM600/ SEAL Analytical heating block is a Block Digestion System for laboratories that performs kjeldahl digestion and acid digestions of large numbers of agricultural, soil, plant and food samples under computer controlled conditions.

About the SEAL Analytical Laboratory Heating Block 

The SEAL Analytical Block Digestion System is a heating block for laboratories available as a 50 place unit for 75ml or 100ml digestion tubes  (BD50) or a 28 place unit for 250ml (BD28) digestion tubes.

System comprises:

  • Heating block
  • Microprocessor controller
  • Tube rack/draft shield
  • Set of digestion vessels
  • Cooling stand that supports the tube rack above the block. 

The overall unit has been designed for durability and robustness. The heating block has a stainless steel covering to provide a greater measure of acid resistance. Similarly, the tube rack and cooling stands are also manufactured from the highest quality stainless steel.


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Advantages of the SEAL Analytical Heating Block

  • This heating block digests large sample numbers under precisely controlled conditions
  • One of the highest sample capacities in the market with the greatest sample throughput.
  • A thick 316 stainless steel covering, providing greater measure of acid resistance.
  • Extremely accurate temperature range (+/-2 Degrees C) due to specially designed heating plates, providing even sample evaporation and more reproducible results
  • Short heat up time, allowing a quicker digestions process and increasing your sample throughput.
  • Programmable controller provides safer digestion, allowing you to increase the temperature by 1 degree C/ minute (no "bumping" of the digests).
  • Store up to 20 different programs of up to 30 steps each.
  • Automatic start, allows your block digestion system to work unattended at night, saving time and increasing lab productivity.
  • Electronics contained in a separate module located outside the fume hood and away from corrosive acid fumes.
  • Cost effective, typically about a quarter of the cost of a microwave digestion system.
  • Unlike microwave systems the BD28s and BD50s  block digestion systems have no ongoing consumable costs.
  • Unique flat plate design tightly regulates temperature ensuring all samples are digested evenly.
  • Safe with no requirement to move samples to more "favourable positions", protecting against bumping and splattering of reactive samples.
  • Sample integrity protected with automatic sensing of power failures, and subsequent holding of the digest to protect samples.

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SEAL Heating Block Applications: 

  • TKN (Total Kjeldahl Nitrogen)
  • Total Phosphorous
  • Mercury digestion
  • COD chemical oxygen demand digestion and more

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Comparison of a Block Digestion System to beakers on a hot plate

The SEAL Analytical BD50 and BD28 computer controlled heating blocks provides better quality results, higher productivity of sample throughput and uses less fume hood space per sample. It's also an automated process and frees the operator to perform other tasks. Digesting samples in a beaker on a hot plate requires constant vigilance and care. A Block Digestor allows you to digest 50 samples simultaneously with minimal operator supervision. All samples on the BD50 and BD28 heating blocks are processed at exactly the same temperature. Competing hot plates have hot and cold spots, and samples are often digested at different temperatures, giving inconsistent/ incorrect results. A SEAL computer controlled heating block regulates the exact digestion time and heating rates, whereas on a standard hot plate, the times are dependent upon an operator to remember to change the digest conditions.


Comparison of Block Digestion Systems to Microwave Digestion System

While microwave digestion systems can accelerate the digestion process, block digestion systems still offer a number of distinct advantages:

Larger runs- the SEAL BD28s and BD50s  block digestion systems digest more samples and larger sample sizes  in one batch. On a microwave digestion system, you are limited to 0.5g for inorganic samples, less for organic samples, the BD28s and BD50s allow you to use ten times this amount.

Less operator involvement- a microwave digestion system requires regular attention by the Operator, disassembling and reassembling digestion vessels. on the BD28s and BD50s, once you add samples and acid, digestion proceeds without intervention by the operator. The high operator involvement for the microwave digestion unit tends to negate the faster digestions.

More flexibility- It is possible to use a wider range of acids including sulphuric acid and perchloric acid on the BD28s and BD50s. On a microwave digestion system, sulphuric acid has too high a boiling point and will melt the PTFE vessels while perchloric acid can be explosive under pressure. It is not possible to perform kjeldahl digestions in a microwave system but you can on the BD28s and BD50s Block Digestion Systems.

Cost-The BD28s and BD50s Block Digestion Systems are much cheaper than microwave digestion systems, typically about a quarter of the cost. Microwave digestion systems also have on-going consumable costs, such as rupture membranes and digestion vessels have finite life. The BD28s and BD50s have no on-going consumable costs.

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Seal analytical logoSEAL Analytical Limited is a UK based developer of automated wet chemistry discrete analysers for use in environmental and industrial laboratories.  SEAL has over 25 years experience with automated discrete analysis.  Visit

In 2002, SEAL formed a wholly owned US subsidiary based in Milwaukee, Wisconsin to promote the sales of wet chemistry discrete analysers in the US and Canada.  Subsequent to this, SEAL's international roll-out continued with distributors being approved in European and Asian Pacific countries.

In 2004, SEAL became the exclusive distributor of Bran+Luebbe Continuous Flow Analysers in the USA, UK and Ireland.

In November 2006, SEAL completed the acquisition of the Bran+Luebbe Continuous Flow Analyser (CFA) and Near InfraRed  (NIR)  Analyser businesses.   This brings together over 50 years of CFA analysis experience of B+L , formally Technicon Industrial Systems, with SEAL's 25 year track record in discrete analysis, allowing SEAL to offer a truly complimentary solution in Automated Chemical Analysis for environmental and industrial laboratories throughout the world.

In August 2008, SEAL joined the Porvair group of companies. Porvair is a specialist filtration and environmental technology group.  This will allow SEAL to continue its dynamic growth  and success worldwide.


Visit SEAL Analytical website:


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Heating Block (Manual)

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SEAL Analytical

The SmartBlock II uses a graphite heating block for fast, simple and reproducible digestions for trace metals. SmartBlock II is designed and manufactured by Thomas Cain Inc (a SEAL Analytical company).

SmartBlock ll- Graphite Digestion Block

SmartBlock ll is the ideal heating block for fast, simple and reproducible digestions for trace metals. It is the ideal bench-top laboratory heating block and is an economical alternative to traditional laboratory methods and for labs with limited space. This heating block is compact, economical, easy-to -use and can simultaneously digest up to 60 samples evenly and safely.

Replacing your traditional laboratory methods with a heating block will not only significantly improve your digestions it will also dramatically improve laboratory safety.


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SmartBlock ll Heating Block Advantages

  • Rugged design, with corrosion proof materials contributes to a long life and also eliminates sample contamination when digesting samples
  • Digests samples fast with uniform heat distribution from ambient to 180oC
  • Stable, even temperature eliminates the need to move/ rotate digestion tubes
  • Insulation ensures minimal heat transfer to surroundings
  • Ideal for use with EPA methods and for digestions requiring heating below 180oC
  • Simultaneously digest up to 60 samples
  • Select from 100ml, 50ml or 16ml digestion tubes
  • Simple to use
  • Large easy to read LED temperature display
  • Eliminate the need for digestion beakers, volumetric flasks, graduated cylinders, storage containers etc
  • Built-in safety features protect samples and operators when digesting samples.

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SmartBlock ll Applications

SmartBlock ll is ideal for trace metal digestons in:

  • Soils
  • Sludges
  • Drinking water
  • Wastewater

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DEENA 3 Automated Sample Digestion

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SEAL Analytical

DEENA 3  fully automates the digestion process ensuring each sample is treated exactly the same, safeguarding against human error. Ideal for safe, reliable, sample preparation and metals digestion.

DEENA 3 Automated Acid Digestion for Metals


The DEENA 3 is manufactured by SEAL Analytical (Thomas Cain brand in Asia). SEAL Analytical manufactures automated chemical addition, sample preparation and digestion systems used in the analysis of mercury and metals in environmental laboratories. With a SEAL Analytical system you not only automate the steps involved in sample preparation you also eliminate the manual dispensing of corrosive acids and other dangerous reagents.


New! 72 position with 50ml vials, heat to 300oC, carbon fibre arms, corrosion resistant, accurate fill to volume, USB connection, bluetooth compatible, internal air purge.


DEENA 3 is a sample digestion system that fully automates the digestion process ensuring each sample is treated exactly the same, safeguarding against human error.


DEENA 3 will:

  • Accurately dispense small volumes of reagents into sample tubes
  • Mix thoroughly
  • Apply heat
  • Fill to volume after digestion is completed



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DEENA 3 Model Options:

The DEENA 3 digestion system is available in the following configurations:

72 Position Block for 50ml Tubes


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DEENA 3 Advantages

The DEENA 3 is ideal for reliable metals digestions.

  1. Safer digestions with the elimination of manual dispensing of corrosive acid and other dangerous reagents
  2. Small footprint, allows bench top placement and saves fume hood space
  3. Automates the digestion process and frees up laboratory personnel
  4. Reliable and repeatable automation with every sample treated exactly the same
  5. No cross contamination
  6. No direct contact with sample or vial
  7. Even heating of every sample
  8. Time saving features such as overnight digestions and standby "warm" feature to rapidly bring samples up to digestion temperature
  9. Suitable for EPA approved methods
  10. Durable- constructed to reliably run in the harsh digestion environment it operates in
  11. Real-time reporting and sample tracking
  12. Intuitive & completely customisable software
  13. Commonly used methods are pre-loaded.

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Optional DEENA 3 Accessories


Self Contained Fume Hood- Free up valuable hood space with this self-contained HEPA filtered fume hood. Connecting directly to your existing duct work, this allows the DEENA 3 to operate safely on your laboratory bench. Highly recommended accessory.


Vial Types Available- Available in 15 ml, 50 ml, 100 ml. Polypropylene Vials- Can be heated up to 135°C. PTFE Vials- Can be heated up to 200°C. Glass Vials- Can be heated over 200°C


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Thomas CainSEAL Analytical, the leading global supplier of automated colorimetric analyser instrumentation acquired  Thomas Cain, a manufacturer of automated chemical addition, sample preparation and digestion systems for the analysis of mercury and metals to environmental laboratories throughout the world. There is also a range of automation options for these systems which reduce or remove the need for manual intervention in hazardous processes during the sample digestion. 


Thomas Cain Inc website

SEAL Analytical website

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