Fluidquip Australia

Enquire Now

Hot Block Digestion System (Automatic)

Image 1
Image 2

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.


 Contact us on 02 4735 5054 or 0061 2 4735 5054 (from NZ) or

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.

Contact us on 02 4735 5054 or 0061 2 4735 5054 (from NZ) or

SEAL Heating Block Applications: 

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

Contact us on 02 4735 5054 or 0061 2 4735 5054 (from NZ) or

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.

Contact us on 02 4735 5054 or0061 2 4735 5054 (from NZ) or

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 www.seal-analytical.com

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: www.seal-analytical.com


Contact us on 02 4735 5054

website design © 2009 stralia web
Experience BlueMountainsAustralia.com
website content © 2009 Fluidquip Australia