Flexibility and performance that make the difference
The SK-15 and the MAXI-44 new digestion rotors feature unique Milestone MDR technology to control the inner pressure of all vessels in complete safety. This 'vent and reseal' technology for pressure release is the foundation of Milestone's leadership in microwave digestion.
The SK-15 and MAXI-44 offers both high quality digestion and high sample throughput.
A large selection of high purity quartz and TFM inserts are available for these rotors to work with smaller sample amounts or to minimize the dilution factor of analytical solution.
Our microwave digestion systems can be used with a wide range of rotors and accessories providing a flexible, versatile and productive platform for digestion and extraction processes, microwave synthesis, protein hydrolysis and vacuum evaporation. For example, our selection of extraction rotor with flagship fastEX-24 with disposable vessels can extract up to 30 grams of sample with minimum solvent volume.
Two completely new rotors offering both high quality digestion and high sample throughput are available for the ETHOS UP. The SK-15 and the MAXI-44 feature the unique Milestone MDR technology for controlling the inner pressure of all vessels in complete safety. This 'vent- and reseal' approach (#ancora) for pressure release is the foundation of Milestone's leadership in microwave digestion.
Finally, a large selection of high purity quartz and TFM inserts (link) are available for the SK-15 and the MAXI-44 rotors for smaller sample amounts or to minimize the dilution factor of the analytical solution.
High Pressure Rotor
The SK-15 is a high-pressure and high-temperature rotor featuring up to 15 TFM vessels with a volume of 100 ml and suitable for all applications. It ensures high quality digestion of even the most difficult and reactive samples, such as polymers, pharmaceuticals, alloys, geological materials and large sample amounts of food and feed with high fat content. The SK-15 rotor is fully compliant with commonly used standard methods, such as the US EPA 3015, 3051, and 3052.
The MAXI-44 is a high-throughput rotor featuring up to 44 TFM vessels with a volume of 100 ml and suitable for a wide range of samples, typically environmental and food/feed. It is perfect for routine applications, as it combines an unmatchable ease of use with the highest sample turn-around-time available today from the market. The MAXI-44 is fully controlled by a contact less sensor to control the temperature and pressure of each vessel.
With the comprehensive choice of rotors and accessories available, you can turn the ETHOS UP and ETHOS EASY into a versatile platform able to perform also solvent extraction, protein hydrolysis, vacuum evaporation and alkaline fusion.
With the comprehensive choice of rotors and accessories available for the ETHOS UP, you can turn it into a platform able to perform also solvent extraction, protein hydrolysis, vacuum evaporation and alkaline fusion.
All Milestone rotors feature an enhanced 'vent-and-reseal' technology for controlling the inner pressure of all vessels with complete safety. This patented (US Patent 5,270,010) technology provides the operator with unsurpassed safety and performance capabilities: highest temperature and pressure, highest safety standards, ease of use, and very fast cooling (180°C to 40°C in 10 minutes). While other systems use membranes or burst disks that render a vessel useless after venting, the Milestone system releases only the excess pressure from the vessel. This ensures that there is no stress to the door of the microwave system and no loss of sample as could happen in the case of a membrane or disk bursting. The illustration shows 'vent-and-reseal' in action: the vessel cap is held in place by a dome-shaped spring (1). In the case of over pressure due to a highly exothermic reaction, the spring is flattened, allowing the cap to lift up slightly (2) releasing excess pressure. Immediately the excess pressure is released, the spring reseals the vessel (3), and the digestion continues. There is no loss of sample and no clean up needed. The microwave program continues to completion and no re-run is required. While there are other methods of venting, only Milestone has 'vent-and-reseal' technology.
Higher safety and reliability
Low running costs
The final method of venting is "self-regulating" and is used in the MAXI-44 rotor, and high-throughput rotors supplied by other manufacturers. These extreme throughput rotors were developed to address the needs of labs that process larger sample volumes on a routine basis. Self-regulating vessels are very easy to assemble/disassemble and rely on the Teflon sealing plug inside the cap deforming to release pressure. Their compact design results in more moderate temperature and pressure capabilities, but allows for a large number of vessels to fit onto the rotor. These characteristics make self-regulating rotors ideal for easy to moderate applications such as clinical, environmental, food, etc. Most recently, some manufacturers have applied the self-regulating approach to high pressure rotors designed specifically for more challenging sample types. Since self-regulating vessels are designed to vent, incomplete or unsatisfactory digestions may be observed given that the pressure loss does not allow the mandatory temperatures necessary for complete digestion to be achieved.
Other Method of Venting
There is another approach to venting, but it implies limitations compared to Milestone's Vent-and-Reseal and Self-regulating technology.
This method employs a simple burst disk in the cap which is designed to fail in an over pressure situation, instantly releasing all pressure in the vessel. When this happens, instantaneous boiling occurs, the sample contents are lost and the run has to be manually stopped. Significant clean up of the cavity is required, and corrosion of the cavity and internal components will occur. The illustration compares the burst disk approach with 'vent-and-reseal': the red line shows the complete loss of pressure when a burst disk fails, and the whole run is stopped. The blue line shows what happens with Milestone's 'vent-and-reseal' technology: excess pressure is gently released at just over 30 bar, and the digestion continues to completion, with no loss of sample.
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