Introduction Technology of closed-vessel microwave assisted digestion/extraction and instruments related to have been developed up to now, it has been widely used by the analytical chemistry worker because of its high efficiency of sample treating. As the analysis tasks increase with each passing day, single vessel high pressure microwave digester is no longer competent. New instrument is needed to treat multiple samples simultaneously and freely controlled. However, when multi-vessel digestion is in progress, components of each sample treated in the digestion vessel is different, which cause the difference of chemical reaction rate and pressure. The existing microwave digestion instruments that equip with single-point temperature and pressure measurement (measure only one vessel’s pressure to indicate all the other vessels’) only check the main vessel can not guarantee the safety. Therefore, with large funds invested, our company’s scientific researcher spent 2 years in tackling the key problem and designing XT-9912M Intelligent Microwave Sample Preparation System. This instrument has a 65L super large volume microwave resonance radiation cavity, by the innovative technology of independent pressure measurement and temperature control, each vessel’s temperature and pressure may be real-time measured and controlled, which works out the fatal weakness of present multi-vessel microwave digester that monitor only one vessel’s pressure to indicate all the other vessels’. The user may do digestion freely from 1 to 12 vessels; using an advanced high frequency and large power resonance type program control high-tension microwave electronic power, achieves nonburst continuous wave output microwave power (0-1300W) stepless adjustment, power outputting is steady and reliably. These innovative designs and a series of high and new technology satisfactorily solved the present microwave digester’s contradiction between safety and working efficiency, break through the bottleneck that hamper the farther development of microwave digestion technology. Power and frequency: high frequency high power resonant program-controlled high-pressure microwave power. Industrial-grade double magnetron microwave power output range, 0 ~ 2000 w (arbitrary regulation); Microwave frequency, 2450 MHZ; Microwave radiation furnace chamber: round barrel stainless steel furnace chamber volume, 70 l. Furnace cavity surface for multilayer PFA corrosion resistant coating, long life, easy to clean; Sample size and the quantity: each sample digestion tank volume, 100 ml; Can dissolve sample number at the same time, 1 to 12. Sample loading ways: at the top of the rotating horizontally oven door, by the top load/take out the samples. Temperature monitoring methods: using non-contact temperature sensor, real-time scanning and monitoring all the real temperature of a sample solution, and display the temperature change curve. Pressure monitoring method: based on the high elastic disc metal shrapnel combination, such as optical ranging system principle and design of the contact pressure sensors, real-time scanning and monitoring of all internal digestion tank samples real pressure, and display the pressure curves. Temperature - pressure measuring system, temperature measuring range: at room temperature to 300 ℃ (plus or minus 0.1 ℃). Pressure range, 0 ~ 10 MPa (+ / - 0.01 MPa). High pressure digestion tank: frame type high pressure digestion tank, outer tank for imported high strength PEEK materials, the inner pot for imports of modified ptfe (TFM). The highest pressure 15 mpa or greater, heat-resistant 300 ℃ or higher; Multiple security: the instrument is equipped with up to 10 kinds of active and passive safety protection function, including industrial high strength round barrel furnace chamber and overhead type blast furnace chamber door design, complete samples real temperature/pressure real-time monitoring and protection,
Introduction Technology of closed-vessel microwave assisted digestion/extraction and instruments related to have been developed up to now, it has been widely used by the analytical chemistry worker because of its high efficiency of sample treating. As the analysis tasks increase with each passing day, single vessel high pressure microwave digester is no longer competent. New instrument is needed to treat multiple samples simultaneously and freely controlled. However, when multi-vessel digestion is in progress, components of each sample treated in the digestion vessel is different, which cause the difference of chemical reaction rate and pressure. The existing microwave digestion instruments that equip with single-point temperature and pressure measurement (measure only one vessel’s pressure to indicate all the other vessels’) only check the main vessel can not guarantee the safety.
