|Principles of Operation|
The PYRO-SA Microwave Sulfated Ashing System consists of a stainless steel chassis, a ‘Sulfated Ashing Module’, VAC-1000 Acid Scrubber, and an external stand-alone controller.
Located inside the cavity is a muffle furnace constructed using lightweight Al2O3. Al2O3 is microwave transparent and its excellent insulating properties enable extreme temperatures to be maintained inside the furnace while still insuring a comfortable working environment for the operator. Microwave energy produced by the magnetron is absorbed by a silicon carbide plate located in the roof of the muffle furnace. Heat is dispersed evenly from the top down insuring an even heating of all crucibles. The PYRO-SA can accommodate the operator’s crucible of choice. Porous, ceramic honeycomb frits are built into the wall and ceiling of the muffle furnace allowing a constant stream of air, generated by the PYRO-SA's built-in exhaust fan, to pass over the crucibles.
The ‘Sulfated Ashing Module’ consists of a quartz tube which extends to within the muffle furnace and ensures the acid fumes are pulled from the muffle cavity. Fumes are led through a condensing tube and into a collection container and ultimately funneled to the attached Milestone VAC-1000 Acid Scrubber. The VAC 1000 first condenses the fumes and any remaining fumes are bubbled through a sodium hydroxide scrubber where they are neutralized and then exhausted.
The ashing method is precisely monitored and controlled via Milestone’s unique EasyCONTROL software. Using temperature feedback from within the furnace, EasyCONTROL regulates energy output to ensure that the operator’s desired temperature program is being precisely followed.