Welch, 202503, 1.7 l/min 9 Torr 1 Phase Self-Cleaning Chemical Duty Dry Vacuum SystemModel 2025 analog vacuum read-out, vacuum regulator, 9 torr ultimate vacuum for fast stripping of most common rotary evaporation solvents. Fast stripping of rotary evaporator solvents with boiling point < 110º C.Features:Digital or analog vacuum read-outInlet and outlet traps to protect the pump and Exhaust line from liquidsProminent emergency 'bump stop' switch for bumping/foaming controlAutomatic Self-cleaning purge maintains efficiency, extends diaphragm lifeFree air displacement: 35 L/min (1.2 CFM)Incremental ballast switch enables fast response to bumping / foamingComplete oil-free dry vacuum systems for rotary evaporators and concentrators. Corrosion-resistant PTFE diaphragm vacuum pump systems enable superior control and efficiency for each evaporation. Provides controlled solvent stripping in flasks up to 5 L. Includes analog gauge and vacuum regulation. Inlet and Exhaust separators protect pump and lab atmosphere. Applications:Controlled vacuum for Rotary evaporatorsCentrifugal concentrators, and other evaporative processes. Application Note: Value of Self-CleaningThe Self-Cleaning air purge cycle at the conclusion of each run maintains consistent performance and extends service intervals. This purge feature eliminates condensates in the pump's second stage and removes volatile substances before they can solidify. This purge resets the pump diaphragms to dry startup condition, enabling consistent solvent stripping rates run after run. Solidified substances can also be abrasive to the diaphragm, impairing performance and shortening diaphragm life.