Welch® Dry Pumps Cold Trap1 Applied Vacuum Technology for Centrifugal Concentrators Sample: Stand-Alone Diaphragm Pumps: Water and alcohol solutions2 DNA Pelleting Aqueous, acidic, or organic solutions DRYFAST® PTFE Pump 9 Torr 35 L/min Cat. No. 2044B-01 DRYFAST ULTRA® PTFE Pump 2 Torr 35 L/min Cat. No. 2042B-01 Key Advantages: Quiet, Oil-free Virtually maintenance-free solution for laboratory environment. Cost effective No oil changes, no cold trap for water/alcohol solutions. Smaller footprint than oil pump saves lab space. Application certified Developed for selected centrifugal concentrator applications to efficiently evaporate aqueous, acidic, or organic solutions when properly configured and with the chemical resistance to pump aggressive chemicals such as TFA, HCl, formic acid and acetic acid. Note: 1) Cold traps are not required to protect these pumps. Cold traps will condense vapors and increase effective pumping speed of system leading to improved drying times for aqueous, acidic or organic (B.P.>100 ˚C) solutions. 2) Cold traps are not required for water and alcohol solutions since these solutions are volatile. 3) Pumps listed are 115V, 60Hz. See Welch web site for other electrical requirements. Gardner Denver Thomas, Inc., Welch Vacuum Technology 7301 N. Central Avenue, Skokie, IL 60077 Phone: (847) 676-8800 Fax: (847) 677-8606 Email: [email protected] Web: www.welchvacuum.com Welch, DRYFAST and DRYFAST ULTRA are registered trademarks of Gardner Denver Thomas, Inc., Welch Vacuum Technology.

Welch® Pumps Applied Vacuum Technology for the Laboratory Application Welch Vacuum Pumps & Systems Flow Rate x Vacuum Unit Photo “Rotovap System” Volatiles, Low B.P. B.P. <100˚C Samples 0-5 Liter DRYFAST® System with regulator, gauge, condensate jars, self-cleaning auto-purge 35 L/min. x 9 Torr (12 mbar) “High Boiler System” DRYFAST ULTRA® System & Pump 35 L/min. x 2 Torr (2.7 mbar) DMF, Toluene, other non-volatiles Samples 0-5 Liter 35 L/min. x 2 Torr (2.7 mbar) “Concentrator Pump” 35 L/min. x 2 Torr (2.7 mbar) DRYFAST ULTRA SYSTEM Compatible with: SpeedVac® & CentriVap® 35 L/min. x 2 Torr (2.7...