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Welch 2028 Self-Cleaning Dry Vacuum System
SELF-CLEANING DRY VACUUM SYSTEMS™ FOR ROTARY EVAPORATORS
Self-Cleaning Dry Vacuum System are complete vacuum solutions for rotary evaporation. All three systems (2025, 2027, 2028) feature rugged corrosion resistant PTFE diaphragm pumps for low maintenance and long life. All models feature adjustable vacuum to optimise for a variety of solvents. Also included with all models: digital or analog vacuum read-out, inlet and outlet traps to protect the pump and exhaust line from liquids, gas ballast or no bumping/foaming key as an emergency “bump stop”, and automatic self-cleaning purge at shutdown.
The self-cleaning feature and patent pending vacuum control technology contribute to the pumps’ long diaphragm life.
• Anti-bumping/foaming feature with controlled evaporation rate
• Rugged corrosion resistant PTFE construction
• Self-cleaning for long life
• 2 Torr (2.7 mbar) models strip DMF at 35°C bath temperature
• 9 Torr models (12 mbar) models strip most common solvents
• Programmable 2028 features walk away automation
Model 2028 programmable high vacuum. Five user entered programs with one or two solvents and times, keyboard or electronic dial vacuum selection, digital vacuum display with menu enabled programming.
Free Air Displacement: 35 L/min
Ultimate Pressure: 2 Torr
Gas Ballast: No
Pump Mechanism: Diaphragm
Maximum Vacuum,in,Hg 29.85
Tubing Needed, I.D.: 7mm
Intake Thread: 3/8"
Exhaust Thread: 3/8"
Dimensions: 42.2 x 30.5 x 28
202801 Wired for 115V, 60Hz, 1 PH with N. American 115V Plug
202801A Wired for 230V, 60 Hz, 1 PH with N. American 230V Plug
202803 Wired for 230V, 50Hz, 1 PH with Cont. Euro. (Schuko) Plug
202805 Wired for 100V, 50/60Hz, for Japan