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Welch™ Self-Cleaning Vacuum System

Complete oil-free dry vacuum systems for rotary evaporators and concentrators

Manufacturer: welch™  202701

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Catalog No. 01-257-121

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Description & Specifications


Horsepower 0.2hp
Voltage 115V
Hertz 50Hz
Height (English) 11.3 in.
Height (Metric) 28.7cm
Width (English) 12 in.
Length (English) 13.6 in.
Length (Metric) 34.5cm
Shipping Weight (English) 36 lb.
Shipping Weight (Metric) 16.4kg
Amperage 1.5A
Certifications/Compliance CE, CSA
Flow Rate 35L/min.
For Use With (Equipment) Filtration, vacuum ovens, aspiration, chamber roughing
Electrical Requirements 115V 50Hz
For Tube Size (English) 0.25 in.
For Tube Size (Metric) 0.63cm
Material PTFE
Model 2027
Weight (English) 30 lb.
Weight (Metric) 13.6kg

Corrosion-resistant PTFE diaphragm vacuum systems enable superior evaporation control and efficiency. Preserve your sample and your time with rapid, controlled solvent stripping from flasks up to 5L. Use 2 torr models for fast stripping of DMF.

Programmable Model 2028 enables walk-away control for up to five vacuum / time methods for 2 solvent samples.


  • Automatic self-cleaning purge maintains efficiency, extends diaphragm life
  • Free air displacement: 35 L/min (1.2 CFM)
  • Incremental ballast switch enables fast response to bumping/foaming
  • Inlet and exhaust separators protect pump and lab air from contaminants
  • Select 9 torr model for atmospheric B.P to 120°C; 2 torr model to B.P. 160°C