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Welch™ Gem™ Vacuum Pumps and Systems

Designed for rotary evaporations with high boiling point solvents

Manufacturer: welch™  8890A70

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Catalog No. 01-129-1

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Description & Specifications


Horsepower 0.25hp
Voltage 115V
Hertz 60Hz
Height (English) 8.4 in.
Height (Metric) 21.3cm
Width (English) 5.1 in.
Length (English) 14.5 in.
Length (Metric) 36.8cm
Shipping Weight (English) 26 lb.
Shipping Weight (Metric) 11.8kg
Includes Tubing, gauge, Model 1421 vacuum regulator, 1416B exhaust mist eliminator, plus the GEM pump to connect to a rotary evaporator
Motor Speed 3450rpm
Pressure 0.1 torr
Certifications/Compliance CSA
Flow Rate 31L/min.
For Use With (Equipment) Rotary evaporator
Electrical Requirements 115V 60Hz
For Tube Size (English) 0.39 in.
For Tube Size (Metric) 1cm
Noise Level 50dBA
Weight (English) 24.5 lb.
Weight (Metric) 11.1kg

Rugged gear pumping mechanism operates over a wide range of pressures. Efficiently pumps vapors without condensing them into the pump.

  • Effective evaporation for DMSO and other high boiling point solvents
  • Adjustable vacuum to prevent bumping
  • Gear pump mechanism is tolerant of vapors
  • Exhaust mist eliminator prevents oil loss
  • Free air displacement: 31L/min. (1.1cfm)
  • Ultimate vacuum: 0.1 torr
  • Oil capacity: 0.5 qt. (0.45L)
  • Accepts tubing: 10mm I.D.