AX-65 Diffusion Pump

The AX-65 diffusion pump is a high-performance, air-cooled pump designed with bench-top analytical instruments in mind. Its vertical finned boiler and high power provide stable pumping and high helium pumping speed. This pump can be ordered with a cold cap or a dense baffle. The pump includes a fluid-level sight glass that indicates the fluid level at all times.

Product details Related Product


  • High performance specifications means higher, cleaner vacuum levels
  • Fluid-level sight glass provides quick indication of pump fluid status at all times
  • The wide range of available pump configuration and flange combinations optimizes pump performance and fit for your application
  • Compact design makes integration into space-limited equipment easy
  • Full thermal protection guards against all over-temperature conditions
  • “Pump-ready” thermal switch sends a signal when pump is operational
  • Finned, vertical boiler promotes stable pumping, especially of light gases
  • Three-stage fractionating jet with ejector stage purifies pumping fluid, giving higher forepressure tolerance


Pumping Speed, Operating Range 65 l/sec Air, 90 l/s He and H2
Maximum Throughput 0.19T-l/s (0.25 mbar-l/s) in operating range 0.30T-l/s (0.40 mbar-l/s) @ 0.01 torr
Compression Ratio 4 x 107 (Air), 2 x 106 (helium)
Operating Range 3 x 10-3 to <5 x 10-8 torr (3.9 x 10-3 to 6.5 x 10-8 mbar)
Maximum Forepressure No load: 0.75 torr (1.00 mbar) Full Load: 0.60 torr (0.78 mbar)
Backstreaming Rate With cold cap: <2 x 10-4 mg/cm2/min With baffle: <2 x 10-5 mg/cm+/min
Recommended Backing Pump ≥1.5 cfm (2.5 m3/hr)
Warmup Time 7 minutes
Cooldown Time 10 minutes
Fluid Charge 30 cc
Electrical Requirements 1 ph, 50/60 Hz, 90/115/165/220 VAC
Pump Power 200/250 watts
Air Cooling 30 cfm



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