The chemically resistant PTFE diaphragm vacuum pump impresses with its very silent and economical operation. With a flow rate of 1.8 m3/h and an ultimate vacuum of 5 mbar, it is optimally suited to be combined with the Rotavapor® R-300.



  • Quiet operation thanks to speed regulation
  • Unattended operation in combination with Interface I-300 / I-300 Pro when combined with optional level sensor for secondary condenser that alerts potential overflow of the receiving flask


  • High chemical resistance due to the use of high quality materials
  • Increased lifetime thanks to speed-controlled operation in conjunction with the optional Interface I-300 / I-300 Pro
  • Easy visual detection of condensate and particles due to transparent front panel


  • Seamless plug & play integration into:
    • A speed-controlled vacuum system with Interface I-300 / I-300 Pro
    • A fully automated BUCHI Rotavapor® R-300 system including all process parameters


Seamless Integration

Convenient temperature setting and control when integrated in a Rotavapor® R-300 system.


A set vacuum is achieved very precisely by means of speed-control operation. Due to the absence of sudden pressure changes bumping is minimized.

Visible membranes

Condensed solvents or particles are easily visible thanks to the transparent front panel.

Quiet operation

Thanks to speed-control, the pump operates smoothly to keep the set vacuum. This results in very low noise emission (32 dB).

Secondary condenser

The optional post-pump condenser captures vapor which is otherwise released into the lab atmosphere.

Level sensor

In combination with the Interface I-300 / I-300 Pro an optional sensor alerts the operator to empty the receiving flask when required.

Expert Advice

How can I reduce the noise emission of a vacuum pump?

Flexible mounting

By choosing a speed-controller pump. The Vacuum Pump V-300 / V-710* in conjunction with the Interface I-300 / I-300 Pro are operating only when required. This significantly reduces the noice emission and extends the lifetime of the pump.

*V-710 reqires the LegacyBox for speed-controlled operation.

What is the advantage of the secondary condenser compared to an in-line condenser between pump and distillation unit?

If the solvent is expanded first to ambient pressure, the vapor pressure is increased and thus a condensation much more efficient. This is the reason why the secondary condenser is at the pressure side of the pump. Due to the chemical resistance of the diaphragm pump, even aggressive gases and vapors do not harm the pump.

How do I efficiently use the gas ballast?

The gas ballast is an easy method to adjust leakage air to the pump heads. This addition of inert gas helps to dry the diaphragms in case of condensate and thus increase the pump rate again. Typically, the gas ballast is closed to obtain highest flow rate.

How can I reset the power save mode?

The power save mode mode can be reset by simply switching the pump off and on again.

Is the final vacuum affected by the power save mode?

No, the final vacuum is not affected by the power save mode. It only reduces the speed of the pump which reduces the capacity after 1 hour to 1.6 m3/h and after 2 hour to 1.0 m3/h. 

Why are there some condensate droplets on the diaphragm?

If the distillation parameters are not chosen according to the "delta 20 rule" (10-30-50), the condensation is not complete and vapor is entering into the pump. Due to the high vacuum in the second stage, the vapor may condensate, leading to droplets. Thus, the pressure has to be increased or the cooling temperature of the condensation assembly decreased.

P: 1300 552 003