Tech Tip 7: Rotary Pump Maintenance | Oil changes & use of the Ballast Valve

Tech Tip 7: Rotary Pump Maintenance | Oil changes & use of the Ballast Valve

Most GC-MS vacuum systems comprise of a two-stage pumping arrangement – an initial low-vacuum, high capacity stage consisting of a rotary oil pump or diaphragm pump; and a second high stage, low capacity vacuum pump such as a diffusion or turbo-molecular pump. The first stage or low-vacuum pump requires maintenance to ensure optimum pumping performance. Two aspects that are often overlooked are the use of the ballast valve on the vacuum pump and replacement of the pump oil at the correct intervals.

Dr Karen Steward

Dr Diane Turner talks about her career to Dr Karen Steward, Senior Science Writer for Technology Networks as part of a collection of interviews with female scientists, in celebration of International Day of Women and Girls in Science 2021. Download the ebook from the Technology Networks website.