| Vacuum/Suction Lift Data MASTERFLEX pumps offer great vacuum/suction lift. To achieve maximum lift, choose your tubing size and material carefully. The lower the ID to wall ratio, the better the vacuum performance. The stiffer the wall material, the better the vacuum level. In general, NORPRENE®/PHARMED® materials enable you to generate the highest level of vacuum before collapsing, and give you the longest life in a fluidless application; adjustable occlusion pump heads generate the best level of vacuum. The graph and table below are easy to use to determine the speed required to achieve the vacuum level required. All of the MASTERFLEX L/S® and I/P® vacuum tests were conducted with the Standard pump head with the stainless steel rotor (except for sizes L/S® 25, L/S® 35, L/S® 36, and I/P® 26). The rated vacuum was generated after running for two minutes.  | Vacuum/Suction Lift  Vacuum/suction lift capability depends greatly on the tubing’s ability to maintain its shape. Thus, a firmer tubing type in the smallest possible bore size will generate a stronger vacuum for your application. Higher drive speeds are required to generate the strongest possible vacuum with some tubing sizes. Example one
To generate a 13" Hg vacuum (almost 50%) using L/S® 13 silicone tubing, the motor speed must be at least 5 rpm. The pump system will generate the vacuum in about 30 to 60 seconds, depending on the length of the tubing system that needs to be evacuated. Example two
To develop a suction lift of 8.8 m (29 ft) H20 with L/S® 15 NORPRENE tubing, the motor speed needs to be at least 50 rpm. At 50 rpm it will take approximately 2-3 minutes to prime the pump. |