The Semis model from Sero combines in a unique manner the advantages of the side channel pump, which is today the prefered technology for liquid gas applications, with the features and benefits of the canned motor. As a result it is absolutely leak-free and maintenance-free which means: service friendliness, long life and functional safety. The low NPSH requirements (NPSHr) allow for optimal exploitation of the specific enthalpy as provided with the corresponding refrigerant.
Another design feature of the refrigerant pump is its ability to reliably handle gas entrainments up to 50 % vol which means increased operational safety even with alternating process conditions. The very compact pump units deliver high differential pressures (up to 23 bar at density 1 g/cm³) at low flows and they are the ideal choice for all currently used organic refrigerants (hydrocarbons R-11, R-22, R-134a or R-410A) as well as for inorganic refrigerants (Ammonia or CO2) and also for lithium bromide solutions or silicone oils.