{"product_id":"knf-neuberger-vacuum-pump-pj21985-sr920","title":"KNF Neuberger Vacuum Pump PJ21985-SR920","description":"\u003ch3\u003eKNF Neuberger N 920 G Diaphragm Vacuum Pump – 21 L\/min, 2 mbar, Speed-Controlled\u003c\/h3\u003e\n\u003cp\u003eThe KNF Neuberger PJ21985-SR920 is a high-performance, oil-free diaphragm pump engineered for demanding laboratory applications such as rotary evaporation, centrifugal concentration, and distillation. Featuring a chemically resistant design with PPS pump heads, PTFE-coated diaphragms, and FFPM valves, this pump is optimized for the safe handling of aggressive solvent vapors and corrosive gases. With an ultimate vacuum of 2 mbar and a peak flow rate of 21 L\/min, this pump provides the high suction capacity needed at low absolute pressures to ensure rapid and efficient solvent recovery.\u003c\/p\u003e\n\u003ch3\u003eTechnical Performance and Design\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eHigh Pumping Speed at Low Vacuum:\u003c\/b\u003e Specifically engineered to maintain high suction performance throughout the entire vacuum range, significantly reducing process times for high-boiling-point solvents like DMF or DMSO.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eIntegrated Speed Control:\u003c\/b\u003e The built-in potentiometer allows for precise, stepless adjustment of the motor speed, providing the flexibility to tune the vacuum level for delicate or heat-sensitive samples.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eChemically Resistant Flow Path:\u003c\/b\u003e Constructed with high-durability PPS heads and PTFE-coated diaphragms, ensuring the pump remains protected against degradation from acidic, basic, or organic vapors.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eWhisper-Quiet Operation:\u003c\/b\u003e Optimized for the benchtop environment, the pump operates with exceptionally low noise and vibration, contributing to a more ergonomic and focused laboratory setting.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eModel Number:\u003c\/b\u003e PJ21985-SR920\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eFlow Rate (Max):\u003c\/b\u003e 21 L\/min (1.26 m³\/h)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eUltimate Vacuum (Max):\u003c\/b\u003e 2 mbar abs. (approx. 1.5 Torr)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eWetted Materials:\u003c\/b\u003e PPS (Head), PTFE-coated (Diaphragm), FFPM (Valves)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eGas Ballast:\u003c\/b\u003e Integrated valve for clearing condensate from the pump heads\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eVoltage:\u003c\/b\u003e 100–240 V (Universal Power Supply)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eWeight:\u003c\/b\u003e approx. 9.5 kg (21 lbs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Benefits \u0026amp; Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eRotary Evaporation:\u003c\/b\u003e The 2 mbar ultimate vacuum and high flow rate make it the ideal companion for large-scale rotary evaporators, even when working with solvents that have high boiling points.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eCentrifugal Concentration:\u003c\/b\u003e Provides the stable vacuum levels required for high-speed solvent removal in vacuum concentrators without the maintenance burden of oil-sealed pumps.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eMaintenance-Free Life:\u003c\/b\u003e The dry-running diaphragm design eliminates the need for oil changes and disposal, while the brushless motor ensures a long service life and high reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cb\u003eVersatile Process Control:\u003c\/b\u003e The integrated gas ballast allows the pump to handle high-moisture loads by preventing internal condensation, maintaining vacuum efficiency throughout long-running distillations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUsed, in great condition; with 30 day warranty. See video \u003ca href=\"https:\/\/youtube.com\/shorts\/-s64SRNDeeA\"\u003ehere\u003c\/a\u003e.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp style=\"margin: 0; font-size: 0.8em;\"\u003e\u003ci\u003eAll product names, logos, and brands are property of their respective owners.\u003c\/i\u003e\u003c\/p\u003e\n\u003c!----\u003e","brand":"KNF Neuberger","offers":[{"title":"Default Title","offer_id":45217849213180,"sku":"806A","price":900.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0627\/8463\/5132\/files\/knf-neuberger-vacuum-pump-pj21985-sr920-other-automation-knf-neuberger-969142.jpg?v=1778437166","url":"https:\/\/lifesciencestrading.com\/products\/knf-neuberger-vacuum-pump-pj21985-sr920","provider":"Life Sciences Trading","version":"1.0","type":"link"}