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The RV-20A Rotary Evaporator is engineered for medium-to-large scale solvent evaporation in chemical, pharmaceutical, and industrial laboratory environments where batch volume, processing throughput, and structural robustness must match the demands of pilot-scale and high-volume production-adjacent operations. With a 20L rotary flask, 10L collection bottle, 7 L/h maximum evaporation rate, and a 1.29 m² condenser area — the largest in the mid-range RV Series — the RV-20A delivers serious processing capacity backed by PID temperature precision (±1°C), 8 mbar ultimate vacuum, and an aluminum alloy bracket providing the structural strength required to support the greater mechanical loads of 20L-scale glassware and solvent volumes. Enquire about the RV-20A today.
The RV-20A Rotary Evaporator delivers 20L-scale solvent evaporation with a 7 L/h throughput, PID temperature control, 1.29 m² condenser, aluminum alloy structural support, and comprehensive PTFE/Teflon sealing — providing the processing capacity, precision, and durability required for pilot-scale chemical, pharmaceutical, and industrial laboratory applications.
The RV-20A's 20L rotary flask capacity — four times that of the RV-5A — enables processing of significantly larger batch volumes in a single evaporation run, reducing the number of batch cycles required to process a given total solvent volume and increasing overall laboratory throughput. The 10L collection bottle provides proportionally large recovered solvent storage, accommodating extended evaporation runs without requiring intermediate collection bottle emptying. For pilot-scale chemical and pharmaceutical processing operations, the 20L batch capacity represents a meaningful step toward production-scale efficiency.
The RV-20A's rotation system maintains stable orbital motion from 20 to 130 rpm with the increased mechanical precision required to drive a 20L rotary flask assembly — where the greater mass and moment of inertia demand a more powerful and rigidly supported drive mechanism than smaller 5L units. Stable, vibration-free rotation at this scale is essential for consistent thin-film formation across the full inner surface of the large-format rotary flask, ensuring uniform heat transfer and evaporation rate throughout the 20L evaporation cycle.
The RV-20A's LCD display provides continuous real-time visibility of bath temperature, rotation speed, and operational status throughout the evaporation process. In a 20L-scale processing operation where a single batch may represent significant material value and processing time, continuous process parameter monitoring via the LCD display allows operators to verify that temperature, vacuum, and rotation conditions are maintained within the specified process parameters — supporting batch documentation and quality management requirements in pharmaceutical and chemical processing environments.
The RV-20A employs PTFE seals at the rotary joint and Teflon coating throughout the vacuum path and bath interior — providing the same chemical resistance standard as the RV-5A, extended to the 20L-scale system's greater vacuum contact surface area. At 20L scale, vacuum seal integrity is particularly critical: even minor seal degradation can result in significant vacuum loss that proportionally reduces the evaporation rate, extends batch processing time, and potentially causes incomplete solvent recovery from large-volume pharmaceutical or chemical batches.
The RV-20A is built on an aluminum alloy bracket — a structural advancement over simple steel frame designs that provides the rigidity, vibration damping, and load-bearing capacity required to safely support a fully loaded 20L rotary flask, condenser assembly, and collection bottle system at the heights required for effective rotary evaporation. The aluminum alloy construction combines high strength with corrosion resistance and reduced overall unit weight compared to steel equivalents — important practical considerations for laboratory installation and repositioning.
The RV-20A Rotary Evaporator incorporates four independent safety systems scaled for 20L pilot-scale operation — providing critical protection against over-current, over-temperature, power interruption, and anti-dry conditions during high-value, large-volume pharmaceutical and chemical solvent processing.
At 4300W rated power, the RV-20A is a high-demand electrical load requiring robust over-current protection. The over-current protection circuit continuously monitors current draw across the heating and motor systems and disconnects power if current exceeds safe operating limits — protecting heating elements, motor drive components, and laboratory electrical infrastructure from damage caused by wiring faults, component failures, or power supply irregularities. For a 20L-scale instrument processing large and potentially high-value chemical or pharmaceutical batches, preventing electrical damage through robust over-current protection is an important instrument longevity and operational continuity measure.
The RV-20A's independent over-temperature protection system monitors water bath temperature and automatically cuts heating power if the temperature exceeds the safe upper limit — independently of the primary PID controller. At 20L batch scale in pharmaceutical and chemical processing, an over-temperature event risks thermal degradation of large volumes of high-value material and generates significantly greater quantities of solvent vapour than a smaller-scale unit — making independent thermal protection a critical safety requirement rather than a supplementary feature.
The RV-20A automatically restores its pre-interruption temperature setpoint and rotation speed when power supply is restored following a mains interruption. At 20L pilot scale, where a single batch may represent hours of processing time and significant material value, having to restart an interrupted evaporation from a default state — rather than resuming from the interrupted setpoint — could mean discarding a partially processed batch or running an extended restart protocol. The power interruption protection eliminates this disruption, maintaining batch integrity and processing continuity across unplanned power events.
The RV-20A's anti-dry protection monitors bath water level and activates protective shutdown if the level falls below the safe minimum. At 20L scale, the larger water bath (Ø445 × 250 mm, 4300W heating power) presents a greater anti-dry risk than smaller units — higher power input accelerates water evaporation during long processing sessions, and the greater heating capacity means that dry bath conditions develop more rapidly and with more damaging consequences. The anti-dry protection system prevents bath damage and heating element failure during extended pilot-scale processing operations.
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