RV-5A Rotary Evaporator — 5L with PID Temperature Control and Auto Lift for Chemical and Pharma Labs

The RV-5A's PID (Proportional–Integral–Derivative) temperature controller is the central performance advantage of this model over basic thermostat-controlled rotary evaporators. The PID algorithm continuously monitors bath temperature against the setpoint and modulates heating power to maintain ±1°C stability — preventing the temperature oscillations that cause variable evaporation rates and inconsistent results in thermostatically controlled systems. For pharmaceutical and chemical processing applications where evaporation temperature directly affects product purity, recovery yield, and sample integrity, PID temperature control is the standard of precision required.

The RV-5A provides rotation speed from 20 to 140 rpm — a range calibrated for the 5L rotary flask format where the optimal thin-film formation speed is lower than for smaller 1–2L flasks due to the greater mass and moment of inertia of the larger rotating assembly. The 20 rpm minimum supports very gentle rotation for viscous samples, heat-sensitive materials, and solvents prone to bumping, while the 140 rpm maximum enables efficient thin-film formation and evaporation rate for standard low-viscosity solvents at appropriate bath temperatures.

The RV-5A's LCD display provides clear, real-time readout of bath temperature (actual and setpoint) and rotation speed throughout the evaporation process — allowing operators to monitor process parameters and identify deviations without interrupting the evaporation cycle. The LCD display is positioned for visibility at standing bench height and provides the parameter clarity required for operating the RV-5A in accordance with pharmaceutical and chemical processing SOPs that specify monitoring and documentation of evaporation conditions.

The RV-5A's automatic lift mechanism provides motorised, controlled raising and lowering of the rotary flask through a 150 mm lifting range — allowing precise, reproducible positioning of the flask relative to the heating bath surface. The 150 mm lifting distance provides sufficient clearance to fully raise the 5L rotary flask above the bath for flask attachment, removal, and inspection without manual lifting, and to rapidly retract the flask from the bath in response to alarm conditions or process completion — protecting samples from over-heating during post-evaporation handling.

The RV-5A employs a dual-material sealing system combining PTFE seals at the rotary joint and Teflon coating throughout the vacuum path and bath interior — providing comprehensive chemical resistance across the full range of solvents and chemical reagents processed in pharmaceutical and chemical laboratory rotary evaporation. PTFE's near-universal chemical inertness prevents seal degradation from aggressive solvents including halogenated compounds, strong acids, and aromatic solvents, maintaining the vacuum integrity of the 8 mbar system across thousands of evaporation cycles.

Despite its 5L processing capacity, the RV-5A maintains a compact laboratory footprint at 860 × 410 × 1120 mm — making it suitable for standard laboratory bench or stand installation without requiring dedicated floor space. The compact design allows the RV-5A to be positioned alongside other laboratory equipment in chemical synthesis, pharmaceutical QC, and research laboratory workstations, and facilitates relocation within the laboratory when experimental layout requires adjustment.