Evaporators & Accessories
Laboratory evaporators are used to concentrate solutions or samples for analysis and are available in two formats. Rotary evaporators, or rotavaps, work by rotating a solution that is placed in a heated bath. A vacuum removes the evaporated fluid, which is cooled to return it to a liquid for analyzing or further processing. While rotations speed can be controlled in analog models, digital models include timers and provide greater precision and control of variables including the bath temperature, rotation speed, and rotation direction. Safety features on some models include low-water alarms, temperature monitoring to prevent overheating, and explosion ratings.
While a rotary evaporator works by heating and rotating one solution at a time, a centrifugal evaporator uses a vacuum and centrifuge chamber to process multiple solutions simultaneously. They are used to concentrate solutions and biological samples in laboratory and research applications. A vacuum pump lowers the boiling point of samples, enabling delicate samples to be concentrated without heating them to high temperatures. Because most centrifugal models incorporate a vacuum into the base, they require less benchtop space than rotary models.
Evaporator accessories supplement an existing evaporator by extending capacity or replacing worn out or lost parts. Rotary models use specialized glassware that wears with repeated use and should be monitored and replaced to ensure a safe operating environment. Other accessories for rotary models include clamps, vial connectors, and graduated cylinders. Additional rotors or rotors that hold different sample sizes can be used with centrifugal models to extend capacity and speed processing.
Features to consider when selecting a laboratory evaporator include the number of samples that will processed at one time, sample volume, whether or not the sample is sensitive to heat, footprint and available space, access to a vacuum, safety features, variable precision, temperature range, and power supply and source.