Welch reports that its new programmable 2 Torr self-cleaning dry vacuum system is ideal for use with rotary evaporators, concentrators and gel dryers. The intelligent, self-cleaning design provides a fully integrated vacuum pump and controller. It incorporates a numeric keypad and electronic variable control valve for precise and repeatable vacuum control with programmable dual set points, timer, memory, repeat and anti-bumping functions.
The corrosion resistant PTFE (oil-free) diaphragm pump features a distinctive self-cleaning purge that automatically runs for two minutes at shutdown to rid the pump of residue when the process is finished. This ensures longer diaphragm service life and reduced downtime by cleaning the pump at the correct time.
This dry vacuum system is ideal for use with rotary evaporators for stripping high-boiling-point solvents or for stripping low boiling point solvents when using the integrated vacuum controller. The system has a patent-pending two-stage, flexible diaphragm pump that resists chemical vapours thanks to fluorinated plastics used on all wetted surfaces, including the diaphragm itself.
This pump is oil-free yet delivers a vacuum to 2 Torr with a free air displacement of 35 l/min. The fully integrated vacuum controller can store up to five program settings to allow hand free operation. There are also several added protective features, including a glass inlet separator that helps prevent the pump from ingesting liquids or particulates, and an exhaust separator that collects any liquid droplets or particulates flushed from the pump during the purge cycle. An adjustable vacuum control knob, numeric key pad and up/down arrows ensure precise vacuum control.
A feature especially useful when pumping low-boiling point solvents to minimize foaming or bumping within a flask is the one touch bumping/anti-foaming button.
