The Back Pressure Regulator (BPR) is state–of–the–art in back pressure control for supercritical fluids. By manipulating the pressure and temperature, CO2 can selectively extract the desired material. The sample is placed in an extraction vessel and pressurized with CO2 and a small percentage of co-solvent to extract the compound of interest.
The back pressure regulator consists of a motor–driven heated valve assembly controlled by a microcontroller. The heated valve assembly compensates for cooling that occurs during depressurization and eliminates plugging. The high–strength stainless steel needle and reinforced PEEK seat have a high resistance to erosion and allow stable pressure control over a wide pressure range. A built–in pressure sensor provides closed loop feedback for pressure control. The back pressure regulator can easily be programmed using a hand held controller for stand–alone operation, or by using an RS232 port with software for advanced control features.