With flow rate 0.01–100 ml/min and limit of pressure 30Mpa(0.01-50ml/min)/15 MPa(0.1-100ml/min) is this pump suited for preparative applications in liquid chromatography. It is designed with two pump heads connected in parallel with  piston diameter of 3/8”. Quite new concept of electronic controlling, pump drive, shape of cams and pressure transducer expand its functions and improve its reliability against  previous type LCD 4020.7. Intuitive operating using simple keypad allow  easy chose functions as follow: - flow rate - maximal flow rate- PURGE ( for priming and washing) - low pressure limit - high pressure limit - pulsation compensation on-off - pressure unit (PSI, MPa or bar) - control mode ( by keypad, RS232 or using voltage) - display brightness Two LED displays allows to watch (also from a distance) adjusted flow rate and operating pressure. By pump function choosing, give you this displays enough of information for adjusting. There is possibility to use this pump by high pressure gradient mode, where are two, tree or four unit controlled  from PC using  RS232 or  voltage. By work with buffered solvents is possible to use pistons back washing.