Aijiren Series - HPLC Binary Pump. Cambridge ID #: 20402. Specifications: Hydraulic system: Two dual piston in series pumps with proprietary servo-controlled variable stroke drive, floating piston design and active inlet valve. Setable flow range: Setpoints 0.001 - 5 ml/min, in 0.001 ml/min increments. Flow range 1 - 5.0 ml/min.