Description:

The 11 Plus updates Harvard’s venerable constant-flow architecture with a micro-step drive and non-volatile memory that remembers syringe size, rate and direction after power loss. Two syringes from 0.5 µL to 10 mL mount side-by-side, or a single barrel up to 60 mL; step resolution of 0.00008 in (2 µm) delivers pulse-free flows down to 0.0014 µL h⁻¹ for microfluidics or up to 1 593 mL h⁻¹ for column packing. The vacuum-fluorescent display guides setup in plain English units, and dual RS-232 ports allow remote scripting from LabVIEW. A universal 100–250 V power module and 4.5 lb aluminum chassis mean the pump travels easily between glove boxes and incubators. Front-panel micro-dial selects one of 27 motor force settings—max force 16 kg—for viscous gels without stripping leadscrews.

Economic Advantage:

Open syringe holders accept any manufacturer’s glass or plastic barrels, sparing labs from proprietary disposables. Built-in universal power eliminates transformer bricks, and the 0.5 % accuracy meets GLP without annual factory recalibration—saving roughly $700 per instrument over five years.