Harvard Apparatus PumpHarvard Apparatus’ PHD ULTRA CP Syringe Pump is the first of its kind to infuse fluids under constant pressure by automatically adjusting the flowrate. The syringe pump is a good fit for a variety of constant pressure applications including constant pressure microfluidic mixing and introduction of chemical reactants in a controlled manner. The PHD ULTRA CP couples to virtually any commercially available pressure transducer/amplifier with a 0-10V output to deliver fluids with an applied force of up to 1,000 lbs with < +/-2 percent pressure accuracy. All PHD ULTRA CP syringe pumps are infuse/withdraw models and are offered in a variety of configurations and force/pressure ratings. – harvardapparatus.com