Each piston/cylinder assembly is mounted on a ceramic plate which slides from the inlet port where the cylinder fills to the outlet port where it delivers.
Each piston is at a different point in the fill/deliver cycle at any given time. One connecting rod drives two pistons simultaneously. While one cylinder is filling, the opposing cylinder is delivering.
In 4-cylinder models (shown here), flow pulsation is reduced compared to single-piston pumps because at least one cylinder is always dispensing (see Figure 2 at right).
Encynova's standard multiple-channel manifold is used to interconnect all of the inlets and all of the outlets - so each pump has just one main inlet and one main outlet.
Digitally-controlled
Encynova's high-end pumps (Nova Systems) are equipped with servo motors which
accept 8-bit ASCII commands. Digital control of liquid delivery ensures the
exceptional repeatability and precision required for automated processes and
development applications. Nova Systems control the metering flow rate with
the speed (rpm) of the motor, and they measure delivery volume through crankshaft
rotation.
User calibration is not required because flow rate and dispense volume are
not adjusted by physical re-orientation of parts (as is the case with many
other pump technologies).
Nova Technology (Nova System Modules)
Nova Technology provides enhanced performance for precision liquid control. Nova technology is standard in all Nova Systems, which are comprised of any 4-cylinder pump head with a servo motor. Two software algorithms, NovaSpense™ and NovaFlow™, are used by the Nova System's servo motor to more precisely control liquid delivery. NovaSpense™ dramatically increases accuracy for dispensing, and NovaFlow provides nearly-pulseless delivery during continuous-flow metering. Nova capabilities are available with the servo motor option for four-piston OEM System Modules (2-4 and 16-4) and are standard features in the Base Station and Satellite units.
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Technology-
Encynova's hybrid piston-syringe pumps master a wide variety of liquid delivery tasks. Discrete-volume DISPENSING and continuous-flow METERING functions are performed easily and accurately with the same pump.
When Accuracy and Durability Combine...
The Encynova design is an internally-sealed, valveless pump technology which integrates the durability of a piston pump with the accuracy of a syringe pump. Now you can move, measure, and control liquid with one compact module. Versatile control options enable fast, effective integration into your system. Excellent repeatability and millions of cycles of piston life provide reliable performance for OEM applications.
A single, offset crank drives precision pistons inside one, two, or four liquid cylinders. As the pistons move fluid in and out of the cylinders, the cylinders slide from side to side, from inlet port to outlet port. The internally-sealed flow path eliminates the need for external valves. User calibration is not necessary. Operating as a continuous-drive, multiple-syringe device, the Encynova System automatically refills and empties each cylinder in succession.