Dual-Syringe Pump

What is the Dual-Syringe Pump?

A dual-syringe pump drives two syringes at independently controlled rates for mixing, gradient formation and recirculation. It is often used in microfluidics, flow chemistry and perfusion where two separate streams must be coordinated.

Overview

The dual-syringe pump places two independently driven syringes on one chassis, allowing different flow rates, directions and profiles per channel. Each channel has its own lead screw and motor, so one syringe can infuse while the other withdraws, enabling continuous recirculation or pulsatile mixing. Typical flow ranges match the single-syringe pump per channel, from sub-microliter per minute to tens of milliliters per minute. Programming supports gradients, where the ratio between channels changes over time, and alternating cycles for droplet generation and perfusion. Some models allow the two syringes to feed a common mixing tee or a Y-connector, which is common in flow chemistry and microfluidic studies of reaction kinetics. The pump can usually run both channels from one program or from independent programs, with synchronized start and stop.

How does it work?

A syringe pump holds a syringe in a clamp and advances the plunger with a lead screw turned by a stepper motor. Flow rate equals the plunger cross-sectional area multiplied by the linear speed, so a small syringe gives a very low flow and a large syringe gives a higher flow at the same motor speed. Because the drive is positive displacement and continuous, flow is smooth and independent of back pressure until the motor stalls, which makes these pumps valuable for microfluidics, chromatography and infusion. Typical components are the drive mechanism, syringe clamp, control electronics and often a pressure sensor or valve. Pumps range from microliter syringes delivering nanoliters per minute to large syringes delivering hundreds of milliliters per minute, and multi-syringe configurations add parallel or mixing functions.

What are the key features?

• Two independently driven syringes on one chassis
• Per-channel flow rate, direction and profile
• Supports gradients and alternating cycles
• Synchronized start and stop across channels
• Feed to a common mixing tee or Y-connector
• Per-channel accuracy of about 1 %

What are the technical specifications?

A typical dual-syringe pump configuration offers number of channels of 2, flow range per channel of 0.1 µL/h–50 mL/min, syringe sizes of 0.5 µL–60 mL, flow accuracy of ± 1 % after calibration, modes of Infuse, withdraw, gradient, pulse and synchronization of Start, stop and alarm. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Dual-Syringe Pump is used in microfluidic mixing and reaction, flow chemistry with two reagents, gradient formation, recirculating perfusion systems and droplet generation. Across the wider Syringe Pumps class, laboratories also deploy it for microfluidic and lab-on-chip flow control, continuous reagent and nutrient infusion and chromatography sample injection.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 60601-2-24, IEC 61326-1, ISO 9001 and GB 4793.1. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Prime the syringe and line to remove air, because bubbles compress and introduce flow error. Keep the line short and rigid to minimize compliance, which otherwise delays response and lowers accuracy at high pressure. Note the syringe size and manufacturer, since bore tolerances affect delivered volume, and recalibrate whenever the syringe type changes. Do not exceed the pressure rating of the syringe or the drive, and use a pressure sensor or stall detection on restricted systems. Avoid leaving highly viscous or crystallizing fluids in the syringe, and clean the plunger and seal regularly. Follow IEC 61010-1 for electrical safety. For regulated infusion, verify flow gravimetrically and record calibration data, since the pump is often a critical control in the method.

How do I select the right Dual-Syringe Pump?

Choose the dual-syringe pump when two streams must be coordinated, such as reagent mixing or gradient generation. For three or more streams use a multi-channel pump, and for a single stream a single-syringe model is more economical. In the RFQ, state per-channel flow and synchronization needs.

How does it compare with other Syringe Pumps variants?

Start with the required flow rate and syringe size, then choose the drive resolution and speed range that covers it. For nanoliter to microliter flows, a microfluidic pump with a small syringe gives the best stability. For high pressure, choose refractory or stainless steel syringes and a reinforced drive, and note the maximum pressure and any valves needed. Decide how many syringes must run at once: dual and multi-channel pumps allow parallel infusion and mixing. Check whether the pump supports programmable profiles such as ramps, pulses and refill cycles, and whether it can be controlled by software or external signals for integration. Verify wetted materials for chemical compatibility and choose the syringe type, since glass, plastic and steel each have limits. Calibration and flow verification complete the selection.