2-Channel Bidirectional Push-Pull Pump
Dual-channel syringe pump with bidirectional push-pull operation, supporting syringes from 10 μL to 140 mL with flow rates from 0.831 nL/min to 150.5 mL/min for precise microfluidic control.
Louise Corscadden, PhD
Neuroscience · ConductScience
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The 2-Channel Bidirectional Push-Pull Pump delivers precise microfluidic control for laboratory applications requiring simultaneous infusion and withdrawal operations. This dual-channel system accommodates syringes from 10 μL to 140 mL with flow rates spanning 0.831 nL/min to 150.5 mL/min, providing exceptional dynamic range for diverse experimental protocols.
The bidirectional push-pull capability enables complex fluidic operations including perfusion, sampling, reagent delivery, and waste removal within a single integrated platform. Digital knob control with membrane interface ensures precise flow adjustment, while RS-485 communication enables remote operation and integration with automated experimental systems.
How It Works
The pump operates through precision stepper motor-driven lead screws that control syringe plunger movement with nanoliter-level accuracy. Each channel functions independently, allowing simultaneous push (infusion) and pull (withdrawal) operations or coordinated bidirectional flow control. The stepper motor resolution determines the minimum step volume based on syringe diameter, enabling flow rates from sub-nanoliter per minute to over 150 mL/min.
Digital control algorithms translate user-defined flow rates into precise motor step sequences, accounting for syringe geometry and fluid properties. The RS-485 interface enables remote programming and real-time flow rate adjustments, supporting complex experimental protocols requiring dynamic flow control.
The push-pull mechanism creates positive and negative pressure differentials across microfluidic systems, enabling applications such as perfusion, dialysis, and continuous sampling that require simultaneous fluid addition and removal.
Features & Benefits
Channels
- 2
Syringe Range
- 10 uL - 140 mL
Flow Rate
- 0.831 nL/min - 150.5 mL/min
Features
- Bidirectional push-pull
Interface
- Digital knob + membrane, RS-485
Automation Level
- semi-automated
Brand
- ConductScience
Research Domain
- Analytical Chemistry
- Cell Biology
- Environmental Monitoring
- Materials Science
- Microfluidics
- Pharmaceutical QC
Weight
- 4.3 kg
Dimensions
- L: 280.0 mm
- W: 250.0 mm
- H: 140.0 mm
| Feature | This Product | Typical Alternative | Advantage |
|---|---|---|---|
| Channel Count | 2 independent channels | Single channel systems are common in entry-level models | Enables simultaneous infusion and withdrawal for perfusion experiments without equipment switching |
| Flow Rate Range | 0.831 nL/min to 150.5 mL/min | Basic pumps often cover 3-4 orders of magnitude | Six orders of magnitude range eliminates need for multiple pumps across different experimental scales |
| Syringe Compatibility | 10 μL to 140 mL syringes | Limited syringe size ranges in specialized models | Wide compatibility reduces inventory requirements and enables protocol flexibility |
| Bidirectional Operation | Push-pull capability on both channels | Many systems offer infusion-only operation | Supports complex fluidic operations including dialysis and continuous sampling protocols |
| Control Interface | Digital knob + membrane with RS-485 | Basic models may have limited digital interfaces | Combines intuitive local control with automated system integration capability |
| Form Factor | 280 × 250 × 140 mm, 4.3 kg | Dual-channel systems can be significantly larger | Compact design maximizes bench space efficiency while maintaining full dual-channel functionality |
This pump combines dual-channel independence with bidirectional operation and exceptional flow rate range in a compact platform. The integration of digital and RS-485 control enables both manual and automated operation modes for diverse experimental requirements.
Practical Tips
Verify flow rates gravimetrically at your operating conditions, especially at flow rates below 1 μL/min where environmental factors affect accuracy.
Why: Actual flow rates can vary from settings due to fluid properties, tubing compliance, and back-pressure effects.
Replace syringes and tubing regularly, especially when switching between different fluid types or after biological experiments.
Why: Contamination and seal degradation can compromise accuracy and introduce artifacts in sensitive experiments.
Prime the system thoroughly and purge air bubbles before starting experiments, particularly at low flow rates where bubbles significantly affect delivery.
Why: Air bubbles cause flow irregularities and can completely block flow at ultra-low flow rates.
If flow appears irregular, check for leaks at all connections and verify syringe mounting alignment with drive mechanisms.
Why: Leaks and misalignment cause pressure drops and irregular plunger movement that affect flow stability.
Allow the system to stabilize for several minutes at your target flow rate before beginning critical measurements or sample collection.
Why: Flow stabilization time increases at lower flow rates due to system compliance and fluid inertia effects.
Use appropriate pressure relief or overflow protection when working with closed systems or viscous fluids that may cause pressure buildup.
Why: Blocked outlets or high viscosity fluids can generate dangerous pressures that may cause tubing failure or sample contamination.
Select syringe sizes appropriate for your target flow rates - use smaller syringes for low flow rates and larger syringes for high flow rates.
Why: Optimal syringe selection maximizes resolution at low flows and minimizes refill frequency at high flows.
Account for tubing compliance and dead volume when calculating actual sample delivery times and volumes in your experimental protocols.
Why: System compliance introduces delays between flow initiation and sample delivery that become significant in time-critical experiments.
Setup Guide
What’s in the Box
- 2-Channel Push-Pull Pump Unit
- Power Adapter
- RS-485 Communication Cable (typical)
- Syringe Mounting Hardware
- User Manual and Software
- Calibration Certificate (typical)
Warranty
ConductScience provides a standard 1-year manufacturer warranty covering defects in materials and workmanship, with technical support for setup and operation.
Compliance
What determines the minimum achievable flow rate with different syringe sizes?
Minimum flow rate depends on stepper motor resolution and syringe cross-sectional area. Smaller diameter syringes achieve lower flow rates due to reduced volume per step, with 10 μL syringes enabling the specified 0.831 nL/min minimum.
Can both channels operate simultaneously at different flow rates?
Yes, each channel operates independently with separate motor control, allowing simultaneous push-pull operations at different flow rates, directions, and timing profiles.
What fluid compatibility should I consider for long-term experiments?
Syringe and tubing materials determine fluid compatibility. Consult product datasheet for specific wetted materials. Consider chemical compatibility, especially with organic solvents or corrosive solutions.
How do I integrate this pump with automated experimental systems?
Use the RS-485 interface for computer control and protocol automation. The digital communication enables real-time flow rate changes and status monitoring for integration with experimental control software.
What accuracy can I expect across the flow rate range?
Accuracy varies with flow rate and syringe size. Highest accuracy occurs at mid-range flow rates with appropriate syringe selection. Consult product datasheet for specific accuracy specifications at your operating conditions.
How do I minimize pulsation in microfluidic applications?
Use larger diameter syringes for smoother flow delivery, add pulse dampeners in the fluid path, and select flow rates well within the pump's stable operating range. Avoid very low flow rates where stepper resolution becomes limiting.
What maintenance is required for reliable operation?
Regular syringe and tubing replacement prevents contamination and maintains accuracy. Clean wetted surfaces after each use, especially with biological or reactive samples. Periodic calibration verification ensures continued accuracy.
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