DHL-A Dual-Channel Digital Flow-Control Peristaltic Pump

Overview

The DHL-A Dual-Channel Digital Flow-Control Peristaltic Pump is a microprocessor-controlled laboratory peristaltic pump engineered for precise, repeatable fluid delivery in low-to-medium pressure applications. Based on the fundamental principle of peristalsis—where rollers compress flexible tubing to generate positive displacement—the DHL-A delivers consistent volumetric flow without fluid contact with pump mechanics, ensuring contamination-free operation and compatibility with aggressive, viscous, or particulate-laden solutions. Designed for benchtop integration in analytical chemistry, bioprocessing, environmental sampling, and teaching laboratories, the DHL-A operates across a broad speed-adjustable range, enabling accurate metering from microliter-per-minute to milliliter-per-hour scales. Its dual-channel architecture supports parallel or independent flow control, facilitating comparative experiments, reagent addition to multiple reactors, or continuous feed-and-collect configurations.

Key Features

• Dual independent pumping channels with synchronized or asynchronous operation modes
• High-resolution digital LED display showing real-time rotational speed (rpm) and cumulative dispensed volume (mL)
• Wide flow adjustment range: 0.6–900 mL/h per channel, achieved via stepless digital speed control
• Integrated non-volatile memory retains last-used settings—including flow rate, timer, and calibration offset—after power cycling
• Robust mechanical design with corrosion-resistant housing and precision-machined roller assemblies for long-term stability
• Maximum occlusion pressure ≥3 kg/cm² (294 kPa), suitable for use with standard silicone or Tygon® tubing (ID 0.5–3.2 mm)
• Calibration correction function (±1–300 ‰) to compensate for tubing elasticity, wear, or fluid viscosity effects

Sample Compatibility & Compliance

The DHL-A is compatible with a wide range of chemically resistant pump tubing materials—including platinum-cured silicone, Viton®, Norprene®, and Pharmed®—enabling safe handling of organic solvents, acids, bases, and biological buffers. No wetted parts other than the tubing ensure full fluid isolation and eliminate cross-contamination risks between runs. While not certified to IEC 61000-6-3 (EMC) or UL/CSA safety standards out-of-the-box, the unit complies with general laboratory equipment electromagnetic compatibility guidelines for typical academic and industrial lab environments. Its design supports GLP-aligned workflows through traceable parameter logging (when interfaced externally) and reproducible manual operation validated per ISO 8573-1 for clean air–assisted applications.

Software & Data Management

The DHL-A operates as a standalone instrument with embedded firmware; no PC connection is required for basic operation. All parameters—including flow rate, total volume, and calibration offset—are set and monitored directly via front-panel membrane keys and the integrated LED display. For advanced integration, optional RS-232 or TTL-level serial output (available upon request) enables communication with LabVIEW™, Python-based automation scripts, or custom SCADA systems. When used in regulated environments, users may implement external audit trails via timestamped log files generated by host software—supporting alignment with FDA 21 CFR Part 11 requirements where electronic records are employed. The built-in memory ensures parameter persistence without reliance on external storage.

Applications

• Continuous feeding of mobile phase solvents in preparative HPLC or ion chromatography systems
• Controlled nutrient or inducer delivery in microbial fermentation and bioreactor studies
• Automated sample introduction into atomic absorption spectrometers (AAS) or ICP-OES instruments
• Parallel dialysis or ultrafiltration setups requiring matched flow rates across two streams
• Teaching labs demonstrating fluid dynamics, pump calibration, and volumetric accuracy principles
• Environmental field sampling—e.g., timed water extraction from lysimeters or sediment traps

FAQ

What tubing sizes are recommended for optimal performance with the DHL-A?
Standard tubing inner diameters from 0.5 mm to 3.2 mm are supported; silicone tubing ID 1.6 mm (e.g., Cole-Parmer Masterflex L/S-16) delivers best balance of flow linearity and pressure capability within the specified range.
Can the DHL-A be operated in continuous mode without volume limiting?
Yes—volume dispensing can be disabled to enable indefinite continuous operation at a fixed speed setting.
Is the DHL-A suitable for sterile applications?
When paired with gamma-sterilizable tubing (e.g., C-Flex® or PharMed® BPT) and operated under aseptic conditions, it meets basic requirements for closed-system sterile transfer in non-GMP research settings.
Does the pump support analog or digital external triggering?
The base model does not include trigger inputs; however, custom firmware variants with TTL start/stop and pulse-output signals are available under OEM agreement.
How often should tubing be replaced to maintain flow accuracy?
Under typical use (8 h/day, aqueous buffer), silicone tubing should be replaced every 100–200 operating hours; frequency increases with solvent exposure or elevated pressure—calibration correction helps compensate for gradual compliance loss.