Jiapeng DHL-B Dual-Channel Digital Constant Flow Peristaltic Pump

Overview

The Jiapeng DHL-B is a dual-channel digital constant flow peristaltic pump engineered for precise, repeatable fluid delivery in laboratory chromatography, fraction collection, and continuous sampling applications. It operates on the principle of positive displacement via roller compression of flexible tubing—eliminating fluid contact with internal pump components and ensuring chemical compatibility, sterility, and low maintenance. Designed for integration into modular liquid-phase separation systems, the DHL-B synchronizes seamlessly with UV/visible detectors, fraction collectors, and data acquisition units. Its microprocessor-based control architecture enables stable flow output across the full range without drift, making it suitable for gradient elution support, buffer delivery in FPLC workflows, and long-duration perfusion experiments requiring high reproducibility.

Key Features

• Dual independent channels with simultaneous, programmable flow control—each channel adjustable from 0.5 to 900 mL/h in 0.1 mL/h increments
• Backlit blue membrane LCD display with intuitive Chinese interface (software-localized for lab personnel in bilingual environments), showing real-time flow rate, elapsed time, remaining volume, and operational mode
• Integrated flow calibration function: users input measured actual flow against setpoint to generate correction factors applied automatically across the entire range
• Bidirectional rotation capability supports both forward and reverse pumping—essential for system priming, backflushing, and reagent recovery
• High-torque microstepping stepper motor drive ensures smooth, pulse-free operation with minimal vibration and acoustic noise (<45 dB at 1 m)
• Ergonomic 80° tilted control panel facilitates visual monitoring and tactile operation without stooping—aligned with ISO 9241-210 human-centered design principles
• Robust ABS housing formed via single-shot injection molding provides mechanical stability, chemical resistance to common solvents (e.g., ethanol, acetone, aqueous buffers), and ESD-safe operation
• Standard TTL-level external control interface (IN/OUT) enables hardware synchronization with fraction collectors (e.g., Jiapeng BS series) or PC-based automation via RS232 optional module

Sample Compatibility & Compliance

The DHL-B accommodates standard peristaltic tubing sizes Ø1.2×3 mm and 3×5 mm—compatible with Tygon®, PharMed® BPT, and silicone formulations meeting USP Class VI and FDA 21 CFR 177.2600 requirements. While not certified for GMP manufacturing environments, its design supports GLP-compliant documentation workflows: all timing, volume, and calibration events are locally recorded and can be manually logged for audit trails. The pump meets IEC 61010-1:2010 safety standards for laboratory electrical equipment, including dielectric strength testing and protection against electric shock. It is routinely deployed in academic research labs, QC/QA departments, and pilot-scale purification setups where traceability, repeatability, and tubing longevity are prioritized over regulatory certification.

Software & Data Management

The DHL-B operates as a standalone instrument with embedded firmware—no proprietary software installation required. All parameters (flow rate, run/sleep timers, dispensing volume, calibration offsets) are stored in non-volatile memory and retained after power cycling. For advanced integration, an optional RS232 communication module (sold separately) allows ASCII command protocol interaction with LabVIEW, Python (PySerial), or custom SCADA platforms. Timestamped operation logs—including start/stop events, calibration entries, and error codes (e.g., “Tubing Jam”, “Motor Overload”)—can be exported manually via serial dump. The system does not implement FDA 21 CFR Part 11 electronic signature or audit trail features natively; however, third-party data capture solutions may be deployed upstream to satisfy regulated documentation requirements.

Applications

• Paired with nucleic acid/protein detectors and fraction collectors to construct complete low-pressure liquid chromatography (LPLC) systems for biomolecule purification
• Controlled buffer delivery in affinity, ion-exchange, and size-exclusion chromatography methods per ASTM D4294 and ISO 13877 protocols
• Automated media exchange in cell culture perfusion bioreactors and microfluidic platform priming
• Calibrated sample introduction in environmental water analysis (e.g., EPA Method 300.0 for anion detection)
• Quantitative reagent dosing in titration-assisted assays and kinetic enzyme studies (e.g., coupled NADH oxidation assays)
• Continuous extraction workflows in natural product isolation, including Soxhlet-style percolation support

FAQ

What tubing sizes are supported by the DHL-B pump head?
The DHL-B accepts two standard inner/outer diameter configurations: Ø1.2 mm × 3 mm and 3 mm × 5 mm—optimized for compatibility with common laboratory-grade peristaltic tubing.
Can the DHL-B operate in gradient flow mode across both channels?
No—the DHL-B delivers constant flow per channel; it does not support real-time programmable flow ramping or gradient generation. For gradient applications, external controller integration or sequential manual programming is required.
Is calibration traceable to national standards?
Calibration is user-performed using gravimetric or volumetric measurement; no NIST-traceable certificate is supplied. Users may validate accuracy against ISO 8655-3 calibrated syringes or certified flow meters.
Does the pump include overload protection?
Yes—integrated current sensing triggers automatic shutdown if motor torque exceeds safe thresholds, preventing damage during tubing occlusion or excessive backpressure.
What is the maximum continuous operating temperature for connected tubing?
The pump body remains within ambient temperature limits (5–40 °C); tubing thermal limits depend on material selection—consult manufacturer datasheets for Tygon® LFL (up to 60 °C) or PharMed® BPT (up to 135 °C).