LongerPump DG Series Micro-Volume Multi-Channel Peristaltic Pump Head

Overview

The LongerPump DG Series Micro-Volume Multi-Channel Peristaltic Pump Head is a precision-engineered fluid handling component designed for laboratory and industrial applications requiring accurate, contamination-free, multi-stream peristaltic delivery at low to moderate flow rates. Based on the fundamental principle of peristalsis—where rotating rollers compress flexible tubing to generate positive displacement—the DG series delivers pulse-dampened, non-invasive fluid transfer without valves, seals, or internal wetted surfaces. Its modular card-based architecture enables rapid tube loading and secure retention while maintaining consistent occlusion geometry across multiple parallel channels. The pump head is not a standalone motorized unit but a drop-in replacement or add-on component compatible with standard peristaltic drive systems featuring NEMA 17/23 mounting interfaces and adjustable speed controllers (typically 0–100 rpm). It serves as a critical interface between drive mechanics and fluid path integrity in analytical instrumentation, bioprocessing skids, microfluidic sampling manifolds, and automated reagent dispensing platforms.

Key Features

• Modular card-based design with toggle-lever actuation (DG-1 and DG-2 models) for one-handed, tool-free tube insertion and ejection
• Ratchet-adjustable occlusion gap ensures precise compression control across tubing wall thicknesses from 0.8 mm to 1.0 mm—critical for reproducible flow calibration and extended tube life
• Two roller configurations: 6-roller for higher per-channel flow capacity (up to 48 mL/min), and 10-roller for reduced pulsation amplitude and improved flow continuity—enabling application-specific selection based on fluid rheology and system sensitivity
• Corrosion-resistant 316 stainless steel rollers provide long-term stability in contact with acidic, alkaline, and organic solvent-laden fluids
• Chemically inert housing materials: Polyoxymethylene (POM) for general-purpose use; Polyvinylidene fluoride (PVDF) variants available for aggressive chemical environments (e.g., concentrated halogenated solvents or oxidizing agents)
• Scalable channel count from 1 to 12 (DG-1 through DG-12), supporting parallel processing in HPLC gradient mixing, cell culture media distribution, or multi-analyte sample introduction

Sample Compatibility & Compliance

The DG series accommodates silicone, Viton®, Tygon® LFL, and PharMed® BPT tubing with inner diameters up to 3.17 mm (1/8″), conforming to ISO 594-1 and USP Class VI specifications where applicable. Its occlusion geometry and roller surface finish are optimized to minimize tube fatigue and particle generation—essential for GLP-compliant sampling and low-particulate pharmaceutical fluid handling. While the pump head itself carries no CE or UL certification, its material composition and mechanical design support integration into systems compliant with ISO 13485 (medical device manufacturing), FDA 21 CFR Part 11 (when paired with audit-trail-capable drive controllers), and IEC 61000-6-2/6-3 (EMC immunity/emission requirements for lab equipment).

Software & Data Management

As a passive mechanical component, the DG pump head does not incorporate embedded electronics or firmware. However, it is fully interoperable with industry-standard peristaltic drive systems offering RS-485, Modbus RTU, or analog 0–10 V control inputs. When integrated with programmable drives (e.g., LongerPump BT100-2J or third-party OEM controllers), it supports synchronized multi-channel flow programming, ramped speed profiles, and event-triggered dispensing sequences. Audit trails, calibration logs, and operational history are maintained at the drive controller level—ensuring traceability required under GMP Annex 11 and ISO/IEC 17025 accreditation frameworks.

Applications

• Multi-stream reagent delivery in automated immunoassay and ELISA platforms
• Parallel perfusion of microphysiological systems (MPS) and organ-on-chip devices
• Gradient solvent blending in preparative HPLC and LC-MS sample introduction manifolds
• Continuous feeding of pH/ION standards in online process analyzers
• Low-shear cell suspension transport in bioreactor inoculation and harvest loops
• Calibration fluid distribution in environmental monitoring sensor networks

FAQ

Is the DG series compatible with non-LongerPump drive units?
Yes—provided the drive features standardized mounting holes (NEMA 17/23), adjustable roller pressure, and speed control within 0–100 rpm range.
What tubing materials are validated for use with DG pump heads?
Silicone (PharMed® 5025, Norprene® A-60-F), fluoropolymer-lined tubing (Viton®/EPDM composite), and USP Class VI-certified thermoplastic elastomers have demonstrated optimal service life and flow consistency.
How does the ratchet adjustment affect flow accuracy over time?
The micrometer-style ratchet mechanism maintains occlusion repeatability within ±0.02 mm across >10,000 actuation cycles—supporting stable flow calibration for ≥6 months under continuous operation.
Can DG-12 be operated with only 6 active channels?
Yes—unused channels remain mechanically inert; flow distribution remains linear and independent per active channel due to isolated roller trains.
Are PVDF cards supplied with all DG models by default?
No—POM is standard; PVDF cards (P/N 04011010002) are optional and must be specified at order entry for chemically demanding applications.