Masterflex L/S Peristaltic Pump (No Display, Model 77910-25)

Overview

The Masterflex L/S Peristaltic Pump (Model 77910-25) is a precision-engineered, industrial-grade peristaltic pump designed for continuous, contamination-free fluid transfer in analytical laboratories, bioprocessing workflows, and quality control environments. Operating on the principle of positive displacement via occlusion—where rollers compress flexible tubing against a curved housing—the pump delivers repeatable volumetric flow without exposing the fluid path to valves, seals, or moving parts within the liquid stream. This design ensures inherent chemical compatibility, eliminates cross-contamination risk, and supports sterile or shear-sensitive applications such as cell culture media delivery, buffer preparation, and reagent dosing. The 77910-25 configuration integrates the base L/S drive unit (Model 07554-95) with the Easy-Load II® pump head (77200-62), optimized for rapid tube loading and high-flow operation across tubing sizes #15, #24, #35, and #36—enabling flow rates from 56 to 1700 mL/min at speeds up to 600 rpm.

Key Features

• Reversible 1/20 HP motor with soft-start and back-EMF feedback for stable speed regulation and extended motor life
• Manual speed adjustment via calibrated thumbwheel; green LED power indicator remains active regardless of drive engagement state
• Powder-coated steel enclosure rated IP22—providing protection against vertically dripping water and solid objects ≥12.5 mm
• Compliance with global safety standards: UL/cUL Listed (115 VAC), CE-marked (230 VAC), and certified to ISO 9001:2000 for consistent manufacturing quality
• Modular architecture supporting eight interchangeable pump head types—including Easy-Load II® for tool-free tube replacement and PTFE-diaphragm variants for ultra-pure or aggressive chemical handling
• Scalable flow capacity: dual-head configurations enabled via mechanical synchronization, supporting parallel processing or Y-branch manifold integration

Sample Compatibility & Compliance

The L/S platform accommodates a broad range of chemically resistant tubing materials—including Tygon® LFL (low extractables), PharMed® BPT (USP Class VI compliant), and Norprene® (FDA-listed elastomer)—ensuring compatibility with aqueous, organic, acidic, and mildly caustic solutions. Tubing wall thicknesses up to 2.4 mm support higher suction lift and improved performance with viscous or particulate-laden fluids. The system meets requirements for GLP and GMP-aligned workflows where traceability and process consistency are critical: full documentation of pump head/tubing pairing, validated flow profiles per tubing ID/OD/wall specification, and adherence to ASTM D3948 (fluid handling equipment qualification) and USP (analytical instrument qualification). No internal wetted surfaces require cleaning validation, reducing operational downtime and verification burden.

Software & Data Management

This analog-driven model operates without embedded firmware or digital interfaces—intentionally engineered for robustness, electromagnetic immunity, and long-term reliability in electromagnetically noisy or regulated lab environments. While it lacks USB or RS-232 connectivity, its consistent ±5% speed accuracy and mechanical repeatability enable integration into externally controlled systems via 0–10 VDC analog input (optional accessory) or dry-contact start/stop signals. For audit-ready operations, users maintain calibration logs referencing tubing lot numbers, pump head wear cycles, and flow verification data per ISO/IEC 17025 clause 5.5. All Masterflex pump heads include serialized identification plates compatible with laboratory asset management systems.

Applications

• Continuous feed of mobile phases in HPLC and IC systems requiring pulse-free, low-shear delivery
• Media and feedstock transfer in single-use bioreactors and perfusion culture platforms
• Automated titration and reagent addition in ICP-MS and AA sample introduction loops
• Environmental sampling—peristaltic pumping of groundwater, wastewater, or soil leachates through inline filters
• Pharmaceutical QC labs performing dissolution testing per USP , where flow consistency directly impacts release profile fidelity
• Chemical synthesis reactors requiring inert, metered addition of catalysts or monomers under nitrogen blanket

FAQ

Can this pump be used in a cleanroom environment?
Yes—when paired with USP Class VI-certified tubing (e.g., PharMed® BPT) and operated with appropriate filtration, the L/S drive meets ISO 14644-1 Class 7 requirements for particle generation.
What is the maximum allowable suction lift for #24 Tygon LFL tubing?
At 600 rpm and ambient temperature, the tested dry suction lift is 2.1 m (7 ft) with #24 tubing; performance decreases linearly above 40 cP viscosity.
Is the Easy-Load II® pump head autoclavable?
No—the pump head housing is not rated for steam sterilization; however, it supports gamma irradiation (25–50 kGy) when specified with compatible elastomers.
How often should tubing be replaced under continuous operation?
Typical service life for Tygon LFL #24 tubing at 300 rpm is 1,200–1,800 hours; replacement intervals must be verified via flow rate drift monitoring per your SOP.
Does the drive support external speed modulation?
Yes—via optional analog speed control module (Masterflex Part No. 77910-01), accepting 0–10 VDC input with 0.1 V resolution and full 0–600 rpm range mapping.