Masterflex L/S High-Pressure Peristaltic Pump Model 77914-20

Overview

The Masterflex L/S High-Pressure Peristaltic Pump Model 77914-20 is an industrial-grade, precision-engineered peristaltic pumping system designed for demanding laboratory and pilot-scale applications requiring reliable, contamination-free fluid transfer under elevated backpressure. Operating on the principle of positive displacement via roller compression of elastomeric tubing, this pump eliminates direct contact between the fluid and mechanical components—ensuring zero risk of cross-contamination, valve clogging, or seal degradation. Its robust brushless DC motor and advanced speed regulation circuitry deliver stable, repeatable flow across its full operational range (0.9–240 mL/min), with continuous pressure capability up to 125 psi (8.6 bar)—making it suitable for high-resistance filtration, inline chemical dosing, solvent delivery in HPLC sample introduction, and sterile bioprocess fluid handling where integrity and traceability are critical.

Key Features

• High-pressure capability: Rated for continuous operation at up to 125 psi (8.6 bar) with compatible L/S-series high-pressure tubing (e.g., PharMed® BPT L/S 16HP or Norprene® L/S 16HP)
• Precision speed control: Digital LED display with keypad interface enables accurate setting and real-time monitoring of rotational speed (1–100 rpm) and direction; speed repeatability maintained within ±0.25% (±1 rpm)
• Soft-start motor drive: Reduces mechanical stress during startup and minimizes torque ripple, extending pump head and tubing service life while improving flow stability
• Bi-directional operation: Reversible motor allows flexible integration into recirculation loops, purge cycles, or bidirectional calibration protocols
• Modular L/S pump head architecture: Supports single-head configuration with standardized mounting; pump head may be installed vertically or laterally to accommodate space-constrained or manifold-integrated setups
• IP33-rated enclosure: Splash-resistant, flame-retardant housing meets UL 50E requirements for laboratory and light industrial environments
• No-wear fluid path: Entire wetted surface consists solely of certified pharmaceutical-grade tubing—no valves, diaphragms, gears, or seals require cleaning, replacement, or validation

Sample Compatibility & Compliance

The Model 77914-20 is compatible with a broad selection of FDA-compliant, USP Class VI-certified peristaltic tubing—including PharMed® BPT and Norprene® formulations—each validated for specific pressure, temperature, and chemical resistance profiles. Tubing selection directly determines maximum flow rate, pressure rating, and compatibility with aggressive solvents, acids, bases, or biological media. The system supports GLP/GMP-aligned workflows through consistent, documented performance: speed accuracy and repeatability meet ASTM D3418 standards for rotational instrument calibration, and optional audit-trail-capable software integration (via RS-232 or analog 0–10 V output) facilitates compliance with FDA 21 CFR Part 11 requirements when paired with validated data acquisition platforms.

Software & Data Management

While the 77914-20 operates as a standalone unit with intuitive front-panel controls, it includes industry-standard communication interfaces for seamless integration into automated lab systems. An RS-232 serial port enables remote speed command, direction control, and status feedback (e.g., run/stop, fault codes) using ASCII protocol. Analog 0–10 V input/output supports external PID loop integration—for example, linking pump speed to real-time pressure or flow sensor feedback in closed-loop dosing applications. When deployed with compliant LIMS or ELN platforms, operational logs—including runtime, total revolutions, and speed setpoints—can be archived with time-stamped metadata, supporting traceability and deviation investigation per ISO/IEC 17025 and ICH Q7 guidelines.

Applications

• Chemical metering and reagent dispensing in analytical instrumentation (e.g., ICP-MS sample introduction, titration systems)
• High-backpressure filtration processes, including tangential flow filtration (TFF) and sterile venting of bioreactor exhaust lines
• Pharmaceutical formulation development: excipient slurry transfer, buffer exchange, and fill-finish line priming
• Environmental testing: continuous eluent delivery in ion chromatography or sequential extraction protocols
• Food & beverage QA/QC: viscosity-sensitive product transfer, flavor concentrate dosing, and microbial sampling loops
• Academic research: microfluidic interface priming, electrochemical cell perfusion, and controlled polymer solution extrusion

FAQ

What tubing types are recommended for continuous operation at 125 psi?
PharMed® BPT L/S 16HP (1/8″ ID) and Norprene® L/S 16HP are validated for 125 psi continuous pressure; always confirm compatibility with your specific fluid chemistry using Masterflex’s Chemical Resistance Guide.
Can multiple 77914-20 units be synchronized for parallel pumping?
Yes—using external TTL or analog synchronization signals via the RS-232 interface or 0–10 V input, up to four units can maintain phase-aligned speed and direction for balanced multi-stream delivery.
Is the pump suitable for sterile applications?
When used with gamma-sterilizable tubing (e.g., PharMed® BPT) and aseptically installed, the system supports ISO 13408-1 compliant processes; however, the driver enclosure itself is not rated for autoclave or SIP exposure.
How often should tubing be replaced under continuous operation?
Lifespan varies by speed, pressure, and fluid abrasivity; typical service life for L/S 16HP tubing at 50 rpm and 60 psi is 200–400 hours—monitor for visible flattening, cracking, or flow deviation exceeding ±3% to determine replacement timing.
Does the system include tubing clamps for high-pressure stabilization?
The standard configuration does not include tube clamps; however, Masterflex part #06832-02 (100/pack) is recommended for securing tubing at inlet/outlet ports when operating above 80 psi to prevent disengagement under pulsation load.