Masterflex L/S Precision Integrated Variable-Speed Peristaltic Pump Drive

Overview

The Masterflex L/S Precision Integrated Variable-Speed Peristaltic Pump Drive is an engineered solution for laboratory and industrial fluid handling applications requiring high repeatability, bidirectional flow control, and modular scalability. Based on the fundamental principle of peristaltic pumping—where rollers compress flexible tubing in sequence to generate positive displacement—the L/S drive delivers precise volumetric delivery without fluid contact with mechanical components. This design eliminates contamination risk, ensures consistent shear-sensitive fluid integrity, and supports operation across a wide viscosity range (up to 10,000 cP, depending on tubing selection and pump head configuration). Designed for integration into automated workflows, analytical instrumentation, and regulated environments, the drive complies with general electrical safety standards (IEC 61010-1) and supports documentation traceability via optional NIST-traceable calibration certification (P/N 17050-01). Its robust aluminum housing, sealed electronics, and IP33-rated splash resistance make it suitable for benchtop use in QC labs, bioprocessing development, and chemical synthesis setups where reliability and operational flexibility are critical.

Key Features

• Precision speed control with ±0.25% repeatability—verified at full scale (600 rpm) and low-speed regimes (e.g., ±0.1 rpm at 100 rpm), enabling accurate dosing and titration protocols.
• Bidirectional DC motor with programmable forward/reverse sequencing—essential for tubing cleaning cycles, backflushing, and recirculation loops.
• Modular stack architecture supporting up to four L/S pump heads on a single drive base—enabling dual-, triple-, or quad-channel configurations without additional controllers or power supplies.
• Three-digit LED RPM display provides real-time, operator-readable feedback—critical for GLP-compliant recordkeeping and manual process verification.
• Dual-mode operation: local control via tactile membrane keypad or remote interface options including 4–20 mA analog input, DB9 digital I/O (footswitch P/N 77595-35), and handheld controller (P/N 07528-80) with integrated tube guide for dispensing directly into vessels.
• Universal pump head compatibility—supports nine distinct head types: Standard, Easy-Load®, Easy-Load® II, Easy-Load® 3, Multi-Channel, High-Performance, Cartridge, PTFE-Tubing, and PTFE-Diaphragm—allowing optimization for flow rate, pressure tolerance, chemical resistance, or sterility requirements.

Sample Compatibility & Compliance

The L/S drive accommodates tubing sizes from L/S 13 (1.6 mm ID) through L/S 36 (9.5 mm ID), delivering flow rates from 0.06 mL/min to 3400 mL/min depending on tubing material, wall thickness, and pump head selection. It is compatible with silicone, Viton®, Tygon®, PharMed® BPT, and PTFE-lined tubing—meeting USP Class VI, FDA 21 CFR Part 177, and EU 10/2011 compliance when used with certified materials. While the drive itself does not carry CE or UKCA marking, its electrical design conforms to IEC 61010-1 for measurement/control laboratory equipment. Optional NIST-traceable calibration documentation (P/N 17050-01) satisfies internal audit requirements for ISO/IEC 17025-accredited laboratories and supports validation under GMP Annex 11 and FDA 21 CFR Part 11 when paired with compliant data acquisition systems.

Software & Data Management

The L/S drive operates as a standalone analog/digital peripheral—no proprietary software is required for basic operation. However, its 4–20 mA speed input and DB9 digital interface enable seamless integration with PLCs, SCADA platforms, and LIMS-controlled environments. When connected to a validated data logger or industrial PC running compliant software (e.g., LabVIEW with DAQmx drivers or Siemens TIA Portal), the drive supports audit-trail-enabled operation—including timestamped speed setpoints, direction changes, and run duration logs. Remote start/stop commands and status feedback (e.g., “running,” “paused,” “overload”) can be logged alongside process parameters, fulfilling ALCOA+ data integrity principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Applications

• Pharmaceutical manufacturing: buffer preparation, media dispensing, and continuous chromatography feed control.
• Biotechnology: cell culture perfusion, harvest clarification, and tangential flow filtration (TFF) feed streams.
• Environmental testing: automated sample injection for ICP-MS, IC, and UV-Vis spectrophotometry.
• Food & beverage QA: viscosity-adjusted ingredient metering, pH adjustment loops, and enzymatic reaction quenching.
• Academic research: microfluidic precursor delivery, electrochemical cell feeding, and polymer solution extrusion studies.

FAQ

What pump heads are supported by the L/S drive?

The drive accepts nine interchangeable pump head types: Standard, Easy-Load®, Easy-Load® II, Easy-Load® 3, Multi-Channel, High-Performance, Cartridge, PTFE-Tubing, and PTFE-Diaphragm—each optimized for specific tubing geometries, pressure ratings, and maintenance frequency.
Can multiple L/S drives be synchronized?

Yes—via external 4–20 mA master signal or discrete digital triggers, enabling coordinated multi-pump operations such as gradient mixing or parallel reactor feeding.
Is the drive suitable for cleanroom environments?

While the IP33 rating protects against vertical dripping and limited splashing, it is not rated for ISO Class 5–7 cleanrooms. For such applications, enclosure within a laminar flow hood or integration into a sealed process skid is recommended.
How is speed accuracy verified across the operating range?

Calibration is performed at three points (10%, 50%, and 100% of max speed) using a certified optical tachometer traceable to NIST standards. Repeatability is confirmed over 10 consecutive cycles at each point.
Does the drive support analog speed ramping?

Yes—when configured with a 4–20 mA input, linear ramp profiles (e.g., 0–100% over 30 seconds) can be generated externally via PLC or process controller, enabling gentle startup for shear-thinning fluids.