Rocker 300B Vacuum Filtration System

Overview

The Rocker 300B Vacuum Filtration System is an integrated, laboratory-grade solution engineered for routine and high-throughput microbial testing in compliance with standard methods including ISO 7218, ASTM D5127, and USP <61>. It operates on the principle of vacuum-assisted membrane filtration—drawing liquid samples through a defined-pore-size membrane under controlled negative pressure to retain microorganisms for subsequent enumeration or isolation. The system’s core architecture centers on an oil-free piston vacuum pump delivering stable, pulse-minimized suction (ultimate vacuum ≤ 70 kPa, flow rate ≥ 25 L/min), paired with a chemically resistant VF2 borosilicate glass filtration manifold and SUS316 stainless steel filter funnels. This configuration ensures reproducible filtration kinetics, minimal sample adsorption, and compatibility with aqueous, buffered, and mildly acidic or alkaline solutions commonly encountered in environmental water, food, pharmaceutical, and clinical microbiology workflows.

Key Features

• Patented Twist-Lock Funnel Mechanism (TWI Patent No. M381450): Eliminates clamps and gasket alignment issues—funnels secure in <1.5 seconds with audible tactile feedback, ensuring leak-tight sealing across repeated autoclave cycles.
• SUS316 Stainless Steel Filter Funnels: Fully autoclavable (121°C, 20 min, 15 psi), corrosion-resistant, and compliant with FDA 21 CFR Part 11 requirements for material traceability in regulated environments.
• Oil-Free Piston Pump Architecture: No lubricating oil required—eliminates risk of hydrocarbon contamination, avoids oil mist generation, and removes scheduled oil replacement or coalescer maintenance.
• Electronic Ignition Bunsen Burner (Dragon 100): Flame temperature > 900°C with instant ignition and flame stabilization circuitry—enables rapid, operator-safe sterilization of funnels and forceps between samples without open-gas handling.
• Integrated Inlet Air Filtration: Dual-stage pre-filter (hydrophobic PTFE + activated carbon) protects internal cylinder walls and piston seals from particulate ingress and ambient humidity, extending service life beyond 10,000 operating hours.
• Low-Noise, Low-Vibration Operation: Direct-drive motor coupling and elastomeric vibration dampening reduce operational noise to ≤ 52 dB(A) at 1 m—suitable for shared lab spaces and laminar flow hood integration.

Sample Compatibility & Compliance

The Rocker 300B supports filtration of volumes from 10 mL to 2,000 mL per run, with validated performance for turbid water matrices (e.g., wastewater, seawater, milk suspensions) and viscous biological media (e.g., nutrient broths, tryptic soy broth). All wetted components—including VF2 glass bottles, silicone tubing, and PTFE disc filters—meet USP Class VI biocompatibility standards. The 0.45 µm microbial retention membranes are certified non-pyrogenic and low-binding, with batch-specific sterility validation reports available upon request. System design adheres to ISO 13485 manufacturing controls, and full documentation packages support GLP/GMP audit readiness, including calibration certificates for vacuum gauge verification and pump performance logs.

Software & Data Management

While the Rocker 300B is a manually operated analog system, its modular design enables seamless integration into digital lab workflows. Optional accessories include vacuum pressure loggers (e.g., Rocker VP-DataLink) that record real-time suction profiles and export timestamped CSV files compatible with LIMS platforms. All consumables carry serialized lot numbers traceable to QC test records. The 2-year parts warranty includes documented replacement history and firmware update notifications for future-compatible electronic modules—ensuring long-term data integrity and regulatory continuity.

Applications

• Total viable count (TVC) and colony-forming unit (CFU) enumeration per ISO 4833-1 and APHA Standard Methods 9215.
• Escherichia coli, Enterococcus spp., and coliform detection in drinking water, recreational water, and effluent using membrane filtration followed by selective media incubation.
• Clarification and particulate removal from cell culture supernatants prior to downstream analysis (e.g., ELISA, PCR).
• Pre-filtration of HPLC mobile phases and buffer solutions to prevent column clogging.
• Routine sterilization of heat-labile reagents where autoclaving is unsuitable.

FAQ

Is the Rocker 300B suitable for use in ISO Class 5 cleanrooms?
Yes—the oil-free pump eliminates airborne hydrocarbon emissions, and all components pass particle shedding tests per ISO 14644-1 when operated within specified airflow conditions.
Can the VF2 glass bottle set withstand repeated autoclaving?
Yes—borosilicate 3.3 glass construction complies with DIN ISO 3585 and maintains dimensional stability after ≥ 500 autoclave cycles at 121°C.
What is the recommended maintenance interval for the inlet air filter?
Under typical lab conditions, replace the filter cartridge every 6 months or after 1,000 hours of operation—whichever occurs first—as documented in the included maintenance log sheet.
Does the system meet FDA 21 CFR Part 11 requirements for electronic records?
The base system is analog and exempt; however, when paired with optional VP-DataLink logging hardware and validated software, full Part 11 compliance—including audit trails, electronic signatures, and data integrity controls—is achievable.
Are replacement membranes supplied with endotoxin testing reports?
Yes—each lot of 0.45 µm membranes undergoes independent LAL testing per USP <85>, with CoA reporting endotoxin levels < 0.25 EU/mL.