HKM AutoFilter™ Fully Automatic Membrane Dispenser

Overview

The HKM AutoFilter™ Fully Automatic Membrane Dispenser is an engineered solution for controlled, aseptic handling of sterile, individually packaged microporous filter membranes in regulated microbiological testing environments. Operating on non-contact optical sensing technology, the device eliminates manual membrane separation—removing the need to peel protective backing paper or physically handle membrane surfaces—thereby mitigating tactile contamination risks inherent in conventional manual dispensing. Its core function aligns with standardized membrane filtration methodology as defined in ISO 7218, USP , and EN ISO 11737-1, where reproducible, low-bioburden membrane presentation is critical for colony-forming unit (CFU) enumeration, environmental monitoring, and sterility testing. The dispenser integrates seamlessly with multi-unit stainless steel filter holders (e.g., 4-, 6-, or 8-place manifolds), enabling rapid, sequential membrane loading without operator repositioning or glove contact with membrane edges.

Key Features

• Optical proximity sensor activation: Hands-free membrane ejection triggered by hand presence within 5 cm—no physical button contact required, minimizing surface contamination and supporting ALARA (As Low As Reasonably Achievable) hygiene principles.
• Real-time usage tracking: Onboard counter logs total dispensed membranes and displays remaining count via integrated OLED interface—supporting inventory control, audit readiness, and GLP-compliant record retention when paired with lab information management systems (LIMS).
• Portable battery-powered operation: Rechargeable lithium-ion battery delivers 6,000–12,000 cycles per charge (tested with standard 47 mm diameter, 0.45 µm pore size cellulose ester membranes); eliminates dependency on fixed power outlets during laminar flow hood or isolator-based workflows.
• Electropolished 304 stainless steel enclosure: Non-porous, corrosion-resistant housing withstands repeated exposure to 70% ethanol, hydrogen peroxide vapor (HPV), and quaternary ammonium disinfectants—validated for routine decontamination between batches in ISO Class 5–7 environments.
• Precision membrane indexing system: Integrated capacitive positioning sensor ensures consistent 1-mm vertical alignment of each membrane edge upon ejection, facilitating reliable retrieval with sterile forceps and reducing membrane skew or wrinkling during transfer to filtration units.

Sample Compatibility & Compliance

The HKM AutoFilter™ accepts standard sterile, individually foil-laminated filter membranes in diameters of 47 mm and 50 mm, including mixed-cellulose ester (MCE), polyethersulfone (PES), and nylon variants with pore sizes ranging from 0.1 µm to 0.8 µm. It is validated for use with membranes conforming to ASTM D2974 (for microbial recovery efficiency) and ISO 8573-7 (compressed air purity testing). While not itself a certified medical device, its design supports compliance with FDA 21 CFR Part 11 requirements when used in conjunction with electronic log systems that enforce user authentication, audit trails, and data integrity controls. The unit meets CE marking requirements for electrical safety (EN 61000-6-3, EN 61000-6-1) and carries RoHS 2.0 and REACH declarations.

Software & Data Management

The dispenser operates via embedded firmware (v2.3+) with no external PC dependency. Usage data—including date-stamped dispense events, cumulative counts, and low-battery alerts—is stored locally in non-volatile memory and exportable via micro-USB (CSV format) for integration into LIMS or electronic lab notebooks (ELN). Optional firmware update capability enables future enhancements such as Bluetooth LE connectivity for remote status polling and time-synchronized batch logging—designed to support GMP Annex 1 digital traceability expectations for aseptic process equipment.

Applications

• Pharmaceutical water system monitoring (PW, WFI, pure steam condensate)
• Bioburden testing of raw materials, excipients, and final drug product solutions
• Environmental monitoring in cleanrooms and isolators (surface and air sampling filters)
• Food & beverage pathogen screening (e.g., coliforms, Pseudomonas spp., yeast/mold)
• Medical device sterility assurance (ISO 11737-2 compliant filtration setups)
• Academic and contract research laboratories requiring high-throughput, auditable membrane handling

FAQ

Does the HKM AutoFilter™ require calibration?
No. The optical and capacitive sensors are factory-aligned and do not require periodic recalibration under normal operating conditions. A functional verification test (FVT) protocol is provided in the user manual for daily startup checks.
Can it accommodate non-standard membrane packaging formats?
Only foil-laminated, flat, rectangular pouches with uniform thickness (0.3–0.6 mm) and a minimum leading-edge gap of 2 mm are supported. Custom spool-fed or roll-based configurations are not compatible.
Is the battery replaceable by the end user?
Yes—the Li-ion module is field-replaceable using standard Torx T8 tools and requires no soldering. Replacement kits (P/N: HKM-BAT-REPL-150) include pre-programmed battery management circuitry.
What maintenance is required?
Monthly cleaning of the optical sensor window with lint-free swab and isopropyl alcohol; quarterly inspection of the membrane feed path for particulate accumulation using supplied borescope adapter.
Does it support integration with SCADA or MES platforms?
Native Modbus RTU over RS-485 is available as an optional hardware add-on (HKM-MBUS-KIT), enabling direct readout of dispense count, battery voltage, and error codes into industrial automation systems.