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Automatic Membrane Dispenser

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0102030405

Automatic Membrane Dispenser

2026-03-27

Basic Definition & Purpose

An Automatic Membrane Dispenser (also called automatic membrane picker/membrane distributor) is a special laboratory device designed forsterile, contact-free, and automatic membrane distribution. Its core value lies in preventing contamination, improving testing efficiency, and standardizing experimental operations.
It is mainly used in microbial detection (membrane filtration method) to automatically peel and deliver individually packaged sterile membranes, with zero manual contact throughout the process to greatly reduce contamination risks. The device is commonly used with multi-branch stainless steel filtration systems/membrane Filters for quantitative microbial detection of water quality, food, beverages, pharmaceuticals, cosmetics, and environmental samples.

Core Working Principle

  1. Feeding: Load continuous roll-type sterile membranes (150–40,000 pieces per roll, depending on specifications)
  2. Triggering: Activated via infrared/optical sensor (contact-free), foot pedal, or button control
  3. Peeling: Motor-driven rollers automatically separate the membrane from two layers of protective paper (paper + plastic film)
  4. Discharging: A single membrane is accurately delivered to the picking position for easy tweezer collection
  5. Waste Recycling: Automatically collects discarded packaging paper to keep the laboratory bench tidy

Key Components & Structure

  • Sensor: Infrared/optical sensor for contact-free triggering
  • Driving System: Precision motor + rollers, controlling membrane discharge speed and positioning
  • Peeling Mechanism: Automatically separates the membrane from protective layers
  • Counting Module: Displays used/remaining membrane quantity for convenient inventory management
  • Housing: Mostly made of 304 stainless steel/aluminum alloy, corrosion-resistant and easy to disinfect
  • Power Supply: DC 12V/AC 220V, built-in lithium battery (long battery life for thousands to tens of thousands of membrane discharges)

Core Advantages

  • Sterile & Anti-contamination: Zero manual contact throughout the process, eliminating human-induced contamination, compliant with GMP/GLP standards
  • High Efficiency: Membrane discharge time < 1 second per piece, suitable for high-throughput testing
  • User-friendly Operation: Supports contact-free sensing, foot pedal and button control, freeing up hands for experimental operations
  • Stable & Reliable: Precise positioning and smooth discharge, reducing consumable waste
  • Easy Cleaning & Maintenance: Stainless steel material allows direct wiping with disinfectants
  • Portable: Compact size and light weight; some models support wireless/battery-powered mobile use

Mainstream Brands & Models

  • Merck Millipore: EZ‑Pak Dispenser Curve, Sentino
  • Sartorius: 16713 series and related automatic membrane pickers
  • AELAB: Automatic Membrane Dispenser
  • Huankai Biology: Automatic Membrane Dispenser
  • Cobetter: MD01AU
  • Membrane Solutions: MS® Automatic Membrane Dispenser

Commonly Compatible Membrane Specifications

  • Diameter: 47mm, 50mm (most widely used)
  • Materials: MCE (Mixed Cellulose Ester), NC (Nitrocellulose), PES, PVDF, etc.
  • Packaging: Continuous roll-type individually sterile packaging (gamma-ray sterilized)

Selection Criteria

  1. Discharge Speed: Prioritize models with discharge time < 1 second per piece for high-throughput needs
  2. Trigger Mode: Infrared sensing (recommended) with foot pedal/button control as backup
  3. Capacity: Single roll membrane quantity (starting from 150 pieces) to reduce roll replacement frequency
  4. Power Supply: Wired power supply + built-in battery for flexible movement
  5. Material: 304 stainless steel housing for easy cleaning and disinfection
  6. Compatibility: Compatible with mainstream brand membrane rolls (Millipore, Sartorius, etc.)

Typical Application Fields

  • Food & Beverage: Drinking water, beer, wine, dairy products, soft drink testing
  • Pharmaceutical & Cosmetic: Pharmaceuticals, cosmetics, water for injection, biological product testing
  • Environmental Monitoring: Surface water, sewage, airborne microbial sampling and testing
  • CDC & Commodity Inspection: Epidemic prevention, quality supervision, entry-exit inspection
  • Scientific Research: Microbiology laboratories, university research, third-party testing institutions

Operation & Maintenance Notes

  • Installation: Load the membrane roll according to the instruction manual and ensure accurate positioning
  • Operation: Trigger the device by placing hands/feet near the sensor; use tweezers to pick membranes (do not touch the dispenser interior)
  • Cleaning: Wipe the surface with 75% alcohol or special disinfectant after experiments
  • Maintenance: Regularly clean rollers and take-up shafts, and check sensor sensitivity
  • Storage: Store in a clean, dry environment at room temperature (10–40℃)