Primarily utilized for the transfer of small materials across cleanrooms of varying cleanliness levels or between cleanrooms and non-cleanrooms, a comprehensive understanding of its structural components and operational features is essential for optimal utilization.

1. Dynamic Pass Box Structure

Comprising five integral components - Casing, DOP dust port, differential pressure gauge, DOP sampling port, control panel, and double-layer glass door - the dynamic pass box is meticulously designed to ensure effective and secure material transfer.

dynamic pass box structure
Dynamic Pass Box Structure

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2. Outstanding Features

  • Self-Cleaning Function: The pass box incorporates a self-cleaning mechanism, where a fan draws air through a HEPA filter to purify the internal environment during item transfer.
  • Electronic Interlocking System: The doors employ an electronic interlocking system, ensuring that when one door is open, the other is automatically locked, preventing unauthorized access.
  • Ultraviolet Disinfection Lamps: Equipped with UV lamps for disinfecting items that may not be effectively disinfected by conventional means.

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3. Working Principle

The dynamic pass box functions through a process involving a HEPA filter, a fan, and a return air grille. The air circulation is meticulously managed to maintain a purified environment around the conveyed items.

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4. Design Requirements

  • Cleanliness Requirements: Complies with Class B cleanliness standards.
  • Seamless Design: The casing and chamber are seamlessly designed for optimal cleanliness.
  • Laminar Airflow: Utilizes a laminar airflow design with vertical air movement.
  • Filter Specifications: Utilizes G4 pre-filter and HEPA filter H13 or H14.
  • Control System: Equipped with an on/off button, electronic interlock door button, and UV light switch.
design dynamic pass box
Dynamic Pass Box Design

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5. Material Requirements

  • Surface Material: Stainless steel plate (304) with a minimum thickness of 1.5mm for both inner and outer surfaces.
  • Frame Material: 304 stainless steel frame with a minimum thickness of 1.2mm.
  • Glass Material: Tempered glass with a thickness greater than or equal to 8mm.
  • Hepa Filter Frame: Aluminum alloy for strength and shape.
Pass Box Material
Pass Box Usually use SUS 304

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6. Dynamic Pass Box Qualification

  • Installation Qualification (IQ): Ensures compliance with equipment purchase contract requirements.
  • Operational Qualification (OQ): Validates proper operation according to established standards.
  • Performance Qualification (PQ): Documents the dynamic pass box's long-term adherence to quality standards under normal manufacturing conditions.

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7. Maintenance Protocols

  • Regular replacement of filters with specified intervals and shutdown during replacement.
  • Periodic cleanliness measurements and thorough sterilization.
  • Proper procedures for HEPA filter replacement and maintenance checks.
maintenance protocols
Maintenance Protocols Pass Box

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8. Precautions on HEPA Filter Replacement

  • Attention to proper unpacking, handling, and installation to prevent damage to the filter.
  • Visual inspection for leaks before installation.
  • Strict adherence to replacement steps and airflow direction.

9. Usage Precautions

  • Indoor usage and storage only.
  • Adequate structural support in cleanroom floors and walls.
  • Caution against direct UV light exposure to the eyes.
  • Prohibition of opening both sides of the door without turning off the UV lamp.
  • Strict adherence to usage guidelines to avoid structural modifications.
  • Disconnection of power before UV lamp replacement.
use dynamic pass box in cleanroom
Dynamic Pass Box in Cleanroom

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Conclusion

Understanding the intricate details of dynamic pass box design, operation, and maintenance is crucial for ensuring a controlled and clean transfer environment. Implementing the outlined guidelines and precautions will contribute to the efficient and safe utilization of dynamic pass boxes in various controlled environments.