Laminar Air Flow Weighing Booth
1. Cabinet & Working Zone Sanitary Construction
- Internal Chamber & Worktop: Electropolished SUS304 stainless steel (Ra ≤0.8μm); SUS316L upgrade for high-corrosion hormone / cytotoxic powder workshops. Fully seamless argon arc welding, all wall-floor, wall-ceiling joints processed into integrated rounded coved arcs, zero sanitary dead corners for dust accumulation, easy wiping with alcohol, hydrogen peroxide and chlorine disinfectants.
- Outer Shell: Antibacterial powder-coated cold rolled steel, anti-fingerprint, scratch resistant.
- Front Access Option:
- Soft transparent PVC strip curtain (standard, low cost, flexible material transfer)
- Sliding tempered glass window (high-grade sterile zones, good isolation & visibility)
- Automatic fast rolling door (large trolley cargo sampling booth)
- Support Stand: Hot-dip galvanized square steel pipe frame, equipped with shock-absorbing vibration pads to eliminate weighing scale reading interference; 4 universal brake casters + adjustable leveling feet for flexible relocation.
2. 3-Stage Complete Filtration System (Core Containment Module)
- G4 Washable Primary Pre-filter: Top air intake, intercepts large lint and coarse dust
- F8 Medium Efficiency Pocket Filter: Captures medium fine powder, reduces HEPA load
- H14 Gel Seal Mini-Pleat HEPA Filter (Supply Air Ceiling): ≥99.995% efficiency @0.3μm MPPS, forms ISO Class5 clean vertical laminar flow over weighing table, each filter 100% full PAO scanned before delivery
- Secondary H14 Exhaust HEPA (Exhaust Outlet): Extra safety barrier to prevent toxic powder from discharging to workshop atmosphere, mandatory for cytotoxic / hormone drug production lines
3. Air Circulation & Negative Pressure System
- EC energy-saving variable frequency centrifugal fan, stepless adjustable air velocity 0.35–0.55m/s, constant vertical downflow 0.45m/s (GMP standard) over weighing surface
- Air circulation logic: 80–90% air internal recirculation after HEPA purification; 10–20% air exhausted outwards, creates stable -5 ~ -10Pa internal negative pressure to lock fugitive powder inside the booth
- Built-in triple differential pressure gauges: Real-time monitor pressure drop of pre-filter, F8 pocket filter and supply HEPA filter, auto alarm when filters clog to remind maintenance replacement
- Independent PAO/DOP test port reserved for HEPA on-site integrity testing during factory acceptance
4. Intelligent PLC Control & Auxiliary Functional Parts
- Touch screen microcomputer control panel: Real-time display wind speed, negative pressure value, filter clogging alarm, running hour record, UV sterilization timing setting
- Built-in UV germicidal lamp with interlock protection: UV only activates when fan stops and front curtain/window is closed, avoid operator ultraviolet radiation injury
- Cleanroom waterproof multi-hole power socket inside working zone: Power supply for analytical balance, electronic scale and small mixing equipment
- High-bright integrated LED purification lamp: Illumination ≥500lux, no horizontal dust-accumulating lamp housing
- Optional upgrades: ESD anti-static ionizer (for static-prone fine powder), explosion-proof motor (chemical flammable powder workshop), external exhaust duct flange, vibration isolation weighing
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