Zhicheng ZHJH-C1209C Intelligent Safety Clean Bench with HEPA Failure Alert

Overview

The Zhicheng ZHJH-C1209C Intelligent Safety Clean Bench is a vertically downflow, dual-opening laminar flow workstation engineered for ISO Class 5 (FS209E Class 100) environments. It employs a validated unidirectional airflow system in which ambient air passes sequentially through a pre-filter and a certified HEPA filter (≥99.995% efficiency at 0.3 µm), generating a uniform, particle-free vertical airstream across the work surface. Unlike conventional clean benches lacking real-time filtration integrity assurance, the ZHJH-C1209C integrates continuous HEPA performance monitoring—measuring differential pressure across the filter media and correlating it with airflow velocity, volumetric flow rate, and operational time—to proactively detect degradation, blockage, or physical breach. This architecture aligns with fundamental biosafety engineering principles defined in ISO 14644-1, NSF/ANSI 49 (for non-recirculating devices), and GLP-compliant laboratory infrastructure requirements where procedural reliability depends on verifiable air quality continuity.

Key Features

• Real-time HEPA integrity surveillance: simultaneous online measurement of filter differential pressure (0–500 Pa, ±1% accuracy), airflow velocity (0.3–0.6 m/s, ±0.05 m/s control precision), and cumulative runtime
• Multi-stage HEPA alerting system: visual (full Chinese LCD interface), audible, and luminous warnings for impending filter exhaustion, confirmed failure, or mechanical rupture—preventing undetected contamination events
• Infinitely adjustable, closed-loop velocity control: maintains setpoint airflow regardless of filter loading or ambient pressure fluctuations; displayed digitally with 0.1 m/s resolution
• Programmable UV sterilization cycle: user-defined start/end times for quartz germicidal lamps (254 nm), integrated with interlocked sash safety cutoff
• Human-centered HMI: 5.7-inch backlit LCD panel with touch-sensitive icons, clock display, runtime accumulator, and dual-mode operation (manual override or fully automated sequence)
• Structural compliance features: electrophoretically coated steel enclosure, 304 stainless steel work surface with radius-free interior corners, counterbalanced tempered glass sash (vertical lift, infinite stop), and dual side-view tempered glass panels for optical clarity and ergonomic access
• Acoustic and mechanical optimization: low-vibration centrifugal blower (≤3 µm half-peak), noise-dampened ductwork (≤62 dB[A]), and high-static-pressure delivery at low volumetric flow

Sample Compatibility & Compliance

The ZHJH-C1209C is designed for sterile handling of non-hazardous biological samples, pharmaceutical intermediates, diagnostic reagents, and microelectronics components. Its vertical downflow configuration ensures that critical work surfaces remain continuously flushed with HEPA-filtered air, minimizing cross-contamination between adjacent tasks. The unit meets ISO 14644-1 Class 5 particulate cleanliness requirements (≤3.5 particles ≥0.5 µm per liter) and demonstrates microbial recovery ≤0.5 CFU per 90 mm settle plate under standardized test conditions (ISO 14698-1). While not rated for containment of biohazards (i.e., not a biosafety cabinet per NSF/ANSI 49), its HEPA status monitoring subsystem supports audit readiness for GMP Annex 1 (EU), FDA 21 CFR Part 211, and ISO/IEC 17025-accredited laboratories requiring documented evidence of environmental control continuity.

Software & Data Management

The embedded control firmware provides traceable operational logging without external PC dependency. All monitored parameters—including velocity setpoint, actual velocity, HEPA ΔP, total runtime, UV exposure duration, and alarm event timestamps—are stored in non-volatile memory with overwrite protection. The LCD interface displays real-time values and retains historical alerts for up to 100 events, each tagged with date/time and condition type (e.g., “HEPA ΔP >480 Pa – Warning”, “UV Cycle Completed”). Though no proprietary software suite is required, data export via optional RS-232 or USB-to-serial adapter enables integration into centralized lab infrastructure management systems compliant with 21 CFR Part 11 electronic record controls when paired with validated third-party middleware.

Applications

This clean bench serves routine aseptic procedures in regulated and research settings including: cell culture passaging and media preparation in academic and biotech labs; sterile assembly of diagnostic kits and point-of-care devices; formulation and packaging of non-sterile pharmaceutical excipients; environmental microbiology sampling preparation; and precision assembly of optical sensors and semiconductor prototypes. Its dual-opening layout and 900 mm work width accommodate parallel workflows—such as simultaneous pipetting and microscope observation—while the programmable UV cycle reduces manual intervention between shifts, improving throughput consistency in high-utilization facilities.

FAQ

Does the ZHJH-C1209C comply with international cleanroom standards?
Yes—it achieves ISO 14644-1 Class 5 (formerly FS209E Class 100) for airborne particulates and supports validation protocols aligned with ISO 14644-3 and EU GMP Annex 1.
Can the HEPA filter status be verified without physical inspection?
Yes—the system continuously monitors differential pressure across the HEPA media and correlates it with airflow metrics to generate predictive alerts prior to performance deviation.
Is UV sterilization automatically disabled when the sash is opened?
Yes—hardwired interlock circuitry cuts power to UV lamps immediately upon sash movement, meeting IEC 61000-6-4 electromagnetic compatibility and occupational safety requirements.
What maintenance documentation is provided for regulatory audits?
Factory calibration certificates for airflow sensors and pressure transducers, HEPA filter certification reports (EN 1822-3), and a complete technical manual with preventive maintenance schedules are included.
Is the unit suitable for use with volatile organic solvents?
No—this is a clean bench, not a fume hood; it lacks exhaust ducting and solvent-rated construction. Use only with low-volatility, non-toxic reagents in well-ventilated rooms.