Shean LDZF-30L / LDZF-50L / LDZF-75L Vertical Steam Sterilizer

Overview

The Shean LDZF series vertical steam sterilizers are engineered for precision, safety, and regulatory compliance in laboratory, clinical, and pharmaceutical environments. These devices operate on the validated principle of saturated steam under pressure—leveraging the thermodynamic properties of moist heat to achieve microbial inactivation through protein denaturation and nucleic acid disruption. Designed to meet international sterilization standards—including ISO 17665-1 (Sterilization of health care products — Moist heat) and EN 285 (Large steam sterilizers)—the LDZF-30L, LDZF-50L, and LDZF-75L models deliver reproducible lethality (F₀) values across a wide operational envelope. Each unit is certified as a Class II pressure vessel per China’s TSG 21-2016 and GB/T 150.1–150.4, with full traceability of material certification, hydrostatic test records, and design validation documentation available upon request.

Key Features

• Multi-link lever-type lid actuation mechanism ensures synchronized, low-effort opening/closing with mechanical self-locking at pressure; eliminates manual alignment errors and enhances operator ergonomics.
• Chamber constructed from medical-grade 304 stainless steel (≥22 mm wall thickness), passivated per ASTM A967, providing long-term corrosion resistance and compatibility with repeated sterilization cycles over a design service life of ≥10 years.
• Self-sealing silicone gasket system with dynamic compression profile maintains leak-tight integrity across temperature and pressure transients (0–0.24 MPa, 50–134 °C).
• LED-based digital controller with real-time cycle progress visualization, including phase indicators (pre-vacuum, heating, sterilization, exhaust, cooling) and audible/visual end-of-cycle alerts.
• One-touch parameter programming interface supports rapid setup of temperature (50–134 °C), time (0–99 h), and pre-set cycle profiles (e.g., wrapped/unwrapped instruments, liquids, porous loads).
• Integrated forced-air cooling system reduces chamber temperature to ≤50 °C within 15–25 minutes post-sterilization, minimizing downtime and improving throughput.
• Dual redundant safety architecture: mechanical spring-loaded safety valve (ASME Section I compliant) + electronic overpressure cutoff (0.24 MPa trip threshold) + interlocked lid sensor that physically prevents opening under pressure.
• Comprehensive protection suite includes dry-run prevention (water level sensor), earth leakage circuit interruption (30 mA sensitivity), automatic air purge (pre-sterilization vacuum assist), and real-time temperature deviation correction via PID feedback loop.
• Optional RS232/RS485 port supports connection to external data loggers or LIMS; optional thermal printer module provides audit-ready hardcopy records of date/time, chamber temperature, pressure, and cycle duration—fully compliant with FDA 21 CFR Part 11 requirements when paired with validated software.

Sample Compatibility & Compliance

The LDZF series accommodates a broad range of load types: wrapped surgical kits, glassware, culture media (including agar and broth), pipette tips, textile packs, and non-porous polymer components. Chamber geometry (cylindrical, uniform diameter) ensures consistent steam penetration and condensate drainage. All models comply with national mandatory standards for sterilizer classification (YY/T 0646–2021), electromagnetic compatibility (GB/T 18268.1), and electrical safety (GB 4793.1). Documentation packages include Factory Acceptance Test (FAT) reports, calibration certificates for integrated PT100 sensors (±0.3 °C accuracy), and conformity declarations aligned with CE marking directives (2014/34/EU, 2014/68/EU).

Software & Data Management

The embedded microcontroller firmware implements deterministic real-time cycle control with non-volatile memory retention of ≥1000 completed cycles. Event logs record timestamps for all critical events: door status transitions, pressure/temperature excursions, safety interventions, and user authentication actions. When equipped with the optional print module, each sterilization run generates a GMP-compliant record containing operator ID (if enabled), batch number input field, F₀ calculation (based on integrated temperature profiling), and digital signature verification. Data export via USB or serial interface enables integration into enterprise quality management systems (QMS) supporting ISO 13485 or Annex 11 workflows.

Applications

• Microbiology laboratories: sterilization of Petri dishes, inoculation loops, nutrient broths, and liquid waste containers.
• Hospital central sterile supply departments (CSSD): processing of reusable surgical instruments, drapes, and gowns in accordance with AAMI ST79 guidelines.
• Pharmaceutical R&D labs: depyrogenation validation studies, media preparation, and component bioburden reduction prior to aseptic filling.
• Academic research facilities: decontamination of biohazardous waste, animal cage bedding, and genetically modified organism (GMO) containment materials.
• Quality control units: routine validation of autoclave performance using biological indicators (e.g., Geobacillus stearothermophilus spores) and process challenge devices (PCDs).

FAQ

What pressure vessel certifications does the LDZF series hold?
All LDZF models are registered as Class II fixed pressure vessels under China’s TSG 21-2016 regulation and conform to GB/T 150.1–150.4 for design, fabrication, and inspection. Certificates of Conformity and hydrostatic test reports are provided with each unit.
Can the sterilizer be validated for GMP environments?
Yes—the LDZF series supports IQ/OQ/PQ protocols. It features calibrated PT100 sensors (traceable to NIM), programmable cycle repeatability (<±0.5 °C temperature stability), and optional data logging/printing for full 21 CFR Part 11 compliance.
Is the chamber suitable for sterilizing liquids?
Yes. The LDZF series includes dedicated liquid cycle modes with slow exhaust and extended dwell times to prevent boil-over. Chamber pressure ramp rates are optimized to minimize thermal shock to glass containers.
What maintenance intervals are recommended?
Daily: visual inspection of gasket integrity and water level. Monthly: verification of safety valve operation and door seal compression. Annually: third-party recalibration of temperature/pressure sensors and comprehensive FAT re-execution.
Does the unit support remote monitoring?
Via optional RS485 Modbus RTU interface, the sterilizer can integrate with building management systems (BMS) or SCADA platforms for centralized alarm notification and cycle status polling.