Chu Ding Technology LDZX-75KAS Manual-Lever Controlled Vertical Steam Sterilizer (Stainless Steel)

Overview

The Chu Ding Technology LDZX-75KAS is a manually operated, vertical steam sterilizer engineered for reliable, repeatable moist-heat sterilization in laboratory, educational, pharmaceutical, and biomedical settings. It operates on the fundamental principle of saturated steam under controlled pressure—where elevated temperature (up to 128 °C) and corresponding pressure (up to 0.165 MPa) synergistically achieve microbial inactivation through protein denaturation and nucleic acid disruption. Unlike automated cycle controllers, the LDZX-75KAS employs a manual lever-driven door mechanism and analog process monitoring, offering direct mechanical control ideal for environments prioritizing operational transparency, maintenance simplicity, and regulatory traceability via physical logs. Its 75-liter chamber accommodates standard sterilization loads including wrapped surgical instruments, glassware, culture media bottles, textile packs, and liquid preparations—compliant with core requirements outlined in ISO 17665-1 (Sterilization of health care products — Moist heat) and aligned with national medical device sterilization standards for non-critical and semi-critical items.

Key Features

• Full 304 stainless steel construction: Corrosion-resistant chamber, jacket, and exterior housing ensure long-term durability against repeated steam exposure and chemical cleaning agents.
• Manual lever-type quick-opening door: Patented self-tightening mechanical linkage enables secure sealing at operating pressure while allowing rapid, tool-free access post-cycle—reducing turnaround time without compromising safety interlocks.
• Self-inflating silicone gasket seal: Automatically expands under chamber pressure to maintain leak-tight integrity across thermal cycles; validated for >10,000 sterilization cycles per OEM specification.
• Dual-scale Class II analog pressure gauge: Simultaneously displays chamber pressure in MPa and psi with ±0.01 MPa accuracy—enabling real-time verification of sterilization conditions independent of electronic systems.
• Pressure-activated safety relief valve: Calibrated to auto-discharge at 0.145–0.165 MPa, preventing over-pressurization even during power failure or operator error.
• Low-water cut-off protection: Thermally actuated sensor interrupts heating if water level falls below minimum safe threshold—preventing dry-heating damage to the heating element and chamber base.
• Interlocked door lock system: Physically prevents door opening until chamber pressure drops to ambient, satisfying ASME PVHO-1 (Pressure Vessels for Human Occupancy) derived safety logic for pressurized enclosures.
• LED status indicators: Dedicated lights for power-on, heating, sterilization phase, and cooling—supporting visual operational awareness in shared lab environments.

Sample Compatibility & Compliance

The LDZX-75KAS accommodates heterogeneous load configurations: porous loads (e.g., gauze, drapes), solid instruments (scalpels, forceps), liquids (broths, agar media up to 1000 mL per container), and hollow devices (cannulas, pipette tips). Load placement follows gravity-displacement steam dynamics—requiring vertical orientation of containers and avoidance of stacked layers that impede steam penetration. The unit meets GB/T 30690–2014 (Chinese national standard for small steam sterilizers), and its design principles conform to ISO 13485:2016 clause 7.5.11 (Control of monitoring and measuring equipment) when used with calibrated external thermometers and pressure transducers. While not FDA 510(k)-cleared as a medical device, it satisfies GLP-compliant sterilization protocols for non-clinical research labs per OECD Principles of Good Laboratory Practice.

Software & Data Management

The LDZX-75KAS is a hardware-controlled sterilizer with no embedded microprocessor or digital interface. Process documentation relies on external recording: users log start/end times, observed pressure/temperature readings (via dual-scale gauge and optional calibrated thermocouple), and load composition in bound sterilization logs—consistent with ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) data integrity expectations. For laboratories requiring electronic records, integration with standalone chart recorders or USB-connected data loggers (e.g., Omega OM-CP-HITEMP140) is supported via 4–20 mA output ports (optional accessory). All mechanical controls and analog gauges are fully serviceable without firmware updates, ensuring long-term audit readiness under FDA 21 CFR Part 11 when paired with handwritten SOPs and wet-ink signatures.

Applications

• Sterilization of microbiological culture media (agar, broth) and glassware in university teaching labs and QC departments.
• Decontamination of reusable surgical instruments and textile packs in veterinary clinics and field hospitals.
• Pre-sterilization conditioning of filtration membranes and chromatography columns prior to HPLC/UPLC use.
• Validation support for autoclave qualification studies (IQ/OQ/PQ) where manual intervention and deterministic parameter observation are required.
• Food safety testing labs processing environmental swabs and nutrient agar plates under ISO/IEC 17025-accredited methods.

FAQ

What is the maximum allowable fill volume for liquid loads in the LDZX-75KAS chamber?
For safe sterilization without boil-over, liquid containers must occupy ≤75% of internal volume and be placed upright with loose caps; total liquid load should not exceed 40 L per cycle.
Does this sterilizer support vacuum-assisted air removal?
No—the LDZX-75KAS uses gravity displacement only; it lacks a vacuum pump or pulsing cycle, making it unsuitable for porous or lumened device sterilization per ISO 11140-1.
Can the chamber temperature be verified with a Class N or Class S thermometer per EN 285?
Yes—its cylindrical geometry and uniform steam distribution allow validation using calibrated reference thermometers inserted into biological indicator challenge vials at multiple chamber locations.
Is third-party calibration certification available for the pressure gauge?
Yes—OEM-recommended calibration services are offered by ISO/IEC 17025-accredited metrology labs; annual recalibration is advised per ISO 9001 clause 7.1.5.2.
What maintenance intervals are specified for the sealing gasket?
Inspect visually before each use; replace every 12 months or after 500 cycles—whichever occurs first—to maintain ASME Section VIII Div. 1 compliance.