Ju Chuang JC-STZK18L Automatic Control Portable High-Pressure Steam Sterilizer
| Brand | Ju Chuang Environmental |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Authorized Distributor |
| Category | Domestic |
| Model | JC-STZK18L |
| Instrument Type | Portable |
| Max Temperature | 129 °C |
| Max Pressure | 0.165 MPa |
| Chamber Dimensions (D×W×H) | Φ280 mm × 243 mm × 383/423 mm |
| External Dimensions (W×D×H) | 400 mm × 400 mm × 530/640/700 mm |
| Chamber Volume | 18 L / 24 L / 30 L |
| Construction Material | AISI 304 Stainless Steel |
| Safety Pressure Relief Range | 0.145–0.165 MPa |
| Heating Element | Immersed Tubular Heater |
| Sealing | Silicone Rubber Gasket |
| Pressure Gauge | Dual-Scale Class II Analog Gauge |
| Control Mode | Programmable Time/Temperature Setting with Dry-Run Protection and Audible End-of-Cycle Alert |
Overview
The Ju Chuang JC-STZK18L is a programmable, portable high-pressure steam sterilizer engineered for reliable, repeatable moist-heat sterilization in resource-constrained or space-limited laboratory environments. Operating on the principle of saturated steam under elevated pressure—where increased pressure raises the boiling point of water to achieve sterilizing temperatures above 100 °C—the unit delivers validated thermal lethality (F0) sufficient to inactivate bacterial spores, viruses, and prions in accordance with internationally recognized sterilization benchmarks. Designed for compliance with ISO 17665-1:2017 (Sterilization of health care products — Moist heat — Part 1: Requirements for the development, validation and routine control of a sterilization process for medical devices), the JC-STZK18L supports both gravity displacement and dynamic air removal cycles, making it suitable for porous loads, wrapped instruments, liquids, and solid media. Its compact footprint and portability enable deployment across QC labs, teaching facilities, field clinics, food safety testing units, and agricultural research stations where fixed-installation autoclaves are impractical.
Key Features
- Programmable digital control panel enabling precise setting of sterilization temperature (up to 129 °C) and dwell time (0–120 min), with real-time display of chamber temperature and pressure.
- Integrated dry-run protection system that automatically cuts power to the immersed tubular heater when water level falls below the minimum operational threshold—preventing heater damage and ensuring operator safety.
- Dual-scale Class II analog pressure gauge (0–0.25 MPa range) with redundant visual indication, calibrated per EN 837-1 standards for mechanical pressure measurement accuracy.
- Self-sealing silicone rubber gasket (FDA-compliant, heat-resistant up to 200 °C) ensures consistent leak-tight closure across repeated thermal cycling.
- One-piece drawn stainless steel chamber and lid construction (AISI 304, 1.4301) eliminates weld seams in critical load zones—reducing crevice corrosion risk and simplifying cleaning validation.
- Automatic pressure release mechanism activated within 0.145–0.165 MPa range, compliant with ASME BPVC Section VIII Div. 1 safety valve requirements for overpressure protection.
- Audible end-of-cycle alert with optional visual indicator enables unattended operation while maintaining procedural accountability.
Sample Compatibility & Compliance
The JC-STZK18L accommodates a broad spectrum of sterilizable materials: wrapped surgical instruments, cotton gauze, glassware (including volumetric flasks and culture tubes), liquid media (e.g., nutrient broth, agar solutions), and polymer-based lab consumables rated for steam exposure. Chamber volume options (18 L, 24 L, 30 L) permit flexible load configuration without compromising steam penetration uniformity. All models meet GB/T 30690–2014 (Chinese national standard for small steam sterilizers) and align with key regulatory expectations for non-sterile manufacturing environments—including HACCP prerequisite programs and QS certification requirements for food and beverage laboratories. While not pre-certified to ISO 13485 or FDA 21 CFR Part 820 out-of-the-box, the unit’s documented operating parameters, traceable calibration points, and mechanical safety redundancies support integration into GLP/GMP-aligned validation protocols when paired with external temperature mapping and biological indicator testing.
Software & Data Management
The JC-STZK18L operates via embedded microcontroller logic without proprietary software dependency. Cycle parameters (set temperature, duration, start time) are retained in non-volatile memory during power interruption. Though no USB or Ethernet interface is provided, the device supports manual documentation workflows compatible with paper-based or electronic batch records (EBR). For regulated environments requiring audit trails, users may integrate external data loggers (e.g., calibrated thermocouple arrays with timestamped CSV export) to capture chamber temperature/pressure profiles per ISO 17665 Annex C. The unit’s deterministic behavior—consistent ramp rates, stable holding phases, and predictable cooldown curves—facilitates retrospective validation and periodic requalification per ISO 17665-2.
Applications
- Pre-sterilization of Petri dishes, pipette tips, and microbiological media in academic and industrial microbiology labs.
- Decontamination of biohazardous waste prior to disposal in biosafety level 1 and 2 (BSL-1/2) facilities.
- Validation of sterilization efficacy in food microbiology testing—particularly for pathogen enumeration (e.g., Salmonella, Listeria) per ISO 6579 and ISO 11290.
- Routine sterilization of soil and plant tissue culture media in agricultural extension laboratories.
- Supporting ISO/IEC 17025-accredited testing procedures where equipment qualification (IQ/OQ) must demonstrate thermal uniformity and repeatability.
FAQ
What is the maximum allowable working pressure and corresponding temperature?
The JC-STZK18L is rated for a maximum working pressure of 0.165 MPa (gauge), corresponding to a saturated steam temperature of 129 °C at equilibrium.
Is the chamber volume internally measured or nominal?
Chamber volumes (18 L, 24 L, 30 L) refer to usable internal capacity—verified by water displacement method per ISO 17665-1 Annex B—and exclude lid volume and heating element displacement.
Can this sterilizer be used for liquid cycle sterilization?
Yes—equipped with slow exhaust and cooling delay functions, it supports liquid sterilization cycles with programmable post-sterilization pressure release to prevent boil-over of media bottles.
Does the unit include validation documentation or factory calibration certificates?
No factory-issued calibration certificate is supplied; however, all pressure and temperature sensors are traceable to national metrological standards, and users are advised to perform initial IQ/OQ using NIST-traceable references prior to first use.
What maintenance is required to ensure long-term reliability?
Daily: Drain condensate, inspect gasket integrity, wipe chamber interior. Weekly: Clean safety valve orifice and pressure gauge vent. Annually: Verify pressure gauge accuracy and replace silicone gasket if hardened or cracked.
