YiHeng GRX-9023A Forced-Air Hot Air Sterilization Oven

Overview

The YiHeng GRX-9023A Forced-Air Hot Air Sterilization Oven is a precision-engineered laboratory drying and thermal decontamination system designed for routine sterilization of glassware, metal instruments, and heat-stable laboratory materials. Operating on the principle of convective heat transfer via mechanically circulated dry air, the GRX-9023A ensures rapid and uniform thermal distribution throughout its stainless-steel chamber—critical for achieving microbiological lethality (e.g., destruction of bacterial endospores per ISO 17665-1 and USP ) and moisture removal in analytical sample preparation. Unlike natural-convection ovens, its integrated axial fan enables forced-air circulation, reducing thermal gradients and shortening process cycle times without compromising temperature stability. The unit complies with general safety requirements outlined in IEC 61010-1 for electrical equipment used in laboratory environments and supports GLP-compliant workflows through programmable timing and independent over-temperature protection.

Key Features

• Microprocessor-based digital temperature controller with LCD display, offering precise setpoint resolution of 0.1°C and real-time monitoring of chamber temperature.
• Forced-air convection system with three-stage adjustable fan speed—enabling optimization of airflow velocity for diverse load configurations and thermal mass profiles.
• Dual temperature range capability: selectable operation from ambient +10°C to 200°C or ambient +10°C to 250°C, accommodating both standard drying protocols and high-temperature sterilization cycles.
• Stainless steel (AISI 304) inner chamber construction ensures corrosion resistance, ease of cleaning, and long-term dimensional stability under repeated thermal cycling.
• Independent mechanical over-temperature cut-off device—activated at preset threshold—provides fail-safe thermal protection independent of the primary control circuit.
• Programmable timer with up to 999-minute duration allows unattended operation and repeatable process scheduling, supporting batch consistency in QC/QA laboratories.
• Removable, adjustable stainless steel shelving facilitates flexible load arrangement and simplifies chamber sanitation between runs.

Sample Compatibility & Compliance

The GRX-9023A is validated for use with non-volatile, thermally stable samples including borosilicate glassware, stainless-steel surgical tools, ceramic crucibles, filter housings, and desiccated reference standards. It is not suitable for flammable solvents, volatile organic compounds, or biological specimens requiring low-temperature preservation. The oven meets basic functional requirements for hot-air sterilization as referenced in ISO 17665-1 (Moist Heat), adapted for dry-heat applications per Annex C, and aligns with general Good Manufacturing Practice (GMP) expectations for equipment used in pharmaceutical manufacturing support areas (e.g., component depyrogenation). While not certified to EN 61010-2-040 (specific to sterilizers), its design incorporates essential safeguards consistent with risk-based validation frameworks under FDA 21 CFR Part 211 and EU GMP Annex 15.

Software & Data Management

The GRX-9023A operates via embedded firmware without external software dependency. All operational parameters—including set temperature, fan speed stage, timer duration, and real-time chamber temperature—are displayed and adjustable directly on the front-panel interface. No data logging, USB export, or network connectivity is provided; however, the instrument supports manual recordkeeping compatible with paper-based or electronic lab notebook (ELN) systems. For regulated environments requiring audit trails, users may integrate external temperature data loggers (e.g., compliant with NIST-traceable calibration) and document process parameters within their quality management system (QMS) per ISO 9001 or ISO/IEC 17025 requirements.

Applications

• Routine sterilization of reusable laboratory glassware and metal instruments using dry-heat cycles (e.g., 160°C for 120 minutes or 180°C for 30 minutes).
• Moisture removal from hygroscopic reagents, filters, and weighing vessels prior to gravimetric analysis.
• Pre-drying of soil, polymer, or pharmaceutical powder samples before moisture content determination (ASTM D2231, USP ).
• Accelerated aging studies of packaging materials and adhesives under controlled thermal stress conditions.
• Baking of coated substrates and curing of inorganic coatings where solvent-free thermal treatment is required.
• Depyrogenation of glass vials and stoppers in pre-formulation development labs, when validated per user-defined protocols.

FAQ

What is the maximum recommended operating temperature for routine sterilization?
The GRX-9023A supports sustained operation up to 250°C; however, standard dry-heat sterilization protocols typically specify 160–180°C for defined dwell times. Users must validate cycle efficacy for their specific load configuration.
Is the chamber volume sufficient for standard 1-L Erlenmeyer flasks?
Yes—the internal dimensions (340 × 325 × 320 mm) accommodate multiple 1-L flasks on two shelves when arranged horizontally, though optimal airflow requires ≥25 mm clearance around each item.
Does the oven support calibration traceability?
The unit includes no built-in calibration certificate; however, its temperature sensor and controller are compatible with external NIST-traceable probe calibration using Class A PT100 sensors per ASTM E74 and ISO/IEC 17025 guidelines.
Can this oven be used for moisture content testing per USP ?
Yes—when operated within validated temperature and time parameters, and paired with appropriate balance and desiccator procedures, it fulfills the instrumental requirements for loss-on-drying (LOD) assays.
Is the stainless steel chamber electropolished or passivated?
The standard GRX-9023A features brushed AISI 304 stainless steel without electropolishing; passivation is not performed at factory level but may be conducted post-installation per ASTM A967 if required for high-purity applications.