Zhicheng ZXRD-7140 Advanced Forced-Air Constant-Temperature Oven

Overview

The Zhicheng ZXRD-7140 Advanced Forced-Air Constant-Temperature Oven is an engineered solution for precision thermal processing in life science and industrial laboratory environments. Designed around the principle of convective dry-heat sterilization and controlled thermal dehydration, this oven delivers reproducible, uniform heating across its 140 L chamber—enabling reliable drying, baking, sterilization, and microbiological decontamination of glassware, instruments, media components, and non-heat-sensitive reagents. Unlike natural convection ovens, the ZXRD-7140 employs rear-mounted horizontal forced-air circulation, ensuring rapid thermal equilibration and minimizing stratification effects. Its operational envelope spans from ambient +5 °C up to 300 °C, supporting both low-temperature moisture removal and high-temperature microbial inactivation via protein denaturation, oxidative stress, and electrolyte disruption—mechanisms validated under ISO 14644-1 cleanroom environmental control guidelines and referenced in USP for dry-heat sterilization validation.

Key Features

• High-response platinum RTD sensor coupled with an environmental-scan microprocessor for real-time thermal feedback and closed-loop PID temperature regulation
• Triple-layer safety architecture: overtemperature audio-visual alarm, automatic heater disconnection at critical thresholds, and intelligent auto-resume functionality upon power restoration
• Embedded large-area plate-type heating system with optimized thermal mass distribution, ensuring spatial temperature uniformity ≤ ±2.5% at 300 °C (per ASTM E2293-21 Annex A2)
• Engineered airflow path with laminarized micro-gas circulation—designed to minimize turbulence-induced thermal gradients while preserving sample integrity
• Electropolished 304 stainless steel interior and tempered glass viewing door with reinforced stainless frame—facilitating visual monitoring without compromising containment or corrosion resistance
• LED-display interface with simultaneous readout of setpoint and actual chamber temperature, timer status, and system diagnostics
• Onboard temperature calibration offset function (±9.9 °C range), supporting traceable adjustments per ISO/IEC 17025-compliant internal verification protocols
• Programmable timer (1 minute to 99 hours 59 minutes) with audible endpoint notification and non-volatile parameter memory for protocol repeatability

Sample Compatibility & Compliance

The ZXRD-7140 accommodates a broad spectrum of laboratory materials—including borosilicate glassware, stainless steel tools, ceramic substrates, filter membranes, and desiccated biological matrices—without inducing thermal shock or surface oxidation under controlled ramp profiles. Its chamber geometry and inert interior finish meet Class II biosafety cabinet compatibility requirements for pre-sterilization conditioning. While not certified as a medical device under FDA 21 CFR Part 820, the unit supports GLP/GMP-aligned workflows through auditable temperature logging (when integrated with external data acquisition systems), configurable alarm thresholds, and hardware-level fault detection. It complies with IEC 61010-1:2010 for electrical safety in laboratory equipment and conforms to electromagnetic compatibility standards EN 61326-1:2013.

Software & Data Management

The ZXRD-7140 operates as a standalone instrument with no proprietary software dependency. All operational parameters—including temperature setpoint, dwell time, ramp rate (fixed), and alarm limits—are configured directly via the front-panel interface. For laboratories requiring electronic recordkeeping, optional RS-485 or analog 4–20 mA output modules enable integration with SCADA platforms, LIMS, or custom Python-based data loggers. Audit trails are maintained via manual logbooks aligned with ISO 17025 clause 7.7; future firmware upgrades may support timestamped event logging (e.g., door open/close, temperature deviation >0.5 °C, heater activation cycles) compliant with FDA 21 CFR Part 11 when paired with validated third-party software.

Applications

• Drying of moisture-sensitive powders, lyophilized intermediates, and chromatographic stationary phases
• Sterilization of surgical instruments, pipette tips, and Petri dishes via validated dry-heat cycles (e.g., 160 °C for 120 min per ISO 17665-1)
• Baking of quartz cuvettes and optical components prior to UV-Vis calibration
• Thermal aging studies of polymer-based lab consumables and packaging materials
• Residue removal from HPLC vials and GC sample liners
• Pre-conditioning of desiccants and molecular sieves used in analytical sample preparation
• Stabilization of enzyme preparations during formulation development

FAQ

What is the maximum validated sterilization temperature for dry-heat applications?
The ZXRD-7140 achieves stable operation at 300 °C, enabling validation of dry-heat sterilization cycles per ISO 17665-1 Annex B—commonly specified at 160–180 °C for 60–120 minutes depending on bioburden and load configuration.
Can the oven be used for moisture content analysis per AOAC or ASTM D2231?
Yes—its ±0.1 °C resolution and ≤±1 °C fluctuation meet the thermal stability requirements for gravimetric moisture determination when operated within the 105–135 °C range with calibrated analytical balances.
Is the interior volume fully accessible for cleaning and validation swabbing?
The mirror-finish stainless steel chamber, removable electropolished shelves, and unobstructed rear air inlet duct allow complete physical access for cleaning verification and microbial recovery testing per ISO 14644-3.
Does the unit support ramp-and-soak temperature programming?
No—the ZXRD-7140 implements single-setpoint control with fixed-rate heating. Multi-step thermal profiles require external programmable controllers or sequential manual intervention.
What maintenance intervals are recommended for long-term reliability?
Biannual inspection of fan motor bearings, quarterly verification of RTD calibration against NIST-traceable reference probes, and annual replacement of door gasket seals are advised per manufacturer service documentation.