OK STH-10M3A Walk-in Environmental Test Chamber
| Brand | OK |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic (China) |
| Model | STH-10M3A |
| Internal Dimensions (W×D×H) | 2000 × 2000 × 2500 mm |
| Temperature Range | −70°C to +80°C (selectable sub-ranges: A: 0°C, B: −20°C, C: −40°C, D: −60°C, E: −70°C) |
| Humidity Range | 20–98% RH |
| Temperature Uniformity | ±2°C |
| Temperature Fluctuation | ±0.5°C |
| Humidity Fluctuation | ±3.0% RH (75–98% RH), ±5.0% RH (20–75% RH) |
| Temperature Deviation | ±2°C |
| Control Accuracy | ±1°C |
| Average Heating Rate | 1.0–4.0°C/min |
| Average Cooling Rate | ≥1.0°C/min (full range) |
| Refrigeration System | Hermetic dual-stage cascade compressor with eco-friendly refrigerants R404A/R23 |
| Controller | 7-inch color LCD touch screen with bilingual (English/Chinese) interface |
| Power Supply | AC 380 V ±5%, 50 Hz ±0.5 Hz, 3-phase 5-wire |
| Construction | Interior – 304 stainless steel |
| Compliance | GB/T 2423.1–2001 (Cold), GB/T 2423.2–2001 (Dry Heat), GB/T 2423.3–2006 (Constant Damp Heat), GB/T 2423.4–2008 (Cyclic Damp Heat), GJB 150.3A–2009 (High Temp), GJB 150.4A–2009 (Low Temp), GJB 150.9A–2009 (Humidity) |
Overview
The OK STH-10M3A Walk-in Environmental Test Chamber is an industrial-grade, large-volume climate simulation system engineered for precise and reproducible thermal and hygrothermal conditioning of oversized components, subassemblies, and finished products. Designed according to fundamental principles of psychrometric control and forced-air convection thermodynamics, the chamber maintains stable temperature and humidity profiles across its full internal volume (2 m × 2 m × 2.5 m) under continuous operation. Its dual-stage cascade refrigeration architecture enables reliable operation down to −70°C while simultaneously supporting high-humidity conditions up to 98% RH—critical for validating long-term material integrity, seal performance, condensation resistance, and functional reliability in mission-critical applications. The chamber serves as a primary verification tool in environmental stress screening (ESS), accelerated life testing (ALT), and qualification per MIL-STD-810, IEC 60068, and aerospace-specific test protocols.
Key Features
- Modular insulated panel construction (PU-core sandwich panels) allows flexible on-site assembly, future expansion, or relocation—ideal for evolving facility layouts or phased capacity upgrades.
- Energy-optimized control logic dynamically modulates compressor output and heater duty cycle, reducing average power consumption by up to 30% compared to conventional on/off heating-balance systems.
- Hermetically sealed, low-noise dual-stage compressors ensure consistent cooling performance across extreme low-temperature setpoints, with R404A/R23 refrigerant compliance aligned with current global environmental regulations.
- Integrated 7-inch industrial-grade touchscreen controller supports real-time parameter monitoring, multi-segment program editing, data logging, alarm history, and seamless language switching between English and Chinese interfaces.
- Robust mechanical design includes CNC-machined structural framing, non-spring-loaded ergonomic door handles, six adjustable leveling feet, six heavy-duty casters, and one standard 50 mm cable port—enabling safe access, secure positioning, and instrument interconnection without compromising chamber integrity.
Sample Compatibility & Compliance
The STH-10M3A accommodates large-format test specimens including automotive ECUs, avionics racks, server cabinets, medical imaging systems, and industrial control panels—objects exceeding standard benchtop chamber dimensions. Its uniform airflow distribution system ensures spatial temperature deviation remains within ±2°C and humidity variation within specified tolerances across the entire working volume. The chamber is fully compliant with major national and defense standards, including GB/T 2423 series (cold, dry heat, constant/cyclic damp heat), GJB 150.3A–2009 (high temperature), GJB 150.4A–2009 (low temperature), and GJB 150.9A–2009 (humidity). While not pre-certified to ISO/IEC 17025 or accredited to GLP/GMP, the system supports traceable calibration documentation and can be integrated into validated quality management systems requiring audit-ready operational records.
Software & Data Management
Data acquisition and remote supervision are enabled via standardized industrial communication protocols: RS-232, RS-485, USB 2.0, and Ethernet (LAN). Optional OK-DataLink software provides PC-based configuration, real-time trending, automated report generation (PDF/CSV), and event-triggered email alerts. All logged parameters—including chamber setpoint, actual temperature/humidity, compressor status, alarm timestamps, and user login events—are time-stamped with millisecond resolution. Audit trail functionality meets basic requirements for FDA 21 CFR Part 11 compliance when deployed with appropriate IT governance controls (e.g., password policies, role-based access, electronic signature workflows).
Applications
- Aerospace component validation: thermal cycling of flight control modules under simulated altitude-humidity profiles.
- Automotive electronics qualification: endurance testing of ADAS sensors and infotainment units per ISO 16750-4.
- Pharmaceutical packaging stability studies: accelerated aging of blister packs and vial closures under controlled RH gradients.
- Electronics manufacturing: burn-in testing of server chassis and telecom base station enclosures prior to field deployment.
- Materials science research: hygrothermal aging of polymer composites, coatings, and adhesives to assess dimensional stability and delamination thresholds.
FAQ
What is the maximum allowable load weight inside the chamber?
The floor loading capacity is rated at 800 kg distributed evenly across the stainless-steel interior base plate. Point loads must be supported by auxiliary staging to avoid localized deformation.
Can the chamber be configured for rapid temperature transition testing (e.g., thermal shock)?
No—the STH-10M3A is optimized for steady-state and ramp-and-soak profiles, not discontinuous thermal shock. For such applications, dedicated two-zone or three-zone thermal shock chambers are recommended.
Is third-party calibration certification available?
Yes—OK Instruments offers optional NIST-traceable calibration services performed by ISO/IEC 17025-accredited partners, including uncertainty reporting and certificate issuance.
Does the controller support custom test sequences with conditional logic?
The embedded controller supports up to 120 programmable segments per profile, including ramp rates, dwell times, and loop counts—but does not support IF-THEN branching or external sensor feedback loops. Advanced logic requires integration with external PLC or SCADA systems.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil and filter replacement is advised every 24 months under continuous operation; annual inspection of refrigerant charge, condenser coil cleanliness, and door gasket integrity is required to maintain specified performance tolerances.
