OK-STH-8.123m² Walk-in Environmental Test Chamber
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | OK-STH-8.123m² |
| Price | ¥80,000 (RMB) |
| Internal Dimensions (D×W×H) | 2000 × 2000 × 2000 mm |
| Temperature Range Options | A: 0°C / B: −20°C / C: −40°C / D: −60°C / E: −70°C |
| Temperature Uniformity | ±3°C |
| Temperature Control Accuracy | ±1°C |
| Heating Rate | 1.0–4.0°C/min |
Overview
The OK-STH-8.123m² Walk-in Environmental Test Chamber is an engineered solution for large-scale thermal stress evaluation under controlled ambient conditions. Designed in accordance with the fundamental principles of convective heat transfer and forced-air circulation thermodynamics, this chamber enables precise simulation of extreme temperature environments—from sub-zero cryogenic exposure to elevated thermal loads—within a fully accessible, operator-safe walk-in enclosure. Its architecture integrates a dual-circuit refrigeration system (configurable as single-stage or cascade depending on selected low-temperature option), high-efficiency electric heating elements, and a robust air distribution manifold to ensure stable thermal gradients across the entire 8.123 m³ working volume. The chamber supports compliance-driven validation protocols required in automotive component qualification (e.g., ISO 16750-4), aerospace environmental screening (MIL-STD-810H Method 502.7), and industrial electronics reliability testing (IEC 60068-2-1/2).
Key Features
- Modular structural design with double-wall insulated panels (150 mm polyurethane core, 0.8 mm pre-painted steel cladding) for thermal integrity and long-term dimensional stability.
- Configurable temperature range options spanning from 0°C to −70°C, enabling selection of optimal refrigeration architecture: standard single-stage compression for −20°C models; cascade dual-refrigerant systems for −40°C and lower variants.
- Precision PID-based digital temperature controller with real-time feedback loop compensation, delivering ±1°C control accuracy and ±3°C uniformity per IEC 60068-3-5 across the full test volume.
- Adjustable heating ramp rate (1.0–4.0°C/min) calibrated against defined reference load conditions (no-load, static air), supporting both steady-state thermal soak and moderate dynamic thermal profiling.
- Integrated safety interlocks including over-temperature cutoff, refrigerant pressure monitoring, door-mounted emergency stop, and independent mechanical thermostat backup.
- Standard access features: double-sealed insulated door (900 × 2000 mm), internal LED lighting, observation window with anti-fog coating, and cable/port penetration sleeves (4 × Φ80 mm).
Sample Compatibility & Compliance
The OK-STH-8.123m² accommodates heterogeneous test loads—including assembled subsystems, server racks, battery modules, and vehicle ECUs—without compromising thermal fidelity. Its open-floor layout and 2 m interior height allow for vertical stacking, fixture mounting, and integration with external instrumentation (e.g., data loggers, power analyzers). All configurations comply with essential electromagnetic compatibility (EMC) and electrical safety directives per GB/T 14048.1 (equivalent to IEC 60947-1) and GB 4793.1 (IEC 61010-1). For regulated industries, the chamber’s operational repeatability and documented calibration traceability support GLP-compliant test execution. While not inherently 21 CFR Part 11 compliant, its controller logs timestamped setpoint and actual temperature records in CSV format—enabling manual audit trail generation when paired with validated third-party data acquisition software.
Software & Data Management
The embedded controller provides local HMI operation via a 7-inch color touchscreen with multi-language UI (English, Chinese, Spanish). Real-time data visualization includes trend graphs of chamber setpoint vs. measured temperature, cycle progress indicators, and alarm history review. Data export is supported via USB flash drive (up to 32 GB), with time-stamped .CSV files containing minimum 1-second sampling resolution. Optional RS485 Modbus RTU interface allows integration into centralized SCADA or MES platforms for remote supervision and automated report generation. Firmware updates are performed offline via SD card, ensuring version control integrity without network dependency. No cloud connectivity or proprietary SaaS subscription is required—maintaining full data sovereignty and minimizing cybersecurity surface area.
Applications
- Automotive: Thermal cycling of ADAS control units, infotainment systems, and EV battery management modules per ISO 16750-4 and LV-124.
- Electronics Manufacturing: Burn-in and HALT precursor testing of telecom base station cabinets, industrial PLC enclosures, and medical imaging subsystems.
- Aerospace & Defense: Environmental screening of avionics line-replaceable units (LRUs) per MIL-STD-810H, Method 502.7 (low temperature) and Method 501.7 (high temperature).
- Energy Storage: Pre-conditioning and performance mapping of lithium-ion battery packs under controlled thermal soak conditions prior to electrochemical testing.
- Research & Development: Material behavior studies—including polymer crystallinity shifts, sealant adhesion loss, and solder joint fatigue initiation—under sustained or stepwise thermal exposure.
FAQ
What is the standard warranty period for the OK-STH-8.123m² chamber?
The unit carries a 12-month parts-and-labor warranty from commissioning date, covering all structural components, refrigeration system, heating elements, and controller hardware.
Can this chamber be upgraded to support faster temperature transition rates?
No—the heating rate of 1.0–4.0°C/min is fixed by the installed heater capacity and airflow design. Achieving ≥5°C/min requires factory-level redesign including higher kW heaters, reinforced ductwork, and enhanced compressor sizing; such modifications constitute a new model configuration.
Is the temperature uniformity specification guaranteed under loaded conditions?
The ±3°C uniformity is verified per IEC 60068-3-5 during no-load qualification. Under typical load (≤30% volume occupancy, non-heat-generating samples), deviation remains within ±4°C; users must perform site-specific load mapping if tighter uniformity is required.
Does OK Instruments provide installation and commissioning services?
Yes—standard delivery includes on-site mechanical installation, electrical connection verification, refrigerant charge validation, and operational training. Additional fees apply for crane-assisted placement, utility upgrades (e.g., 3-phase 400V supply), or cleanroom-integrated installations.
Are calibration certificates included with shipment?
A factory-as-built temperature mapping report (9-point sensor grid, per IEC 60068-3-5) is supplied. NIST-traceable calibration certificates for individual sensors require separate purchase and scheduled onsite verification by accredited third-party labs.
