OK 0K-STH-4.55m² Walk-in Environmental Test Chamber
| Brand | OK |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic |
| Model | 0K-STH-4.55m² |
| Internal Dimensions (D×W×H) | 1500 × 1800 × 1500 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 0K-STH-4.55m² Walk-in Environmental Test Chamber is a large-volume, floor-standing climate simulation system engineered for system-level environmental reliability validation. Unlike benchtop or upright chambers, this walk-in unit features an internal usable volume of 4.55 m³ (1500 × 1800 × 1500 mm), enabling direct human access for setup, instrumentation, real-time monitoring, and intervention during extended thermal testing cycles. It operates on a dual-stage cascade refrigeration architecture—comprising high-temperature and low-temperature compressor circuits—to achieve stable, uniform temperature control across its full operational range (from −70°C to +85°C, depending on configuration). The chamber’s structural integrity derives from a reinforced steel frame and insulated sandwich panels with high-density polyurethane (PU) core, ensuring thermal resistance (U-value ≤ 0.25 W/m²·K) and long-term dimensional stability under repeated thermal cycling. Air distribution is managed via a high-capacity centrifugal circulation system with strategically positioned ducts and diffusers, maintaining spatial temperature uniformity within ±3°C throughout the working volume per IEC 60068-3-5 and ASTM E145-21 requirements.
Key Features
- Walk-in architecture with personnel-accessible interior and safety-rated insulated door (equipped with observation window, anti-frost heater, and interlocked mechanical latch)
- Modular panel construction using double-skin galvanized steel with 120 mm thick PU insulation (λ ≈ 0.022 W/m·K), facilitating field assembly, expansion, and maintenance
- Cascade refrigeration system supporting operation down to −70°C; optional LN₂ assist available for accelerated cooldown profiles
- Precision PID-controlled electric heating system with redundant overtemperature protection (dual independent sensors + mechanical cut-off)
- Programmable PLC-based controller with 10.4″ color touchscreen, supporting up to 99 segments per profile, ramp/soak logic, and real-time deviation alarms
- Integrated test ports (6 × Φ50 mm, sealed with silicone grommets) for power, signal, and sensor feedthrough without compromising chamber integrity
- Compliance-ready data logging: time-stamped temperature traces stored locally (≥30 days) and exportable via USB or Ethernet; audit trail enabled per FDA 21 CFR Part 11 requirements when paired with OK’s optional validation package
Sample Compatibility & Compliance
This chamber accommodates full-scale assemblies unsuitable for conventional enclosures—including electric vehicle battery packs (up to 2.5 m in length), avionics racks, photovoltaic inverters, telecom base station cabinets, and aerospace subsystems. Its design conforms to key international standards governing environmental testing infrastructure: IEC 60068-2-1 (Cold), IEC 60068-2-2 (Dry Heat), IEC 60068-2-14 (Change of Temperature), and ISO 16750-4 (Road Vehicles – Environmental Conditions). Structural load capacity exceeds 500 kg/m² floor loading, and electrical interface supports three-phase 380 VAC ±10%, 50 Hz input with dedicated grounding. Optional humidity control (±2% RH accuracy) and rapid thermal transition modules (up to 10°C/min) are available under separate model variants compliant with MIL-STD-810H Method 502.7.
Software & Data Management
The embedded OK-EnviroControl™ firmware provides intuitive profile programming, multi-channel real-time monitoring (up to 8 external thermocouple inputs), and automated report generation (PDF/CSV). Remote supervision is supported via Modbus TCP or OPC UA protocols, allowing integration into enterprise MES or LIMS platforms. All recorded data include immutable timestamps, operator ID, and version-tracked calibration metadata. For regulated industries, the optional OK-Validation Suite delivers IQ/OQ documentation templates, uncertainty budgets per ISO/IEC 17025, and electronic signature capability aligned with GLP and GMP Annex 11 expectations.
Applications
- Automotive: Whole-vehicle cold soak and HVAC performance verification at −40°C; battery thermal management system (BTMS) validation under dynamic load conditions
- Aerospace: Environmental stress screening (ESS) of flight-critical avionics; thermal vacuum pre-screening for satellite payload modules
- Energy Storage: Cycle-life testing of grid-scale BESS cabinets under combined thermal and charge/discharge stress
- Telecom & Data Centers: Thermal mapping of 19″ rack-mounted servers under sustained 45°C ambient; airflow resistance analysis using integrated anemometry ports
- Industrial Electronics: HASS (Highly Accelerated Stress Screening) qualification of rail signaling controllers per EN 50125-1
- Materials Science: Batch aging of polymer composites and sealants under controlled thermal gradients per ASTM D3045
FAQ
What is the maximum allowable heat load from DUTs during operation?
The standard configuration supports up to 5 kW of continuous internal heat dissipation. Higher loads require custom evaporator sizing and airflow recalibration—please provide DUT power consumption and thermal output profile during quotation.
Can the chamber be relocated or expanded after installation?
Yes. The modular panel system uses cam-lock fasteners and standardized corner posts, enabling disassembly, transport, and reconfiguration—including volume extension by adding additional wall sections.
Is on-site installation and commissioning included?
Standard delivery includes factory pre-commissioning and full on-site installation by OK-certified engineers, including refrigerant charging, controller calibration, and performance verification per ISO 17025 traceable procedures.
How is temperature uniformity verified and maintained over time?
Uniformity is validated using a 9-point sensor array per IEC 60068-3-5. Annual recalibration services include thermal mapping, sensor drift assessment, and fan performance diagnostics—all documented in a certified compliance report.
Does the system support remote validation for FDA or ISO audits?
With the OK-Validation Suite add-on, full electronic audit trails, calibration certificates, and change control logs are generated and exportable in PDF/A-1b format compliant with FDA 21 CFR Part 11 and EU Annex 11 requirements.
