OK ST-H Series Walk-in Environmental Test Chamber
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | OK-STH-4.5m² |
| 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 ST-H Series Walk-in Environmental Test Chamber is a large-volume, room-scale climate simulation system engineered for system-level environmental qualification of high-value industrial assets. Unlike benchtop or upright environmental chambers, this walk-in chamber features an internal volume of 4.5 m³—sufficient to accommodate full-scale automotive components, battery energy storage systems (BESS), avionics racks, or multi-unit production batches. It operates on a dual-control principle: precise thermodynamic regulation via cascade refrigeration and independent humidity control using steam injection or refrigerant-based dehumidification. The chamber is designed for continuous operation under ISO 17025-aligned test conditions and supports compliance-driven validation protocols required in automotive (ISO 16750, SAE J2344), aerospace (RTCA DO-160, MIL-STD-810), and energy storage (UL 9540A, IEC 62619) applications.
Key Features
- Structural integrity: Reinforced steel frame with modular polyurethane-insulated sandwich panels (100–150 mm thickness), achieving thermal conductivity ≤ 0.022 W/m·K and air-tightness per EN 12101-2.
- Multi-stage refrigeration: Dual-cascade compressor system (high-stage R404A / low-stage R23) enabling stable operation down to −70°C without liquid nitrogen dependency.
- High-capacity air handling: Three centrifugal circulation fans with adjustable VFD control ensure temperature uniformity ≤ ±3°C across the entire working volume (per IEC 60068-3-5).
- Large access door: 900 mm wide × 1900 mm high insulated door with double-glazed observation window, anti-frost heating, and electromagnetic safety interlock.
- Integrated humidity control: Steam generator + chilled mirror dew point sensor (±0.5°C accuracy) supporting RH range 20–98% at 25°C; optional low-RH capability via desiccant wheel.
- Industrial-grade control: Siemens S7-1200 PLC with 10.1″ HMI touchscreen, supporting up to 99 programmable segments, ramp/soak profiles, and real-time deviation alarms.
Sample Compatibility & Compliance
The chamber accommodates physically integrated test articles—including electric vehicles (EVs), power electronics cabinets, UAV platforms, and photovoltaic inverters—with maximum dimensional envelope of 1500 mm (D) × 1800 mm (W) × 1500 mm (H). All internal surfaces are electrostatically grounded and ESD-safe (≤ 10⁶ Ω). The system meets structural and operational requirements for GLP-compliant laboratories and supports audit-ready data traceability per FDA 21 CFR Part 11 when paired with OK’s optional validation package (IQ/OQ/PQ documentation, calibration certificates traceable to NIM China). Humidity and temperature performance are verified against ASTM E145 Class II and ISO 17025 clause 5.4.2.
Software & Data Management
OK’s proprietary EnviroLog™ software enables remote monitoring via Ethernet or 4G LTE, with secure HTTPS-based access and role-based user permissions. Data logging records temperature, relative humidity, chamber status, and alarm events at configurable intervals (1 s to 60 min). Raw CSV exports include timestamps with UTC synchronization and digital signatures for integrity verification. Audit trails capture all parameter changes, user logins, and report generation events. Optional integration with LabVantage LIMS or Siemens Desigo CCMS supports enterprise-level test orchestration and automated certificate generation.
Applications
- Automotive: Cold-start validation of EV powertrains at −40°C; HVAC performance mapping across −20°C to +85°C; battery thermal runaway propagation studies under controlled humidity.
- Aerospace: Environmental stress screening (ESS) of flight-critical avionics per RTCA DO-160 Section 4; thermal vacuum pre-screening support.
- Energy Storage: UL 9540A cell-to-module thermal propagation testing; BESS cabinet thermal cycling (−20°C ↔ +55°C, 1000 cycles).
- Data Infrastructure: Thermal load profiling of 19″ server racks under sustained 35°C/85% RH conditions simulating tropical data center environments.
- Manufacturing: High-accelerated stress screening (HASS) for PCB assemblies and power modules using rapid thermal transitions (up to 4°C/min).
FAQ
What is the standard lead time for factory acceptance testing (FAT)?
Typical FAT duration is 5 working days following mechanical completion; scheduling requires 10 business days’ advance notice.
Can the chamber be configured for non-standard temperature/humidity profiles?
Yes—custom profiles including combined thermal-hygric cycling, dwell-and-ramp sequences, and transient load compensation (e.g., simulating internal heat dissipation from active DUTs) are supported via PLC programming.
Is on-site installation and commissioning included?
Standard delivery includes foundation layout guidance, electrical interface specification (380 VAC, 3-phase, 50 Hz, ≥63 A), and remote commissioning support; on-site technician deployment is available as a billable service.
Does the system support third-party calibration and certification?
All sensors (PT100 temperature, capacitive RH, pressure transducers) are individually calibrated and certified to ISO/IEC 17025 standards; calibration certificates are provided with initial delivery and annually thereafter.
How is condensation managed during low-temperature/humidity transitions?
The chamber employs a dynamic dew-point management algorithm that coordinates compressor staging, reheating coils, and drain pan heating to prevent frost accumulation on evaporator surfaces and internal walls.
