OK STAND-ALONE WALK-IN ENVIRONMENTAL TEST CHAMBER OK-STH-4m2.245

Overview

The OK STAND-ALONE WALK-IN ENVIRONMENTAL TEST CHAMBER OK-STH-4m2.245 is an industrial-grade, fully enclosed walk-in environmental simulation system engineered for long-duration, high-fidelity thermal and humidity conditioning of large-scale test articles—including complete electronic assemblies, automotive modules, aerospace subcomponents, and medical device enclosures. Unlike benchtop chambers, this chamber employs a dual-mode air-handling architecture with independent refrigeration and steam-based humidification subsystems, operating on the principle of forced-air convection with multi-point feedback control. Its structural design conforms to ISO 16750-4 (road vehicles), IEC 60068-2 (environmental testing), and MIL-STD-810H (method 502.7 & 507.6) requirements for temperature and humidity exposure profiles. The chamber supports both steady-state operation and programmable ramp-soak cycles, enabling compliance verification against GB/T 2423.1–2423.4, GB/T 2423.22, GB/T 2423.34, and GB 150.9—Chinese national standards aligned with IEC 60068 series.

Key Features

• Modular double-skin insulated panel construction using flame-retardant B2-class EPS, polyurethane, or rock wool core (panel thickness options: 50/60/70/100 mm; outer cladding: 0.326 mm or 0.5 mm pre-painted steel or stainless steel)
• Structural reinforcement via galvanized steel frame and aluminum extrusion perimeter support system, ensuring dimensional stability under repeated thermal cycling
• Hermetic sealing at all panel joints with neutral-cure silicone sealant (ASTM C920 compliant), minimizing air leakage and maintaining internal humidity integrity
• Front-access observation window with double-glazed, low-emissivity tempered glass and anti-fogging heating element for real-time visual monitoring without thermal disturbance
• Dual-stage refrigeration circuit with automatic refrigerant path selection—enabling direct compressor start-up during high-temperature soak phases without mechanical delay or thermal shock
• Integrated safety interlocks: leakage current circuit breaker, over-temperature cut-off (dual redundant sensors), phase-loss protection, and deionized water level monitoring for steam generator
• Touchscreen HMI (7-inch LCD) with embedded PLC controller supporting up to 99 programmable segments per profile, including ramp, soak, and step-cycle logic

Sample Compatibility & Compliance

The OK-STH-4m2.245 accommodates full-system DUTs up to 1.5 m depth × 1.8 m width × 1.5 m height, with floor loading capacity rated at 500 kg/m² (reinforced concrete base recommended). It supports non-destructive in-chamber cabling via multiple NEMA 4X-rated feedthrough ports (optional IP65 gland kits available). All electrical components comply with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emission) standards. Humidity control spans 20–98% RH (non-condensing) with ±3% RH uniformity across working volume, verified per ISO 12048:1997. Chamber validation documentation includes IQ/OQ protocols aligned with GLP and GMP Annex 15 expectations; optional calibration certificates traceable to NIM (National Institute of Metrology, China) are available upon request.

Software & Data Management

The embedded control system logs temperature and humidity data at user-defined intervals (1–600 seconds) with onboard storage for ≥30 days of continuous operation. Export formats include CSV and PDF reports compatible with LIMS integration. Optional Ethernet/Wi-Fi connectivity enables remote supervision via secure HTTP(S) interface or Modbus TCP protocol for SCADA-level integration. For regulated environments, the optional OK-DataTrace module provides 21 CFR Part 11-compliant audit trails—including operator ID, parameter change history, alarm event timestamps, and electronic signature capability—meeting FDA, EMA, and MHRA data integrity expectations. Data encryption (AES-256) and role-based access control (RBAC) ensure confidentiality and accountability.

Applications

This chamber serves as a primary qualification tool in product development and quality assurance workflows across multiple sectors: accelerated life testing of battery packs under thermal stress; thermal aging of polymer housings per UL 746C; environmental screening of avionics enclosures per DO-160G Section 4 & 5; shelf-life validation of sterile medical packaging under ISO 11607-1; and climatic stress screening of photovoltaic inverters per IEC 62109-2. Its large internal volume also facilitates simultaneous multi-unit testing—reducing per-unit cycle time and improving statistical confidence in batch-level reliability assessments.

FAQ

What is the maximum allowable ambient temperature for stable operation?
The chamber is rated for continuous operation in ambient conditions up to 35 °C and 80% RH. Above these limits, cooling capacity may be reduced; optional external condenser cooling water loop or rooftop heat rejection system can be specified.
Can the chamber be validated for ISO/IEC 17025 accredited testing labs?
Yes—OK Instruments provides full validation support packages including certified reference sensor placement diagrams, uncertainty budgets per GUM (JCGM 100), and documented metrological traceability to national standards.
Is custom interior lighting or power distribution available?
Standard configuration includes LED task lighting and four 20A/220V AC outlets. Custom configurations—such as explosion-proof lighting (ATEX Zone 2), 400V three-phase busbars, or DIN-rail mounted DC power supplies—are available upon engineering review.
How is humidity generated and controlled?
Humidity is generated via electrically heated deionized water steam generator with PID-controlled saturation valve; measurement uses capacitive RH sensors calibrated against chilled-mirror hygrometers per ISO 4677.
Does the chamber support rapid thermal cycling per JEDEC JESD22-A104?
While optimized for stability, the OK-STH-4m2.245 achieves 3 °C/min heating and 1 °C/min cooling rates—suitable for less aggressive thermal shock profiles. For JEDEC-compliant 15 °C/min cycling, OK offers the parallel-series STH-R series with liquid nitrogen assist.