OK Walk-in Environmental Stress Screening Chamber OK-STH-12.00100m²

Overview

The OK Walk-in Environmental Stress Screening Chamber OK-STH-12.00100m² is an industrial-scale, personnel-accessible environmental test system engineered for accelerated reliability validation under controlled temperature and humidity stress conditions. Unlike standard environmental chambers or non-powered thermal test enclosures, this chamber integrates precision climatic control with full electrical infrastructure—enabling simultaneous application of thermal-hygrometric stress and functional electrical loading. Its operational principle is grounded in physics-based acceleration models (e.g., Arrhenius for temperature-dependent failure mechanisms and Peck’s model for moisture-induced degradation), allowing users to simulate years of field exposure in compressed timeframes. The chamber is specifically designed for continuous, unattended 7×24-hour operation—critical for burn-in, early-life failure screening (ELF), and long-term reliability assessment of electronics subjected to combined thermo-hygrometric and electrical stresses.

Key Features

• Structural integrity: Fully welded stainless steel interior (SUS304) with reinforced multi-tier load-bearing test racks (rated ≥150 kg/m²), optimized for cable routing, thermal airflow management, and safe operator access.
• Precision climate control: Dual-refrigeration cascade system coupled with steam-based humidification and desiccant-assisted dehumidification ensures stable operation across extended ranges: −70°C to +85°C and 20–98% RH, with uniformity maintained at ±3°C (temperature) and ±3% RH (humidity) per IEC 60068-3-5.
• Integrated power management: Dedicated 3-phase AC/DC distribution cabinet with up to 32 independently switched output circuits (configurable for 220 VAC, 380 VAC, or ±12/24/48 VDC), each equipped with real-time current/voltage/power metering and programmable on/off timing sequences.
• Intelligent safety architecture: Redundant over-temperature cutoffs, phase-loss protection, motor overload relays, smoke-sensing triggered emergency exhaust (≥12,000 m³/h capacity), and fail-safe internal door release mechanism compliant with EN 61000-6-4 and UL 61010-1.
• Industrial control platform: Siemens S7-1500 PLC core with HMI touchscreen interface, supporting user-defined test profiles (ramp-soak cycles, step changes, dwell periods), event-triggered actions, and alarm escalation via email/SNMP.

Sample Compatibility & Compliance

The OK-STH-12.00100m² accommodates large-format assemblies—including automotive ECUs, 5G base station cabinets, photovoltaic inverters, and industrial PLC enclosures—up to 1.8 m in height and weighing ≤300 kg per rack level. Its design adheres to the mechanical and environmental test requirements specified in ISO 16750-4 (road vehicles), IEC 60068-2-30 (damp heat, cyclic), and JESD22-A101 (steady-state damp heat). For regulated industries, the system supports 21 CFR Part 11-compliant electronic records through optional audit-trail-enabled software modules, including user access logs, parameter change history, and calibration traceability. All thermal and humidity sensors are NIST-traceable and field-calibratable without chamber disassembly.

Software & Data Management

The embedded control firmware provides native CSV export of all monitored parameters—chamber setpoints, actual sensor readings, power metrics per circuit, alarm events, and runtime statistics—at user-configurable intervals (1 s to 60 min). Optional OK-ESM Suite software extends functionality with remote supervision (HTTPS/SSL), automated report generation (PDF/Excel), statistical process control (SPC) charting (X-bar R, Cpk), and integration with MES/QMS platforms via OPC UA or RESTful API. All data files include embedded metadata (test ID, operator, timestamp, firmware version) and are write-protected post-acquisition to satisfy GLP and GMP documentation integrity requirements.

Applications

This chamber serves as a primary tool for reliability engineering teams validating products intended for harsh ambient environments. Key use cases include: high-temperature/high-humidity burn-in of automotive infotainment systems per ISO 16750-4 Annex D; cyclic damp-heat stress screening of telecom optical transceivers (SFP+/QSFP28) per Telcordia GR-468-CORE; wet-bias life testing of power semiconductors under 85°C/85% RH with applied gate voltage; and accelerated corrosion evaluation of conformally coated PCBAs used in offshore wind converters. It is also deployed in qualification labs for IPC-J-STD-001 and IPC-A-610 conformance verification under humidified reflow simulation protocols.

FAQ

What distinguishes this chamber from a standard walk-in environmental test chamber?
It incorporates a fully integrated, monitored power distribution system and structural provisions for live-load testing—making it purpose-built for reliability stress screening rather than passive environmental simulation.
Can the chamber support custom humidity ramp rates or non-standard cycling profiles?
Yes—the PLC controller accepts user-defined profiles with up to 99 segments, including variable ramp rates, dwell times, and conditional branching based on sensor feedback or elapsed time.
Is remote monitoring and alarm notification supported out of the box?
Standard Ethernet connectivity enables Modbus TCP and HTTP-based status polling; email/SMS alerts require optional OK-ESM Suite licensing.
How is temperature and humidity uniformity validated during commissioning?
Per IEC 60068-3-5, a 9-point sensor mapping grid is deployed across the working volume, with results documented in a certified validation report including uncertainty budgets.
Does the system meet electromagnetic compatibility (EMC) requirements for laboratory installation?
Yes—it complies with EN 61326-1 (industrial EMC) and includes filtered AC input stages, shielded signal cabling, and grounded chassis construction to minimize radiated emissions and susceptibility.