OK Instruments OK-STH-8m2.010 Walk-in Environmental Test Chamber

Overview

The OK Instruments OK-STH-8m2.010 Walk-in Environmental Test Chamber is an engineered solution for precise, repeatable simulation of temperature and humidity stress conditions across industrial R&D, quality assurance, and regulatory compliance workflows. Designed around a dual-loop PID-controlled climate system, it maintains stable thermal-hygrometric profiles via independent modulation of refrigeration, heating, and steam-based humidification subsystems. Unlike benchtop chambers, this walk-in configuration enables full-scale testing of assembled components—such as automotive ECUs, aerospace wiring harnesses, or packaged food trays—under sustained exposure to defined environmental extremes. Its architecture complies with foundational requirements of IEC 60068-2, ISO 16750-4 (road vehicles), and ASTM D4332 (conditioning of plastics prior to testing), supporting both accelerated aging studies and long-term stability verification under controlled ambient deviations.

Key Features

• Walk-in footprint (2 m × 2 m × 2 m internal volume) accommodates large-format samples, palletized test loads, or multi-unit concurrent validation—eliminating spatial constraints inherent in cabinet-style chambers.
• Dual-stage refrigeration system utilizing hermetically sealed compressors and environmentally compliant refrigerant blends ensures consistent cooling performance down to −20 °C without oil carryover or thermal shock-induced condensation.
• Steam-generator-based humidification delivers rapid RH ramping (20–98 %RH) with minimal droplet formation, reducing sample surface wetting artifacts during cyclic humidity profiling.
• Stainless steel interior and exterior cladding—combined with high-density polyurethane foam (≥80 mm thickness) and supplementary glass wool insulation—minimizes thermal bridging and achieves ≤0.8 K/m²·K overall U-value.
• Real-time monitoring of chamber air stratification via three fixed-point PT100 sensors (top/mid/bottom) validates temperature uniformity per ISO 16750-4 Annex B and supports GLP-compliant audit trails.
• Modular control interface with Ethernet connectivity enables remote supervision, alarm escalation (SMS/email), and integration into centralized MES or LIMS platforms via Modbus TCP or OPC UA protocols.

Sample Compatibility & Compliance

The OK-STH-8m2.010 accommodates heterogeneous sample geometries—including stacked electronics enclosures, coated metal panels, polymer composites, and sealed consumer packaging—without requiring disassembly or fixture adaptation. Its non-corrosive stainless interior resists degradation from repeated condensation cycles and high-humidity exposure. The chamber meets structural and operational criteria referenced in ISO 16750-4 (environmental conditions for road vehicles), IEC 60068-2-1 (cold), -2-2 (dry heat), -2-30 (damp heat, cyclic), and ASTM D4332 (standard conditioning atmospheres for physical testing). Optional calibration certificates traceable to NIM (National Institute of Metrology, China) are available upon request, supporting internal QA audits and third-party certification submissions (e.g., UL, TÜV, SGS).

Software & Data Management

Built-in OK-EnviroControl™ firmware provides intuitive touchscreen operation with preconfigured test profiles (e.g., “ISO 16750-4 Cycle 1”, “ASTM D4332 Standard Conditioning”), user-defined ramp/soak sequences, and real-time deviation alerts. All sensor data—including temperature, relative humidity, compressor status, and door-open events—is logged at 1-second intervals and stored onboard (≥30 days) with SHA-256 hash integrity verification. Export formats include CSV, PDF summary reports, and encrypted SQLite databases compatible with FDA 21 CFR Part 11–compliant review workflows. Optional OK-DataLink™ software extends functionality with automated report generation, statistical process control (SPC) charting, and role-based access control (RBAC) for multi-user laboratories operating under GMP/GLP frameworks.

Applications

• Accelerated aging of elastomers and thermoplastics to assess dimensional stability, tensile retention, and surface discoloration under combined thermal-hygrometric stress.
• Validation of electronic component reliability per AEC-Q200 and JEDEC JESD22-A110 (temperature cycling) and JESD22-A101 (damp heat).
• Package integrity testing for pharmaceutical primary containers (vials, syringes) under ICH Q5C stability guidelines using defined storage condition profiles.
• Corrosion resistance evaluation of coated steel substrates per ISO 9227 (salt spray) when integrated with optional corrosion module accessories.
• Pre-conditioning of composite materials prior to mechanical testing per ASTM D5229/D5229M, ensuring moisture equilibrium before tensile, flexural, or impact assessment.
• Environmental simulation for battery module thermal runaway propagation studies under controlled ambient humidity gradients.

FAQ

What standards does the OK-STH-8m2.010 comply with for temperature and humidity uniformity verification?

It adheres to ISO 16750-4 Annex B (temperature uniformity ≤ ±2 °C) and IEC 60068-2-30 (humidity uniformity ≤ ±3 %RH), validated using calibrated reference sensors traceable to national metrology institutes.
Can the chamber operate continuously at −20 °C and 95 %RH simultaneously?

Yes—its dual-refrigeration circuit and anti-frost humidification design enable stable operation across the full intersected envelope, including low-temperature high-humidity regimes where condensation management is critical.
Is remote monitoring and data export supported for regulated environments?

Yes—OK-EnviroControl™ firmware supports 21 CFR Part 11–aligned audit trails, electronic signatures, and encrypted data export; optional OK-DataLink™ adds SPC analytics and RBAC for GxP compliance.
What maintenance intervals are recommended for the refrigeration and humidification systems?

Compressor oil and filter replacement every 18 months; steam generator descaling every 3 months under continuous 90 %RH operation; full calibration verification annually or per internal QA schedule.
Does OK Instruments provide installation, commissioning, and IQ/OQ documentation?

Yes—factory-certified engineers perform on-site commissioning, including thermal mapping (per ISO 16750-4), sensor validation, and delivery of executable IQ/OQ protocols aligned with client SOPs.