OK Instruments OK-STH-12m² Walk-in Environmental Test Chamber

Overview

The OK Instruments OK-STH-12m² Walk-in Environmental Test Chamber is an industrial-grade, large-volume environmental simulation system engineered for precise, repeatable, and long-duration thermal and hygrothermal conditioning of bulky or high-batch-volume test specimens. Designed in accordance with fundamental principles of psychrometric control and forced-convection heat transfer, the chamber integrates dual-stage cascade refrigeration, PID-controlled electric heating, and steam-based humidification to deliver stable, uniform, and traceable environmental conditions across its 12 m² floor area and 12 m³ internal volume (2000 × 3000 × 2000 mm). Its architecture supports continuous operation under demanding duty cycles—critical for qualification testing in aerospace, automotive, defense electronics, and pharmaceutical manufacturing where regulatory compliance and process repeatability are non-negotiable.

Key Features

• Robust structural integrity: External cladding of pre-finished color-coated steel panels and interior lining of 1.5 mm thick SUS304 stainless steel ensure corrosion resistance, cleanability, and long-term dimensional stability.
• High-performance insulation: 150 mm composite wall insulation comprising rigid polyurethane foam (λ ≤ 0.022 W/m·K) and glass fiber layers minimizes thermal bridging and achieves low steady-state heat leakage.
• Intelligent climate regulation: YX-880 touchscreen controller with dual-loop PID algorithms manages independent temperature and humidity setpoints, enabling seamless transition between static and cycling profiles—including ramp-hold-soak sequences per IEC 60068-2-14.
• Fail-safe operational redundancy: Integrated protection mechanisms include overtemperature cut-off, phase-loss detection, refrigerant high-pressure shutdown, water-level monitoring for steam generator, and Class B residual-current circuit breaker (RCCB).
• Human-centered accessibility: Full-height observation window with double-glazed, low-emissivity tempered glass provides unobstructed visual monitoring without compromising thermal integrity; wide-opening personnel door with magnetic seal and emergency egress latch complies with ISO 13857 clearance requirements.

Sample Compatibility & Compliance

The chamber accommodates full-system validation of large-format assemblies—including avionics racks, EV battery modules, medical imaging systems, and HVAC components—without disassembly. Its open-plan interior allows flexible fixture mounting and integration with external data acquisition systems via standardized I/O ports. The system conforms to multiple national and international standards governing environmental testing, including GB/T 2423.1 (cold), GB/T 2423.2 (dry heat), GB/T 2423.3 (constant damp heat), GB/T 2423.4 (cyclic damp heat), IEC 60068-2-1 and -2-2, and military specifications GJB 150.3 (high temperature), GJB 150.4 (low temperature), and GJB 150.9 (humid heat). Calibration traceability follows ISO/IEC 17025 guidelines, with optional NIST-traceable sensor validation reports available upon request.

Software & Data Management

The embedded YX-880 controller supports real-time logging of up to 16 channels (temperature, humidity, dew point, alarm status, runtime) at user-selectable intervals (1 s to 60 min). Data export is compatible with CSV and Excel formats via USB interface. Optional Ethernet connectivity enables remote monitoring through OK Instruments’ proprietary WebHMI platform, supporting role-based access control, audit trail generation (aligned with FDA 21 CFR Part 11 requirements), and automated report generation compliant with GLP/GMP documentation workflows. All logged datasets retain time-stamped metadata—including operator ID, calibration certificate numbers, and environmental deviation flags—for full QA traceability.

Applications

This walk-in chamber serves as a primary qualification tool in R&D labs and production QA departments for accelerated life testing, burn-in screening, and environmental stress screening (ESS) of complex electromechanical systems. Typical use cases include thermal aging of polymer enclosures per ASTM D3045, moisture absorption evaluation of composite laminates under cyclic RH loading, pre-conditioning of lithium-ion battery packs prior to safety testing (UN 38.3), and stability assessment of sterile packaging per ISO 11607. Its scalable design permits modular expansion—up to 100 m³ configurations—and integration with auxiliary systems such as solar irradiance simulators or vibration shakers for multi-stress testing environments.

FAQ

What is the maximum allowable load mass for continuous operation at extreme temperatures?
The chamber is rated for sustained operation with up to 300 kg of thermally inert mass at −50 °C or +150 °C, assuming no internal heat dissipation from test articles.
Can the system be validated for IQ/OQ/PQ protocols?
Yes—OK Instruments provides full qualification documentation packages, including URS alignment, FAT/SAT records, sensor mapping reports, and uncertainty budgets per ISO/IEC 17025.
Is remote diagnostics supported?
Standard Ethernet port enables secure remote access via VPN; firmware updates and parameter backup/restore are supported through OK Instruments’ maintenance portal.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil and filter dryer replacement every 24 months; annual inspection of condenser coil cleanliness, refrigerant charge verification, and steam generator descaling.
Are custom interior configurations available?
Yes—options include reinforced floor grids, integrated power distribution units (PDUs), cable pass-throughs with EMI shielding, and configurable lighting zones meeting ISO 14644-1 Class 8 cleanroom illumination standards.