Environmental Test Chamber – OK-TH Series Temperature and Humidity Controlled Chamber

Overview

The OK-TH Series Temperature and Humidity Controlled Chamber is an engineered environmental test system designed for precise simulation of thermal and hygrothermal stress conditions in accordance with international standards for reliability validation and quality assurance. Based on the principle of forced-air convection combined with dual-stage refrigeration and PID-controlled steam humidification, this chamber delivers stable, repeatable, and traceable environmental profiles across a wide operational envelope. It is widely deployed in R&D laboratories and QC departments within aerospace, automotive electronics, consumer appliance manufacturing, defense subcontracting, and materials science research—where compliance with MIL-STD, IEC, and GB/T environmental test protocols is mandatory. The chamber’s architecture integrates thermodynamic stability with operational safety, enabling long-duration testing of components under defined temperature-humidity cycling, steady-state exposure, or accelerated aging regimes.

Key Features

• Industrial-grade microprocessor-based color touchscreen controller supporting real-time bilingual (English/Chinese) operation and intuitive parameter programming.
• Multi-layer insulated observation window with embedded conductive film heating to prevent condensation and ensure unobstructed visual monitoring during high-humidity tests.
• Full SUS#304 stainless steel construction for both inner and outer chambers—resistant to corrosion, oxidation, and chemical exposure typical in extended humidity testing.
• Dual-layer high-tension silicone door gasket ensuring leak-tight sealing and minimizing thermal bridging at the access interface.
• Standard 50 mm diameter test port located on the left side wall, pre-fitted with removable rubber plug—compatible with external sensor leads, power feeds, or data acquisition cables.
• Integrated safety architecture including over-temperature, over-humidity, compressor overload, and phase failure detection—all triggering immediate alarm display and hardware-level power isolation.
• Hermetically sealed, low-noise dual-stage refrigeration unit utilizing environmentally compliant refrigerant blends (R404A/R23), optimized for rapid cooling down to −70°C without oil migration or freeze-up risk.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad spectrum of physical samples—from printed circuit boards and lithium-ion battery modules to polymer composites, optical coatings, and packaged pharmaceuticals—without compromising environmental fidelity. Its internal volume scalability (80 L to 1000 L) supports both small-component qualification and full-assembly environmental screening. All models are factory-calibrated and documented to meet traceability requirements under ISO/IEC 17025-accredited metrology practices. Regulatory alignment includes full support for test execution per GJB 150.3–1986 (high-temperature), GJB 150.4–1986 (low-temperature), IEC 60068-2-78 (steady-state damp heat), and IEC 60068-2-30 (cyclic damp heat). For GLP/GMP environments, optional audit trail logging and user-access control modules are available to satisfy FDA 21 CFR Part 11 electronic record integrity criteria.

Software & Data Management

The embedded controller provides local data logging at configurable intervals (1–60 seconds), storing up to 100 test programs with individual step definitions (ramp rates, dwell times, humidity setpoints). Export is supported via USB flash drive in CSV format for post-processing in MATLAB, Excel, or LIMS platforms. Optional Ethernet or RS-485 interfaces enable remote supervision through SCADA-compatible systems or custom LabVIEW-based monitoring dashboards. Firmware updates are performed offline via SD card, ensuring continuity in regulated production environments where network connectivity is restricted.

Applications

• Accelerated life testing of automotive ECUs under combined thermal cycling and humidity soak conditions.
• Qualification of avionics enclosures per DO-160 Section 4 (temperature) and Section 5 (humidity).
• Stability assessment of moisture-sensitive medical device packaging per ISO 11607-1.
• Validation of coating adhesion and blister resistance in architectural paints per ASTM D714 and ISO 4628-2.
• Pre-conditioning of lithium battery cells prior to charge/discharge cycle testing (UN 38.3, Section 38.3.4.1).
• Environmental stress screening (ESS) of PCB assemblies in electronics manufacturing lines.

FAQ

What temperature and humidity ranges are standard across the OK-TH series?
Standard configurations offer temperature spans from 0°C to 150°C, −20°C to 150°C, −40°C to 150°C, or −70°C to 150°C; humidity range is 20–98% RH, with optional extension to 5–98% RH upon request.

Is the chamber suitable for continuous operation at extreme low temperatures?
Yes—the dual-stage refrigeration system and optimized insulation design support uninterrupted operation at −70°C for durations exceeding 1,000 hours, validated per IEC 60068-2-1 and GJB 150.4.

Can test data be exported for regulatory submission?
Yes—CSV-formatted logs include timestamps, setpoints, actual values, and event flags; optional firmware upgrade enables electronic signature and audit trail generation compliant with FDA 21 CFR Part 11.

Are calibration certificates included with shipment?
Each unit ships with a factory calibration report referencing NIST-traceable standards; ISO/IEC 17025-certified third-party calibration services are available as an add-on.

What maintenance intervals are recommended for long-term reliability?
Compressor oil inspection every 2,000 operating hours; refrigerant pressure verification annually; door seal integrity check quarterly; and full system performance validation every 12 months or per internal QA schedule.