OK-TH Series High-Low Temperature & Humidity Environmental Test Chamber

Overview

The OK-TH Series High-Low Temperature & Humidity Environmental Test Chamber is an engineered solution for accelerated environmental stress testing of electronic components, automotive modules, aerospace subsystems, and industrial materials under rigorously controlled thermal and hygrothermal conditions. Based on the principle of forced-air convection combined with precision vapor compression refrigeration and steam-based humidification, the chamber delivers stable, repeatable, and traceable environmental profiles in compliance with internationally recognized test standards. Its architecture integrates a dual-stage refrigeration circuit for extended low-temperature capability down to −70°C, alongside a high-fidelity humidity generation system enabling precise RH control across wide dynamic ranges. Designed for laboratory and production-line validation environments, the chamber supports both steady-state exposure and programmed cycling protocols—critical for reliability qualification per MIL-STD-810, IEC 60068, and GB/T 2423 series specifications.

Key Features

• Full-color, high-resolution touchscreen controller with intuitive bilingual interface (English/Chinese), supporting real-time parameter monitoring, multi-step program editing, and alarm history review.
• Robust thermal insulation using high-density polyurethane foam (≥100 mm thickness) and vacuum-sealed double-glazed observation window with integrated ITO conductive film for anti-fog clarity during high-humidity operation.
• Dual-stage hermetic compressors (European-manufactured) paired with environmentally compliant R404A/R23 refrigerant blend—optimized for low acoustic emission (<65 dB(A)) and long-term operational stability.
• Seamless SUS#304 stainless steel interior and exterior construction, including welded corners and electropolished surfaces, ensuring corrosion resistance and cleanroom-compatible maintenance.
• Redundant safety architecture: independent over-temperature, over-humidity, compressor high-pressure, and door-open interlock circuits—each triggering audible/visual alarms and automatic power cutoff with event-stamped log entries.
• Standardized Ø50 mm cable port (left-side mounted) with silicone gasket seal, plus two adjustable stainless steel shelves, four casters with locking brakes, and four leveling feet for facility integration.

Sample Compatibility & Compliance

The OK-TH chamber accommodates samples ranging from PCB assemblies and battery packs to sealed enclosures and polymer specimens, with internal dimensions scalable from 80 L to 1000 L. Its performance is validated against key military, industrial, and national standards—including GJB 150.3–1986 (high-temperature), GJB 150.4–1986 (low-temperature), IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), and GB/T 2423.1–2001 / GB/T 2423.2–2001. All temperature and humidity uniformity and fluctuation metrics meet or exceed Class B tolerances defined in IEC 60068-3-5. The system’s design inherently supports GLP-compliant operation through controller audit trails, user access levels, and timestamped calibration records—facilitating FDA 21 CFR Part 11 readiness when deployed with optional software validation packages.

Software & Data Management

The embedded controller supports USB export of test logs (CSV format), real-time graphing of up to six parameters (chamber temp, setpoint, humidity, ramp rate, alarm status, elapsed time), and programmable trigger-based data sampling intervals (1 s to 60 min). Optional PC-based software enables remote monitoring via Ethernet, automated report generation (PDF/Excel), deviation analysis against specification limits, and integration into enterprise LIMS or MES platforms via Modbus TCP or OPC UA protocols. All stored data includes digital signatures, operator ID, and instrument serial number—ensuring full traceability required for ISO/IEC 17025 accredited laboratories.

Applications

This chamber serves as a core platform for thermal cycling validation of avionics hardware, humidity soak testing of moisture-sensitive devices (MSL classification per J-STD-020), accelerated aging of elastomers and adhesives, burn-in screening of power semiconductors, and environmental stress screening (ESS) in electronics manufacturing. It is routinely deployed in R&D labs for material compatibility studies, QA/QC departments for incoming inspection of critical components, and third-party certification bodies performing IEC/EN 60529 IP rating preconditioning and automotive AEC-Q200 stress testing.

FAQ

What temperature and humidity ranges are standard, and which configurations require optional upgrades?

Standard models support −20°C to +150°C and 20–98% RH. Extended low-temperature options (−40°C or −70°C) and ultra-low RH capability (5–98% RH) require upgraded refrigeration circuits and auxiliary dehumidification modules—quoted separately.

Is the controller compatible with external data acquisition systems?

Yes—the built-in RS485 and Ethernet interfaces support Modbus RTU/TCP and optional OPC UA drivers for seamless integration with SCADA, LabVIEW, or custom Python-based DAQ frameworks.

How is calibration traceability maintained?

Each unit ships with a factory calibration certificate traceable to NIST-equivalent national metrology institutes. On-site verification kits (dual-channel calibrated sensors) and annual recalibration services are available under ISO/IEC 17025 scope.

Can the chamber be configured for continuous operation at extreme setpoints?

Yes—continuous operation at −70°C or 98% RH is supported by reinforced insulation, enhanced condensate management, and adaptive compressor staging logic to minimize thermal shock and mechanical fatigue.

Does the system comply with energy efficiency regulations such as EU Ecodesign Directive?

All models meet ErP Lot 11 requirements for climate engineering equipment, featuring variable-speed fans, intelligent defrost cycles, and refrigerant charge optimization to reduce annual power consumption by up to 22% versus legacy single-stage designs.