English Product Name

Overview

The OK-TH Series Environmental Stress Screening Chamber is an engineered solution for accelerated reliability testing under controlled temperature and humidity cycling conditions. Designed for compliance-driven laboratories and industrial quality assurance departments, this chamber implements precise thermodynamic control via a dual-stage refrigeration system and high-fidelity PID-based humidity regulation. Its operational principle relies on closed-loop feedback control of saturated steam injection, combined with electric heating and cascade compression cooling, enabling reproducible simulation of real-world environmental stress profiles—including rapid transitions between sub-zero cold soak, high-temperature bake-out, and condensing humid phases. The chamber meets the thermal and hygrometric performance requirements defined in MIL-STD-810G, IEC 60068-2 series, and China’s GB/T 2423 and GJB 150 standards—making it suitable for qualification testing of electronic assemblies, aerospace components, automotive ECUs, and medical device enclosures under environmental stress screening (ESS) and highly accelerated life testing (HALT) protocols.

Key Features

• Full-color 7-inch TFT touchscreen controller with intuitive graphical interface and real-time trend display; supports seamless English/Chinese language switching for multinational lab environments.
• Robust chamber construction using double-walled SUS#304 stainless steel for both interior and exterior surfaces—ensuring corrosion resistance, structural integrity, and long-term dimensional stability under repeated thermal cycling.
• Multi-layer observation window with integrated conductive film heating to prevent condensation, enabling unobstructed visual monitoring of test samples without compromising chamber seal integrity.
• High-efficiency hermetic dual-stage refrigeration system utilizing environmentally compliant R404A/R23 refrigerant blend, optimized for stable operation across the full -70°C to +150°C range.
• Dual independent safety layers: hardware-level thermal cutoffs (mechanical over-temperature protector) and software-based fault detection with automatic power disconnection and on-screen diagnostic reporting.
• Standard 50 mm diameter test port located on the left side wall, fitted with silicone gasket and stainless-steel flange—compatible with external power feeds, sensor leads, or pneumatic lines under pressure-tight conditions.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad range of sample geometries through six standard internal volume configurations—from 80 L to 1000 L—and supports custom internal dimensioning upon request. Its uniformity specification (±0.5°C temperature, ±2.5% RH humidity) and tight fluctuation control (±2°C, +2–3% RH) ensure metrological consistency required for GLP-compliant testing. All models are verified against IEC 60068-2-30 (cyclic damp heat), IEC 60068-2-1/-2 (cold/dry heat), and MIL-STD-810G Method 501.6/502.6. Traceable calibration documentation and factory verification reports are provided per unit. The chamber architecture permits integration into ISO/IEC 17025-accredited testing workflows when paired with validated procedures and third-party sensor calibration.

Software & Data Management

The embedded controller logs time-stamped temperature and humidity data at user-defined intervals (1 s to 60 min resolution) and stores up to 100 test programs with 99 segments each. Data export is supported via USB flash drive in CSV format for post-processing in Excel or statistical analysis platforms. Optional Ethernet or RS485 interfaces enable remote monitoring and integration with laboratory information management systems (LIMS). Audit trail functionality complies with FDA 21 CFR Part 11 requirements when used with optional user authentication and electronic signature modules. Firmware updates are performed via secure USB-based protocol with version rollback capability.

Applications

• Environmental qualification of printed circuit board assemblies (PCBAs) per IPC-J-STD-004 and IPC-9701.
• Thermal shock and moisture sensitivity level (MSL) evaluation of semiconductor packages in accordance with JEDEC J-STD-020.
• Validation of sealing integrity and material degradation in automotive lighting modules, battery housings, and ADAS sensors.
• Stability assessment of pharmaceutical packaging under ICH Q1A(R2) climatic zone IV conditions.
• Pre-conditioning of composite materials prior to mechanical or electrical property measurement per ASTM D5229/D3045.

FAQ

What temperature and humidity ranges are available across OK-TH models?

Standard configurations support four temperature base ranges: 0–150°C (Model A), -20–150°C (Model B), -40–150°C (Model C), and -70–150°C (Model D); humidity range is 20–98% RH as standard, with extended 5–98% RH available as optional configuration.

Is the chamber compatible with automated test sequencing and external SCADA systems?

Yes—RS485 Modbus RTU and optional Ethernet TCP/IP communication protocols are supported for bidirectional command exchange and real-time parameter readback.

How is traceability ensured for regulatory audits?

Each unit ships with NIST-traceable calibration certificates for temperature and humidity sensors; firmware includes configurable audit trail logging with user login, action timestamp, and parameter change history.

Can the chamber be operated continuously for extended duration tests?

Designed for 24/7 operation under nominal load, the chamber features redundant compressor oil management, continuous condensate drainage, and thermal overload protection—validated for uninterrupted 1000-hour cyclic test profiles.

What maintenance intervals are recommended for optimal performance?

Compressor oil inspection every 12 months; refrigerant leak check annually; chamber door gasket cleaning and visual inspection quarterly; full system calibration recommended every 12 months or after 2000 operating hours.