English Product Name

Overview

The OK-TH Series Rapid Temperature Change Environmental Test Chamber is an engineered solution for accelerated thermal stress screening of electronic components, automotive modules, aerospace subsystems, and industrial materials. It operates on the principle of controlled, high-rate thermal cycling—inducing repetitive expansion and contraction in test specimens to expose latent defects including microcracks in solder joints, interfacial delamination in laminated composites, coefficient-of-thermal-expansion (CTE) mismatch failures, and moisture-related degradation mechanisms such as popcorning in plastic-encapsulated microcircuits. Unlike standard temperature-humidity chambers, the OK-TH series delivers programmable ramp rates up to 25 °C/min across a wide operational envelope (−70 °C to +150 °C; 20–98 %RH), enabling compliance-driven qualification per MIL-STD-810H Method 503.5 (Temperature Shock), IEC 60068-2-14 (Change of Temperature), and JEDEC JESD22-A106 (Thermal Shock). Its dual-stage refrigeration architecture ensures stable low-temperature hold capability while maintaining humidity control integrity at sub-zero dew points.

Key Features

• Programmable rapid thermal transition profiles with selectable ramp rates (5, 10, 15, 20, or 25 °C/min) across user-defined upper/lower limits
• Integrated humidity control system with precision steam generator and solid-state humidity sensor, supporting both steady-state and dynamic RH cycling
• SUS304 stainless steel interior and insulated double-wall construction with polyurethane foam (≥100 mm thickness) for thermal efficiency and condensation suppression
• Hermetically sealed dual-stage refrigeration circuit using environmentally compliant R404A (high-temp stage) and R23 (low-temp stage), optimized for rapid pull-down and recovery
• Intuitive 7-inch color touchscreen controller with real-time graphing, multi-segment profile programming, and built-in data logging (≥10,000 hours)
• Comprehensive safety architecture: over-temperature/over-humidity cutoffs, refrigerant pressure monitoring, door interlock, and independent mechanical thermostat backup

Sample Compatibility & Compliance

The OK-TH chamber accommodates samples ranging from PCB assemblies and battery packs to structural composite coupons and medical device enclosures. Internal dimensions scale from 225 L to 1000 L (50×75×60 cm to 100×100×100 cm), with optional removable shelves, cable ports (φ50/φ100 mm), and internal lighting. The system meets critical regulatory and industry standards including GB/T 2423.1–2023 (Cold Testing), GB/T 2423.2–2023 (Dry Heat), GB/T 2423.22–2012 (Temperature Change), GJB 150.3A–2009 (High Temperature), GJB 150.4A–2009 (Low Temperature), and GJB 150.5A–2009 (Temperature Shock). Optional validation packages support IQ/OQ documentation aligned with ISO/IEC 17025 and GLP-compliant audit trails.

Software & Data Management

The embedded controller supports local data storage (SD card or internal flash) with timestamped temperature/humidity logs at configurable intervals (1–60 s). Optional PC-based software enables remote monitoring via Ethernet or RS485, automated report generation (PDF/CSV), and integration into enterprise LIMS or MES platforms. Audit trail functionality complies with FDA 21 CFR Part 11 requirements when configured with user-level access control, electronic signatures, and immutable log archiving. All firmware updates are performed via secure USB or network interface with version rollback capability.

Applications

• Qualification testing of avionics hardware per DO-160 Section 4 (Temperature Variation)
• Reliability screening of EV battery modules under combined thermal-humidity stress (e.g., UN 38.3 T5)
• Process validation for conformal coating adhesion and curing stability
• Material compatibility assessment of seals, gaskets, and elastomers exposed to cyclic thermal gradients
• Failure analysis root cause isolation in field-return units exhibiting intermittent faults
• Pre-compliance environmental stress screening prior to formal certification testing

FAQ

What is the maximum achievable ramp rate under full-load conditions?

Up to 25 °C/min is guaranteed for empty chambers; actual ramp performance under load depends on specimen mass, thermal mass, and placement geometry—typically reduced by 10–20 % for 10 kg representative loads.

Can the chamber operate continuously at −70 °C with 20 %RH?

Yes—its dual-stage refrigeration and dedicated dehumidification loop enable simultaneous ultra-low temperature and low-humidity operation without ice accumulation or sensor drift.

Is third-party calibration and validation support available?

Yes—factory-trained engineers provide on-site IQ/OQ execution, NIST-traceable sensor calibration, and uncertainty budget documentation per ISO/IEC 17025.

Does the controller support custom alarm logic and email/SMS notifications?

Standard configuration includes relay outputs for external alarm integration; optional Ethernet module enables SMTP-based alerting with user-defined thresholds and escalation protocols.

What is the expected service life of the refrigeration system under daily 8-hour operation?

With scheduled preventive maintenance (oil analysis, filter replacement, refrigerant purity checks every 12 months), mean time between failures exceeds 25,000 operating hours.