OK-TH Series High-Low Temperature Alternating Environmental Test Chamber

Overview

The OK-TH Series High-Low Temperature Alternating Environmental Test Chamber is an engineered solution for simulating dynamic thermal and hygrothermal stress conditions in accordance with international environmental testing standards. Designed for rigorous reliability validation, it employs dual-stage refrigeration architecture and precision-coupled PID control to execute programmable temperature cycling, stepwise ramping, and cyclic humidity profiles—including combined temperature-humidity alternation per IEC 60068-2-30 (Test Db). Its core operational principle relies on thermodynamic equilibrium management via real-time feedback from calibrated Pt100 sensors, integrated with adaptive cold-energy demand allocation algorithms to minimize thermal overshoot and inter-system energy waste. This architecture ensures stable chamber performance across extended test durations—critical for accelerated life testing (ALT), qualification of avionics, automotive ECUs, battery modules, and aerospace composites under MIL-STD-810G and GB/T 2423-compliant protocols.

Key Features

• 7″ full-color TFT LCD touchscreen controller with intuitive graphical interface, supporting English/Chinese language switching and multi-level user access control.
• Fuzzy logic-enhanced temperature and humidity regulation, delivering improved transient response and reduced steady-state error during rapid transitions.
• Twin-stage Bitzer hermetic compressors with R404A/R23 refrigerant blend—optimized for low-noise operation (<65 dB(A)) and consistent cooling capacity down to -70°C.
• Coupled PID humidity control prevents “humidity runaway” during transition phases, enabling precise execution of both constant and cyclic damp heat profiles (e.g., GB/T 2423.4).
• High-fidelity data acquisition: 1-second sampling resolution with onboard non-volatile memory; supports configurable logging intervals from 3 seconds to 1 hour.
• Robust chamber construction using SUS#304 stainless steel for interior and exterior surfaces, ensuring corrosion resistance and long-term dimensional stability.
• Standardized mechanical interface: one Φ50 mm cable port, two load-rated stainless steel shelves, heavy-duty casters with locking mechanism, and adjustable leveling feet.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad range of sample geometries—from PCB assemblies and sensor housings to automotive lighting modules and medical device enclosures—within internal volumes ranging from 80 L to 1000 L. Its uniformity specification (±0.5°C / ±2.5% RH) and stability tolerance (±2.0°C / +2–3% RH) meet the spatial homogeneity requirements defined in IEC 60068-3-5 and MIL-STD-810G Method 502.5. The system is validated for compliance with multiple regulatory frameworks: GJB 150.3 (high-temperature exposure), GJB 150.4 (low-temperature exposure), IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-78 (steady-state damp heat), and IEC 60068-2-30 (cyclic damp heat). While not inherently 21 CFR Part 11 compliant, its audit-ready data logs support GLP/GMP-aligned documentation when integrated with validated third-party LIMS or ELN platforms.

Software & Data Management

The embedded controller provides local data visualization via real-time trend curves and historical playback. All logged parameters—including chamber setpoint, actual temperature/humidity, compressor status, and alarm history—are timestamped and exportable via USB 2.0 to CSV format. Optional Ethernet or RS485 interfaces enable remote monitoring and integration into centralized facility management systems. For laboratories requiring electronic records integrity, optional software packages provide electronic signature capability, role-based permissions, and audit trail generation aligned with ALCOA+ principles. Data retention adheres to ISO/IEC 17025 clause 7.5.2, with automatic backup to external storage media upon power cycle or manual trigger.

Applications

This chamber serves as a foundational tool in product development and quality assurance workflows across regulated and industrial sectors. Typical use cases include: thermal shock pre-screening of semiconductor packaging prior to HAST testing; verification of seal integrity in IP67-rated electronics under repeated condensation cycles; evaluation of polymer coefficient of thermal expansion (CTE) in composite laminates; validation of lithium-ion battery thermal runaway thresholds across charge/discharge states; and environmental stress screening (ESS) of military-grade connectors per MIL-STD-883 Method 1010. Its programmable profile engine supports custom multi-step sequences—such as dwell-ramp-dwell cycles with variable ramp rates—enabling simulation of real-world operational environments including diurnal desert cycles or high-altitude cabin pressure transients.

FAQ

What temperature and humidity ranges are available?

Standard configurations support -70°C to +150°C with humidity from 20–98% RH; extended humidity options (5–98% RH) and alternative temperature spans (e.g., 0°C–150°C) are available upon request.

Does the chamber support automated test sequencing?

Yes—the controller supports up to 100 programmable steps per profile, including ramp, dwell, and loop functions, with independent control of temperature and humidity setpoints.

Is remote monitoring supported out of the box?

USB data export is standard; Ethernet or RS485 communication modules are optional add-ons for SCADA or LabVIEW integration.

What maintenance intervals are recommended for the refrigeration system?

Compressor oil analysis and refrigerant leak checks are advised every 12 months; condenser coil cleaning should occur quarterly in dusty environments.

Can the chamber be validated for IQ/OQ/PQ protocols?

Yes—factory-installed NIST-traceable Pt100 sensors and comprehensive calibration certificates (including uniformity mapping reports) are provided; full 3Q documentation packages are available as a service option.