OK-TH Series Temperature and Humidity Controlled Environmental Test Chamber

Overview

The OK-TH Series Temperature and Humidity Controlled Environmental Test Chamber is an engineered solution for accelerated environmental stress testing of electronic components, aerospace hardware, automotive modules, electrical enclosures, coatings, and polymer-based materials. Designed in accordance with fundamental principles of thermodynamic equilibrium and psychrometric control, the chamber maintains precise, reproducible temperature and humidity profiles across extended operational cycles. Its dual-stage refrigeration architecture—utilizing R404A and R23 refrigerants—enables stable operation from -70 °C to +150 °C while sustaining humidity levels between 20 %RH and 98 %RH. The system’s thermal mass management, airflow optimization via rear-mounted centrifugal fans, and high-efficiency heat exchangers ensure uniform chamber conditions per ISO 16750-4, IEC 60068-2-1, IEC 60068-2-2, and IEC 60068-2-30 requirements. It serves as a foundational platform for qualification testing under MIL-STD-810G, DO-160G, and automotive OEM-specific climate protocols.

Key Features

• 7-inch full-color capacitive touchscreen controller with real-time graphing, programmable ramp/soak profiles, and seamless English/Chinese language switching
• SUS#304 stainless steel construction—both interior chamber and outer housing—resistant to corrosion, thermal fatigue, and cleaning agents used in GMP-compliant facilities
• Multi-layer observation window with integrated conductive film heating to prevent condensation and ensure unobstructed visual monitoring during high-humidity cycles
• Dual-stage hermetic compressor system compliant with EU F-Gas Regulation (EU No. 517/2014), optimized for low acoustic emission (<65 dB(A) at 1 m)
• Double-gasketed door seal using high-tensile silicone elastomer rated for continuous operation from -70 °C to +150 °C
• Standard 50 mm diameter cable/port access on left wall, fitted with removable blanking plate and silicone grommet for EMI-safe signal/power feedthrough
• Integrated safety architecture: independent over-temperature cutoff, humidity sensor failure detection, refrigerant pressure monitoring, and automatic power disconnection upon fault condition

Sample Compatibility & Compliance

The OK-TH chamber accommodates samples up to 1000 L internal volume (OK-TH-1000 model), supporting DUTs ranging from PCB assemblies and battery packs to full-scale automotive ECUs and medical device housings. Its chamber geometry and forced-air circulation meet ASTM E145 Class II performance criteria for uniformity and stability. All models are factory-verified against national and international standards including GB/T 2423.1–2423.4, GB/T 10586, GJB 150.3/4/9, and ISO 16750-4. Optional calibration certificates traceable to NIM (China National Institute of Metrology) or UKAS-accredited labs are available upon request. For regulated industries, the controller supports audit trail logging and user-level access control compatible with GLP/GMP documentation workflows.

Software & Data Management

The embedded controller provides native data logging at user-selectable intervals (1 s to 60 min), storing up to 100 test programs with 100 segments each. Exportable CSV files include timestamped temperature, humidity, setpoint, and alarm status columns. Optional PC-based software (OK-Link v3.2) enables remote supervision via Ethernet or RS485, real-time dashboard visualization, automated report generation (PDF/Excel), and integration with LabVIEW™ and MATLAB® through TCP/IP API. Data integrity complies with FDA 21 CFR Part 11 requirements when configured with electronic signature and role-based permissions.

Applications

• Environmental stress screening (ESS) of printed circuit boards and solder joints per IPC-9701
• Accelerated life testing of lithium-ion battery cells under combined thermal and humidity cycling
• Validation of ingress protection (IP) ratings for outdoor-rated electronics
• Material compatibility testing of adhesives, encapsulants, and conformal coatings under cyclic humidity exposure
• Pre-conditioning of sensors and optical components prior to functional testing
• Stability assessment of pharmaceutical packaging under ICH Q1A(R2) climatic zone conditions

FAQ

What is the standard warranty coverage for the OK-TH series?

All units include a 24-month parts-and-labor warranty covering refrigeration system, controller, and structural components. Extended service plans with on-site calibration and preventive maintenance are available.

Can the chamber be customized for non-standard temperature/humidity ranges?

Yes—custom configurations down to -80 °C or up to +200 °C, and humidity extension to 5 %RH or 98 %RH with optional steam humidification or desiccant drying modules, are supported upon engineering review.

Is the controller compliant with FDA 21 CFR Part 11 for electronic records?

The base controller meets ALCOA+ data integrity principles; full Part 11 compliance requires activation of optional audit trail, electronic signature, and 21 CFR Part 11 configuration package.

How is traceable calibration performed post-installation?

NIST-traceable PT100 sensors and chilled mirror hygrometers are used during factory calibration. Field recalibration kits and third-party certification services (e.g., TÜV, SGS) are available.

What power infrastructure is required for the OK-TH-1000 model?

AC 380 V ±5 %, 3-phase 5-wire, 50 Hz ±0.5 Hz, minimum 25 kVA supply capacity with dedicated grounding conductor meeting IEC 61000-4-5 surge immunity requirements.