Other Brands OK-TH Series Compact Temperature and Humidity Controlled Environmental Test Chamber

Overview

The OK-TH Series Compact Temperature and Humidity Controlled Environmental Test Chamber is an engineered solution for accelerated environmental stress testing of electronic components, aerospace subsystems, automotive ECUs, polymer materials, and pharmaceutical packaging. Designed around a dual-loop PID-controlled thermodynamic system, it delivers precise, repeatable control of both temperature (–70°C to +150°C) and relative humidity (20–98% RH) within a fully sealed stainless-steel chamber. Its operation adheres to fundamental principles of psychrometric control and vapor compression refrigeration—utilizing a cascade refrigeration architecture for sub-zero capability and a dedicated humidification/dehumidification loop for stable RH modulation. The chamber supports both steady-state and cyclic environmental profiles, enabling compliance-driven validation per MIL-STD-810, IEC 60068, and GB/T 2423 standards.

Key Features

• Microprocessor-based color touchscreen controller with intuitive GUI, supporting seamless English/Chinese language switching and real-time parameter visualization.
• Full SUS#304 stainless-steel construction—interior and exterior—ensuring corrosion resistance, cleanroom compatibility, and long-term dimensional stability under thermal cycling.
• Multi-layer insulated viewing window with integrated indium tin oxide (ITO) conductive film, eliminating condensation and enabling unobstructed visual monitoring during high-humidity operation.
• Dual-stage, low-noise hermetic compressors using environmentally compliant R404A/R23 refrigerant blends, optimized for rapid thermal ramping and extended service life.
• High-integrity sealing system featuring dual-lip high-tensile silicone gaskets between door and frame, achieving leakage rates <0.5% volume/hour under differential pressure conditions.
• Integrated safety architecture including over-temperature, over-humidity, compressor overload, and sensor failure detection—with automatic power isolation and event-stamped fault logging.
• Standard Ø50 mm access port (left-side mounted) with removable rubber plug, rated for Class II insulation and compatible with external power/signal feedthroughs up to 300 VAC.

Sample Compatibility & Compliance

The OK-TH series accommodates samples ranging from PCB assemblies and battery cells to medical device housings and coated optical substrates. Internal dimensions span 40×50×40 cm (80 L) to 100×100×100 cm (1000 L), with optional custom configurations available for non-standard DUT footprints. All models meet the mechanical and climatic test requirements specified in 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). They are also validated against MIL-STD-810G Methods 501.6 (high temperature), 502.6 (low temperature), and 507.5 (humidity), as well as Chinese national standards GB/T 2423.1–2001, GB/T 2423.2–2001, and GB/T 2423.4–1993. For regulated industries, the controller firmware supports audit-ready operation with timestamped setpoint changes, calibration logs, and user-access-level management (admin/operator/guest).

Software & Data Management

The embedded controller provides local data acquisition at 1-second intervals, storing up to 30 days of continuous temperature and humidity traces internally. Optional Ethernet or RS485 interfaces enable integration with centralized laboratory information management systems (LIMS) or SCADA platforms. Data export is supported in CSV format via USB flash drive, with time-synchronized metadata including operator ID, test profile name, and environmental deviation flags. Firmware complies with FDA 21 CFR Part 11 requirements for electronic records when used with password-protected user roles, digital signature prompts, and immutable audit trails—making it suitable for GLP/GMP environments where traceability and data integrity are mandated.

Applications

• Qualification testing of avionics enclosures per DO-160 Section 4 (temperature) and Section 10 (humidity).
• Accelerated aging studies of lithium-ion battery electrolytes under combined thermal-hygrometric stress.
• Validation of moisture barrier performance in flexible OLED encapsulation films (e.g., WVTR correlation studies).
• Pre-conditioning of polymeric medical tubing prior to tensile or biocompatibility assessment (ISO 10993-12).
• Environmental screening of automotive infotainment modules across ISO 16750-4 temperature/humidity profiles.
• Stability testing of diagnostic reagent kits per ICH Q1A(R2) guidelines under intermediate and accelerated storage conditions.

FAQ

What temperature and humidity ranges are standard across all OK-TH models?
All units support 0°C to +150°C and 20–98% RH as base configuration. Extended low-temperature options (–20°C, –40°C, –70°C) and ultra-low RH (5–98% RH) are available as factory-configured options.
Is the controller compliant with FDA 21 CFR Part 11 for electronic recordkeeping?
Yes—the firmware includes role-based access control, electronic signatures, and tamper-evident audit logs required for Part 11 compliance when deployed in validated environments.
Can the chamber be integrated into an existing building management system (BMS)?
Yes, via Modbus RTU (RS485) or TCP/IP (Ethernet) protocols. Integration documentation and register maps are provided upon request.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil and filter-drier replacement is recommended every 24 months under continuous operation; annual verification of refrigerant charge and sensor calibration is advised.
Are calibration certificates included with shipment?
A factory-issued NIST-traceable calibration report for temperature and humidity sensors is supplied standard. UKAS or DAkkS-accredited certificates are available as optional add-ons.