Programmable Temperature and Humidity Environmental Test Chamber OK-TH Series

Overview

The OK-TH Series Programmable Temperature and Humidity Environmental Test Chamber is an industrial-grade climatic simulation system engineered for precise, repeatable, and traceable environmental stress testing of materials, components, and finished products. Based on forced-air convection and dual-stage refrigeration architecture, the chamber maintains tightly controlled thermal and hygrometric conditions across a wide operational envelope—from deep sub-zero cold to high-temperature dry heat, and from low-humidity desiccation to near-saturation moist environments. Its design adheres to fundamental thermodynamic principles governing psychrometric control, employing calibrated platinum resistance temperature sensors (PT100) and capacitive humidity transducers with automatic dew-point compensation. The system supports both steady-state and dynamic profile-based testing, enabling compliance verification against internationally recognized environmental test standards used in aerospace, automotive, electronics, and medical device qualification.

Key Features

• Modular chamber configurations spanning internal volumes from 80 L to 1000 L (OK-TH-80 through OK-TH-1000), each customizable for non-standard specimen dimensions upon request
• Dual-stage hermetic refrigeration system utilizing R404A (low-temp stage) and R23 (ultra-low-temp stage), ensuring stable cooling performance down to –70 °C without cryogenic consumables
• High-resolution digital control with 0.1 °C / 0.1 %RH resolution and real-time feedback loop tuning, supporting up to 100 programmable steps per test profile
• SUS#304 stainless steel construction throughout—interior chamber walls, shelving, door liner, and ductwork—ensuring corrosion resistance and long-term dimensional stability
• Integrated touch-screen controller with dual-language UI (English/Chinese), USB data export, and password-protected parameter locking for audit-ready operation
• Standard mechanical safety features: over-temperature cut-off, compressor high-pressure protection, humidity sensor self-diagnostic, and door interlock switch

Sample Compatibility & Compliance

The OK-TH chamber accommodates diverse sample geometries via its configurable interior layout, including optional extended-depth variants and reinforced load-bearing shelves rated to 25 kg per shelf. It meets the physical and procedural requirements of multiple international test standards, including MIL-STD-810G Method 502.5 (Temperature), Method 501.5 (High Temperature), and Method 507.5 (Humidity); IEC 60068-2 series for environmental simulation; and corresponding Chinese national standards GB/T 2423.1–2001 (cold), GB/T 2423.2–2001 (dry heat), and GB/T 2423.4–1993 (cyclic damp heat). All units are supplied with factory calibration certificates traceable to NIST-equivalent national metrology institutes. Optional IQ/OQ documentation packages are available to support GLP and ISO/IEC 17025 laboratory accreditation workflows.

Software & Data Management

The embedded controller logs all critical process variables—including chamber setpoint, actual temperature/humidity, ramp rates, dwell times, and alarm events—at user-defined intervals (1 s to 60 min). Data is stored internally for up to 30 days and exportable via USB flash drive in CSV format for post-test analysis in Excel, MATLAB, or LIMS platforms. For enterprise integration, optional RS485 Modbus RTU or Ethernet TCP/IP interfaces enable remote monitoring and centralized fleet management. Audit trail functionality records operator login/logout timestamps, parameter changes, and manual overrides—supporting FDA 21 CFR Part 11 compliance when paired with validated electronic signature modules.

Applications

• Accelerated aging studies of polymer seals, adhesives, and encapsulants under combined thermal-hygrometric stress
• Pre-conditioning of printed circuit boards (PCBs) and semiconductor assemblies prior to solder reflow or reliability screening
• Validation of packaging integrity for sterile medical devices exposed to tropical or arid climate profiles
• Material compatibility testing of lithium-ion battery cells and modules across operational and storage temperature/humidity bands
• Environmental stress screening (ESS) of avionics hardware per DO-160 Section 4 and 5 requirements
• Calibration reference chamber for humidity-sensitive instrumentation requiring traceable RH exposure

FAQ

What is the standard warranty coverage for the OK-TH Series?
The chamber carries a 24-month parts-and-labor warranty from date of commissioning, inclusive of on-site service for major components (compressor, controller, sensor array). Extended warranty and preventive maintenance contracts are available.
Can the chamber be integrated into an existing facility SCADA system?
Yes—via optional Modbus RTU (RS485) or Modbus TCP (Ethernet) communication protocols, enabling read-only access to real-time chamber status and historical trend data.
Is third-party calibration certification included with shipment?
Each unit ships with a factory calibration report covering temperature uniformity, humidity accuracy, and controller linearity, traceable to CNAS-accredited laboratories. Full ISO/IEC 17025 calibration with uncertainty budgets is available as a value-added service.
Are custom interior modifications supported, such as additional ports or specialized shelving?
Yes—custom engineering services include non-standard port configurations (e.g., multiple Ø30 mm or Ø80 mm feedthroughs), reinforced load platforms, and inert gas purge interfaces (N₂ or dry air) for oxygen-sensitive applications.
How is humidity control achieved at low temperatures (e.g., below 0 °C)?
The system employs chilled mirror dew-point control combined with steam humidification and precision PID modulation of ultrasonic mist output, maintaining stable RH down to –40 °C with minimal frost accumulation on sensor surfaces.