OK OK-STH-8m2.000000 Walk-in Environmental Test Chamber

Overview

The OK OK-STH-8m2.000000 Walk-in Environmental Test Chamber is a large-volume, floor-standing climatic test system engineered for precision simulation of controlled temperature and humidity conditions across extended operational cycles. Designed for industrial validation, reliability engineering, and long-duration environmental stress screening, this chamber employs forced-air convection with dual independent control loops—separate refrigeration, heating, and humidification subsystems—to maintain stable thermal-hygrometric profiles within a 8 m³ internal workspace (2000 mm × 2000 mm × 2000 mm). Its operational envelope spans −50 °C to +150 °C with humidity modulation from 30 %RH to 98 %RH, making it suitable for accelerated aging, storage condition verification, and qualification testing per international environmental test standards. The chamber’s structural integrity is derived from a load-rated steel frame foundation (200 kg/cm² static capacity), insulated panel construction using rigid polyurethane foam (thermal conductivity ≤0.022 W/m·K), and double-skin cladding (external color-coated steel, internal galvanized steel) to ensure dimensional stability, corrosion resistance, and low thermal bridging.

Key Features

• Robust structural design: 6# channel steel base frame welded into grid configuration, supporting full chamber mass, operator access, and test article loading without deflection or deformation
• Double-door access system: Two 1500 mm × 1600 mm hinged doors with marine-grade container latches and silicone-sealed gaskets for pressure-tight operation and minimal leakage
• Integrated air handling unit (AHU): Centralized conditioning cabinet housing centrifugal circulation fans, finned-tube electric heaters, stainless-steel steam humidifiers, and direct-expansion refrigeration coils
• Precision control architecture: Japanese RKC high-resolution PID controller with SSR output driving, real-time auto-tuning, and programmable ramp/soak profiles
• High-fidelity sensing: Class A PT100 platinum resistance thermometers (IEC 60751) and capacitive RH sensors calibrated traceably to NIM standards
• Dual-interface connectivity: RS-232 and RS-485 ports compliant with Modbus RTU protocol for integration into centralized lab monitoring systems or SCADA environments
• Comprehensive safety logic: Over-temperature, over-humidity, refrigerant pressure, door interlock, and phase-failure protection with audible/visual alarm outputs

Sample Compatibility & Compliance

The OK-STH-8m2 accommodates full-size equipment, automotive components, electronic enclosures, medical devices, and batched consumer goods—enabling whole-unit thermal cycling, condensation exposure, and long-term stability assessment. Its performance validation adheres to the latest revisions of key national standards: GB/T 10586–2014 (Humidity Test Chambers), GB/T 10592–2012 (Temperature Test Chambers), and the GB/T 2423 series (Environmental Testing—Parts 1–4 covering dry heat, cold, damp heat steady state, and cyclic damp heat). While not inherently certified to IEC 60068 or ISO 16750, its technical specifications align with the functional requirements of these frameworks when configured with optional data logging and audit trail modules. For regulated industries, optional 21 CFR Part 11-compliant software packages support electronic signatures, user-level permissions, and immutable test record generation.

Software & Data Management

The embedded controller supports up to 100 programmable test profiles, each with up to 99 segments (ramp, soak, cycle). Real-time process variables—including chamber setpoint, actual temperature/humidity, heater/refrigeration status, and alarm history—are displayed on a 7-inch resistive touch HMI with graphical trend overlay. Optional PC-based software (OK-EnviroLog Pro) enables remote supervision via Ethernet, automated report generation (PDF/CSV), deviation alerts via email/SMS, and export of raw time-series data for statistical process analysis (e.g., Cp/Cpk, Weibull). All logged data includes timestamp, operator ID, and instrument calibration status metadata—supporting GLP/GMP documentation workflows where required.

Applications

• Electronics: Burn-in testing of PCBAs, battery thermal management validation, and connector moisture resistance evaluation
• Automotive: ECUs, infotainment systems, and ADAS sensor endurance under combined thermal-hygric stress
• Pharmaceuticals: Stability chamber qualification (ICH Q1A–Q1E), packaging permeability studies, and excipient compatibility screening
• Aerospace: Avionics box qualification per DO-160 Section 4 (Temperature), Section 5 (Humidity), and Section 10 (Altitude)
• Materials Science: Polymer aging kinetics, coating adhesion retention, and composite hygroscopic expansion coefficient measurement
• Quality Assurance: In-house replication of warehouse/storage environment conditions for shelf-life determination

FAQ

What is the maximum allowable ambient temperature for continuous operation?
The chamber requires an ambient environment between 5 °C and 28 °C, with average daily temperature not exceeding 28 °C and relative humidity ≤85 %RH to ensure refrigeration system efficiency and condensate management.
Can the chamber operate at sub-zero temperatures while maintaining high humidity?
Operation below 0 °C with RH >70 % is not recommended due to risk of frost accumulation on sensors and humidifier elements; dehumidification capability is limited in freezing conditions.
Is third-party calibration documentation available upon delivery?
Yes—factory calibration certificates for PT100 sensors and RH transducers are provided, traceable to China National Institute of Metrology (NIM) standards, with optional UKAS-accredited field calibration services.
Does the system support custom test protocols beyond standard GB/T sequences?
Yes—the controller accepts user-defined step-and-hold profiles, including dynamic humidity ramps synchronized with temperature transitions, and supports conditional branching based on real-time sensor feedback.
What maintenance intervals are recommended for optimal long-term performance?
Compressor oil and refrigerant levels should be verified annually; humidifier tanks require weekly descaling; air filters must be cleaned every 15 days; and full system performance verification (uniformity, accuracy, recovery time) is advised biannually per ISO/IEC 17025 guidelines.