Environmental Test Chamber – High-Low Temperature & Humidity Cycling Chamber OK-TH Series

Overview

The OK-TH Series Environmental Test Chamber is an engineered solution for high-fidelity thermal and humidity stress testing of electronic components, aerospace hardware, automotive ECUs, industrial control systems, and materials subjected to real-world climatic exposure. Based on the principle of forced-air convection with precision-controlled refrigeration and steam-based humidification, this chamber delivers repeatable, traceable environmental profiles across wide operational ranges. Its architecture integrates a dual-stage cascade refrigeration system (for models with −40°C and −70°C capability), PID-driven heating elements, and a saturated steam generator with proportional-integral-derivative (PID) humidity control—ensuring stable dew point tracking and minimal hysteresis during cyclic transitions. Designed for laboratory-grade reproducibility and long-term operational integrity, the chamber meets the physical and procedural requirements of environmental qualification per MIL-STD-810G, IEC 60068-2 series, and China’s GB/T 2423 standards.

Key Features

• Robust dual-stage refrigeration system using environmentally compliant R404A/R23 refrigerants, enabling stable operation down to −70°C without cryogenic consumables
• High-efficiency SUS#304 stainless steel interior and exterior construction—resistant to corrosion, condensation buildup, and cleaning agents used in ISO-certified labs
• Multi-layer observation window with integrated indium tin oxide (ITO) conductive film, eliminating fogging while maintaining optical clarity under rapid thermal transients
• Dual-layer high-tension silicone gasket sealing between door and chamber body—validated for leak rates <0.5 Pa·m³/s under differential pressure conditions
• Intelligent touchscreen controller with embedded data logging (≥10,000 cycle records), USB export, and configurable alarm thresholds for temperature, humidity, and runtime deviations
• Comprehensive safety architecture including over-temperature cutoff, compressor high-pressure lockout, humidity sensor drift compensation, and real-time fault diagnostics displayed on screen with ISO-standard error codes

Sample Compatibility & Compliance

The OK-TH chamber accommodates test specimens up to 1 m³ (OK-TH-1000 model), with customizable internal configurations—including removable stainless steel shelves, standardized Ø50 mm cable/port access, adjustable leveling feet, and castor-mounted mobility for facility reconfiguration. All models are designed to support full compliance with international environmental test protocols: GJB 150.3–150.4 (China’s military standard equivalent to MIL-STD-810G sections for high/low temperature), IEC 60068-2-1 (cold), -2-2 (dry heat), -2-30 (cyclic damp heat), and GB/T 2423.1–2423.4 (national equivalents). Optional validation packages include IQ/OQ documentation templates aligned with GLP and ISO/IEC 17025 laboratory accreditation requirements. The chamber’s temperature and humidity uniformity (±0.5°C / ±2.5% RH) and stability (±2.0°C / +2–3% RH) satisfy Class II environmental test chamber specifications per IEC 60068-3-5.

Software & Data Management

Embedded firmware supports continuous monitoring via Ethernet or RS-485 interfaces, enabling integration into centralized lab management systems (LIMS) or MES platforms. Logged parameters include chamber setpoint, actual temperature/humidity, ramp/soak durations, compressor status, and alarm history—with timestamps traceable to UTC. Data export complies with ASTM E2500-13 for electronic records, and optional 21 CFR Part 11-compliant software add-ons provide user role-based access control, electronic signatures, and audit trail generation for regulated environments (e.g., medical device or automotive Tier-1 supplier validation). Raw CSV files retain native resolution (0.1°C / 0.1% RH) and are compatible with MATLAB, Python pandas, and JMP for statistical process analysis.

Applications

• Qualification testing of printed circuit assemblies (PCAs) per IPC-9701A thermal cycling requirements
• Accelerated life testing of polymer encapsulants, conformal coatings, and elastomeric seals under combined thermal-humidity stress
• Verification of battery pack thermal management systems under cold-start and hot-soak conditions (−40°C to +85°C)
• Environmental screening of avionics modules per RTCA/DO-160 Section 4 (temperature) and Section 8 (humidity)
• Material compatibility assessment for automotive interior trim exposed to desert and tropical climate profiles
• Stability studies of pharmaceutical packaging under ICH Q1A(R2) long-term and accelerated storage conditions

FAQ

What is the maximum allowable sample mass load without compromising temperature/humidity uniformity?
The chamber maintains specified uniformity with up to 30% internal volume occupied by non-heat-generating samples; for thermally active devices (e.g., powered ECUs), derating to 15% volume load is recommended to avoid localized thermal gradients.
Can the controller be configured for custom test profiles beyond standard IEC or GB/T cycles?
Yes—the built-in profile editor supports up to 99 segments per program, including ramp-soak-dwell sequences, stepwise humidity modulation, and conditional branching based on elapsed time or sensor feedback.
Is third-party calibration certification available with delivery?
NIST-traceable calibration certificates (including temperature, humidity, and ramp rate verification) are available as an optional factory service, delivered with uncertainty budgets per ISO/IEC 17025.
Does the chamber support remote monitoring via cloud-based platforms?
Standard Ethernet output enables integration with MQTT or Modbus TCP gateways; cloud connectivity requires customer-supplied secure edge gateway and TLS 1.2-compliant infrastructure.
What maintenance intervals are recommended for optimal long-term performance?
Refrigerant circuit inspection and humidity sensor recalibration every 12 months; condensate drain line cleaning and gasket integrity check every 6 months; full system performance verification annually per IEC 60068-3-5 Annex B.