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

Overview

The OK-FD-TH Series Environmental Test Chamber is a precision-engineered climatic simulation system designed for rigorous evaluation of material and product reliability under controlled thermal and hygrothermal stress conditions. Based on the fundamental principles of convective heat transfer, vapor diffusion, and thermodynamic equilibrium control, this chamber enables reproducible execution of standardized temperature cycling, steady-state high/low temperature exposure, and dynamic humidity conditioning protocols. It supports deterministic assessment of dimensional stability, mechanical integrity, electrical continuity, and chemical resistance across wide operating envelopes — from -40°C to +150°C and 20–98% RH — making it indispensable in qualification testing for electronics, automotive components, aerospace subsystems, medical devices, and advanced polymers.

Key Features

• Multi-stage temperature-humidity control architecture with adaptive refrigerant flow regulation, enabling up to 20% energy reduction versus conventional systems during sustained low-temperature operation.
• Patented anti-frost technology ensures uninterrupted continuous operation at sub-zero temperatures for ≥1000 hours without evaporator icing or performance degradation.
• Dual-layer thermal insulation combining rigid polyurethane foam (≥100 mm thickness) and glass fiber reinforcement minimizes thermal bridging and improves chamber stability under rapid ramp profiles.
• Hermetically sealed compressors (Tecumseh or French OEM grade) paired with ozone-safe R404A/R23 refrigerant blend comply with Montreal Protocol requirements and ensure long-term system reliability.
• 7-inch TFT color LCD touchscreen controller supports real-time monitoring, programmable multi-step test sequences, data logging (internal SD card), and configurable alarm thresholds with relay outputs for external safety interlocks.
• Modular structural design accommodates custom internal configurations including optional multi-tier sample staging, extended cable ports (Φ50 mm standard), and reinforced SUS#304 stainless steel interior surfaces resistant to corrosion and cleaning agents.

Sample Compatibility & Compliance

The OK-FD-TH chamber accommodates a broad range of sample geometries and mounting configurations through customizable internal dimensions (80 L to 252 L volume options) and load-adaptive airflow distribution. Its performance characteristics meet or exceed the technical requirements defined in key international standards, including ISO/IEC 17025-aligned validation protocols. The system is fully compliant with GB/T 2423 series (equivalent to IEC 60068-2), US MIL-STD-810G (via GJB 150 adaptation), ASTM D4332, and IPC-9701 for accelerated environmental stress screening. All control algorithms and data acquisition modules are traceable to NIST-calibrated reference sensors, supporting GLP/GMP audit readiness and FDA 21 CFR Part 11-compliant electronic record generation when integrated with validated software platforms.

Software & Data Management

The embedded controller provides native support for CSV export of time-stamped temperature/humidity logs at user-defined intervals (1 s to 60 min resolution). Optional PC-based software (OK-EnviroLink™) enables remote supervision via Ethernet or RS485, automated report generation (PDF/Excel), statistical process control charting (X-bar/R, Cpk), and seamless integration with LIMS or MES environments using Modbus TCP or OPC UA protocols. Audit trails record all parameter changes, user logins, and system events with timestamped digital signatures — satisfying regulatory requirements for data integrity and accountability in regulated industries.

Applications

• Qualification testing of printed circuit boards (PCBs) and semiconductor packaging under thermal shock and damp heat per JEDEC JESD22-A104/A110.
• Accelerated aging studies of lithium-ion battery cells and electrolyte formulations across extreme temperature-humidity gradients.
• Validation of seal integrity and gasket performance in medical enclosures subjected to cyclic condensation and dry-out phases.
• Material compatibility assessment for automotive interior trim under simulated desert/mountain climate profiles (SAE J2412).
• Stability testing of pharmaceutical primary packaging per ICH Q1A(R2) guidelines for long-term and accelerated storage conditions.
• Environmental stress screening (ESS) of avionics hardware per RTCA DO-160 Section 4 and 5 requirements.

FAQ

What is the maximum allowable sample mass load for stable temperature uniformity?
Maximum recommended load is 25% of chamber internal volume (by gross weight), assuming adequate airflow clearance around specimens. Exceeding this may affect thermal response time and uniformity compliance.
Can the chamber perform thermal shock testing with liquid nitrogen injection?
No — this model is configured for air-cooled, single-zone thermal-hygric cycling only. Thermal shock capability requires dual-chamber or LN2-assisted designs (e.g., OK-TS Series).
Is calibration certificate included with shipment?
A factory-as-built calibration report (traceable to national metrology institutes) is provided. Full ISO/IEC 17025-accredited calibration requires third-party service engagement post-installation.
Does the controller support custom test profiles beyond standard GB/IEC methods?
Yes — users may define up to 99 programmable steps with independent setpoints, ramp rates, dwell times, and humidity coupling logic (e.g., dew point hold, RH tracking during temperature transitions).
What maintenance intervals are recommended for compressor and humidifier systems?
Compressor oil and refrigerant charge verification every 24 months; humidifier tank cleaning and electrode inspection every 3 months; filter replacement every 6 months under continuous operation.