English Product Name

Overview

The OK-TH Series Low-Temperature & Low-Humidity Environmental Test Chamber is an engineered solution for precise simulation of extreme climatic conditions in laboratory and industrial quality assurance environments. Designed in accordance with international environmental testing standards—including MIL-STD-810G, IEC 60068-2-1 (Cold), IEC 60068-2-2 (Dry Heat), IEC 60068-2-30 (Cyclic Damp Heat), and GB/T 2423.1–2423.4—this chamber supports rigorous validation of material stability, electronic component reliability, packaging integrity, and product performance under controlled low-temperature and low-humidity stress profiles. Its dual-stage refrigeration architecture enables stable operation down to –70°C while maintaining humidity control as low as 5% RH, making it suitable for applications requiring simultaneous cryogenic cooling and desiccated air conditioning—such as lithium battery dry-room simulation, optical coating storage validation, and semiconductor moisture sensitivity level (MSL) preconditioning per JEDEC J-STD-020.

Key Features

• High-precision microprocessor-based controller with 7-inch full-color TFT touchscreen interface, supporting seamless English/Chinese language switching and intuitive parameter programming.
• Dual-stage refrigeration system using environmentally compliant refrigerants (R404A for primary stage, R23 for secondary cascade), optimized for low-noise operation (<65 dB(A)) and long-term thermal stability at sub-zero temperatures.
• Double-gasketed door seal employing high-tensile, heat-resistant silicone rubber ensures leakage rates <0.5% volume change per hour, critical for maintaining low-RH conditions during extended test cycles.
• Interior and exterior chambers fabricated entirely from electropolished SUS#304 stainless steel, providing corrosion resistance, non-outgassing surfaces, and compatibility with cleanroom-grade maintenance protocols.
• Multi-layer observation window with integrated indium tin oxide (ITO) conductive film eliminates condensation and enables unobstructed real-time visual monitoring without compromising chamber integrity.
• Comprehensive safety architecture including independent over-temperature cutoff, humidity sensor failure detection, compressor high-pressure shutdown, and instantaneous fault logging with on-screen diagnostic codes.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad range of sample types—from printed circuit boards (PCBs) and automotive ECUs to pharmaceutical packaging and aerospace composites—without requiring internal modifications. Standard configurations include two adjustable stainless-steel shelves, four swivel casters with locking brakes, and four leveling feet for vibration-isolated placement. All models comply with electromagnetic compatibility (EMC) requirements per EN 61326-1 and are designed to meet GLP/GMP documentation readiness criteria. Optional features—such as data logger integration, RS485/Modbus RTU communication, and 21 CFR Part 11–compliant audit trail software—support regulated industries requiring traceable environmental validation records.

Software & Data Management

The embedded controller logs temperature and humidity data at user-defined intervals (1–60 seconds), storing up to 100 test programs with 99 segments each. Export functionality supports CSV format via USB drive for post-test analysis in Excel or statistical process control (SPC) platforms. Optional PC-based software provides remote monitoring, real-time graphing, alarm email/SMS notification, and automated report generation aligned with ISO/IEC 17025 calibration record templates. All logged data includes timestamp, setpoint, actual value, deviation, and event flags—enabling full compliance with FDA 21 CFR Part 11 requirements when paired with appropriate user access controls and electronic signature modules.

Applications

• Accelerated aging of polymer films and adhesives under combined cold/dry stress to evaluate embrittlement thresholds.
• Preconditioning of moisture-sensitive devices (MSDs) prior to reflow soldering, per IPC/JEDEC J-STD-033 guidelines.
• Validation of vacuum-sealed packaging barrier performance under low-RH cycling conditions.
• Testing of optical sensors and laser diodes for dew-point-related signal drift in arid operational environments.
• Environmental screening of battery management systems (BMS) across wide thermal and humidity gradients.
• Material compatibility studies for spacecraft thermal control coatings exposed to lunar/Martian ambient extremes.

FAQ

What is the lowest achievable humidity level, and how is it maintained at –70°C?

The chamber achieves 5% RH minimum (optional) even at –70°C through a combination of deep-cooling dehumidification and recirculated dry-air purge mode—eliminating reliance on desiccant wheels that degrade below –40°C. The dual-refrigerant cascade system maintains consistent dew point suppression without condensation in the air-handling path.
Can the chamber be integrated into a centralized lab monitoring network?

Yes—standard RS485 Modbus RTU output allows connection to SCADA, LabVantage, or custom BMS platforms. Optional Ethernet/WiFi modules support MQTT and OPC UA protocols for Industry 4.0-compliant data ingestion.
Is calibration certification included with shipment?

Each unit ships with a factory-as-built calibration certificate traceable to NIST standards, covering temperature uniformity, humidity accuracy, and ramp rate verification per ISO/IEC 17025 Annex A. On-site IQ/OQ documentation packages are available upon request.
How is condensation prevented on internal surfaces during rapid cooldown?

A programmable pre-cool sequence gradually reduces chamber wall temperature before introducing test samples, minimizing thermal shock-induced condensation. The ITO-heated viewing window and heated door gasket further suppress surface moisture accumulation.