OK-TH Series High-Low Temperature Cycling Environmental Test Chamber

Overview

The OK-TH Series High-Low Temperature Cycling Environmental Test Chamber is a precision-engineered climatic simulation system designed for rigorous thermal and hygrothermal stress testing of electronic components, aerospace hardware, automotive ECUs, military-grade enclosures, and advanced material systems. Operating on the principle of forced-air convection with dual-stage refrigeration and PID-controlled resistive heating, the chamber delivers programmable temperature cycling profiles across wide operational ranges—from deep cryogenic conditions (−70°C) to high-temperature exposure (150°C), optionally combined with controlled humidity (5–98% RH). Its architecture complies with fundamental thermodynamic stability requirements for reproducible environmental qualification per MIL-STD-810G, IEC 60068-2, and GB/T 2423 standards. Unlike ambient-only chambers, the OK-TH series integrates real-time thermal inertia compensation and airflow optimization to minimize spatial gradients—ensuring uniform thermal distribution critical for accelerated life testing and failure mode analysis.

Key Features

• Full-color 7-inch capacitive touchscreen controller with intuitive drag-and-drop profile programming, real-time data logging, and bilingual (English/Chinese) UI support
• Dual-stage refrigeration circuit using environmentally compliant R404A (high-stage) and R23 (low-stage) refrigerants, enabling stable operation down to −70°C without liquid nitrogen dependency
• SUS#304 stainless steel interior and exterior construction—electropolished for corrosion resistance and ease of decontamination in regulated lab environments
• Multi-layer observation window with embedded ITO (indium tin oxide) conductive film, eliminating condensation while maintaining optical clarity during high-humidity cycles
• Double-gasketed door seal with high-tensile silicone elastomer gaskets, tested to maintain leak rates <1.0 × 10⁻³ mbar·L/s under differential pressure
• Standard Ø50 mm feedthrough port on left wall, fitted with removable brass gland for safe integration of power, signal, or sensor cables without compromising chamber integrity
• Comprehensive safety architecture: independent over-temperature cut-off, humidity sensor fault detection, refrigerant pressure monitoring, phase loss protection, and automatic emergency shutdown with event-stamped fault log

Sample Compatibility & Compliance

The OK-TH chamber accommodates samples up to 1000 L volume (OK-TH-1000 model), supporting standard test specimens including PCB assemblies, battery modules, sealed optical housings, polymer composites, and medical device packaging. Its thermal performance meets the spatial uniformity and stability criteria defined in IEC 60068-3-5 (environmental testing guidance) and GB/T 2423.1–2001 (cold test) / GB/T 2423.2–2001 (dry heat test). For defense applications, it satisfies GJB 150.3–1986 (high-temperature) and GJB 150.4–1986 (low-temperature) environmental test methods. Optional calibration certificates traceable to NIST or CNAS-accredited labs are available upon request. The chamber’s stainless-steel interior and absence of organic insulation materials ensure compatibility with cleanroom protocols and avoid outgassing concerns in vacuum-integrated workflows.

Software & Data Management

The embedded controller supports up to 100 user-defined test programs, each with 99 segments—including ramp, soak, and step functions. All runtime parameters (chamber setpoint, actual temperature/humidity, compressor status, alarm history) are logged at configurable intervals (1s–60 min) to internal 4GB flash memory. USB export enables CSV-formatted data transfer for post-processing in MATLAB, JMP, or Minitab. Optional Ethernet or RS485 communication permits remote supervision via Modbus TCP or proprietary OKLink protocol. Audit trail functionality records operator login, parameter changes, and alarm acknowledgments—supporting GLP/GMP documentation requirements under FDA 21 CFR Part 11 when paired with validated user access controls and electronic signature modules.

Applications

• Temperature cycling qualification of automotive ADAS sensors per AEC-Q200 Rev D
• Thermal shock screening of lead-free solder joints in avionics PCBs
• Moisture resistance validation of conformal coatings used in industrial IoT gateways
• Accelerated aging of lithium-ion battery cells under combined thermal-hygrothermal stress
• Material coefficient-of-thermal-expansion (CTE) correlation studies for MEMS packaging
• Pre-compliance environmental stress screening prior to formal MIL-STD-810H certification

FAQ

What is the minimum achievable temperature with optional humidity control?

The −40°C and −70°C models maintain full humidity capability (20–98% RH) down to −10°C; below that, dehumidification is disabled to prevent condenser icing—consistent with IEC 60068-2-30 Annex A guidelines.

Can the chamber be integrated into a centralized lab monitoring network?

Yes—via optional Ethernet module supporting SNMP v3 and HTTP API endpoints for real-time status polling, alarm forwarding, and remote start/stop commands.

Is third-party calibration included with delivery?

Factory calibration is performed pre-shipment using traceable reference sensors; ISO/IEC 17025-certified calibration reports are available as a billable add-on.

What maintenance intervals are recommended for the refrigeration system?

Compressor oil analysis and refrigerant purity verification are advised every 2,000 operating hours; filter-drier replacement every 3 years under continuous operation.

Does the chamber meet CE or UKCA marking requirements?

All OK-TH models comply with EU Machinery Directive 2006/42/EC, EMC Directive 2014/30/EU, and Low Voltage Directive 2014/35/EU—certified by TÜV Rheinland (Certificate No. R 50425242 0001).