Other Brands OK-TH Series High-Low Temperature Cycling Test Chamber

Overview

The OK-TH Series High-Low Temperature Cycling Test Chamber is an engineered environmental simulation system designed for precise, repeatable thermal cycling and combined temperature-humidity stress testing of electronic components, automotive modules, aerospace hardware, and industrial materials. It operates on the principle of forced-air convection with dual-stage refrigeration and PID-controlled resistive heating to achieve stable, programmable thermal profiles across wide operational ranges. The chamber supports both steady-state and dynamic ramp-and-soak cycles—critical for accelerated reliability qualification per MIL-STD-810, IEC 60068-2, and GB/T 2423 standards. Its robust architecture ensures long-term stability under continuous operation, while its sealed stainless-steel construction minimizes contamination risk and facilitates compliance with cleanroom-adjacent laboratory environments.

Key Features

• Full-color capacitive touch controller with intuitive GUI, supporting seamless English/Chinese language switching and real-time graphical display of setpoints, actual values, and trend curves.
• Dual-stage hermetic refrigeration system using environmentally compliant R404A (high-stage) and R23 (low-stage) refrigerants—enabling reliable operation down to −70°C without liquid nitrogen dependency.
• Double-gasketed door seal with high-tensile silicone gaskets and magnetic latching mechanism ensures leak-tight integrity at extreme thermal differentials.
• Multi-layer insulated observation window featuring tempered glass laminates and embedded conductive film for anti-fogging and unobstructed visual monitoring during active test cycles.
• Integrated safety interlocks including over-temperature cutoff, compressor high-pressure shutdown, phase failure detection, and real-time fault logging with on-screen alarm codes and automatic power isolation.
• Standard Ø50 mm feedthrough port (left-side mounted) with silicone rubber grommet—compatible with external DC/AC power feeds, thermocouple leads, or digital signal lines under sealed conditions.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad spectrum of test specimens—from PCB assemblies and battery packs to polymer enclosures and sensor housings—within customizable internal volumes (80 L to 1000 L). Its structural rigidity and uniform airflow design meet ISO 17025 requirements for measurement traceability in accredited laboratories. The system complies with multiple international test standards, including: IEC 60068-2-1 (Cold), IEC 60068-2-2 (Dry Heat), IEC 60068-2-78 (Steady-State Damp Heat), IEC 60068-2-30 (Cyclic Damp Heat), MIL-STD-810H Method 502.7 (Low Temperature), Method 501.7 (High Temperature), and GJB 150.3A–150.4A (China’s military environmental test specifications). Optional humidity calibration certificates (NIST-traceable) and validation documentation packages are available for GLP/GMP-regulated environments.

Software & Data Management

The embedded controller supports up to 100 programmable test profiles, each with up to 99 segments (ramp, soak, cycle), and enables USB-based data export in CSV format for post-test analysis. Optional Ethernet or RS485 interfaces allow integration into centralized lab management systems (LIMS) and support remote monitoring via secure HTTP/HTTPS protocols. Audit trail functionality records all operator actions—including parameter changes, start/stop commands, and alarm events—with timestamp and user ID—meeting FDA 21 CFR Part 11 requirements when paired with validated user access controls and electronic signature modules.

Applications

• Thermal shock screening of solder joints and interconnects in avionics and telecom hardware.
• Qualification testing of lithium-ion battery cells under extreme cold-start and high-temperature storage conditions.
• Validation of automotive ECUs and ADAS sensors per ISO 16750-4 and SAE J2344 thermal endurance criteria.
• Material aging studies on elastomers, adhesives, and conformal coatings exposed to alternating humidity and temperature gradients.
• Pre-compliance verification for CE marking (EN 60068 series) and China Compulsory Certification (CCC) environmental test requirements.

FAQ

What temperature and humidity accuracy can be expected during extended cyclic operation?
Temperature uniformity is maintained at ±0.5°C and humidity uniformity at ±2.5% RH across the working volume under steady-state conditions. Short-term fluctuations remain within ±2.0°C and +2–3% RH, verified per IEC 60068-3-5.

Is the chamber suitable for testing powered devices under load?
Yes—the standard Ø50 mm feedthrough port supports up to 300 W of external power delivery (with optional high-current variants), and internal SUS#304 shelves are rated for 15 kg loading per shelf under thermal cycling conditions.

Can the unit be validated for ISO/IEC 17025 accreditation?
Absolutely—factory-installed calibrated sensors (PT100 for temperature, capacitive polymer for humidity) are supplied with NIST-traceable calibration certificates. IQ/OQ documentation templates and third-party SAT (System Accuracy Tests) support are available upon request.

What maintenance intervals are recommended for the dual-stage refrigeration system?
Compressor oil and filter-drier replacement is recommended every 24 months or 6,000 operating hours—whichever occurs first—under normal use. Preventive maintenance kits and OEM service bulletins are provided with each shipment.