OK-TS Series Thermal Shock Test Chambers (Low-Temperature Impact Environmental Test Chambers)

Overview

The OK-TS Series Thermal Shock Test Chambers are engineered for high-reliability environmental stress screening of electronic components, automotive modules, aerospace assemblies, and precision optical devices. These chambers implement a two-zone (hot/cold) or single-chamber rapid transition architecture to subject test specimens to abrupt temperature shifts—typically within 10–15 seconds between extreme setpoints—enabling accelerated detection of thermal expansion mismatch, solder joint fatigue, seal integrity failure, and interlayer delamination. Unlike conventional temperature cycling chambers, the OK-TS design prioritizes thermal inertia minimization through optimized chamber geometry, low-mass internal fixtures, and high-velocity laminar airflow paths. The system operates under strict adherence to the physical principles of transient heat transfer governed by Fourier’s law and Newton’s law of cooling, ensuring reproducible shock profiles across repeated cycles.

Key Features

• Dual-zone configuration with independent hot (up to +180 °C) and cold (down to −70 °C) compartments, enabling programmable dwell times and transfer mechanisms compliant with JEDEC JESD22-A104 and IEC 60068-2-14.
• TEMI880 color touchscreen controller with real-time data logging, multi-segment ramp-soak programming, and bi-directional language switching (English/Chinese); supports RS485/RS232 and Ethernet interfaces for SCADA integration.
• Robust refrigeration architecture utilizing cascade or dual-refrigerant circuits with original Tecumseh-derived hermetic compressors—designed for continuous operation at sub-zero evaporator temperatures without oil migration or freeze-up risk.
• High-uniformity airflow system featuring a forward-curved centrifugal blower, wide-band ducting, and top-out/bottom-in circulation—validated to maintain ±0.5 °C temperature uniformity (at 100 mm from chamber walls) per ISO 16750-4 Annex B.
• Structural integrity reinforced by SUS304 interior lining, 100 mm rigid polyurethane insulation (λ ≤ 0.022 W/m·K), and dual-layer silicone rubber door gaskets rated for −70 °C to +200 °C service life.
• Comprehensive safety layer including compressor overheat/overcurrent protection, high-pressure cut-off, dry-run prevention for humidification systems, and real-time chamber over-temperature monitoring with hardware-level emergency cutoff.

Sample Compatibility & Compliance

The OK-TS chambers accommodate standard test specimens up to 300 mm × 300 mm × 300 mm (depending on model), with adjustable stainless-steel sample racks and optional load-bearing trays. A 50 mm diameter pass-through port (left-side mounted, sealed with silicone plug) enables external cabling for in-situ electrical monitoring during thermal transitions. All models comply with mechanical and electrical safety requirements per IEC 61010-1 and are compatible with GLP/GMP audit environments when configured with optional 21 CFR Part 11-compliant software packages. Calibration traceability follows ISO/IEC 17025 guidelines using NIST-traceable reference thermocouples (Type T or PT100) installed at nine standardized measurement points.

Software & Data Management

The included PC-based control suite supports full-cycle parameter definition—including dwell time, transfer speed, number of cycles, and alarm thresholds—with export capability to CSV, PDF, and XML formats. Audit trail functionality records operator ID, timestamped setpoint changes, manual overrides, and system fault logs with write-protection. Optional firmware upgrades enable remote diagnostics via Modbus TCP or OPC UA protocols. Data integrity is preserved through cyclic redundancy check (CRC)-verified storage and automatic backup to network drives or cloud repositories (AWS S3 or Azure Blob Storage via TLS 1.2 encryption).

Applications

These chambers serve critical roles in qualification testing for automotive ECUs (per ISO 16750-4), PCB assembly validation (IPC-9701), semiconductor packaging reliability (JEDEC JESD22-A104/A106), and medical device sterilization cycle development (ISO 11137). They are routinely deployed in third-party certification labs accredited to ISO/IEC 17025 for AEC-Q200 component stress screening and in R&D centers performing failure mode and effects analysis (FMEA) on MEMS sensors, battery management systems, and optoelectronic housings exposed to arctic or desert operational extremes.

FAQ

What is the typical thermal transition time between −55 °C and +125 °C?
Transition time depends on chamber model and payload mass; for an unloaded OK-TS-408, average transfer time is ≤15 seconds with ≤5 seconds dwell stabilization.
Can the chamber operate in single-zone cycling mode?
Yes—software allows disabling one zone to run as a conventional temperature cycling chamber with ramp rates up to 10 °C/min.
Is humidity control available on this series?
Standard models are dry-thermal-shock only; optional integrated steam-humidification modules (up to 95% RH at +85 °C) are available upon request.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil analysis and filter-drier replacement every 24 months; annual verification of refrigerant charge and pressure switch calibration.
Do you provide IQ/OQ documentation packages?
Yes—factory-issued Installation Qualification (IQ) and Operational Qualification (OQ) protocols, fully editable and compliant with ASTM E2500 and EU Annex 15, are available as optional deliverables.