OK Instruments OK-TS-80 Thermal Shock Test Chamber

Overview

The OK Instruments OK-TS-80 Thermal Shock Test Chamber is an engineered environmental stress screening (ESS) system designed for rapid, repeatable temperature transitions between extreme thermal states. It operates on a two-chamber (hot/cold) static-sample architecture with pneumatically actuated transfer doors—enabling precise, high-fidelity thermal shock testing in accordance with international reliability and qualification standards. The chamber utilizes the reverse Carnot refrigeration cycle across independent hot and cold storage zones: compression, condensation, expansion, and evaporation stages are optimized for stability and transient response. Each zone maintains thermal energy independently—hot zone preheats to +200 °C and cold zone precools to −70 °C—ensuring minimal recovery delay (<5 minutes) upon specimen transfer into the test zone. This architecture eliminates thermal lag associated with single-chamber forced-air systems and delivers superior control fidelity for accelerated life testing of electronic assemblies, aerospace components, automotive ECUs, and hermetically sealed packages.

Key Features

• Two-zone static-sample configuration with independent hot (+200 °C max) and cold (−70 °C min) reservoirs
• Rapid thermal transition capability: 10 °C/min average heating and cooling rates within the test zone (−50 °C to +150 °C)
• High-precision PID-controlled temperature regulation with ±0.5 °C setpoint accuracy and ±2.0 °C uniformity across 80 L test volume
• Energy-efficient dual-refrigeration circuit using environmentally compliant R404A/R23 blended refrigerant
• Structural integrity ensured by full SUS#304 mirror-finish stainless steel interior and reinforced fire-retardant PU insulation (≥60 mm thickness)
• Integrated pneumatic door actuation system with fail-safe position feedback and cycle counter logging
• Standardized Ø50 mm cable port and dual-height adjustable stainless steel shelves for flexible DUT mounting

Sample Compatibility & Compliance

The OK-TS-80 accommodates specimens up to 40 × 30 × 30 cm (W×H×D) and supports both board-level and fully assembled units—including PCBAs, solder-joint reliability samples, MEMS devices, and encapsulated sensors. Its mechanical design and control architecture meet stringent requirements for production-line qualification and laboratory-grade validation. The chamber complies with multiple national and international test standards, including GB/T 2423.22–2002 (Temperature Change), IEC 60068-2-14 (Test N: Change of Temperature), GJB 150.5–2009 (Military Standard for Temperature Shock), MIL-STD-810H Method 503.5, and EIA-364-32 (Thermal Shock Testing of Electrical Connectors). All thermal profiles are traceable and reproducible under GLP-aligned operating conditions; optional audit trail and user access control modules support FDA 21 CFR Part 11 readiness.

Software & Data Management

The chamber integrates a programmable 7-inch TFT touchscreen controller with embedded real-time data logging (1 Hz sampling rate), configurable alarm thresholds, and automatic event tagging (door open/close, temperature deviation, compressor fault). Logged datasets—including chamber air temperature, zone setpoints, and elapsed cycle time—are exportable via USB 2.0 as CSV files compatible with MATLAB, JMP, and Minitab. Optional Ethernet connectivity enables remote monitoring and centralized fleet management through OK Instruments’ ChamberLink™ platform, which supports SNMP-based alerts, historical trend analysis, and secure role-based user authentication. Calibration certificates (NIST-traceable thermistors) and IQ/OQ documentation packages are available upon request for regulated environments.

Applications

• Qualification testing of avionics modules per DO-160 Section 4 (Temperature Shock)
• Solder joint fatigue assessment in automotive ADAS controllers (ISO 16750-4)
• Reliability screening of power semiconductor packages (IGBTs, SiC MOSFETs) under JEDEC JESD22-A106
• Hermeticity validation of medical device housings and implantable electronics
• Material compatibility studies for conformal coatings, potting compounds, and thermal interface materials
• Process validation of reflow soldering and die-attach curing cycles

FAQ

What is the difference between a two-zone thermal shock chamber and a single-chamber rapid temperature cycling system?
A two-zone chamber maintains separate hot and cold reservoirs at steady-state temperatures, enabling near-instantaneous transfer of the test specimen—resulting in higher thermal shock severity and better repeatability. Single-chamber systems rely on airflow reversal and heat exchanger modulation, introducing thermal inertia and longer stabilization times.
Can the OK-TS-80 be configured for custom internal dimensions or extended temperature ranges?
Yes—OK Instruments offers OEM engineering support for modified test volumes (49 L to 225 L), enhanced cold zone capability down to −80 °C, and hot zone extension to +250 °C, subject to structural and refrigeration system recalibration.
Is the controller compliant with FDA 21 CFR Part 11 for electronic records and signatures?
The base controller supports ALCOA+ data integrity principles; full 21 CFR Part 11 compliance—including electronic signatures, audit trails, and role-based permissions—is available via the optional ChamberLink™ Secure Edition firmware package.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil and filter dryer replacement is advised every 24 months under continuous operation; annual calibration verification of all PT100 sensors and door seal integrity inspection are included in the manufacturer’s preventive maintenance protocol.
Does the chamber include built-in safety interlocks for overtemperature or overpressure events?
Yes—the system features redundant high-limit thermostats, refrigerant pressure switches, phase failure detection, and emergency stop circuitry meeting IEC 61000-6-2/6-4 immunity and emission requirements.