Thermal Shock Test Chamber – TEMI880/TEMI300 Programmable Environmental Test System

Overview

The Thermal Shock Test Chamber is an engineered environmental stress screening (ESS) system designed to evaluate material and component reliability under rapid, repetitive transitions between extreme high- and low-temperature extremes. Based on the principle of two-zone or three-zone thermal shock (typically air-to-air), the chamber subjects test specimens to controlled, accelerated thermal cycling—commonly defined as transfer times ≤ 15 seconds between chambers maintained at preset temperature extremes (e.g., −65 °C to +150 °C). This methodology accelerates failure mechanisms such as solder joint fatigue, delamination in PCBs, sealant cracking, and coefficient-of-thermal-expansion (CTE) mismatch-induced stress—critical for aerospace, automotive electronics, and semiconductor packaging validation per MIL-STD-810H Method 503.5 and IEC 60068-2-14. The system employs a dual-chamber architecture with independent refrigeration and heating circuits, enabling precise dwell time control, programmable ramp rates, and repeatable thermal transition profiles.

Key Features

• Programmable controller options: TEMI880 7-inch color TFT touchscreen (English/Chinese bilingual interface) or TEMI300 membrane-key keypad controller (English-only display), both supporting multi-segment ramp-soak cycles, data logging, and USB export
• Dual-zone thermal shock configuration with independent high-temperature (+150 °C max) and low-temperature (−70 °C min) chambers; transfer mechanism with pneumatic actuation and position feedback
• Refrigeration system: Hermetically sealed French “Tecumseh” (or equivalent Tier-1 OEM) compressors; cascade-type dual-refrigerant circuit (R404A/R23) for sub-zero capability and stable low-temperature hold
• Heating system: Nickel-chromium alloy wire heaters with PID-controlled power modulation; humidity generation via surface evaporation (optional dehumidification not included)
• Forced-air circulation: Multi-blade centrifugal fans with adjustable speed control; wide-band airflow path (top discharge / bottom intake) ensuring ±0.5 °C uniformity across 90% of working volume per IEC 60068-3-5
• Construction: Exterior housing in SUS304B stainless steel; interior chamber in fully welded, leak-tight AISI 304 stainless steel; mineral wool insulation (≥100 mm thickness) minimizing thermal loss
• Safety protections: Compressor overheat/overcurrent/low-pressure cutout; heater dry-run prevention; chamber overtemperature limiter; water-level sensor for humidifier; door interlock with emergency stop

Sample Compatibility & Compliance

The chamber accommodates standard test specimens up to 500 mm × 500 mm × 500 mm (W×D×H) with two height-adjustable stainless steel sample racks. A 50 mm diameter cable/port access hole (left-side mounted, silicone gasket sealed) enables external signal routing without compromising chamber integrity. Dual-pane tempered glass observation window supports real-time visual monitoring. All materials in contact with test space comply with RoHS Directive 2011/65/EU. The system meets structural and operational requirements of ISO 17025-accredited calibration labs when used with traceable NIST-traceable thermocouples (Type T or K, Class 1). It supports GLP-compliant test record generation when paired with validated PC software (see Software section).

Software & Data Management

Included Windows-based control software provides full remote operation, real-time trend plotting (temperature vs. time), alarm history, and CSV/Excel export of logged data (sampling interval: 1–60 sec configurable). Audit trail functionality records user login, parameter changes, cycle start/stop events, and system faults—supporting FDA 21 CFR Part 11 compliance when deployed with electronic signature modules and domain-authenticated user accounts. Data encryption (AES-128) and role-based access control (admin/operator/viewer) are available via optional firmware upgrade. Calibration certificates for integrated PT100 sensors are issued with each unit, valid for 12 months.

Applications

This thermal shock chamber is routinely deployed in: qualification testing of automotive ECUs per AEC-Q200; reliability screening of MEMS sensors and wafer-level packages; accelerated life testing of conformal-coated PCBAs; validation of battery thermal management systems under cold-start/warm-shutdown conditions; and R&D evaluation of polymer composites and adhesives exposed to cyclic thermal gradients. It is also referenced in JEDEC JESD22-A104F for temperature cycling qualification and supports custom profile development aligned with internal corporate test standards (e.g., Ford WERS, GM W317717).

FAQ

What is the typical transfer time between hot and cold zones?

Standard models achieve ≤10 seconds for specimens ≤2 kg; transfer time increases marginally with mass and thermal inertia—customized shuttle mechanisms available for heavier loads.

Is humidity control included in this thermal shock configuration?

No. This model is optimized for dry thermal shock only. Humidity-enabled variants (thermal/hygrothermal shock) require separate specification and are not covered under this base configuration.

Can the chamber be integrated into a factory MES or SCADA system?

Yes. RS485 (Modbus RTU) and Ethernet (TCP/IP) interfaces are standard; OPC UA and MQTT protocols supported via optional gateway firmware.

What maintenance intervals are recommended for the refrigeration system?

Compressor oil and filter dryer replacement every 24 months; annual verification of refrigerant charge and pressure safety switches by certified HVAC-R technician.

Does the unit include calibration documentation compliant with ISO/IEC 17025?

Yes—a factory calibration report with uncertainty budget (k=2) for all temperature sensors is provided; on-site accredited calibration services available upon request.