English Product Name

Overview

The OK-TH Series High-Low Temperature Cycling Test Chamber is an engineered environmental simulation system designed for rigorous thermal stress evaluation of electronic components, aerospace hardware, automotive modules, electrical enclosures, and polymer-based materials. Operating on the principle of forced-air convection with precision-controlled refrigeration and heating circuits, it delivers reproducible, programmable temperature and humidity profiles compliant with internationally recognized environmental test standards. Unlike ambient-only chambers, this series integrates dual-stage refrigeration (R404A primary stage + R23 cascade stage for sub-zero operation down to −70°C), enabling true cyclic testing across extreme thermal gradients — critical for accelerated life testing (ALT), HALT/HASS pre-screening, and qualification per MIL-STD-810, IEC 60068, and GB/T 2423 series protocols.

Key Features

• Full-color 7-inch TFT LCD touchscreen controller with intuitive menu navigation, real-time trend graphs, and bilingual (English/Chinese) language support — configurable via USB or Ethernet for remote firmware updates.
• Robust thermal architecture: SUS#304 stainless steel interior and exterior walls, double-layer high-tensile silicone gasket sealing at door interface, and multi-layer conductive-glass observation window ensuring long-term corrosion resistance and optical clarity during condensation-prone tests.
• Dual-stage hermetic refrigeration system using environmentally compliant R404A and R23 refrigerants — optimized for low-noise operation (<65 dB(A)) and stable sub-ambient performance without oil carryover or freeze-up risk.
• Standardized Φ50 mm test port located on the left chamber wall, fitted with removable rubber plug and compatible with shielded signal cables, thermocouple feedthroughs, or DC power lines — fully sealed when unused.
• Integrated safety architecture: Over-temperature, over-humidity, compressor high-pressure, phase-loss, and door-open interlocks — all triggering immediate power cutoff and on-screen fault code display per IEC 61000-4-5 surge immunity requirements.
• Modular internal configuration: Two adjustable SUS#304 shelves included; optional configurations include humidity-resistant PT100 sensor arrays, data logging modules (±0.15°C accuracy), and RS-485/Modbus RTU interfaces for SCADA integration.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad spectrum of test specimens — from PCB assemblies and lithium-ion battery packs to coated metal panels and elastomeric seals — with internal volumes ranging from 80 L to 1000 L. Its thermal uniformity (±0.5°C) and humidity stability (+2–3% RH) meet the spatial homogeneity criteria defined in ASTM E145-22 (Standard Specification for Gravity-Convection and Forced-Ventilation Ovens) and IEC 60068-3-5:2018 (Environmental testing — Part 3-5: Supporting documentation and guidance — Confirmation of the performance of temperature chambers). It is routinely validated per ISO/IEC 17025 for laboratory accreditation and supports GLP-compliant audit trails when paired with optional 21 CFR Part 11-compliant software.

Software & Data Management

The embedded controller logs time-stamped temperature/humidity data at user-defined intervals (1 s to 60 min resolution) into non-volatile memory (≥30 days at 10-second intervals). Optional PC-based software enables automated test sequence programming (up to 99 segments per cycle), statistical process control (SPC) charting, CSV export, and PDF report generation with digital signature fields. All data files include metadata: operator ID, chamber serial number, calibration certificate expiry, and environmental conditions — satisfying traceability requirements under ISO 9001 Clause 8.5.2 and FDA 21 CFR Part 11 Annex 11.

Applications

• Thermal cycling validation of avionics units per DO-160 Section 4 (Temperature Variation) and MIL-STD-810H Method 502.7.
• Accelerated aging of automotive ECUs and infotainment systems under combined temperature/humidity stress (e.g., ISO 16750-4).
• Qualification of medical device enclosures per IEC 60601-1 Clause 11.1 (Environmental Conditions) and GB 9706.1-2020.
• Material compatibility testing of conformal coatings, adhesives, and potting compounds under repeated thermal shock (−40°C ↔ +125°C).
• Pre-compliance screening for consumer electronics prior to formal certification against IEC 60068-2-14 (Change of Temperature) and GB/T 2423.22.

FAQ

What temperature ramp rates are achievable across the full operating range?

Heating rate is up to 4.0°C/min from ambient to +150°C; cooling rate is up to 1.0°C/min from ambient to −70°C — both measured at chamber center per IEC 60068-3-5 Annex B.

Is the chamber suitable for continuous humidity exposure at low temperatures?

Yes — the integrated dehumidification bypass and anti-condensation heater prevent frost accumulation on sensors and viewing windows during extended 5–98% RH operation at −40°C.

Can the controller be configured for custom test profiles beyond standard cycles?

Absolutely — the controller supports up to 99 programmable segments per cycle, including dwell, linear ramp, and step functions, with independent setpoint resolution of 0.1°C and 0.1% RH.

Does the unit comply with electromagnetic compatibility (EMC) requirements for lab environments?

Yes — certified to IEC 61326-1:2023 (Laboratory equipment EMC) and IEC 61000-6-3:2020 (Emission limits) with conducted/radiated emission testing performed in accredited third-party labs.

What maintenance intervals are recommended for long-term reliability?

Compressor oil and refrigerant levels should be verified annually; air filter cleaning every 3 months; door gasket inspection and calibration verification every 6 months — documented in the included Maintenance Logbook.