OK-TH Series High-Low Temperature Environmental Test Chamber
| Brand | OK |
|---|---|
| Model Range | OK-TH-80 / OK-TH-150 / OK-TH-225 / OK-TH-408 / OK-TH-800 / OK-TH-1000 |
| Internal Chamber Dimensions (W×D×H) | 400×500×400 mm to 1000×1000×1000 mm |
| External Dimensions (W×D×H) | 1000×1650×1000 mm to 1800×2000×1800 mm |
| Temperature Range | -70°C to +150°C (selectable sub-ranges: 0°C–150°C, -20°C–150°C, -40°C–150°C) |
| Humidity Range | 20–98% RH (optional: 5–98% RH or 10–98% RH) |
| Temperature Ramp Rate | +4.0°C/min (heat-up), -1.0°C/min (cool-down) |
| Temperature Uniformity | ±0.5°C |
| Humidity Uniformity | ±2.5% RH |
| Temperature Fluctuation | ±2.0°C |
| Humidity Fluctuation | +2–3% RH |
| Resolution | 0.1°C / 0.1% RH |
| Test Port | Ø50 mm (left side) |
| Interior Material | SUS#304 stainless steel |
| Viewing Window | Multi-layer tempered glass with conductive ITO film |
| Controller | 7-inch color touchscreen (English/Chinese interface) |
| Compressor | Hermetic low-noise dual-stage refrigeration system (Tecumseh/Tecumseh-derived, France-sourced) |
| Safety Features | Over-temperature, over-humidity, compressor overload, phase failure, and door-open interlock protection |
| Compliance | MIL-STD-810G, GJB 150.3–1986 (high-temp), GJB 150.4–1986 (low-temp), IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-30 (damp heat cyclic), GB/T 2423.1–2001, GB/T 2423.2–2001, GB/T 2423.4–1993 |
Overview
The OK-TH Series High-Low Temperature Environmental Test Chamber is an engineered environmental simulation system designed for controlled thermal and hygrothermal stress testing of electronic components, aerospace subsystems, automotive modules, electrical enclosures, and advanced materials. It operates on the principle of forced-air convection combined with precision refrigeration and electric heating circuits to achieve stable, repeatable, and traceable temperature and humidity profiles across wide operational ranges. The chamber’s architecture integrates a dual-stage cascade refrigeration system—capable of reaching -70°C—with PID-controlled resistive heating elements and steam-based humidification, enabling compliance with both steady-state and dynamic test protocols defined in international environmental testing standards. Its sealed stainless-steel interior, multi-layer insulated walls, and high-tensile silicone gasketing ensure minimal thermal leakage and long-term stability under continuous operation at extreme setpoints.
Key Features
- 7-inch full-color TFT touchscreen controller with intuitive English/Chinese bilingual interface, supporting programmable ramp-soak cycles, data logging, and real-time trend visualization
- Dual-stage hermetic refrigeration system using France-sourced Tecumseh-derived compressors for reliable low-temperature performance down to -70°C
- SUS#304 stainless-steel internal chamber and structural frame, corrosion-resistant and compliant with ISO 14644 cleanroom-compatible surface finish requirements
- Multi-layer tempered observation window with integrated indium tin oxide (ITO) conductive film for anti-fogging and unobstructed visual monitoring during active testing
- Single Ø50 mm test port located on the left side wall, fitted with silicone grommet and compatible with standard signal/power feedthroughs (e.g., thermocouple wires, LVDS cables)
- Comprehensive safety architecture including over-temperature cutoff, compressor high-pressure shutdown, phase loss detection, and door-open interlock circuitry
- Standard two-tier adjustable stainless-steel shelving system, load-rated for uniform distribution up to 30 kg per shelf
Sample Compatibility & Compliance
The OK-TH chamber accommodates samples ranging from PCB assemblies and LED lighting modules to battery packs, sensor housings, and polymer composites. Its modular internal dimensions—from 80 L (OK-TH-80) to 1000 L (OK-TH-1000)—allow scalable validation of both component-level and full-system units. All models are factory-calibrated and documented to meet traceability requirements under ISO/IEC 17025-accredited procedures. The system supports full compliance with MIL-STD-810G Method 502.5 (low temperature), Method 501.5 (high temperature), and Method 507.5 (humidity); IEC 60068-2 series; and Chinese national standards GB/T 2423.1–2001 (cold), GB/T 2423.2–2001 (dry heat), and GB/T 2423.4–1993 (cyclic damp heat). Optional validation packages include IQ/OQ documentation templates aligned with GLP and GMP environments.
Software & Data Management
The embedded controller logs temperature and humidity values at user-defined intervals (1–60 seconds), storing up to 10,000 data points internally. Export is supported via USB flash drive in CSV format for post-processing in Excel or MATLAB. Optional PC-based software (OK-Link Suite) enables remote monitoring, multi-chamber synchronization, alarm email notification (SMTP), and audit-trail generation compliant with FDA 21 CFR Part 11 requirements—including electronic signatures, user access levels, and immutable event logging. All firmware updates are delivered via signed binary files with SHA-256 checksum verification.
Applications
This test chamber is routinely deployed in R&D labs and QC departments for thermal cycling qualification (e.g., JEDEC JESD22-A104), storage condition validation (ISO 14644-1 Class 8 ambient storage), accelerated life testing of adhesives and conformal coatings, cold-start performance evaluation of EV power electronics, and pre-shipping environmental screening of avionics hardware. Its ability to maintain ±0.5°C uniformity and ±2.5% RH uniformity across the full working volume ensures high reproducibility between test runs—critical for comparative analysis in ASTM D4329 (plastics weathering) and IPC-9701A (interconnect reliability) workflows.
FAQ
What is the standard warranty period for the OK-TH chamber?
The standard warranty covers parts and labor for 24 months from shipment date, excluding consumables (e.g., humidifier tanks, filters) and damage resulting from improper installation or misuse.
Can the chamber be configured for rapid thermal cycling (RTCA DO-160 Section 25)?
Yes—models equipped with optional high-capacity refrigeration and enhanced heater banks support ramp rates exceeding ±5°C/min, meeting RTCA DO-160G Section 25 Category C and D profiles when paired with external thermal shrouds.
Is third-party calibration certification included with delivery?
A NIST-traceable as-delivered calibration report (covering temperature and humidity sensors at three points across the range) is provided. Full ISO/IEC 17025 calibration with uncertainty budgets is available as an add-on service.
Does the controller support Modbus RTU or Ethernet/IP for integration into factory SCADA systems?
Standard configuration includes RS-485 Modbus RTU. EtherNet/IP and OPC UA gateways are available as field-installable options with protocol-specific configuration tools.
How is condensation managed during high-humidity transitions?
The chamber employs a dedicated dehumidification bypass circuit and pre-heated humidification steam lines to minimize condensate formation on chamber walls and test specimens during humidity ramping phases.
