OK-FH-90 Combined Temperature-Humidity-Salt Fog Test Chamber
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | OK-FH-90 |
| Temperature Range | A: 0°C to 80°C |
| B | −20°C to 80°C |
| C | −40°C to 80°C |
| Humidity Range | 20–98 %RH at 20–85 °C |
| Temperature Ramp Rate | 5 / 10 / 15 °C/min |
| Temperature Uniformity | ≤ ±0.5 °C |
| Standard Load Capacity | 5 kg aluminum block (350 W heat dissipation) |
Overview
The OK-FH-90 Combined Temperature-Humidity-Salt Fog Test Chamber is an engineered environmental simulation system designed to apply three synergistic stressors—controlled temperature, regulated humidity, and neutral salt fog—in synchronized or sequenced cycles. Unlike single-stress corrosion chambers, this chamber implements cyclic corrosion testing (CCT), replicating realistic field exposure conditions such as coastal maritime atmospheres, de-icing salt-laden road environments, and industrial coastal zones where thermal cycling, moisture condensation, and chloride deposition co-occur. Its core measurement principle is not analytical but accelerated degradation induction: by precisely orchestrating phase transitions between salt spray, drying, high-humidity storage, and low-temperature conditioning, it accelerates electrochemical corrosion mechanisms—including galvanic attack, crevice corrosion, coating delamination, and conductive anodic filament formation—while maintaining metrological traceability to internationally recognized test protocols.
Key Features
- Triple-Stress Integration Architecture: Fully independent yet interlocked climate and salt fog subsystems ensure zero cross-contamination during mode transitions; critical for compliance with ASTM G85 Annex A5 (CCT-I) and ISO 16701.
- Corrosion-Resistant Construction: Interior chamber walls, air ducts, and spray nozzles fabricated from titanium-clad stainless steel (AISI 316L + Ti), reinforced fiberglass (FRP), and acid-resistant PVC/PP polymers; all gaskets rated for continuous exposure to 5% NaCl solution at elevated temperatures.
- Dynamic Salt Fog Generation: Precision-controlled compressed-air atomization system with auto-calibrated spray towers, adjustable nozzle geometry, and real-time fog density monitoring via calibrated collection funnels (per ASTM B117 requirements).
- High-Fidelity Thermal Control: Dual-stage refrigeration cascade system enables stable operation down to −40 °C; PID-regulated resistive heating ensures ≤ ±0.5 °C temperature uniformity across the working volume (IEC 60068-3-5 compliant).
- Rapid Transition Capability: Automated purge-and-dry sequence reduces residual salt residue to <0.1 mg/cm² within 12 minutes post-spray; humidity recovery time to 95% RH at 60 °C is ≤ 25 minutes.
- Modular Controller Platform: Industrial-grade PLC-based control system with Ethernet/IP interface, supporting up to 999-step programmable cycles, event-triggered logic, and audit-trail logging per FDA 21 CFR Part 11 requirements.
Sample Compatibility & Compliance
The OK-FH-90 accommodates standard test specimens up to 5 kg mass (aluminum reference load) with maximum power dissipation of 350 W. It supports flat-panel, structural, and encapsulated electronic assemblies—including automotive ECUs, battery enclosures, aerospace fasteners, and outdoor photovoltaic junction boxes. All operational parameters are validated against key international standards: ASTM B117 (neutral salt spray), ASTM G85 (modified salt spray variants), ISO 9227, ISO 16701 (electrochemical corrosion under cyclic conditions), IEC 60068-2-11 (salt mist), IEC 60068-2-52 (cyclic salt mist), GMW 14872 (General Motors’ CCT specification), SAE J2334, and Ford CETP 00.00-L-467. The chamber’s design inherently satisfies GLP/GMP documentation requirements through built-in calibration traceability, alarm history logs, and user-access-level permission management.
Software & Data Management
Equipped with OK-TestSuite™ v4.2 software, the system provides full-cycle programming, real-time parameter visualization, and automated report generation in PDF/CSV formats. Cycle definitions support nested loops, conditional branching (e.g., “if humidity >90% RH, delay spray onset by 3 min”), and external trigger inputs (e.g., TTL signals from external vibration shakers). All data—including chamber setpoints, sensor readings (Pt100 RTDs, capacitive RH sensors), alarm events, and manual interventions—are timestamped, digitally signed, and stored locally with optional cloud backup. Audit trails meet FDA 21 CFR Part 11 criteria for electronic records and signatures, including role-based access control, password complexity enforcement, and immutable log archiving.
Applications
- Automotive: Validation of chassis components, brake calipers, EV battery housings, and connector systems per OEM-specific CCT protocols.
- Aerospace: Corrosion resistance assessment of aluminum-lithium alloys, titanium fasteners, and sealed avionics enclosures exposed to tropical maritime service life profiles.
- Marine & Offshore: Qualification of deck-mounted instrumentation, subsea cable terminations, and corrosion-inhibiting coatings under ISO 20340-compliant aging schedules.
- Electronics: Reliability screening of outdoor telecom cabinets, LED streetlight drivers, and solar inverter enclosures per IEC 60068-2-52 severity levels 5–7.
- Coatings & Surface Engineering: Comparative evaluation of e-coat thickness performance, zinc-nickel plating durability, and ceramic conversion coatings under multi-phase corrosive stress.
FAQ
What distinguishes the OK-FH-90 from a conventional salt spray chamber?
It integrates precise temperature and humidity control with salt fog generation, enabling standardized cyclic corrosion tests (e.g., GMW 14872) rather than static NSS exposure.
Can the chamber perform ASTM G85 Annex A5 (CCT-I) cycles without modification?
Yes—the controller includes preloaded CCT-I templates with validated ramp profiles, dwell times, and transition logic per ASTM requirements.
How is salt residue managed between spray and humidity phases?
An automated nitrogen-purge and heated-air dry cycle removes residual NaCl deposits before initiating wet-bulb conditioning, preventing chamber self-corrosion and cross-phase contamination.
Are third-party calibration certificates available?
Yes—NIST-traceable calibration reports for temperature, humidity, and salt fog deposition rate are provided with each unit shipment.
Does the system support integration with external vibration equipment?
The OK-FH-90 features isolated signal I/O ports and synchronization triggers compatible with major shaker controllers (e.g., LDS, TIRA, Vibration Research), enabling future expansion to quad-combined (temp/humidity/salt/vibration) testing configurations.
