OK-TH-225 Temperature and Humidity Controlled Chamber
| Brand | Other Brands |
|---|---|
| Origin | Imported |
| Manufacturer Type | General Distributor |
| Model | OK-TH-225 |
| Price | USD 3,100 (approx.) |
Overview
The OK-TH-225 Temperature and Humidity Controlled Chamber is a precision-engineered environmental test chamber designed for reliable, long-term simulation of controlled thermal and hygroscopic conditions. It operates on the principle of balanced heating, cooling, humidification, and dehumidification—implemented via a Balanced Temperature and Humidity Control (BTHC) system—to maintain stable setpoints across wide operational ranges. The chamber employs PID-controlled solid-state relays (SSRs) to dynamically match heating/humidifying output with thermal and moisture losses, enabling high reproducibility in accelerated aging, reliability screening, and material stability testing. Engineered for industrial R&D labs, quality assurance departments, and electronics manufacturing facilities, the OK-TH-225 complies with fundamental environmental stress screening (ESS) protocols and supports standardized test execution under ambient load-free conditions at 25 °C ±6 °C.
Key Features
- Robust safety architecture: dry-run protection for humidifier, independent overtemperature cutoff, low-water-level detection, compressor overload/overheat/overcurrent protection, high-pressure refrigerant switch, circuit breaker, and earth-leakage circuit interrupter (ELCI).
- Advanced BTHC control logic using PID algorithm with SSR-driven power modulation—ensuring minimal deviation and long-term stability during extended dwell or ramp-hold cycles.
- Full capillary tube-based refrigeration system with automatic capacity regulation—superior to thermostatic expansion valve (TXV) designs in response consistency, temperature uniformity, and condensation management.
- Ergonomic curved cabinet design with flush-mount, non-reactive door handles and intuitive touch-screen controller supporting multi-segment programming, real-time trend logging, and dual-temperature mode operation.
- Optimized air circulation system with centrifugal blower and ducted laminar flow distribution—achieving ≤±0.5 °C temperature uniformity and ≤±2 % RH uniformity (at 25 °C/60 % RH, empty chamber).
Sample Compatibility & Compliance
The OK-TH-225 accommodates a broad range of non-hazardous solid and packaged samples—including PCB assemblies, polymer components, automotive ECUs, pharmaceutical packaging, and optical materials—provided dimensional constraints and thermal mass are within specified limits. It meets essential national and international environmental test standards including GB/T 2423.1–2023 (Cold Test), GB/T 2423.2–2023 (Dry Heat Test), IEC 60068-2-1 (Test A: Cold), IEC 60068-2-2 (Test B: Dry Heat), GJB 1032A–2021 (Environmental Stress Screening for Electronic Equipment), and MIL-STD-2164A (Electronics ESS). While not certified for GLP/GMP audit trails out-of-the-box, its controller supports manual log export and timestamped event recording compatible with internal QA documentation workflows.
Software & Data Management
The integrated touch-panel controller provides local programming of up to 99 segments per profile, real-time graphing of chamber temperature and relative humidity, and data export via USB 2.0 to CSV format. No proprietary software or cloud connectivity is included; however, RS-485 Modbus RTU interface enables integration into third-party SCADA or LIMS platforms for centralized monitoring. All alarm events—including sensor faults, safety interlock triggers, and power loss—are time-stamped and retained in non-volatile memory for post-test forensic review. Firmware updates are performed manually via USB, ensuring full traceability and compliance with internal IT security policies.
Applications
- Environmental stress screening (ESS) of electronic subassemblies prior to burn-in or field deployment.
- Accelerated aging studies for packaging integrity, adhesive bond strength, and polymer dimensional stability.
- Stability testing of medical device enclosures under IEC 60601-1 climatic requirements.
- Qualification of battery modules across temperature-humidity boundary conditions per UN 38.3 Section 40.3.
- Material compatibility assessment for coatings, sealants, and composite laminates exposed to cyclic humidity loading.
FAQ
What is the recommended cooling water specification for optimal performance?
Cooling water temperature must be maintained between 10 °C and 28 °C, with inlet pressure regulated to 0.1–0.3 MPa. Deviations outside this range may impair condenser efficiency and extend cooldown times.
How does load affect temperature and humidity ramp rates?
Ramp rates are declared under no-load, ambient reference conditions. Actual performance varies with sample thermal mass, surface emissivity, and internal airflow obstruction—users should validate cycle times empirically for each fixture configuration.
Is the OK-TH-225 compliant with FDA 21 CFR Part 11?
No. The unit lacks electronic signature capability, audit trail automation, or role-based access control required for Part 11 compliance. It may be used in non-GxP environments or as part of a validated workflow where manual recordkeeping satisfies regulatory expectations.
Can external sensors be connected for product-level monitoring?
Yes—the chamber includes two auxiliary PT100 input channels (optional) for integrating user-provided thermistors or humidity probes inside the test space, enabling direct product-core measurement alongside chamber ambient tracking.
What maintenance intervals are recommended for sustained accuracy?
Monthly visual inspection of humidifier tank and drain lines; quarterly calibration verification of chamber-mounted temperature and RH sensors using NIST-traceable references; annual refrigerant pressure and capillary integrity check by qualified service technician.
