OK Environmental Test Chamber OK-TH-8
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Domestic |
| Model | OK-TH-8 |
| Instrument Type | Benchtop |
| Cooling Method | Air-Cooled |
| Temperature Range | -40 °C to +150 °C |
| Humidity Range | 20–98 % RH |
| Temperature Uniformity | ≤ ±2 °C |
| Temperature Fluctuation | ±1 °C (high-temp), ±2 °C (low-temp) |
| Humidity Uniformity | ≤ ±3 % RH |
| Humidity Fluctuation | ±3 % RH |
| Heating Rate | 1.0–3.0 °C/min |
| Internal Chamber Dimensions (W×D×H) | 600 × 500 × 400 mm |
Overview
The OK Environmental Test Chamber OK-TH-8 is a benchtop programmable temperature and humidity chamber engineered for precise simulation of dynamic environmental stress profiles. It operates on the principle of forced-air convection with independent refrigeration and steam-based humidification systems, enabling synchronized or decoupled control of temperature and relative humidity across wide operational ranges. Unlike static conditioning chambers, the OK-TH-8 supports multi-segment cyclic programs—such as ramp-hold-ramp sequences, stepwise humidity transitions, and combined thermal-hygrometric cycling—making it suitable for accelerated reliability testing per IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-30 (damp heat, cyclic), and GB/T 2423.1–4. Its architecture integrates a high-efficiency air-cooled compressor, PID-controlled resistive heating elements, and a stainless-steel steam generator with deionized water feed, ensuring stable thermal-hygrometric response and long-term repeatability under continuous duty.
Key Features
- Benchtop form factor with compact internal volume (120 L) optimized for laboratory-scale validation of small-to-medium components and subassemblies.
- Independent dual-loop PID control for temperature and humidity, minimizing cross-coupling effects during rapid transitions.
- Programmable controller with intuitive touch interface supporting up to 99 segments per test cycle, including ramp rates, dwell times, and humidity setpoint modulation.
- Air-cooled refrigeration system eliminates need for external water cooling, reducing installation complexity and facility dependency.
- Internal chamber constructed from SUS304 stainless steel with insulated double-wall design and silicone-sealed door gasket to ensure thermal integrity and condensation resistance.
- Comprehensive safety suite: over-temperature cut-off, dry-run protection for humidifier, leakage current detection, and real-time fault logging with audible/visual alerts.
Sample Compatibility & Compliance
The OK-TH-8 accommodates samples up to 600 mm (W) × 500 mm (D) × 400 mm (H), with recommended loading not exceeding one-third of internal volume to preserve airflow uniformity and parameter stability. It complies with core environmental test standard requirements for test severity definition and chamber performance verification, including ISO 16750-4 (road vehicles), IEC 62133 (secondary cells and batteries), and ASTM D4332 (conditioning of plastics). While not certified to GLP or FDA 21 CFR Part 11 out-of-the-box, its data logging capability (optional RS485/USB output) supports integration into validated systems where audit trails and electronic signature functionality are implemented at the host software layer.
Software & Data Management
The embedded controller provides local program editing, real-time trend display, and event-triggered data capture (temperature/humidity readings at 1-second intervals). Optional PC-based software enables remote monitoring via Ethernet or USB, export of CSV-formatted logs with timestamps, and generation of compliance-ready test reports—including chamber calibration history, deviation alarms, and pass/fail status against user-defined acceptance criteria. All logged data includes metadata such as operator ID, test ID, start/stop timestamps, and firmware version—facilitating traceability in quality management systems aligned with ISO 9001 and IATF 16949.
Applications
- Automotive electronics: Validation of ECUs, sensors, and infotainment modules under simulated diurnal cycles (-40 °C/20% RH → +85 °C/85% RH) per ISO 16750-4.
- Consumer devices: Thermal-hygrometric stress screening of smartphones, wearables, and IoT enclosures prior to field deployment.
- Energy storage: Calendar life assessment of Li-ion battery cells under controlled humidity cycling at elevated temperatures (e.g., 45 °C/60% RH for 1000 h).
- Materials science: Evaluation of dimensional stability, delamination resistance, and moisture absorption kinetics in polymer composites and laminated packaging films.
- Pharmaceutical packaging: Accelerated stability testing of blister packs and vial stoppers per ICH Q1A(R2) guidance using defined temperature-humidity profiles.
FAQ
What is the minimum operating temperature at which 95% RH can be maintained?
At temperatures below 0 °C, condensation risk limits effective humidification; therefore, ≥95% RH is only achievable above +5 °C.
Does the chamber support automatic dew point calculation and control?
No—the OK-TH-8 controls relative humidity directly via steam injection and solid-state desiccant-assisted dehumidification; dew point is derived post-acquisition from logged T/RH pairs.
Is calibration certificate included with shipment?
A factory calibration report (traceable to NIM standards) is provided; ISO/IEC 17025-certified calibration requires third-party service engagement.
Can the unit operate continuously for 72+ hours without intervention?
Yes—designed for unattended operation with auto-recovery after power interruption and built-in water-level monitoring for humidifier reservoir.
What maintenance intervals are recommended for optimal performance?
Evaporator coil cleaning every 6 months, humidifier tank descaling with citric acid solution every 3 months, and annual sensor verification using NIST-traceable reference hygrometer and dry-well calibrator.
