Smart Temperature and Humidity Controlled Environmental Test Chamber – OK-TH Series
| Brand | OK |
|---|---|
| Model Series | OK-TH-80 / OK-TH-150 / OK-TH-225 / OK-TH-408 / OK-TH-800 / OK-TH-1000 |
| Internal Dimensions (W×H×D, cm) | 40×50×40 to 100×100×100 |
| External Dimensions (W×H×D, cm) | 100×165×100 to 180×200×180 |
| Temperature Range | -70 °C to +150 °C (configurable in four standard spans: A: 0–150 °C |
| B | -20–150 °C |
| C | -40–150 °C |
| D | -70–150 °C) |
| Humidity Range | 20–98 %RH (optional: 5–98 %RH or 10–98 %RH) |
| Temperature Uniformity | ±0.5 °C |
| Humidity Uniformity | ±2.5 %RH |
| Temperature Stability | ±2 °C |
| Humidity Stability | +2 to +3 %RH |
| Resolution | 0.1 °C / 0.1 %RH |
| Heating Rate | ~4.0 °C/min |
| Cooling Rate | ~1.0 °C/min |
| Refrigeration System | Hermetic dual-stage compressor with eco-friendly refrigerants R404A/R23 |
| Controller | LCD touch-screen interface with bilingual (English/Chinese) display |
| Chamber Material | SUS#304 stainless steel interior and exterior |
| Standard Accessories | One 50 mm diameter cable port |
| Power Supply | AC 380 V ±5 %, 50 Hz ±0.5 Hz, 3-phase 5-wire, 2.5 m cable length |
| Compliance | MIL-STD-810G (via GJB150.3/4), IEC 60068-2-1 (Cold), IEC 60068-2-2 (Dry Heat), IEC 60068-2-78 (Steady-State Damp Heat), IEC 60068-2-30 (Cyclic Damp Heat), GB/T 2423.1–2001, GB/T 2423.2–2001, GB/T 2423.4–1993 |
Overview
The OK-TH Series Smart Temperature and Humidity Controlled Environmental Test Chambers are precision-engineered systems designed for rigorous environmental simulation in materials science, electronics reliability testing, automotive component validation, and pharmaceutical stability studies. These chambers operate on the principle of forced-air convection combined with integrated refrigeration and steam-based humidification, enabling precise, repeatable control over both thermal and hygrometric conditions within a sealed test volume. Unlike basic incubators or storage cabinets, the OK-TH series implements dual-loop PID control architecture—separate feedback loops for temperature and humidity—with real-time compensation for load-induced thermal mass shifts and latent heat effects during humidity transitions. The chamber’s structural integrity is maintained through full SUS#304 stainless steel construction, ensuring long-term corrosion resistance in high-humidity and condensation-prone operational regimes. Its modular design supports seamless integration into GLP-compliant laboratories and ISO/IEC 17025-accredited testing facilities where traceable environmental conditioning is required per test method specifications.
Key Features
- Configurable temperature range spanning -70 °C to +150 °C across four standardized profiles (A–D), accommodating MIL-STD-810G low-temperature soak and high-temperature aging protocols.
- Humidity control from 20–98 %RH as standard, with optional extended ranges (5–98 %RH or 10–98 %RH) enabled by enhanced steam generator capacity and dew-point referenced humidity sensing.
- High-fidelity chamber uniformity: ±0.5 °C temperature deviation and ±2.5 %RH spatial variation across the entire working volume, verified per IEC 60068-3-5.
- Independent heating and cooling rate calibration: typical ramp rates of ~4.0 °C/min (heat-up) and ~1.0 °C/min (cool-down), optimized for thermal shock pre-conditioning without overshoot or prolonged stabilization delays.
- LCD touch-screen controller with embedded data logging (up to 10,000 records), password-protected parameter editing, and configurable alarm thresholds for temperature/humidity deviation, door open status, and system fault conditions.
- Hermetically sealed dual-stage refrigeration system using environmentally compliant R404A/R23 refrigerant blend, eliminating oil carryover and ensuring stable sub-zero performance down to -70 °C.
Sample Compatibility & Compliance
The OK-TH series accommodates diverse sample geometries through six scalable internal volumes—from 80 L (OK-TH-80) to 1000 L (OK-TH-1000)—all featuring removable stainless steel shelves, a standardized 50 mm cable port for external sensor integration, and caster-mounted mobility with locking leveling feet. Each unit is certified to meet or exceed the environmental stress requirements of multiple international standards, including MIL-STD-810G Method 502.5 (low temperature), Method 501.5 (high temperature), IEC 60068-2-78 (steady-state damp heat), and IEC 60068-2-30 (cyclic damp heat). The chamber’s control firmware supports audit-ready operation under GLP and GMP frameworks, with optional electronic signature capability and 21 CFR Part 11–compliant data export (CSV/Excel) when paired with OK-Link™ PC software. All units undergo factory verification per ISO/IEC 17025 Annex A.2 procedures prior to shipment.
Software & Data Management
Standard operation is managed via the built-in touch-screen controller, supporting bilingual UI navigation (English/Chinese), programmable multi-step test profiles (up to 99 segments), and real-time trend visualization of temperature and humidity trajectories. For advanced data handling, OK-Link™ software (Windows-compatible, USB/RS485 interface) enables remote monitoring, automated report generation (PDF/Excel), and time-synchronized data export with timestamped metadata—including operator ID, chamber serial number, and calibration certificate expiry date. Logged datasets include full environmental history with resolution of 0.1 °C and 0.1 %RH, aligned to NIST-traceable reference sensors. Optional firmware upgrade packages support CSV export with header compliance for LIMS ingestion and CSV-to-XML transformation for ELN integration.
Applications
- Accelerated aging of polymer composites and elastomeric seals under combined thermal-hygrometric stress per ASTM D3045.
- Pre-conditioning of printed circuit boards (PCBs) and microelectronic assemblies prior to solderability or functional testing (IPC-J-STD-006, JESD22-A104).
- Stability chamber qualification for ICH Q1A(R2) long-term and accelerated storage condition mapping (25 °C/60 %RH, 30 °C/65 %RH, 40 °C/75 %RH).
- Validation of packaging barrier performance (e.g., blister foil, aluminum laminates) under cyclic humidity exposure per ASTM F1249.
- Environmental stress screening (ESS) of aerospace avionics modules per DO-160 Section 4 (temperature) and Section 5 (humidity).
- Material moisture sorption isotherm determination for hygroscopic powders and excipients in pharmaceutical development.
FAQ
Is the OK-TH chamber suitable for continuous unattended operation in a 24/7 test environment?
Yes. All models feature redundant safety cutoffs—including independent high-limit temperature controllers, refrigerant pressure switches, and humidity sensor self-diagnostic routines—certified for Class II continuous-duty operation per UL 61010-1.
Can the chamber be calibrated to ISO/IEC 17025 requirements?
Yes. OK Instruments provides accredited third-party calibration services with NIST-traceable certificates covering temperature uniformity, humidity accuracy, and ramp rate verification at user-specified setpoints.
What is the recommended maintenance interval for the refrigeration system?
Compressor oil and filter replacement is advised every 18 months under standard usage; full system performance verification (including leak detection and refrigerant charge validation) is recommended annually.
Does the controller support Ethernet connectivity for networked lab management systems?
The base controller supports RS485 Modbus RTU; Ethernet (Modbus TCP/IP) and OPC UA interfaces are available as factory-installed options upon request.
Are custom internal configurations—such as additional ports, reinforced shelves, or non-standard shelving layouts—available?
Yes. OK Instruments offers engineering consultation and mechanical customization per customer drawings, subject to structural integrity review and thermal modeling validation.
