OK Instruments OK-TH-11 Benchtop Temperature and Humidity Controlled Chamber
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Instrument Type | Benchtop Environmental Test Chamber |
| 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 Instruments OK-TH-11 is a benchtop temperature and humidity controlled chamber engineered for precision environmental simulation in laboratory and quality assurance settings. It operates on the fundamental principle of closed-loop feedback control, integrating independent refrigeration, electric heating, steam-based humidification, and condensate-driven dehumidification subsystems to maintain stable, programmable climatic conditions within its insulated workspace. Designed in accordance with core requirements of IEC 60068-3-5 (methods for determining the performance of environmental test chambers) and aligned with functional expectations of GB/T 2423.1–2423.4 (Chinese national standards for environmental testing of electrotechnical products), the OK-TH-11 supports static conditioning, cyclic thermal-hygric profiles, and ramp-and-soak protocols. Its compact footprint and air-cooled architecture make it suitable for integration into constrained lab spaces without requiring external water or chiller infrastructure.
Key Features
- Stainless steel inner chamber (SUS304) with double-wall insulation and powder-coated steel exterior for structural integrity and corrosion resistance.
- High-efficiency air-cooled refrigeration system using a sealed compressor—optimized for stable low-temperature operation down to −40 °C without cryogenic agents.
- Calibrated platinum RTD sensors (Pt100) for temperature and capacitive polymer humidity sensors traceable to NIST standards, ensuring long-term measurement stability.
- Dual-mode humidification: stainless steel shallow-water tank with PID-controlled electric heating element for reliable 20–98 % RH output; optional ultrasonic humidifier available upon request for faster RH response.
- Intelligent airflow management via adjustable axial fans and internal baffle design—validated to achieve ≤ ±2 °C temperature uniformity and ≤ ±3 % RH uniformity across the full working volume (per IEC 60068-3-5 Annex B).
- Programmable controller with 128-segment capacity, real-time data logging (internal SD card), USB export, and Ethernet interface for remote monitoring and integration into centralized LIMS environments.
Sample Compatibility & Compliance
The OK-TH-11 accommodates samples up to 120 L (600 × 500 × 400 mm internal dimensions), supporting standard test specimens including PCB assemblies, automotive ECUs, pharmaceutical packaging, polymer films, and small-scale electronic enclosures. Load configuration follows ISO 16750-4 and MIL-STD-810H guidelines—users are advised to limit sample volume to ≤ 33 % of chamber capacity to preserve air circulation efficacy and thermal/hygrometric homogeneity. The chamber complies with electrical safety per IEC 61010-1 and EMC requirements per IEC 61326-1. Optional validation packages support IQ/OQ documentation aligned with GLP and GMP frameworks, including as-found/as-left calibration records and uncertainty budgets per ISO/IEC 17025.
Software & Data Management
The embedded controller runs OK-EnviroControl™ firmware, supporting multi-step temperature–humidity profiles with ramp rates from 0.5 to 3.0 °C/min and dwell times configurable in seconds. Data is logged at user-selectable intervals (1 s to 60 min) with timestamped CSV export. An optional PC-based software suite (OK-EnviroLink) enables real-time graphing, alarm configuration (email/SMS via SMTP), audit trail generation compliant with FDA 21 CFR Part 11 (electronic signatures, operator access levels, immutable logs), and automated report generation per ASTM E2911 or ISO 17025 reporting templates.
Applications
- Electronics reliability: Thermal cycling of semiconductors, solder joint fatigue assessment under combined thermal–hygric stress per JEDEC JESD22-A104.
- Automotive component qualification: Climate endurance testing of sensors, connectors, and infotainment modules per ISO 16750-4 and VW 80101.
- Pharmaceutical stability: Accelerated stability studies (ICH Q1A–Q1E) for drug product storage condition simulation at 25 °C/60 % RH and 30 °C/65 % RH.
- Polymer aging: Moisture absorption kinetics and dimensional stability evaluation of engineering plastics per ASTM D570 and ISO 62.
- Materials science: Corrosion behavior of coated metals under cyclic salt-spray–damp-heat sequences per ISO 9227 and ASTM B117.
FAQ
What power supply is required for the OK-TH-11?
The unit operates on single-phase 220 VAC ±10 %, 50/60 Hz, with a maximum input power of 3.2 kW. A dedicated circuit with 16 A breaker and proper grounding is mandatory.
Can the chamber perform rapid temperature transitions?
Yes—the standard heating rate is 1.0–3.0 °C/min; optional high-power heater kits enable up to 5.0 °C/min, subject to load mass and chamber loading conditions.
Is distilled water mandatory for humidification?
Yes. Use of deionized or distilled water is required to prevent mineral deposition on the heater surface and sensor drift; tap water voids the humidity sensor warranty.
Does the OK-TH-11 support third-party calibration verification?
Yes—NIST-traceable reference probes can be inserted via dedicated ports (two 6 mm diameter ports located at chamber center and corner) for on-site uniformity mapping and validation per ISO/IEC 17025.
What safety protections are integrated?
Over-temperature cut-off (mechanical backup), compressor high-pressure switch, humidity sensor failure detection, door-open alarm, water-level monitoring, and ground-fault circuit interruption (GFCI) protection.
