OK-TH Series Temperature and Humidity Controlled Environmental Test Chamber

Overview

The OK-TH Series Temperature and Humidity Controlled Environmental Test Chamber is an engineered solution for precise, repeatable simulation of climatic stress conditions in laboratory and industrial quality assurance environments. Based on forced-air convection thermodynamics and vapor compression refrigeration principles, the chamber delivers stable, programmable control over temperature and relative humidity across wide operational ranges. Its architecture supports both steady-state and cyclic environmental profiles—critical for evaluating material stability, electronic component reliability, packaging integrity, and accelerated aging behavior under defined thermal and hygroscopic loads. Designed to meet stringent international test standards—including MIL-STD-810G, IEC 60068-2 series, and GB/T 2423—this chamber serves as a foundational platform for environmental qualification testing in aerospace, automotive, medical device, and electronics manufacturing sectors.

Key Features

• Modular chamber configurations: Six standard internal volume options (80 L to 1000 L), each fully customizable in internal dimensions to accommodate user-specific product footprints and fixture requirements.
• Dual-stage refrigeration system using environmentally compliant R404A/R23 refrigerants, enabling rapid cooling down to -70 °C while maintaining low acoustic emission (<65 dB(A)) and long-term operational reliability.
• High-precision digital control system with 7-inch TFT LCD touchscreen, supporting real-time monitoring, multi-segment programming, alarm logging, and data export via USB or RS485 interface.
• Uniform airflow design with adjustable rear-mounted centrifugal blower ensures temperature deviation ≤ ±0.5 °C and humidity deviation ≤ ±2.5 %RH across the working volume—verified per IEC 60068-3-5 calibration protocols.
• Robust construction using electropolished SUS#304 stainless steel for inner chamber walls, door gasket, and shelving; corrosion-resistant exterior housing with reinforced structural frame.
• Standard accessories include one 50 mm diameter cable port, two adjustable stainless steel shelves, four casters with locking mechanism, and four leveling feet for vibration-isolated installation.

Sample Compatibility & Compliance

The OK-TH chamber accommodates diverse sample types—from PCB assemblies and polymer components to pharmaceutical packaging and composite laminates—without requiring modification to core hardware. Internal chamber geometry permits vertical or horizontal orientation of fixtures, while optional humidity recovery systems enable extended operation at ultra-low RH (5–10 %RH) for desiccation studies. All models are pre-validated against key regulatory frameworks: compliance documentation includes traceable calibration certificates per ISO/IEC 17025-accredited procedures, and full alignment with MIL-STD-810G methods for high/low temperature and damp heat exposure. For regulated industries, optional audit-ready software modules support 21 CFR Part 11-compliant electronic signatures, user access control, and immutable event logging—facilitating GLP/GMP-aligned validation and requalification workflows.

Software & Data Management

The embedded controller firmware supports up to 99 programmable test cycles, each comprising 99 steps with independent ramp/soak parameters for temperature and humidity. Data acquisition occurs at 1-second intervals, with local storage capacity for ≥30 days of continuous 4-channel logging (chamber T/RH, setpoint, alarm status). Optional PC-based software (OK-Log Pro v3.2) provides graphical trend analysis, statistical process reporting (CPK, sigma level), automated PDF report generation, and integration with enterprise LIMS or MES platforms via OPC UA or Modbus TCP. All data files are timestamped, digitally signed, and exportable in CSV, XML, or PDF/A-1b formats to satisfy archival requirements under ISO 9001:2015 Clause 7.5.3.

Applications

• Environmental stress screening (ESS) of electronic subassemblies prior to burn-in or HALT/HASS protocols.
• Accelerated shelf-life testing of moisture-sensitive medical devices and sterile barrier systems (per ISO 11607).
• Thermal cycling validation of lithium-ion battery packs under combined temperature-humidity load (UN 38.3 Section 40.3).
• Material compatibility assessment for adhesives, sealants, and elastomers exposed to tropical or arctic climatic profiles.
• Pre-compliance verification for CE marking (EN 60068-2 series) and FCC Part 15B environmental immunity testing.

FAQ

Is this chamber suitable for continuous operation at -40 °C and 95 %RH?
Yes—the dual-stage refrigeration system and optimized humidification path ensure stable operation within this demanding quadrant for durations exceeding 1,000 hours, subject to routine maintenance per manufacturer guidelines.

Can the controller be configured for remote monitoring via Ethernet or Wi-Fi?
Standard models include RS485 and USB ports; Ethernet connectivity and cloud-based telemetry require the optional OK-Net Gateway module, which supports TLS 1.2 encryption and MQTT protocol integration.

What calibration documentation is provided upon delivery?
Each unit ships with a factory calibration certificate covering temperature (NIST-traceable Pt100 sensors) and humidity (capacitive RH transducers), validated across three points per range per IEC 60068-3-5 Annex B.

Are custom internal modifications—such as additional ports or non-standard shelving—available?
Yes. OK Engineering offers OEM integration services including CNC-machined mounting rails, vacuum feedthroughs, and EMI-shielded viewports—subject to mechanical feasibility review and lead-time confirmation.

Does the chamber comply with energy efficiency regulations such as EU Ecodesign Directive 2019/2021?
All OK-TH models meet Tier 2 efficiency thresholds per EN 15804+A2:2019, with verified power consumption <1.8 kW·h/m³·cycle under standard test conditions (25 °C/60 %RH soak).