OK-TH Series Precision Temperature and Humidity Controlled Environmental Test Chamber

Overview

The OK-TH Series Precision Temperature and Humidity Controlled Environmental Test Chamber is an engineered solution for accelerated environmental stress testing of electronic components, aerospace subsystems, automotive ECUs, medical devices, and industrial materials. Based on forced-air convection and dual-stage refrigeration architecture, the chamber delivers stable, repeatable thermal-hygrometric profiles across a wide operational envelope—from deep cryogenic conditions (-70 °C) to high-temperature dry heat (+150 °C), combined with controlled humidity ranging from 20 %RH to 98 %RH. Its design adheres to fundamental thermodynamic principles governing moisture diffusion and phase transition behavior in test specimens, enabling reliable simulation of real-world storage, transport, and operational environments. The system is not intended for sterilization or process curing but strictly for qualification, validation, and reliability assessment under defined climatic stressors per international test standards.

Key Features

• Full-color 7-inch TFT touchscreen controller with intuitive menu navigation and dual-language support (English/Chinese), supporting programmable multi-step profiles with up to 99 segments and 999 cycles.
• SUS#304 stainless steel construction throughout inner chamber, insulation layer, and outer housing—resistant to corrosion, thermal fatigue, and condensate accumulation.
• Double-sealed door assembly featuring high-tensile silicone gasket and magnetic latch mechanism, ensuring leakage rate <0.5 L/min at 25 °C/60 %RH (measured per ISO 16750-4 Annex C).
• Multi-layer observation window with embedded transparent conductive oxide (ITO) heating film prevents fogging during low-temperature/humidity transitions while maintaining optical clarity (transmittance >85 %).
• Integrated safety architecture including over-temperature cut-off, compressor high-pressure shutdown, humidity sensor fault detection, and emergency power disconnect—each triggering audible/visual alarm and automatic system halt.
• Standard 50 mm diameter feedthrough port (left-side mounted), compatible with shielded signal cables, thermocouple leads, or pneumatic lines without compromising chamber integrity.

Sample Compatibility & Compliance

The OK-TH chamber accommodates samples up to 100 L volume (OK-TH-1000 model) with unrestricted airflow geometry due to optimized internal ducting and centrifugal blower configuration. It supports both static and dynamic loading configurations—ideal for PCB assemblies, battery modules, polymer housings, and coated substrates. All models are verified against key regulatory and industry benchmarks: MIL-STD-810G Method 501.6 (High Temperature), 502.6 (Low Temperature), and 507.5 (Humidity); IEC 60068-2 series (Environmental Testing Parts 1–4); and corresponding Chinese national standards GB/T 2423.1–2423.4. While not certified to UL 61010-1 or CE Machinery Directive out-of-the-box, the unit complies with EMC emission limits per CISPR 11 Group 1 Class B and meets basic safety requirements when installed per manufacturer-specified grounding and ventilation protocols.

Software & Data Management

The embedded controller logs temperature and humidity data at user-selectable intervals (1–600 seconds), storing up to 10,000 data points internally. Optional PC-based software (OK-LogView Pro) enables real-time remote monitoring via Ethernet or RS485, CSV export with timestamped metadata, and compliance-ready report generation—including deviation alerts, pass/fail status per test step, and audit trail timestamps. For regulated environments (e.g., ISO 13485-certified medical device labs or ICH Q5/Q7-compliant pharma QC), optional 21 CFR Part 11-compliant firmware upgrade provides electronic signature capability, role-based access control, and immutable data archiving with SHA-256 hash verification.

Applications

This chamber serves as a core tool in product development and quality assurance workflows. Typical use cases include: thermal cycling validation of automotive ADAS sensors per ISO 16750-4; humidity-induced corrosion testing of printed circuit board finishes (IPC-J-STD-006); shelf-life acceleration studies for pharmaceutical packaging under ICH Q1A(R2) guidelines; evaluation of adhesive bond strength retention after damp heat exposure (ASTM D1002); and qualification of lithium-ion battery enclosures under combined thermal-hygrometric stress (UN 38.3 Section 40.3). Its repeatability (±0.5 °C uniformity, ±2.5 %RH) ensures inter-laboratory comparability when operated within calibrated traceability chains.

FAQ

Does this chamber support custom calibration certificates traceable to NIST or PTB?
Yes—factory calibration reports are issued with uncertainty budgets per ISO/IEC 17025:2017, and third-party accredited calibration services (e.g., A2LA-accredited labs) can be arranged upon order.

Can the controller log data directly to a network drive or cloud platform?
Native controller logging is local only; however, OK-LogView Pro supports scheduled FTP/SFTP upload to designated servers or NAS devices.

What maintenance intervals are recommended for long-term reliability?
Compressor oil inspection every 24 months; condenser coil cleaning quarterly; humidity sensor recalibration annually or after 2000 operational hours.

Is the chamber suitable for testing lithium metal batteries under UN 38.3 thermal shock requirements?
Yes—models with -40 °C to +150 °C range meet thermal shock profile specifications in Section 40.3; optional explosion-proof modifications available upon engineering review.

How is humidity generated and controlled without introducing contaminants?
Steam humidification via stainless steel immersion heater with deionized water supply; no ultrasonic misting or chemical additives used—ensuring zero residue deposition on sensitive optics or electronics.