Other Brands OK-TH Series High-Low Temperature Environmental Test Chamber

Overview

The OK-TH Series High-Low Temperature Environmental Test Chamber is an engineered solution for accelerated environmental stress testing of electronic components, automotive modules, aerospace hardware, and industrial materials under precisely controlled thermal and hygrothermal conditions. Based on the principle of forced-air convection combined with multi-stage vapor-compression refrigeration and PID-regulated electric heating, this chamber delivers stable, repeatable, and traceable temperature and humidity profiles in accordance with internationally recognized test standards. Its robust architecture supports both steady-state and dynamic thermal cycling protocols—critical for reliability validation, qualification testing, and failure mode analysis in R&D, quality assurance, and production environments.

Key Features

• Full-color, high-resolution touchscreen controller with intuitive navigation, real-time data visualization, and seamless English/Chinese language switching—designed for ease of use across multinational engineering teams.
• Dual-stage hermetic refrigeration system utilizing environmentally compliant refrigerants (R404A for primary stage, R23 for ultra-low sub-zero operation), enabling reliable performance down to –70°C without cryogenic consumables.
• Chamber interior and exterior constructed entirely from electropolished SUS#304 stainless steel—resistant to corrosion, oxidation, and cleaning agents used in GMP/GLP-compliant laboratories.
• Multi-layer insulated observation window with integrated indium tin oxide (ITO) conductive film ensures unobstructed, fog-free visibility during high-humidity or condensing cycles while maintaining thermal integrity.
• Single 50 mm diameter test port located on the left side wall, fitted with a silicone gasket and stainless steel flange—compatible with external power feeds, thermocouple leads, or signal cables under full environmental seal.
• Comprehensive safety architecture including over-temperature cutoff, over-humidity lockout, compressor high-pressure shutdown, door-open interlock, and real-time fault logging with on-screen diagnostic codes.

Sample Compatibility & Compliance

The OK-TH series accommodates a broad range of sample geometries and mounting configurations through customizable internal dimensions (from 80 L to 1000 L volume). Standard accessories include two adjustable SUS#304 stainless steel shelves, four locking casters, and four leveling feet—enabling rapid reconfiguration for benchtop or floor-standing deployment. The chamber complies with multiple international test standards, including MIL-STD-810G Method 501.6 (High Temperature), Method 502.6 (Low Temperature), IEC 60068-2-1 (Test A: Cold), IEC 60068-2-2 (Test B: Dry Heat), IEC 60068-2-78 (Test Cab: Damp Heat, Steady State), and IEC 60068-2-30 (Test Db: Damp Heat, Cycling). It supports test execution under ISO/IEC 17025-accredited laboratories and meets essential requirements for GLP documentation workflows and FDA 21 CFR Part 11–aligned audit trails when paired with optional software packages.

Software & Data Management

Equipped with embedded firmware supporting USB data export (CSV format), optional Ethernet/Wi-Fi connectivity enables remote monitoring and integration into centralized laboratory information management systems (LIMS). The controller logs timestamped temperature and humidity values at user-defined intervals (1s–60min), stores up to 100 test programs with 99 segments each, and retains ≥30 days of continuous operational history. Optional PC-based software provides advanced features including real-time graphing, deviation alarms, report generation (PDF/Excel), and electronic signature support—facilitating compliance with ISO 9001, IATF 16949, and aerospace AS9100 quality management frameworks.

Applications

• Thermal cycling validation of PCBAs, sensors, and semiconductor packaging prior to field deployment.
• Environmental stress screening (ESS) of avionics modules per DO-160 Section 4 and MIL-STD-810H.
• Material aging studies—including polymers, adhesives, and conformal coatings—under combined temperature/humidity exposure.
• Pre-conditioning of lithium-ion battery cells before electrical performance testing (e.g., cycle life, impedance spectroscopy).
• Verification of sealing integrity and condensation resistance in IP-rated enclosures and medical device housings.
• Calibration verification of temperature/humidity sensors and data loggers against NIST-traceable references.

FAQ

What temperature and humidity ranges are standard across all OK-TH models?
Standard temperature range is –20°C to +150°C; extended options include –40°C and –70°C variants. Humidity range is 20–98% RH as standard; optional low-end extension to 5% RH or high-end extension to 10% RH is available upon request.

Is the chamber suitable for continuous operation in a Class 10,000 cleanroom environment?
Yes—the fully welded SUS#304 construction, absence of internal paint or organic gaskets, and low particulate emission profile make it compatible with ISO 14644-1 Class 7 (Class 10,000) cleanroom installations when installed with appropriate HVAC integration.

Can the controller be configured to meet 21 CFR Part 11 requirements for electronic records?
The base controller supports audit trail logging and user-level access control. Full 21 CFR Part 11 compliance—including electronic signatures, role-based permissions, and immutable record retention—requires the optional validated software package and documented IQ/OQ protocol execution.

What refrigerant is used, and is it compliant with current EU F-Gas Regulation?
The system uses R404A (GWP = 3922) and R23 (GWP = 14800) in a cascade configuration. While compliant with current global equipment safety standards, users operating within the EU should consult local regulatory guidance regarding phase-down timelines and consider future retrofitting to lower-GWP alternatives such as R449A or R452A.

Does the chamber support ramp-soak-cycle programming for thermal shock simulation?
The standard controller supports multi-segment ramp/soak profiles but does not provide true two-chamber thermal shock functionality. For rapid transition testing (e.g., –55°C ↔ +125°C in <15 sec), a dedicated thermal shock chamber is recommended.