OK-TH Series Compact High-Low Temperature & Humidity Environmental Test Chamber

Overview

The OK-TH Series Compact High-Low Temperature & Humidity Environmental Test Chamber is an engineered solution for precise simulation of climatic stress conditions in laboratory and industrial quality assurance environments. Based on forced-air convection thermodynamics and dual-stage refrigeration architecture, the chamber delivers stable, repeatable control over temperature (–70°C to +150°C) and relative humidity (20–98% RH) across six standardized internal volumes—from 80 L to 1000 L. Its design adheres to fundamental principles of thermal equilibrium and psychrometric control, enabling accurate replication of environmental profiles required for reliability validation, accelerated aging, and qualification testing per international standards including IEC 60068-2, MIL-STD-810, and GB/T 2423 series. The system integrates a hermetically sealed, low-noise dual-refrigerant cascade compressor (R404A/R23), ensuring consistent performance under sustained thermal load without condensation-induced instability or refrigerant migration.

Key Features

• High-precision touchscreen controller with real-time graphical display, programmable ramp-soak profiles, and bilingual (English/Chinese) interface—designed for intuitive operation and audit-ready parameter logging.
• SUS#304 stainless steel construction for both inner and outer chambers, offering corrosion resistance, non-outgassing surfaces, and long-term dimensional stability under cyclic thermal stress.
• Double-layer high-tensile silicone gasket sealing between door and frame, minimizing leakage and maintaining chamber integrity during extreme temperature transitions.
• Multi-layer laminated observation window with embedded conductive film heating element—prevents fogging and enables unobstructed visual monitoring of test specimens under all operating conditions.
• Standard 50 mm diameter cable port (left-side mounted), two adjustable stainless steel shelves, four swivel casters with leveling feet, and rear-mounted 3-phase 380 V AC power inlet (2.5 m cable).
• Comprehensive safety architecture: over-temperature, over-humidity, compressor high-pressure, and phase-failure protection—with immediate fault identification displayed on-screen and automatic power cutoff.

Sample Compatibility & Compliance

The OK-TH chamber accommodates a broad range of sample types—including electronic assemblies, automotive components, polymer enclosures, medical device packaging, and aerospace subassemblies—without requiring modification to core chamber geometry. Its uniformity specification (±0.5°C / ±2.5% RH) and stability metrics meet the spatial and temporal requirements defined in IEC 60068-3-5 for climatic test equipment verification. All models are factory-calibrated against NIST-traceable references and support GLP/GMP-compliant operation through configurable alarm thresholds, event-driven data capture, and user-accessible calibration logs. The system satisfies mandatory environmental test clauses in MIL-STD-810G Method 502.5 (Low Temperature), Method 501.5 (High Temperature), and Method 507.5 (Humidity), as well as China’s national standards GB/T 2423.1–2001, GB/T 2423.2–2001, and GB/T 2423.4–1993.

Software & Data Management

The embedded controller supports up to 100 programmable test cycles with 99 segments per cycle, including rate-controlled ramps, dwell periods, and humidity modulation sequences. Data logging occurs at user-selectable intervals (1–600 seconds), storing temperature, humidity, setpoints, alarms, and system status in non-volatile memory. Optional PC-based software enables remote monitoring via Ethernet or RS485, export of CSV-formatted reports, and integration into centralized LIMS or MES platforms. Audit trail functionality complies with FDA 21 CFR Part 11 requirements when paired with user authentication and electronic signature modules. Calibration history, maintenance records, and firmware versioning are retained locally and exportable for regulatory review.

Applications

This chamber is routinely deployed in QC laboratories for incoming material inspection, in R&D settings for thermal cycling validation of PCBAs and battery packs, and in certification labs conducting third-party compliance testing for CE, CCC, and UL mark submissions. Typical use cases include: thermal shock pre-conditioning prior to HALT/HASS; moisture absorption evaluation of hygroscopic composites; shelf-life estimation of pharmaceutical packaging under ICH Q1A(R2) conditions; and environmental stress screening of avionics enclosures per DO-160 Section 4. It also serves as a reference platform for developing custom test protocols aligned with customer-specific reliability roadmaps.

FAQ

What temperature and humidity ranges are standard across all OK-TH models?

All units support selectable temperature ranges from –70°C to +150°C and humidity from 20–98% RH. Extended low-humidity options (5–98% RH) and ultra-low temperature configurations (–70°C) are available as factory-installed options.

Is the chamber suitable for continuous operation at extreme setpoints?

Yes—the dual-stage refrigeration system and reinforced insulation allow uninterrupted operation at –70°C or +150°C for durations exceeding 1,000 hours, provided ambient conditions remain within specified limits (15–30°C, <80% RH).

Can the controller be configured to meet 21 CFR Part 11 requirements?

When equipped with optional user management firmware and external authentication hardware, the system supports electronic signatures, role-based access control, and immutable audit trails—fully compliant with FDA-regulated environments.

Are custom internal dimensions or special ports available?

Yes—OK Instruments provides engineering consultation and mechanical customization, including non-standard chamber volumes, additional cable ports, vacuum feedthroughs, or inert gas purge interfaces, subject to structural integrity validation.

What documentation is provided with shipment?

Each unit ships with a Factory Calibration Certificate (traceable to national standards), Installation & Operation Manual (English), Electrical Safety Report, and Declaration of Conformity referencing applicable IEC, GB, and MIL standards.