OK-STH-8.35m² Walk-in Constant Temperature & Humidity Test Chamber
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | OK-STH-8.35m² |
| Internal Dimensions (D×W×H) | 2000 × 2000 × 2000 mm |
| Temperature Range Options | A: 0°C / B: −20°C / C: −40°C / D: −60°C / E: −70°C |
| Temperature Uniformity | ±3°C |
| Temperature Control Accuracy | ±1°C |
| Heating Rate | 1.0–4.0°C/min |
Overview
The OK-STH-8.35m² Walk-in Constant Temperature & Humidity Test Chamber is a large-scale environmental simulation system engineered for system-level reliability validation under controlled thermal and hygrothermal conditions. Unlike benchtop or upright climate chambers, this walk-in chamber features an internal volume of 8.35 m³—sufficient to accommodate full-scale assemblies, multi-unit batches, or entire operational systems. It operates on the principle of forced-air convection with dual-stage refrigeration (cascade compression cycle), precision PID-controlled electric heating, and integrated steam-based humidification. The chamber maintains stable, uniform temperature and relative humidity (RH) profiles across its entire working space, enabling long-duration steady-state testing per ISO 16750-4, ASTM D4332, IEC 60068-2-30, and MIL-STD-810H Method 507.5. Its structural architecture—comprising high-density polyurethane-insulated sandwich panels, reinforced steel framing, and a hermetically sealed access door with anti-frost heating—ensures minimal thermal leakage and long-term operational integrity in industrial laboratory and production validation environments.
Key Features
- Walk-in design with fully accessible interior (2000 × 2000 × 2000 mm usable space), allowing direct operator entry for sample loading, sensor placement, and real-time instrumentation setup
- Cascade refrigeration system with dual compressors (high-stage R404A / low-stage R23) supporting extended low-temperature operation down to −70°C
- Steam-type humidification system with stainless-steel boiler and PID-controlled RH regulation (typically 20–98% RH, depending on temperature setpoint)
- High-volume centrifugal air circulation system with optimized ductwork and multiple directional nozzles ensuring temperature uniformity ≤ ±3°C and stability ≤ ±1°C
- Industrial-grade PLC-based controller with 10.4″ color touchscreen interface, programmable multi-step test profiles, real-time trend display, and alarm logging
- Comprehensive safety architecture including over-temperature/over-humidity cut-off, refrigerant pressure monitoring, door interlock, emergency stop, and fire-retardant insulation materials
- Modular panel construction using 150 mm thick PU-filled steel-clad panels (thermal conductivity ≤ 0.022 W/m·K), enabling field assembly, expansion, and maintenance access
Sample Compatibility & Compliance
This chamber accommodates physically large or thermally active test articles—including electric vehicle battery packs, photovoltaic inverters, telecom server racks, aerospace avionics enclosures, and complete automotive HVAC modules. Its load capacity accounts for internal heat dissipation up to 5 kW (configurable), making it suitable for powered-on testing scenarios. All control logic and data handling comply with GLP and GMP documentation requirements. The system supports audit-ready data logging with time-stamped records traceable to NIST-traceable reference sensors. It meets structural and operational provisions of CE Machinery Directive 2006/42/EC, EN 61000-6-2/-6-4 (EMC), and UL 61010-1 safety standards. Optional validation packages include IQ/OQ documentation aligned with FDA 21 CFR Part 11 for regulated life science and medical device applications.
Software & Data Management
The embedded controller runs OK-EnviroControl™ firmware, offering intuitive navigation, customizable parameter thresholds, and password-protected user roles (Operator, Engineer, Administrator). Data is logged at user-selectable intervals (1 s to 60 min) to internal SD card or external USB drive, with CSV export capability. Optional Ethernet/WiFi connectivity enables remote monitoring via web browser or integration into enterprise MES/LIMS platforms using Modbus TCP or OPC UA protocols. All recorded data includes metadata such as chamber ID, operator login, test program name, and calibration status of primary sensors. Audit trails record all configuration changes, manual overrides, and alarm events with timestamps and user IDs—fully compliant with ALCOA+ principles for data integrity in regulated environments.
Applications
- Automotive: Whole-vehicle cold-soak testing, EV battery thermal management validation, cabin HVAC performance under humidified tropical conditions
- Aerospace: Ground-based environmental stress screening of UAV fuselages, radar housings, and flight-critical power supplies
- Energy Storage: Long-term cycling of BESS cabinets at elevated RH (e.g., 85% RH @ 40°C) to assess corrosion resistance and insulation degradation
- Telecommunications: Thermal-hygric soak testing of 5G base station cabinets under simulated coastal or tropical deployment conditions
- Electronics Manufacturing: Batch-level HASS (Highly Accelerated Stress Screening) of PCBAs with combined temperature/humidity stress profiles
- Materials Science: Polymer aging studies, coating adhesion evaluation, and sealant performance assessment under sustained humid heat exposure
FAQ
What is the maximum internal heat load the chamber can handle during operation?
The standard configuration manages up to 3 kW of continuous internal heat dissipation; higher loads (up to 5 kW) require optional enhanced refrigeration and airflow upgrades.
Can the chamber be validated for ISO/IEC 17025-compliant calibration?
Yes—OK Instruments provides optional third-party accredited calibration certificates traceable to national metrology institutes, covering temperature, humidity, and uniformity verification per ISO 17025 requirements.
Is remote access and alarm notification supported?
Standard Ethernet connectivity enables SNMP-based network alarms and HTTP API access for custom SCADA integration; SMS/email alerts require optional gateway module.
Does the system support automated test sequencing across multiple environmental profiles?
Yes—the controller supports up to 100 programmable steps per profile, with conditional branching, dwell times, and automatic transitions between temperature/humidity segments.
What installation infrastructure is required onsite?
Three-phase 380 VAC ±10%, 50 Hz power supply; dedicated floor drainage for condensate; minimum 1.2 m service clearance around all sides; structural floor loading capacity ≥ 12 kN/m².
