OK Environmental Test Chamber OK-STH-Series Walk-in Temperature & Humidity Chamber
| Brand | OK Instruments |
|---|---|
| Origin | Guangdong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | OK-STH-Volume.0 |
| Price | USD 11,200 (FOB Guangdong) |
| Internal Dimensions (D×W×H) | Customizable |
| Temperature Range | −70 °C to +150 °C |
| Temperature Uniformity | ±3 °C |
| Temperature Control Accuracy | ±1 °C |
| Heating Rate | Up to 3 °C/min |
| Cooling Rate | Up to 1 °C/min |
| Humidity Range | 20–98% RH (at ≥10 °C) |
| Humidity Control Accuracy | ±2.5% RH |
Overview
The OK-STH-Series Walk-in Environmental Test Chamber is an industrial-grade, fully customizable walk-in chamber engineered for long-duration, high-fidelity environmental simulation of large-scale test specimens—including complete assemblies, automotive components, aerospace subsystems, and electronic enclosures. Designed around a dual-mode thermodynamic control architecture, it employs independent refrigeration and steam-based humidification systems coupled with a precision-balanced air distribution manifold to achieve stable, uniform thermal and hygrothermal conditions across volumetric workspaces exceeding 10 m³. Its operational envelope spans −70 °C to +150 °C and 20–98% RH (above 10 °C), supporting standardized test protocols per IEC 60068-2, MIL-STD-810H, ASTM D4332, and GB/T 2423 series. The chamber integrates a fail-safe mechanical interlock system, redundant sensor monitoring, and structural compliance with GB 8624–2012 Class B2 combustibility requirements for insulated panel materials.
Key Features
- Modular double-skin insulated panel construction using 50–100 mm thick polyurethane (PU), expanded polystyrene (EPS), or rock wool core with 0.326–0.5 mm pre-painted steel cladding—fully compliant with GB 8624–2012 B2 fire rating.
- Structural support frame fabricated from galvanized steel beams and aluminum extrusions; interior and exterior edges finished with stainless steel or anodized aluminum trim for durability and cleanability.
- Intelligent air circulation system featuring adjustable axial fans, multi-directional diffusers, and a recirculation duct network optimized for spatial uniformity (±3 °C temperature deviation, ±2.5% RH deviation at steady state).
- PLC-based control system with 7-inch TFT touchscreen HMI (OK 7751 programmable controller); optional upgrade to OYO 5461 controller with Ethernet/IP and Modbus TCP interfaces.
- Auto-select refrigeration circuit logic enables direct compressor start-up during high-temperature soak phases—eliminating thermal shock and reducing cycle transition time.
- Integrated safety suite includes over-temperature cutout, phase-loss protection, water-level monitoring for humidifier, ground-fault circuit interrupter (GFCI), and door-mounted emergency stop.
Sample Compatibility & Compliance
The OK-STH chamber accommodates full-size prototypes, production-line units, and rack-mounted equipment up to user-defined internal dimensions (standard configurations range from 3 to 50 m³). Its open-floor layout supports integration with external power feeds, data acquisition harnesses, and fluid supply lines via dedicated service penetrations. All thermal and humidity profiles are traceable and auditable under GLP and GMP frameworks. Optional validation packages include IQ/OQ documentation aligned with ISO/IEC 17025 and FDA 21 CFR Part 11 requirements for electronic records and signatures. Humidity generation utilizes stainless-steel steam generators with PID-controlled saturation, ensuring low particulate output and minimal mineral residue accumulation.
Software & Data Management
The embedded controller logs all process variables—including chamber setpoints, real-time sensor readings (PT100 ×6, capacitive RH ×2), compressor status, heater duty cycle, and alarm history—at configurable intervals (1 s to 60 min). Data export is supported via USB mass storage or Ethernet to CSV or binary formats. Optional PC-based software (OK-EnviroLog Pro) provides remote supervision, multi-chamber fleet management, statistical process control (SPC) charting, and automated report generation compliant with ISO 14644-3 Annex B for environmental monitoring records. Audit trails retain operator IDs, timestamped parameter changes, and firmware revision metadata.
Applications
- Environmental stress screening (ESS) of avionics modules per MIL-STD-2164A.
- Accelerated aging of battery packs under combined thermal cycling and humidity load.
- Validation of HVAC system performance in simulated outdoor ambient extremes.
- Reliability testing of medical device enclosures under IEC 60601-1 Clause 11 (environmental conditions).
- Material compatibility assessment of adhesives, sealants, and composite laminates per ASTM D5229/D5229M.
- Stability chamber qualification for pharmaceutical packaging per USP and ICH Q1A(R2).
FAQ
What is the standard lead time for a custom OK-STH chamber?
Typical manufacturing and factory acceptance testing (FAT) requires 12–16 weeks after final dimensional and functional specifications are approved.
Can the chamber be validated for ISO 17025-compliant calibration?
Yes—OK Instruments provides optional on-site SAT (Site Acceptance Testing) with NIST-traceable sensors and uncertainty budgets per ISO/IEC 17025 Annex A.3.
Is remote monitoring supported via cloud platform?
The base controller supports SNMP and Modbus TCP; cloud connectivity requires OK-EnviroLink gateway (sold separately) with TLS 1.2 encryption and role-based access control.
What maintenance intervals are recommended for the refrigeration system?
Compressor oil analysis and filter dryer replacement every 24 months; annual inspection of condenser coils, humidifier electrodes, and sensor calibration verification.
Does the chamber meet CE marking requirements for export to the EU?
CE marking is available upon request for EU-supplied units, subject to full EN 61000-6-2/6-4 EMC testing and EN 61010-1 safety certification by an EU Notified Body.
