OK Instruments OK-TH-1 Intelligent Temperature and Humidity Controlled Environmental Test Chamber

Overview

The OK Instruments OK-TH-1 Intelligent Temperature and Humidity Controlled Environmental Test Chamber is an engineered platform for precise, repeatable simulation of climatic conditions in laboratory and industrial quality assurance environments. It operates on the fundamental principle of closed-loop environmental control—integrating thermoelectric heating, refrigerant-based cooling (R404A/R407C compatible), steam-generation or shallow-pan humidification, and condensate-driven dehumidification—to maintain user-defined temperature and relative humidity profiles across a wide operational envelope. Designed for compliance-critical testing protocols—including IEC 60068-2, GB/T 2423, MIL-STD-810, and JIS C 0021—the chamber delivers stable thermal-hygrometric conditions essential for evaluating material stability, electronic component reliability, pharmaceutical product shelf-life, and polymer aging behavior. Its benchtop form factor supports integration into compact QA labs while retaining the structural integrity and thermal inertia required for high-reproducibility testing.

Key Features

• Advanced dual-loop PID + adaptive algorithm controller with real-time compensation for load variation and ambient drift
• High-resolution capacitive RH sensor (±1.5 % RH accuracy) and Class A PT100 temperature probes (±0.15 °C at 25 °C) mounted at multiple chamber locations
• Multi-segment programmable profile capability (up to 1000 steps), supporting complex cycles such as ramp-hold-soak, humidity cycling, dew-point tracking, and thermal shock emulation
• 7-inch full-color TFT touchscreen interface with graphical trend display, alarm history log, and intuitive drag-and-drop program editing
• Embedded Ethernet (TCP/IP), RS-485 Modbus RTU, and optional Wi-Fi/4G modules enabling remote monitoring, control, and firmware updates via web browser or dedicated desktop/mobile application
• Dual-stage safety architecture: independent mechanical over-temperature cutoff, compressor phase-loss protection, low-water-level interlock, and automatic defrost management with anti-ice buildup logic
• Energy-optimized operation via variable-speed centrifugal circulation fan and intelligent refrigeration staging based on real-time thermal load estimation

Sample Compatibility & Compliance

The OK-TH-1 accommodates test specimens up to 600 mm (W) × 500 mm (D) × 400 mm (H), with uniform airflow distribution ensuring ≤ ±2 °C spatial temperature deviation and ≤ ±3 % RH humidity gradient per IEC 60068-3-5 requirements. Stainless steel (SUS304) interior and double-wall insulation (polyurethane foam, ≥100 mm thickness) minimize thermal bridging and external heat exchange. The chamber meets structural and performance criteria outlined in ISO/IEC 17025-accredited laboratories for environmental testing, and its data logging architecture supports audit-ready traceability under GLP and GMP frameworks. Optional validation packages include IQ/OQ documentation templates aligned with FDA 21 CFR Part 11 requirements for electronic records and signatures.

Software & Data Management

Data acquisition occurs at configurable intervals (1–60 seconds), recording time-stamped temperature, humidity, system status flags, and event triggers (e.g., door open, power interruption). All logs are stored internally on non-volatile flash memory (≥16 GB) with cyclic overwrite protection. Export formats include CSV and Excel-compatible .xlsx; USB 2.0 host port enables direct transfer to external drives. Network-enabled units support secure HTTP/S and FTP/S protocols for scheduled uploads to local servers or validated cloud platforms. Audit trail functionality captures operator ID, parameter changes, and calibration events with immutable timestamps—fully compliant with ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available).

Applications

• Electronics reliability testing: PCB solder joint fatigue, battery cycle life under humid heat, LED lumen depreciation at elevated RH
• Automotive component validation: ECU moisture ingress resistance, rubber seal compression set at −40 °C, HVAC actuator hysteresis in thermal cycling
• Pharmaceutical stability studies: ICH Q1A(R3) long-term and accelerated storage condition simulation (e.g., 25 °C/60 % RH, 40 °C/75 % RH)
• Polymer and composite evaluation: Tg shift analysis, hydrolytic degradation kinetics, dimensional stability of injection-molded parts
• Food packaging barrier performance: WVTR correlation under controlled RH gradients, seal integrity under thermal stress
• Academic research: Microbial growth inhibition thresholds, enzymatic reaction rate dependence on water activity (a_w)

FAQ

What standards does the OK-TH-1 comply with for temperature and humidity uniformity verification?
The chamber conforms to IEC 60068-3-5 for uniformity assessment and supports user-executed validation per ASTM E2293 or internal SOPs using NIST-traceable reference sensors.
Can the controller be configured for 21 CFR Part 11 compliance?
Yes—when equipped with optional user access control, electronic signature modules, and audit trail logging enabled, the system satisfies core Part 11 requirements for regulated environments.
Is remote firmware update supported over Ethernet?
Firmware updates are performed securely via HTTPS upload through the embedded web interface, with version rollback capability and SHA-256 integrity verification.
What is the maximum allowable sample mass without compromising chamber performance?
For optimal thermal recovery and humidity stability, total sample mass should not exceed 30 kg; heavier loads require extended stabilization time and may affect specified fluctuation tolerances.
Does the unit support dry-wet cycling per ISO 9223?
Yes—the programmable controller allows sequential execution of dry (≤10 % RH) and saturated (≥95 % RH) phases with defined transition ramps, meeting corrosion testing protocol requirements.