OK KS-TH-408.0 Rapid Temperature and Humidity Cycling Chamber

Overview

The OK KS-TH-408.0 Rapid Temperature and Humidity Cycling Chamber is an engineered environmental stress screening (ESS) system designed for accelerated reliability validation under combined thermal and hygrothermal stresses. It operates on a dual-refrigeration cascade architecture—employing high-efficiency compressors (e.g., Bitzer or Tecumseh) and optimized refrigerant circuits—to achieve precise, repeatable temperature transitions across a wide operational envelope. Unlike conventional climatic chambers limited to 1–3 °C/min ramp rates, this chamber delivers programmable linear ramp profiles up to 15 °C/min within defined segments (e.g., −40 °C ↔ +85 °C), enabling realistic simulation of rapid ambient shifts encountered during aircraft ascent/descent, automotive engine bay transients, or outdoor electronics deployment in monsoonal climates. Humidity control is implemented via steam injection and precision dew-point regulation, maintaining traceable RH stability ±2 %RH over the functional range of +10 °C to +95 °C. The chamber’s structural integrity, insulation performance (≥120 mm polyurethane foam with vacuum-sealed panels), and PID-based multi-loop control ensure long-term repeatability required for qualification testing per international standards.

Key Features

• High-speed thermal cycling: Programmable ramp rates of 5, 10, or 15 °C/min (linear segment average), verified per IEC 60068-3-5 and GJB 150.5A
• Extended climatic envelope: −70 °C to +150 °C temperature range; 20–98 %RH humidity control (operational only between +10 °C and +95 °C)
• Cascade refrigeration system: Dual-stage compressor configuration with R404A/R23 refrigerants, enabling stable sub-zero operation and rapid heat extraction
• Intelligent control interface: 10.4″ color touchscreen HMI with ≥1000-segment program storage, real-time trend logging, and USB/RS485/Ethernet connectivity
• Comprehensive safety architecture: Triple independent over-temperature protection, phase-failure detection, refrigerant pressure monitoring, door interlock, and leak-proof steam generator housing
• Structural robustness: Stainless steel inner chamber (SUS304), reinforced insulated double-wall construction, and vibration-damped mounting base for lab-grade stability

Sample Compatibility & Compliance

The KS-TH-408.0 accommodates samples up to 350 mm × 350 mm × 350 mm (W×D×H) with uniform airflow distribution ensured by a rear-mounted centrifugal blower and adjustable baffle system. Its thermal uniformity meets ±1.5 °C (at steady state) and ±2.0 °C (during dynamic ramps) across the working volume—validated per IEC 60068-3-5 Annex B. Humidity uniformity is maintained at ±3 %RH under static conditions. The system supports full compliance documentation packages, including factory calibration certificates (traceable to NIM), IQ/OQ protocols, and optional 21 CFR Part 11-compliant audit trails when paired with OK’s LabControl Suite v4.x software. It aligns with test method requirements in GB/T 2423.22 (temperature shock), GB/T 2423.34 (combined temperature/humidity cyclic), IEC 60068-2-14 (change of temperature), and MIL-STD-810H Method 503.5.

Software & Data Management

Standard firmware includes embedded data logging at user-selectable intervals (1–600 seconds), with internal memory retention for ≥30 days of continuous operation. Optional LabControl Suite v4.x provides PC-based remote supervision, multi-chamber synchronization, automated report generation (PDF/CSV), and GLP/GMP-ready electronic signatures. All logged parameters—including chamber setpoint, actual temperature/humidity, compressor status, alarm history, and ramp deviation metrics—are timestamped and stored with SHA-256 checksum integrity verification. Audit trail functionality records operator login/logout events, parameter modifications, and test start/stop commands—fully compliant with FDA 21 CFR Part 11 requirements when configured with domain-authenticated network access and role-based permissions.

Applications

• Automotive electronics: Validation of ADAS sensors, infotainment modules, and battery management systems under ISO 16750-4 thermal shock and humidity cycling profiles
• Consumer electronics: Accelerated life testing of smartphones, wearables, and IoT edge devices per JEDEC JESD22-A104E and A110B
• Aerospace components: Environmental qualification of avionics enclosures and connectors per RTCA DO-160 Section 5 and MIL-STD-810H
• Energy storage systems: Cycle testing of lithium-ion battery packs under UL 1642 and IEC 62619-relevant thermal-hygric stress sequences
• Materials science: Polymer aging studies, conformal coating adhesion assessment, and PCB delamination analysis under controlled thermal-humidity gradients
• Medical device packaging: ASTM F1980-compliant accelerated aging simulations for sterile barrier systems

FAQ

What is the difference between “average ramp rate” and “instantaneous ramp rate” in specification sheets?
The stated ramp rate (e.g., 10 °C/min) refers to the linear average over a defined temperature transition segment—not peak instantaneous velocity. OK specifies ramp performance per IEC 60068-3-5, measuring mean slope between two calibrated points (e.g., −40 °C and +85 °C) with dwell time excluded.
Can this chamber perform temperature-only cycling without humidity control?
Yes. Humidity can be fully disabled or held constant at any value within its operational range while executing arbitrary temperature profiles—including ultra-fast thermal shocks down to 15 °C/min.
Is third-party calibration and certification available?
OK provides optional NIST-traceable calibration services through CNAS-accredited partners, including full uncertainty budgets and ISO/IEC 17025-compliant certificates upon request.
What electrical supply is required for full-power operation?
The KS-TH-408.0 requires a dedicated 3-phase 380 V ±10 %, 50 Hz supply with minimum 32 A circuit breaker and proper grounding—verified prior to installation per IEC 61000-3-12.
How is condensation managed during rapid cooling with active humidity?
The chamber employs pre-cooled dehumidification coils and timed steam purge cycles to prevent condensate accumulation on samples or chamber walls during descent phases.