English Product Name

Overview

The OK-TH Series High-Low Temperature Cycling Environmental Test Chamber is a precision-engineered climatic simulation system designed for rigorous thermal and hygrothermal stress testing of industrial components and materials. Operating on the principle of forced-air convection with dual-stage refrigeration and PID-controlled heating, it delivers stable, repeatable environmental profiles across wide operational ranges—from deep cryogenic conditions (-70 °C) to elevated temperatures (+150 °C), combined with programmable humidity control (20–98 %RH). This architecture enables standardized evaluation of product reliability under accelerated aging, thermal shock, condensation, and freeze-thaw cycling—critical for qualification per IEC 60068-2, MIL-STD-810, GB/T 2423, and ISO 16750-4 protocols. The chamber’s fully welded SUS#304 stainless steel construction ensures long-term corrosion resistance in high-humidity and saline environments, while its hermetic refrigeration circuit minimizes maintenance intervals and supports continuous unattended operation over extended test durations.

Key Features

• Full-color 7-inch TFT touchscreen controller with real-time graphical trend display, multi-segment programmability (up to 99 cycles × 99 steps), and intuitive English/Chinese language switching—compliant with ISO 9001 documentation requirements.
• Dual-stage cascade refrigeration system utilizing environmentally compliant R404A (high stage) and R23 (low stage) refrigerants, enabling rapid cooling to -70 °C without liquid nitrogen dependency.
• Uniform airflow design with rear-mounted centrifugal blower and optimized baffle configuration ensures temperature uniformity ≤ ±0.5 °C and humidity uniformity ≤ ±2.5 %RH throughout the working volume (per ASTM E145 Class II validation criteria).
• Integrated safety architecture: independent mechanical over-temperature cut-off, refrigerant pressure monitoring, door interlock switch, and automatic power disconnection upon sensor failure or abnormal current draw.
• Standard 50 mm diameter test port (left-side, EPDM-sealed) facilitates external signal/power feedthrough; optional brass compression fittings available for vacuum-rated applications.
• Multi-layer observation window with embedded ITO conductive film prevents fogging during low-temperature/humidity transitions, enabling uninterrupted visual monitoring without compromising chamber integrity.

Sample Compatibility & Compliance

The OK-TH chamber accommodates diverse sample geometries—from PCB assemblies and automotive ECUs to polymer specimens and aerospace fasteners—via its modular shelf system (two adjustable SUS#304 trays included). Its internal dimensions range from 80 L (OK-TH-80) to 1000 L (OK-TH-1000), supporting both single-unit qualification and batch-level validation. All models meet electromagnetic compatibility (EMC) requirements per EN 61326-1 and are CE-marked for use within EU-regulated laboratories. For regulated industries, the controller supports audit-trail-enabled data logging (CSV export) compatible with FDA 21 CFR Part 11-compliant systems when paired with validated third-party software. Calibration certificates traceable to NIST or PTB standards are available upon request for GLP/GMP-aligned quality assurance workflows.

Software & Data Management

The embedded controller provides local data storage (≥10,000 hours of 1-second interval logging) and USB export capability. Optional PC-based software (OK-Link v3.2) enables remote monitoring, automated report generation (PDF/Excel), alarm escalation via email/SMS, and comparative analysis across multiple test runs. Raw data includes timestamped temperature, humidity, setpoint deviation, and compressor runtime—structured to align with ISO/IEC 17025 uncertainty budgeting requirements. Historical logs retain full metadata (operator ID, test ID, calibration status), satisfying traceability mandates in automotive PPAP submissions and pharmaceutical stability studies (ICH Q1A–Q1E).

Applications

• Electronics: Thermal cycling validation of solder joints (JEDEC JESD22-A104), moisture sensitivity level (MSL) screening, and conformal coating adhesion testing.
• Automotive: Component endurance under ISO 16750-4 temperature/humidity profiles; battery module thermal runaway propagation studies.
• Aerospace: Environmental stress screening (ESS) of avionics per RTCA DO-160 Section 4 & 5; composite material outgassing characterization.
• Materials Science: Polymer crystallinity assessment via controlled cooling ramp rates; paint/coating blistering and adhesion loss quantification.
• Quality Assurance: In-process verification of production line environmental controls; supplier incoming inspection against contractual spec limits.

FAQ

What temperature and humidity profiles can be programmed?

Up to 99 programmable cycles, each containing 99 time-temperature-humidity steps—including ramp, soak, and dwell phases—with independent control of heating/cooling rates and humidity saturation dynamics.

Is the chamber suitable for HALT/HASS testing?

While not rated for high-acceleration thermal shock (e.g., >15 °C/min), its ±0.5 °C uniformity and dual-stage refrigeration support moderate-profile highly accelerated life testing when integrated with external vibration tables.

How is calibration maintained over time?

Two calibrated Pt100 sensors (working + reference) are factory-installed; annual verification using NIST-traceable dry-block calibrators is recommended per ISO/IEC 17025 Clause 6.5.

Can the test port accommodate thermocouple feedthroughs?

Yes—the 50 mm port accepts standard miniature thermocouple connectors (e.g., Omega PRS series) with optional silicone grommets to maintain seal integrity at extreme temperatures.

What electrical infrastructure is required beyond the supplied cable?

A dedicated 3-phase 5-wire circuit with upstream 63 A breaker, isolated grounding rod, and voltage stabilization (±5 % tolerance) is mandatory; uninterruptible power supply (UPS) integration is advised for tests exceeding 72 hours.