Jianhu LTH Series Environmental Stress Screening Chamber (Temperature & Humidity Test Chamber)

Overview

The Jianhu LTH Series Environmental Stress Screening Chamber is a precision-engineered climatic test system designed to replicate complex thermal and hygrothermal stress profiles encountered during product development, qualification, and reliability validation. Operating on the principles of forced-air convection, dual-stage cascade refrigeration, and steam-humidification with PID-controlled saturation, the chamber delivers tightly regulated temperature (−70 °C to +100 °C, optional +150 °C) and relative humidity (10–98 %RH) environments. Its architecture conforms to the fundamental requirements of environmental simulation standards including IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-30 (damp heat, cyclic), JIS C 0021, GB/T 2423.1–2423.4, and MIL-STD-810G Method 502.5/507.5. The system enables controlled execution of temperature cycling, high-temperature storage, low-temperature operational testing, humidity soak, condensation evaluation, and combined environmental stress sequences—critical for assessing material integrity, solder joint fatigue, seal performance, coating adhesion, and electronic component functionality under accelerated aging conditions.

Key Features

• Imported Japanese programmable controller with industrial-grade 7-inch color touchscreen interface, supporting real-time multi-curve visualization (temperature, humidity, ramp rate, dwell time)
• Dual-language UI (English/Chinese) with configurable user access levels and parameter modification lockout to ensure test integrity and audit readiness
• Slope-based simultaneous temperature/humidity ramp control algorithm minimizes condensation risk during transitions and improves profile fidelity
• High-efficiency cascade refrigeration system using environmentally compliant HFC refrigerants, paired with robust European-sourced compressors for stable sub-zero operation down to −70 °C
• Stainless steel inner chamber and powder-coated structural frame ensure long-term corrosion resistance and cleanroom-compatible surface finish
• Integrated water reservoir monitoring with predictive low-level warning and automatic shutdown safeguard to prevent dry-heater damage
• Pre-configured compliance modes aligned with common test standards (e.g., “IEC 60068-2-30 Cycle 1”, “GB/T 2423.3”) reduce setup errors and improve inter-laboratory reproducibility

Sample Compatibility & Compliance

The LTH chamber accommodates samples ranging from small PCB assemblies and polymer components to full-size automotive ECUs and medical device enclosures. Internal dimensions scale across five models (LTH-A to LTH-E), supporting volume capacities from 165 L to 1000 L. All variants meet electromagnetic compatibility (EMC) requirements per EN 61326-1 and safety standards per IEC 61010-1. The system supports GLP/GMP-aligned workflows through optional data logging modules with timestamped, tamper-evident records traceable to NIST-traceable references. When equipped with RS-485 and validated software, it satisfies FDA 21 CFR Part 11 requirements for electronic records and signatures—including audit trails, user authentication, and electronic signature capture.

Software & Data Management

Standard configuration includes embedded controller firmware with onboard data logging (≥30-day buffer at 1-min intervals). Optional PC-based software (LN2V Suite) enables remote monitoring, script-based test sequencing, automated report generation (PDF/CSV), and integration with LIMS via OPC UA or Modbus TCP. All logged data include metadata: operator ID, test plan version, chamber serial number, calibration due date, and environmental deviation flags. Exported datasets comply with ASTM E2911-22 for environmental test data formatting, facilitating third-party analysis and regulatory submission.

Applications

• Electronics: Thermal cycling of semiconductors, moisture sensitivity level (MSL) preconditioning per J-STD-020, conformal coating durability assessment
• Automotive: Validation of infotainment systems per ISO 16750-4, battery pack thermal management under humidified cold soak
• Pharmaceuticals: Stability chamber qualification per ICH Q1A(R2), excipient hygroscopicity mapping, packaging permeability screening
• Aerospace: Component qualification to MIL-STD-810G, composite curing cycle verification, avionics enclosure ingress protection (IPX4/IPX5) environmental prep
• Materials Science: Polymer crystallinity shift analysis via DSC-correlated thermal ramps, adhesive bond strength degradation under cyclic RH exposure

FAQ

What international standards does the LTH chamber support out-of-the-box?
It natively implements test profiles referenced in IEC 60068-2-1, -2-2, -2-14, -2-30; GB/T 2423.1, .2, .3, .4; JIS C 0021; and MIL-STD-810G Methods 502.5, 507.5. Custom profiles can be programmed via the controller’s slope-editing interface.
Is the chamber suitable for long-term stability testing per ICH guidelines?
Yes—when configured with continuous data logging, calibrated sensors (traceable to national metrology institutes), and periodic verification per ISO/IEC 17025, the LTH series meets ICH Q1A(R2) chamber qualification requirements for temperature uniformity (±2 °C) and humidity stability (±5 %RH) over 24 h.
Can the system operate continuously at −70 °C and 10 %RH simultaneously?
Yes—the dual-stage refrigeration system and regenerative desiccant option (LHC module) enable sustained operation at the extreme lower corner of the operating envelope without icing or sensor drift.
How is calibration traceability maintained?
Each unit ships with a factory calibration certificate referencing NIM (National Institute of Metrology, China) standards. Optional annual recalibration services include as-found/as-left reports, uncertainty budgets per GUM, and ISO/IEC 17025 accreditation documentation.
What safety protections are built into the controller firmware?
Over-temperature cut-off, heater dry-run detection, compressor high-pressure lockout, humidity sensor fault recognition, and emergency power-off via hardware relay—all independently monitored by redundant firmware layers.