YiHeng BPHS Series High-Low Temperature & Humidity Environmental Test Chamber

Overview

The YiHeng BPHS Series High-Low Temperature & Humidity Environmental Test Chamber is an engineered environmental simulation system designed for precise, repeatable, and compliant thermal and hygrothermal stress testing of materials, components, and finished products. It operates on the principle of forced-air convection combined with integrated refrigeration, heating, and humidification subsystems to replicate real-world climatic conditions across extended operational cycles. The chamber meets fundamental requirements for accelerated aging, reliability validation, and environmental qualification per international standards including IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-30 (damp heat cyclic), and MIL-STD-810G Method 502.5. Its architecture supports both steady-state and programmable dynamic profiles—enabling laboratories to conduct temperature-only, humidity-only, or combined temperature-humidity test sequences under controlled, auditable conditions.

Key Features

• Triple-tier temperature range configuration: Standard (−20 °C to 150 °C), Extended Low-Temp (−40 °C to 150 °C), and Ultra-Low-Temp (−60 °C to 150 °C) variants—each calibrated to maintain ±0.5 °C temperature fluctuation and ±2 °C spatial uniformity across the working volume.
• Environmentally compliant refrigeration using R134a—a zero-ozone-depletion-potential (ODP) refrigerant—paired with high-efficiency imported compressors and axial-flow circulation fans for stable thermal distribution and reduced energy consumption.
• Programmable control system featuring a 20-character × 6-line backlit LCD interface with fuzzy logic PID algorithms; optional upgrade to full-color capacitive touchscreen (BPHJS variant) supporting bilingual (English/Chinese) operation, real-time curve visualization, and password-protected screen lock.
• Robust internal construction: 304 mirror-finish stainless steel chamber liner with radius-corner transitions, removable adjustable shelving, and front-accessible pull-out water reservoir for simplified maintenance and contamination control.
• Dual-sensor humidity control: configurable dry-wet bulb or capacitive relative humidity sensing with ±3% RH accuracy across 20–98% RH range; integrated anti-condensation heating for sensor stability during low-temperature ramping.
• Comprehensive safety architecture: independent mechanical over-temperature cutoff, multi-stage thermal fault detection (compressor overheat, fan failure, phase loss), low-water-level interlock, and audible/visual alarm activation with event logging.

Sample Compatibility & Compliance

The BPHS chamber accommodates a broad spectrum of test specimens—from printed circuit boards (PCBs) and automotive electronic modules to polymer packaging, aerospace composites, and pharmaceutical primary containers. Its standard 25 mm or optional 50 mm left-side port enables external probe insertion without compromising chamber integrity. Internal dimensions are scalable across models to support ISO 17025-accredited calibration traceability and GLP-compliant test documentation. All units are manufactured in accordance with GB/T 10586 (Chinese national standard for environmental test chambers) and align with functional equivalency to ASTM E145, ISO 16750-4, and JEDEC JESD22-A104 for temperature cycling. Optional data acquisition modules support 21 CFR Part 11-compliant audit trails when paired with validated software environments.

Software & Data Management

• Standard USB (SD card) interface enables offline storage of time-stamped temperature/humidity logs in CSV format for post-processing in Excel or MATLAB.
• Optional RS-232/RS-485 serial communication allows integration into centralized lab management systems; up to 30 chambers can be monitored and controlled simultaneously via YiHeng’s proprietary PC-based control suite.
• Software features include graphical profile editor, real-time multi-chamber dashboard, automatic report generation (PDF/Word), and configurable alarm thresholds with email/SMS notification (via gateway add-on).
• Data export supports ISO/IEC 17025-required metadata tagging—including operator ID, calibration certificate numbers, ambient lab conditions, and instrument firmware version—for full traceability in quality audits.

Applications

This chamber serves critical roles in product development, quality assurance, and regulatory submission workflows. Typical use cases include: thermal shock pre-screening of semiconductor packages prior to HAST testing; humidity-induced corrosion evaluation of metallic contacts; long-term stability assessment of lithium-ion battery cells at elevated temperatures; shelf-life prediction of moisture-sensitive medical device packaging; and validation of HVAC component performance under extreme ambient conditions. In academic research, it supports studies on polymer glass transition behavior, hygroscopic swelling kinetics, and freeze-thaw degradation mechanisms in biomaterials.

FAQ

What is the standard calibration interval recommended for this chamber?
YiHeng recommends annual calibration against NIST-traceable reference sensors; field verification using portable thermohygrometers is advised before each critical test sequence.
Can the chamber operate continuously at −60 °C with 95% RH?
No—simultaneous ultra-low temperature and high humidity operation is physically constrained by dew point limitations; maximum achievable RH at −60 °C is <5% due to condensation risk and refrigeration system design boundaries.
Is remote monitoring supported without purchasing the optional PC software?
Basic status readout (current setpoint, actual value, alarm state) is available via Modbus RTU over RS-485 using third-party SCADA platforms; full profiling and historical analysis require YiHeng’s licensed application.
Does the unit comply with CE marking requirements for export to the EU?
Yes—units shipped for EU markets carry CE marking per Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU, accompanied by Declaration of Conformity and technical file documentation.
What maintenance tasks are required quarterly?
Visual inspection of condensate drain lines, cleaning of air intake filters, verification of door gasket compression, and verification of water reservoir cleanliness and level sensor responsiveness.