YiHeng BPHJS Series High-Low Temperature Alternating Humidity Environmental Test Chamber

Overview

The YiHeng BPHJS Series High-Low Temperature Alternating Humidity Environmental Test Chamber is an engineered solution for accelerated environmental stress testing under precisely controlled thermal and hygrothermal conditions. Designed in accordance with IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), IEC 60068-2-30 (damp heat, cyclic), and ISO 16750-4 (road vehicles — environmental conditions), this chamber enables rigorous evaluation of material stability, component reliability, and product integrity across dynamic temperature-humidity profiles. Its dual-zone refrigeration architecture—featuring imported hermetic compressors and R134a refrigerant—ensures stable operation across extended low-temperature ranges (down to −60 °C) while maintaining strict humidity control between 30 %RH and 95 %RH. The chamber employs a forced-air convection system with optimized air distribution ducts and rear-mounted centrifugal fans to achieve ≤±2 °C temperature uniformity and ≤±3 %RH humidity uniformity throughout the working volume—critical parameters for compliance with ASTM D4332, MIL-STD-810H Method 507.5, and JEDEC JESD22-A101.

Key Features

• Full-color 7-inch TFT capacitive touchscreen controller with intuitive menu-driven interface supporting both English and Chinese language selection.
• Advanced programmable logic: up to 120 user-defined test programs, each containing up to 99 segments; maximum cycle count: 999; segment duration resolution: 1 second (up to 999 h 59 min 59 s).
• PID auto-tuning algorithm dynamically adjusts heating/cooling output and humidification/dehumidification response to minimize overshoot and stabilize setpoints rapidly.
• AISI 304 mirror-finish stainless steel inner chamber with radius-rounded corners and removable adjustable shelves—designed for corrosion resistance, ease of cleaning, and long-term dimensional stability.
• Integrated water reservoir with front-access pull-out drawer and level sensor—eliminates need for external water supply during standard operation.
• Dual independent safety systems: primary microprocessor-based controller plus a hardware-level over-temperature cut-off relay with visual/audible alarm.
• Left-side test port options: Ø25 mm or Ø50 mm (with silicone plug and clamping collar) for real-time sensor feedthrough or cable routing without compromising chamber integrity.

Sample Compatibility & Compliance

The BPHJS series accommodates a broad spectrum of test specimens—including printed circuit boards (PCBs), automotive ECUs, polymer enclosures, medical device housings, aerospace fasteners, and battery modules—within working volumes ranging from 60 L to 1000 L. All models comply with GLP-relevant design principles: traceable calibration paths, non-volatile parameter storage, and audit-ready operational logs. Optional configuration supports 21 CFR Part 11-compliant electronic signatures and audit trails when paired with validated PC-based control software. Chamber construction meets IP20 enclosure rating per IEC 60529, and electrical safety conforms to IEC 61010-1. Humidity generation uses resistive steam humidification; dehumidification relies on cold-finger condensation assisted by hot-gas bypass modulation—ensuring repeatable RH transitions without water carryover or droplet formation.

Software & Data Management

The integrated controller stores full-cycle runtime data—including actual vs. setpoint temperature/humidity, alarm events, and system status flags—in non-volatile memory. Via RS-232 or RS-485 interface, up to 30 chambers can be centrally monitored and controlled using YiHeng’s proprietary LabControl Suite (Windows-based). This software provides real-time multi-channel graphing, automated report generation (exportable as .xlsx, .docx, or PDF), and configurable email/SNMP alerts for critical deviations. USB-SD card interface enables offline data extraction for regulatory submission or third-party analysis. All exported datasets include UTC timestamps, operator ID fields, and instrument identification metadata—supporting ISO/IEC 17025 documentation requirements for accredited laboratories.

Applications

• Accelerated aging studies of elastomers, adhesives, and conformal coatings under thermal cycling with humidity bias.
• Qualification testing of electronic assemblies per IPC-9701 and AEC-Q200 standards.
• Validation of packaging barrier performance (e.g., blister packs, pouches) under combined thermal-hygric stress.
• Environmental stress screening (ESS) of avionics components prior to HALT/HASS protocols.
• Stability testing of pharmaceutical intermediates and excipients under ICH Q1A(R2) recommended conditions.
• Corrosion susceptibility assessment of metallic substrates per ASTM B117 (salt fog) when integrated with auxiliary salt spray modules.

FAQ

What temperature and humidity ranges are supported across BPHJS models?
Standard configurations support −20 °C to +130 °C (Type A), −40 °C to +130 °C (Type B), and −60 °C to +130 °C (Type C), with concurrent humidity control from 30 %RH to 95 %RH.
Is the chamber suitable for GMP-regulated environments?
Yes—when equipped with optional validation packages (IQ/OQ/PQ documentation templates, calibration certificates traceable to NIST), it supports FDA and EMA inspection readiness for pharmaceutical and medical device applications.
Can the controller log data without external PC connection?
Yes—the internal controller records all process variables at user-configurable intervals (1–600 seconds) and retains ≥30 days of continuous data in flash memory.
What refrigerant is used, and does it meet current environmental regulations?
R134a is employed—a zero-ozone-depletion-potential (ODP = 0) hydrofluorocarbon compliant with EU F-Gas Regulation (EC) No 517/2014 and EPA SNAP program requirements.
How is temperature uniformity verified and maintained?
Uniformity is ensured via calibrated axial and radial airflow mapping during factory acceptance testing; maintenance relies on periodic verification using NIST-traceable multi-point thermohygrometers per ASTM E744.