YiHeng LHH-SG / LHH-SSG Multi-Chamber Drug Stability Testing Chambers

Overview

The YiHeng LHH-SG and LHH-SSG series are multi-chamber environmental simulation systems engineered specifically for pharmaceutical stability testing in compliance with ICH Q1–Q5 guidelines. These chambers integrate temperature, humidity, and photostability control within a single modular architecture—enabling concurrent execution of multiple ICH-defined test conditions (e.g., 25 °C/60% RH, 30 °C/65% RH, 40 °C/75% RH, and photostability per ICH Q5C). Unlike single-zone chambers, the LHH-SG/SSG series features independently controlled workspaces—each equipped with dedicated PID-regulated heating/cooling circuits, ultrasonic humidification, and UV-filtered daylight or cool white LED irradiation modules. This design eliminates cross-condition interference and supports parallel assessment of formulation robustness across storage scenarios, accelerating regulatory filing timelines without compromising data integrity.

Key Features

• Modular dual- or triple-chamber configuration: Each chamber operates autonomously with isolated air circulation, independent temperature/humidity setpoints, and programmable light exposure profiles.
• Stainless steel interior with seamless semi-circular corners (Ra ≤ 0.8 µm finish), compliant with ISO 14644-1 Class 8 cleanroom surface requirements for ease of cleaning and microbial control.
• Dual redundant hermetic compressors (imported, oil-free scroll type) with automatic load-balancing and failover switching—ensuring uninterrupted operation for ≥12 months under continuous ICH long-term testing protocols.
• Frost-free refrigeration cycle: Eliminates manual or timed defrost cycles, preventing transient humidity excursions (>±3% RH) and thermal overshoot during extended runs.
• Capacitive polymer humidity sensors (imported, ±1.5% RH accuracy at 25–85% RH range), calibrated traceably to NIST standards—replacing maintenance-intensive wet-bulb/dry-bulb assemblies.
• 7-inch capacitive touchscreen controller with real-time graphical trend display (temperature, RH, irradiance), event logging, and embedded curve analysis tools.
• Comprehensive safety architecture: Independent over-temperature cut-off (mechanical backup), door-interlocked fan/heater shutdown, variable-speed EC fans (0–100% PWM control), and password-protected parameter locking.

Sample Compatibility & Compliance

The LHH-SG/SSG accommodates standard ICH-compliant sample trays (up to 300 mm × 400 mm footprint per chamber), including glass vials, blister packs, sachets, and primary packaging formats. All chambers meet ISO 16770:2021 (stability testing equipment qualification) and support full 3Q validation (IQ/OQ/PQ) documentation packages—including sensor calibration certificates (traceable to national metrology institutes), mapping reports (per ASTM E2297), and alarm response verification logs. The system architecture is designed for GLP/GMP environments: audit trail functionality records all user actions (login/logout, setpoint changes, alarm acknowledgments) with timestamps and operator IDs; electronic signatures comply with FDA 21 CFR Part 11 requirements when paired with validated authentication protocols.

Software & Data Management

The embedded controller runs YiHeng’s proprietary STC-OS firmware (v4.2+), supporting multi-level access control (Administrator, Operator, Guest) with role-based permissions. User accounts support bilingual (English/Chinese) login via alphanumeric or pinyin input, and all sessions generate immutable operation logs stored locally on encrypted SD card (≥12-month retention). Optional Ethernet/Wi-Fi connectivity enables remote monitoring via web browser or secure HTTPS API integration with LIMS or MES platforms. Data export formats include CSV (time-stamped sensor readings), PDF (summary reports with pass/fail status against ICH thresholds), and XML (for automated regulatory submission workflows).

Applications

• ICH Q1A(R2) long-term, accelerated, and intermediate condition testing
• ICH Q5C photostability studies (Option A: UV/visible light exposure per Q5C Annex 1)
• Excipient compatibility screening under varying hygroscopic stress
• Package integrity evaluation (e.g., moisture vapor transmission rate correlation)
• Stability-indicating method development support (e.g., forced degradation condition replication)
• Regulatory submission dossier preparation (aligned with WHO TRS 1010, USP , and EP 2.2.45)

FAQ

Does the system support 21 CFR Part 11 compliance?
Yes—when configured with audit-trail-enabled firmware, electronic signature modules, and validated user authentication, the LHH-SG/SSG meets core technical requirements for Part 11 compliance, including record retention, identity verification, and change control.
Can chambers operate at different temperature/humidity setpoints simultaneously?
Yes—each chamber has independent climate control hardware and software logic, enabling concurrent execution of distinct ICH conditions without thermal or humidity crosstalk.
Is third-party IQ/OQ/PQ support available?
YiHeng provides optional factory-authorized 3Q validation services, including protocol development, execution, and final report generation aligned with ASTM E2500 and EU Annex 15.
What is the recalibration interval for integrated sensors?
Humidity sensors are rated for 12 months of stable performance; temperature probes require annual verification per ISO/IEC 17025-accredited procedures—both supported by YiHeng’s calibration certificate service.
How is lighting intensity monitored and maintained?
LED irradiance modules include built-in photodiode feedback loops with real-time lux and UV-A (320–400 nm) output tracking; intensity drift compensation occurs automatically every 24 hours.