YiHeng LHH-SD/GSD Comprehensive Drug Stability Testing Chamber
| Brand | YiHeng |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | LHH-SD/GSD |
| Price Range | USD 2,800 – 7,000 |
Overview
The YiHeng LHH-SD/GSD Comprehensive Drug Stability Testing Chamber is an ISO 14644-compliant, GMP-aligned environmental simulation system engineered for long-term, uninterrupted pharmaceutical stability testing in accordance with ICH Q1A(R3), Q1B, Q5C, and USP . It integrates precise temperature, humidity, and optional photometric control within a single chamber to replicate the accelerated, intermediate, long-term, high-humidity, and photostability test conditions required by regulatory submissions. Built upon a dual-compressor architecture with automatic redundancy switching, the chamber eliminates thermal and hygric drift during continuous operation—addressing a critical limitation observed in legacy domestic stability chambers. Its design conforms to Good Laboratory Practice (GLP) and supports full audit trails when integrated with compliant data acquisition systems.
Key Features
- Dual independent imported compressors with intelligent auto-switching logic ensure uninterrupted operation for ≥180 days without manual defrost cycles—eliminating humidity/temperature transients caused by defrost events.
- Microprocessor-based programmable controller with PID algorithm delivers ±0.3 °C temperature uniformity (at 25 °C) and ±2.5% RH stability (at 60% RH), validated per ASTM E2875–21.
- 304 stainless steel interior with radius-corner construction and seamless welds enables ISO Class 7 cleanroom-compatible cleaning protocols and residue-free decontamination.
- Unidirectional air distribution via optimized wind tunnel ductwork ensures ≤±1.0 °C spatial uniformity across the entire working volume (per ICH Q1A Annex 2).
- High-temperature-capable capacitive humidity sensor (operable up to 85 °C/95% RH) eliminates dry-wet bulb maintenance and calibration drift associated with traditional psychrometric systems.
- Optional UV-C germicidal irradiation system (254 nm) mounted on rear wall provides periodic air and water reservoir sterilization—reducing bioburden risk during extended stability studies.
- Optional photometric module with calibrated silicon photodiode sensor and dimmable LED array enables real-time lux monitoring and closed-loop light intensity control (0–10,000 lux), compensating for lamp aging per ICH Q1B Step 3 requirements.
Sample Compatibility & Compliance
The LHH-SD/GSD accommodates standard pharmaceutical packaging formats—including blister packs, HDPE bottles, glass vials, and aluminum pouches—within its 25 mm diameter access port (left-side, sealed with silicone gasket). Internal dimensions support stacked trays up to 450 × 450 × 500 mm (W × D × H). The chamber meets EN 61000-6-3 (EMC) and EN 61000-6-2 immunity standards. All firmware and controller logic are designed to support 21 CFR Part 11-compliant electronic records when paired with validated third-party data logging software. Temperature and humidity sensors are NIST-traceable and factory-calibrated; calibration certificates are supplied with each unit.
Software & Data Management
The 7-inch resistive touchscreen controller features bilingual (English/Chinese) UI, real-time trend graphs, and embedded event logging (≥10,000 entries). It stores up to 100 user-defined programs (1000 segments, 999 cycles), with segment duration configurable from 1 minute to 99 hours 59 minutes. RS-232/RS-485 interfaces enable connection to external PCs running validated data acquisition platforms (e.g., LabVIEW, DeltaV, or custom Python-based audit-trail systems). Optional thermal printer output provides hard-copy traceability of setpoints, deviations, alarms, and maintenance logs—essential for FDA pre-approval inspections. Password-protected screen lock and role-based access control prevent unauthorized parameter modification.
Applications
- ICH Q1A(R3)-compliant accelerated stability studies (40 °C/75% RH, 30 °C/65% RH)
- Long-term storage condition testing (25 °C/60% RH, 30 °C/65% RH, or 5 °C refrigerated variants)
- Intermediate condition assessment per Q1A guidance
- ICH Q1B photostability testing (Option A: cool white fluorescent + near-UV; Option B: simulated daylight)
- High-humidity stress testing (90% RH at 25 °C or 40 °C)
- Excipient compatibility screening under controlled hygrothermal stress
- Reference standard storage validation per USP
FAQ
Does the chamber support 21 CFR Part 11 compliance?
Yes—when used with validated third-party software that implements electronic signatures, audit trails, and role-based permissions.
What is the maximum continuous runtime without maintenance?
Rated for ≥6 months of unattended operation under nominal load (25 °C/60% RH), verified via internal compressor duty-cycle logging.
Can humidity be maintained at 90% RH above 40 °C?
No—maximum sustainable humidity at 40 °C is 75% RH due to saturation limits; operation at 90% RH is only supported at ≤25 °C per ICH Q1A.
Is the UV-C system validated for microbial reduction?
The 254 nm lamp achieves ≥3-log reduction of Bacillus atrophaeus spores in air stream after 30 min exposure (data available upon request).
How is temperature uniformity verified?
Performed using 9-point thermocouple mapping per ASTM E2875–21, with report included in factory acceptance test documentation.
