DRETOP MH-250 Pharmaceutical Stability Testing Chamber
| Brand | DRETOP |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Model | MH-250 |
| Voltage | AC 220 V / 50 Hz |
| Temperature Range | 0–65 °C |
| Temperature Uniformity | ±2.5 °C |
| Temperature Fluctuation | ±0.5 °C |
| Humidity Range | 30–95 %RH (customizable to 20–95 %RH) |
| Humidity Deviation | ±3 %RH |
| Illumination | Optional LED-based light source (Lx display, adjustable intensity) |
| Internal Volume | 250 L |
| Inner Chamber Dimensions (W×D×H) | 580 × 500 × 850 mm |
| Shelf Quantity | 3 adjustable stainless-steel shelves |
| Power Consumption | 2400 W |
| Control System | 7-inch color touchscreen with multi-level user permissions |
| Data Logging | 60-second interval, >3 years continuous storage |
| Compliance Support | IQ/OQ/PQ documentation available |
Overview
The DRETOP MH-250 Pharmaceutical Stability Testing Chamber is an ICH-compliant environmental simulation system engineered for precise, long-term assessment of drug product stability under controlled temperature, humidity, and optional illumination conditions. Designed in accordance with ICH Q1A(R2), Q1B, Q5C, and relevant ISO 14644-1 cleanroom-class air handling principles, the chamber replicates accelerated, intermediate, and long-term storage environments required for regulatory submission packages. Its core architecture integrates independent PID-controlled refrigeration, humidification, and heating subsystems—each isolated to prevent cross-interference and ensure metrological traceability. The unit employs a high-efficiency hermetic compressor (R134a-free, low-GWP refrigerant), nickel-chromium alloy heating elements, and centrifugal forced-air circulation optimized to meet ICH-defined uniformity criteria (±2.5 °C spatial deviation, ±0.5 °C temporal fluctuation). All critical components—including electronic humidity sensors rated for continuous operation at elevated temperatures—are selected for zero-drift performance over extended test durations (≥180 days uninterrupted).
Key Features
- 7-inch industrial-grade color touchscreen interface supporting dual-language (English/Chinese) operation and hierarchical access control: Administrator (full configuration), Maintenance Technician (real-time monitoring + log review), and Operator (start/stop + data view only).
- Programmable logic controller capable of storing up to 100 multi-segment protocols (100 segments per program), enabling complex ICH-aligned sequences—e.g., 40 °C/75 %RH for 6 months followed by 25 °C/60 %RH for 12 months—with slope-based ramping for temperature and humidity transitions.
- Independent thermal and humidification control loops eliminate coupling effects; high-temperature-rated capacitive humidity sensors eliminate wet-bulb maintenance while maintaining ±3 %RH accuracy across full operational range (30–95 %RH).
- Optimized air distribution system featuring asymmetric vane diffusers and laminar-flow duct geometry ensures rapid door-recovery (<5 min to re-stabilize after 30-sec opening) and superior spatial uniformity (validated per ASTM E2875-22 Annex A2).
- Robust safety architecture includes dual redundant over-temperature cutoffs (primary PID + independent K-type mechanical limiter), compressor/fan overload protection, earth-leakage circuit interruption, and automatic power recovery after grid outage.
- Integrated data integrity framework compliant with FDA 21 CFR Part 11: audit-trail-enabled event logging (system operations, alarms, parameter changes), time-stamped electronic signatures, and non-erasable history storage (3+ years at 60-sec resolution).
Sample Compatibility & Compliance
The MH-250 accommodates standard pharmaceutical packaging formats—including blister packs, HDPE bottles, glass vials, and aluminum-laminated pouches—on three corrosion-resistant, height-adjustable stainless-steel shelves (load capacity: 15 kg/shelf). Its sealed inner chamber (silicone gasket rated for −20 to +80 °C service life) maintains positive pressure differential to prevent external particulate ingress. Optional UV-C sterilization (V-type) and multi-spectrum LED irradiation (R/G/B/V combinations) support photostability testing per ICH Q1B. Full 3Q validation documentation (IQ/OQ/PQ) is provided upon request, aligned with EU GMP Annex 15 and USP . CNAS-accredited calibration certificates are available for user-defined reference points—traceable to NIM (National Institute of Metrology, China) standards.
Software & Data Management
Embedded firmware supports native USB export (CSV), RS485 Modbus RTU communication for SCADA integration, and optional Wi-Fi-enabled remote monitoring via secure web portal. Real-time trend visualization includes overlay-capable multi-parameter graphs (T/RH/Lx), configurable alarm thresholds (email/SMS push via B-type module), and automated report generation (PDF/Excel) compliant with ALCOA+ principles. Historical datasets retain full contextual metadata: operator ID, program version, environmental deviations, and maintenance timestamps—enabling full forensic reconstruction during regulatory audits. Optional J-type paperless recorder provides local 7-inch LCD display with 16 GB internal flash memory.
Applications
- ICH Q1A(R2) long-term (25 °C/60 %RH), intermediate (30 °C/65 %RH), and accelerated (40 °C/75 %RH) stability studies for APIs and finished dosage forms.
- ICH Q1B photostability assessment under near-UV (320–400 nm) and visible (400–800 nm) irradiation using calibrated LED arrays.
- GMP-compliant shelf-life determination for biologics, sterile injectables, and lyophilized products requiring strict moisture control.
- Excipient compatibility screening under high-humidity stress (up to 95 %RH) and thermal cycling protocols.
- Method validation support for dissolution, HPLC, and microbiological assays requiring stable ambient conditioning of reference standards.
FAQ
Does the MH-250 comply with FDA 21 CFR Part 11 requirements for electronic records?
Yes—the system implements role-based electronic signatures, immutable audit trails, and automated backup of all operational logs and sensor data, satisfying Part 11 Subpart B technical controls.
Can humidity be maintained at 20 %RH for desiccated stability testing?
Standard configuration supports 30–95 %RH; 20–95 %RH is available as a factory-customized option with enhanced dehumidification hardware.
Is third-party IQ/OQ/PQ support included or optional?
Pre-validated 3Q documentation packages are optional add-ons; on-site qualification assistance by certified engineers is available globally.
What is the maximum allowable sample load without compromising temperature uniformity?
Uniformity validation was performed at 80 % chamber volume loading (200 L of inert mass); actual payload must not exceed 15 kg per shelf to maintain specified ±2.5 °C spatial tolerance.
How frequently does the system require preventive maintenance?
Compressor oil and refrigerant integrity checks are recommended annually; humidity sensor recalibration every 12 months; no routine wet-bulb replacement required due to solid-state sensing architecture.
