WEISS WK Series Walk-in Temperature and Humidity Controlled Chamber
| Brand | WEISS |
|---|---|
| Origin | Germany |
| Model | WK |
| Chamber Volume Options | 4–41 m³ |
| Temperature Range | +20 °C to +45 °C |
| Temperature Uniformity | ≤ ±1 °C |
| Humidity Range | 20–80 % RH |
| Humidity Stability (over time) | ≤ ±3 % RH |
| Insulation | CFC-free polyurethane (PU) |
| Control System | Microprocessor-based, compliant with GAMP 5 and FDA 21 CFR Part 11 |
| Humidification | Ultrasonic |
| Dehumidification | Refrigerant-based |
| Heating | Electric |
| Cooling | Air-cooled refrigeration |
| Safety Features | Dual independent temperature safety cut-offs, sample temperature monitoring, emergency door release |
Overview
The WEISS WK Series Walk-in Temperature and Humidity Controlled Chamber is an engineered environmental simulation system designed for long-term stability testing, accelerated aging studies, and controlled-condition storage in regulated pharmaceutical, biotechnology, and materials science laboratories. Based on the fundamental principles of psychrometric control and forced-air convection, the chamber maintains precise, uniform, and traceable climatic conditions across large internal volumes—ranging from 4 m³ to 41 m³—enabling simultaneous conditioning of multiple batches, full-scale equipment, or palletized samples. Its architecture adheres to ICH Q1A(R2), Q5C, and Q7 guidance, as well as EU Annex 15 and USP , making it suitable for qualification under GMP environments where data integrity, audit readiness, and process reproducibility are mandatory.
Key Features
- CFC-free polyurethane (PU) insulation with high thermal resistance (R-value > 4.5 m²·K/W), ensuring energy-efficient operation and eliminating ozone-depleting substances.
- Dual-layer metallized door seal with mechanical emergency release mechanism—compliant with EN 61000-6-4 and ISO 13857 for operator safety.
- Ultrasonic humidification system delivering rapid, particle-free moisture generation with no mineral residue or microbiological risk—critical for sterile and low-bioburden applications.
- Refrigerant-based dehumidification integrated with air-cooled condensing units, enabling stable RH control down to 20 % RH without desiccant replacement or regeneration cycles.
- Microprocessor controller with dual-channel PID algorithms for independent temperature and humidity regulation; supports real-time trend logging, alarm history, and configurable setpoint ramps.
- Pre-installed validation-ready hardware: NIST-traceable Pt100 temperature sensors and capacitive RH sensors with factory calibration certificates; all sensors require no field recalibration during routine operation.
- Redundant safety architecture including two independent overtemperature cut-offs (one electronic, one mechanical), sample temperature monitoring port, and door-open detection with automatic power-down sequence.
Sample Compatibility & Compliance
The WK chamber accommodates diverse sample configurations—from stacked cartons and stability chambers to fully assembled medical devices and active pharmaceutical ingredients (APIs) in primary packaging. Internal dimensions are customizable to integrate shelving, cable ports, and material handling interfaces. All models are supplied with IQ/OQ documentation templates aligned with ASTM E2500-13 and ISPE Baseline Guide Vol. 5. The control system meets FDA 21 CFR Part 11 requirements for electronic records and signatures, featuring role-based access control, audit trail with immutable timestamps, and electronic signature workflows for SOP execution and deviation management. Full compliance with GAMP 5 Category 4 software classification is verified through vendor-supplied validation packages.
Software & Data Management
The embedded controller supports local HMI operation via a 7-inch capacitive touchscreen with multilingual UI (English, German, French, Spanish). Optional Ethernet/IP and Modbus TCP connectivity enables integration into centralized SCADA or MES platforms. Data export is available in CSV and PDF formats with configurable intervals (1 sec to 24 h); raw sensor values, setpoints, alarms, and user actions are archived in encrypted binary logs. Optional cloud-enabled remote monitoring (via TLS 1.2–secured MQTT) provides real-time alerts and historical dashboards accessible via browser or mobile app—fully compatible with ISO/IEC 27001-aligned IT infrastructure policies.
Applications
- ICH-compliant long-term and accelerated stability studies for drug substances and products (Q1A–Q1E).
- Storage condition verification per USP and Ph. Eur. 2.1.7 for reference standards and retained samples.
- Environmental stress screening of electronic assemblies prior to HALT/HASS testing.
- Material compatibility testing of packaging components under cyclic humidity exposure.
- Biological sample incubation for cell culture media stability and excipient interaction studies.
- Validation of cold chain logistics equipment and warehouse mapping per WHO Technical Report Series No. 961.
FAQ
Does the WK chamber support 21 CFR Part 11 compliance out-of-the-box?
Yes—the system ships with pre-validated firmware, electronic signature capability, and a complete audit trail function enabled by default. A vendor-supplied Part 11 compliance package includes risk assessment, configuration specification, and test protocols.
Can the chamber operate continuously at 45 °C and 80 % RH?
Yes—continuous operation across the full specified range (+20 to +45 °C / 20–80 % RH) is validated per IEC 60068-3-5 and supported by thermal load calculations included in the site preparation guide.
Is third-party calibration required after installation?
No—factory-calibrated sensors are provided with NIST-traceable certificates. On-site verification using accredited portable standards is recommended annually per ISO/IEC 17025, but recalibration is not necessary unless physical damage occurs.
What is the typical lead time for custom volume configurations?
Standard WK models (4, 10, 15, 25, 32, 41 m³) ship within 12 weeks from order confirmation. Custom geometries or interface modifications extend lead time to 16–20 weeks, subject to engineering review.
