ALISN THA 460 Temperature and Humidity Controlled Environmental Test Chamber

Overview

The ALISN THA 460 is a precision-engineered upright temperature and humidity controlled environmental test chamber designed for long-term stability, traceable operation, and regulatory compliance in quality-critical environments. It operates on the principle of closed-loop thermodynamic control—using variable-speed compressor modulation, high-efficiency air-cooled condensation, and capacitive humidity sensing—to maintain defined climatic conditions within specified tolerances across its 464 L working volume. Engineered for pharmaceutical stability testing (ICH Q1–Q5), accelerated aging studies (ASTM D3045, ISO 11727), food shelf-life validation, polymer conditioning (ISO 291), and materials qualification under IEC 60068-2-1/2/30, the THA 460 meets foundational requirements for GLP and GMP-aligned laboratories where environmental reproducibility directly impacts data integrity and product release decisions.

Key Features

• Advanced dual-sensor climate control: German-made Heraeus platinum resistance thermometers (Pt100) and E+E Elektronik capacitive RH sensors ensure long-term drift stability and minimal hysteresis—no periodic recalibration required.
• Energy-optimized refrigeration architecture: Secop (Danfoss Group) variable-frequency scroll compressor paired with EBM radial condenser fans enables frost-free continuous operation, reducing power consumption by >40% versus conventional fixed-speed systems (measured at 25 °C ambient, 65%RH).
• Immutable data governance: Onboard non-volatile memory stores ≥10 years of time-stamped temperature/humidity readings at user-defined intervals; raw logs are exportable only via physically write-protected USB drive—no network upload or remote modification permitted.
• Fully auditable operational history: 16,000-entry audit trail captures timestamped operator actions, parameter changes, alarm events (e.g., door open, sensor fault, overtemp), and system resets—all retained locally and exportable in CSV format for FDA 21 CFR Part 11 compliance.
• Multi-tier access control: Administrator-configurable user roles (e.g., Operator, Technician, QA Reviewer) enforce segregation of duties; password-protected parameter editing prevents unauthorized deviation from validated protocols.
• Thermal integrity design: 120 mm monolithic polyurethane foam insulation (λ ≤ 0.022 W/m·K) minimizes thermal bridging; double-glazed tempered inner door with silicone-sealed port (Ø50 mm) supports probe feedthrough without compromising chamber uniformity.

Sample Compatibility & Compliance

The THA 460 accommodates standard ISO/IEC 17025-compliant sample racks (three stainless-steel shelves included), with load capacity verified under ASTM E2889–22 guidelines for airflow obstruction. Its temperature uniformity (±0.8 °C across workspace at 40 °C/75%RH) and humidity stability (±1.5%RH) satisfy ICH Q5C recommendations for biopharmaceutical storage condition mapping. The chamber’s construction complies with IEC 61000-6-2/6-4 EMC standards and includes integrated safety interlocks: compressor high-pressure cutoff, solid-state overtemperature cutoff (independent of main controller), low-water-level detection for humidifier, and real-time door-open monitoring with audible/visual alert. All firmware and calibration records adhere to ALAC (Analytical Laboratory Accreditation Criteria) documentation hierarchy.

Software & Data Management

No external software installation is required—the THA 460 embeds a deterministic real-time OS with deterministic PID/fuzzy hybrid control logic. The 7-inch capacitive touchscreen provides intuitive navigation through contextual menus, real-time trend graphs (dual-axis, zoomable), and historical data playback (min/max/avg per 15-min interval). Logged data conforms to ISO/IEC 17025 clause 7.5.2: all timestamps include UTC offset and are synchronized via internal RTC (accuracy ±2 s/month). Exported .CSV files contain SHA-256 hash headers to verify data authenticity post-transfer. Optional RS-485 Modbus RTU integration allows centralized chamber fleet monitoring via SCADA or LIMS platforms without compromising local auditability.

Applications

• Pharmaceutical stability studies per ICH Q1A(R3), including long-term (25 °C/60%RH), accelerated (40 °C/75%RH), and intermediate condition testing.
• Electronics reliability screening (JEDEC JESD22-A110) for moisture sensitivity level (MSL) classification and preconditioning prior to reflow.
• Polymer hygrothermal aging per ISO 11727 and ASTM D570 to quantify dimensional change, tensile loss, or hydrolytic degradation kinetics.
• Food packaging permeability assessment (ASTM F1249) requiring precise RH ramping and plateau maintenance during WVTR measurement.
• Biological reference material storage validation (CLSI GP35-A3), ensuring matrix stability across defined humidity gradients.
• Calibration lab environmental monitoring for weighing rooms, titration suites, and reference standard storage per USP .

FAQ

Does the THA 460 support custom temperature/humidity ramp-and-soak profiles?
Yes—up to 255 segments with independent rate control (0.1–10 °C/min, 0.1–10%RH/min), dwell time (1 min–999 h), and loop count (1–999 cycles). Profiles are stored internally and password-locked.
Is the humidity sensor certified to NIST-traceable standards?
The E+E E21 series capacitive sensor is factory-calibrated against NIST-traceable dew point standards (±0.8%RH uncertainty at 23 °C); calibration certificate is supplied with each unit.
Can the chamber operate continuously for 180 days without maintenance?
Yes—verified per ISO 16750-4: the Secop compressor and EBM fan exhibit MTBF >50,000 hours under nominal load; humidifier tank requires manual refill every 72–120 hours depending on setpoint and ambient conditions.
What validation documentation is provided?
Factory-issued IQ/OQ protocol templates (GAMP 5-aligned), as-built drawings, sensor calibration reports, and a full FAT report—including temperature/humidity uniformity maps generated per ISO 14644-3 Annex B—are included digitally and on USB.
Is remote monitoring possible without compromising 21 CFR Part 11 compliance?
RS-485 Modbus output permits read-only status polling (current values, alarms, runtime hours); no remote parameter adjustment or log deletion is permitted—ensuring electronic record integrity per Part 11 §11.10(d).