Shanghai Youyi LHS-1000CL Temperature and Humidity Controlled Environmental Test Chamber

Overview

The Shanghai Youyi LHS-1000CL is a high-capacity upright environmental test chamber engineered for precise, long-term temperature and humidity control across demanding scientific and industrial applications. Designed according to ISO 17025-aligned environmental conditioning principles, it employs a dual-loop microprocessor-based PID control architecture to independently regulate refrigeration, heating, and humidification subsystems. Its core function is to replicate and maintain stable climatic conditions—specifically from −40 °C to +80 °C and 30–95 %RH—within a 1000 L working volume. The chamber’s air-cooled refrigeration system utilizes environmentally compliant R134a/R406a refrigerants, meeting international ozone depletion potential (ODP) and global warming potential (GWP) standards. Structural design emphasizes thermal integrity: double-glazed, gas-sealed observation doors minimize heat leakage; a mirror-finish stainless steel interior (AISI 304) ensures corrosion resistance and facilitates GLP-compliant cleaning validation; and optimized airflow distribution—via rear-mounted centrifugal fans and multi-directional wind ducts—guarantees ≤±0.5 °C temperature uniformity and ≤±3 %RH humidity uniformity (measured at 9 reference points per IEC 60068-3-5).

Key Features

• 1000 L usable volume with internal dimensions of 1000 × 1000 × 1000 mm—optimized for large-scale sample batches, stacked storage racks, or full-size equipment qualification.
• Advanced 5.7-inch color LCD controller supporting up to 99 programmable cycles, each comprising 30 individually configurable segments (max. 99 h 99 min per segment), enabling complex stress profiles aligned with MIL-STD-810H or JEDEC JESD22-A110 test sequences.
• Integrated humidity generation via electric heating rods immersed in an auto-refillable water reservoir—eliminates external water supply dependency while maintaining stable vapor pressure output under dynamic load conditions.
• Capacitive humidity sensor from a globally certified OEM supplier (traceable calibration certificate available), delivering long-term drift stability <±0.8 %RH/year and fast response time (<30 s to 90 % step change).
• Modular mechanical design: four swivel casters with locking brakes and adjustable leveling feet ensure safe relocation and vibration-isolated placement on standard laboratory flooring.
• Comprehensive safety architecture includes over-temperature cut-off, compressor high-pressure protection, door-open alarm, and optional independent over-temperature limiter (available as add-on).

Sample Compatibility & Compliance

The LHS-1000CL accommodates diverse sample types—including biological specimens (frozen plasma, cryopreserved cell lines), pharmaceutical intermediates, polymer composites, PCB assemblies, and lithium-ion battery modules—without cross-contamination risk. Its stainless steel interior meets USP material compatibility requirements for non-metallic components used in regulated environments. While not pre-certified to IEC 61000-4 electromagnetic immunity standards, the unit complies with EN 61000-6-2/6-4 emission limits when installed per manufacturer-specified clearance guidelines. It supports audit-ready operation under GLP and GMP frameworks through optional RS485/USB data logging interfaces and compatible software that provides electronic signatures, audit trails, and 21 CFR Part 11–compliant user access controls.

Software & Data Management

The embedded controller logs real-time temperature and humidity values at user-defined intervals (1–60 min) and stores up to 30 days of historical data internally. Optional USB/RS485 connectivity enables seamless integration with third-party SCADA platforms or LIMS systems. The dedicated PC software (supplied separately) offers graphical trend analysis, deviation alerting, report export (PDF/CSV), and batch-level metadata tagging—supporting traceability for ISO/IEC 17025 accreditation audits. All data files are timestamped, digitally signed, and append-only to prevent tampering—meeting ALCOA+ data integrity principles.

Applications

• Accelerated stability testing of biologics and vaccines per ICH Q5C guidelines at controlled sub-zero temperatures.
• Environmental stress screening (ESS) of aerospace electronics under combined low-temperature/humidity cycling.
• Long-term storage validation for blood bank inventory management systems requiring continuous −30 °C to −40 °C operational envelopes.
• Material aging studies on elastomers, adhesives, and packaging films under elevated RH (≥85 %RH) and thermal soak conditions.
• Calibration verification of portable hygrometers and thermocouples using NIST-traceable reference probes placed inside the chamber workspace.

FAQ

What is the chamber’s temperature recovery time after door opening?
Under standard test conditions (−20 °C setpoint, ambient 25 °C/50 %RH), full recovery to ±0.5 °C tolerance requires ≤12 minutes following a 30-second door opening.
Can the unit operate continuously at −40 °C and 95 %RH simultaneously?
No—maximum achievable humidity decreases with decreasing temperature due to physical saturation limits; at −40 °C, the theoretical dew point corresponds to <1 %RH. The controller enforces physically feasible setpoint combinations per ASHRAE Fundamentals Chapter 1.
Is remote monitoring supported out-of-the-box?
Basic remote status viewing (setpoints, current readings, alarm status) is enabled via Ethernet-ready controller firmware; full telemetry and control require optional network module and licensed software.
What maintenance intervals are recommended for optimal performance?
Refrigerant circuit inspection every 24 months; condenser coil cleaning every 3 months in dusty environments; humidity sensor recalibration annually or per ISO/IEC 17025 internal procedure.
Does the chamber meet CE or UKCA marking requirements?
The LHS-1000CL conforms to the essential health and safety requirements of the EU Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU; CE marking documentation is provided upon request for EU-based distributors.