Yoyi LHS-150SC Temperature and Humidity Controlled Chamber
| Brand | Yoyi |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Direct Manufacturer |
| Model | LHS-150SC |
| Chamber Type | Upright |
| Temperature Range (with Humidification) | 15–60 °C |
| Temperature Range (dry operation) | 10–60 °C |
| Humidity Range | 50–85 %RH |
| Temperature Uniformity | ±1 °C |
| Temperature Fluctuation | ±1 °C |
| Humidity Uniformity | ±5 %RH |
| Humidity Fluctuation | ±1 %RH |
| Interior Dimensions (W×D×H) | 480×400×780 mm |
Overview
The Yoyi LHS-150SC Temperature and Humidity Controlled Chamber is an upright environmental test chamber engineered for precise, repeatable simulation of controlled thermal and hygroscopic conditions. It operates on a dual-loop microprocessor-based PID control architecture—separately regulating heating, refrigeration, and humidification subsystems—to maintain stable setpoints across extended operational cycles. The chamber employs a forced-air convection system with optimized airflow distribution via a rear-mounted centrifugal blower and multi-directional ducting, ensuring uniform temperature and humidity profiles throughout the 150 L working volume. Designed in accordance with GB/T 10586–2006 (Technical Requirements for Damp Heat Test Chambers) and GB/T 2424.6–2006 (Performance Verification of Temperature/Humidity Test Chambers), it supports standardized environmental stress testing under both ISO/IEC 17025-accredited laboratory practices and internal quality assurance protocols.
Key Features
- Mirror-finish stainless steel interior with radius-corner construction for seamless cleaning and resistance to corrosion from repeated sterilization or chemical exposure.
- Eco-friendly refrigerant R134a/R406a cooling system delivering high thermodynamic efficiency and low power consumption (rated input: 1400 W).
- Integrated water reservoir with immersed electric heating element for reliable steam-based humidification; paired with a calibrated capacitive humidity sensor (traceable to NIM standards) for closed-loop RH control.
- Dual-glazed observation door with silicone-sealed glass panel—minimizing thermal leakage while enabling real-time visual monitoring without compromising chamber stability.
- Programmable controller supporting up to 99 multi-step cycles, each comprising 30 segments with individual time settings (up to 99 h 59 min per segment); data logging interval configurable from 1 to 60 minutes.
- Adjustable stainless steel shelving (3 standard trays included), reinforced support rails, and leveling casters with locking mechanism for safe repositioning in shared lab environments.
Sample Compatibility & Compliance
The LHS-150SC accommodates a broad range of sample types—including pharmaceutical dosage forms, polymer specimens, electronic assemblies, textile swatches, microbial cultures, and packaged food products—within its validated operating envelope. Its performance meets requirements for stability testing per ICH Q1A(R2), accelerated aging per ASTM F1980, and shelf-life qualification under USP . While not certified for GLP or FDA 21 CFR Part 11 compliance out-of-the-box, the optional RS485 interface enables integration with validated LIMS or ELN platforms supporting audit-trail-enabled data capture. All units undergo factory calibration verification per GB/T 2424.6–2006 prior to shipment, with documented as-found/as-left data provided upon request.
Software & Data Management
The embedded controller features a 5.7-inch TFT LCD interface with intuitive menu navigation and multilingual support (English, Chinese). Real-time display includes current setpoints, actual values, deviation alarms, and active program status. Optional RS485 communication (Modbus RTU protocol) allows remote parameter adjustment and acquisition of timestamped temperature/humidity logs via third-party SCADA or custom Python-based monitoring scripts. An embedded thermal printer (optional add-on) provides hard-copy output of cycle summaries, including start/end timestamps, maximum/minimum deviations, and alarm events—facilitating manual record retention where electronic systems are restricted.
Applications
- Pharmaceutical stability studies (long-term, intermediate, and accelerated conditions per ICH guidelines)
- Material aging assessments for rubber, plastics, and adhesives under combined thermal-hygrometric stress
- Microbiological incubation requiring defined RH control beyond standard CO₂ incubators
- Electronics reliability screening (e.g., moisture sensitivity level (MSL) pre-conditioning per J-STD-020)
- Textile conditioning per ISO 139 and ASTM D1776 for tensile and dimensional stability testing
- Food packaging permeability validation under variable humidity gradients
FAQ
What is the minimum ambient temperature required for stable operation?
The chamber is rated for use in ambient environments between 15 °C and 30 °C at ≤80 %RH (non-condensing). Operation below 15 °C may impair compressor efficiency and extend stabilization times.
Can the unit operate continuously at 60 °C and 85 %RH?
Yes—the LHS-150SC is designed for uninterrupted operation across its full specified range. However, sustained high-humidity operation above 80 %RH requires regular maintenance of the water reservoir and periodic inspection of the humidifier electrode surface.
Is external water supply supported?
No—this model uses a self-contained 4.5 L internal reservoir. For unattended long-duration tests, manual refilling intervals must be scheduled based on humidity setpoint and chamber loading.
Does the controller support password-protected parameter modification?
Yes—three-tier access control (Operator / Technician / Administrator) is implemented via alphanumeric password authentication, preventing unauthorized changes to calibration offsets or program logic.
What safety protections are built-in?
Over-temperature cutoff (independent mechanical thermostat), compressor high-pressure shutdown, door-open alarm with automatic heater deactivation, and dry-run protection for the humidifier system.
