Yoyi LHS-300HC Temperature and Humidity Controlled Chamber (300 L, Microprocessor PID Control)

Overview

The Yoyi LHS-300HC is a precision-engineered upright temperature and humidity controlled chamber designed for long-term environmental simulation under tightly regulated conditions. It operates on the principle of active dual-control thermodynamics—integrating independent refrigeration, resistive heating, and vapor-phase humidification systems—to maintain stable thermal and hygric environments across its 300 L working volume. Unlike basic incubators, this chamber employs a forced-air convection system with optimized wind tunnel architecture to ensure uniform temperature distribution (±1 °C uniformity) and low spatial gradient, critical for reproducible stability testing, accelerated aging studies, and biostability assessment. Its operational envelope—0–60 °C and 40–95 %RH—is validated per national standards GB/T 10586–2006 (Wet-Heat Test Chambers), GB/T 2424.6–2006 (Performance Verification), and GJB/J 3827–1999 (Calibration Procedures)—making it suitable for laboratories requiring traceable, auditable environmental conditioning in regulated sectors including pharmaceuticals, medical device R&D, and polymer science.

Key Features

• Microprocessor-based PID control system with intuitive large-screen LCD interface supporting up to 99 programmable cycles, each comprising 30 customizable segments (max. 99 h 59 min per segment) for complex multi-step environmental profiles.
• Double-glazed observation door with silicone-sealed glass window ensures minimal thermal leakage while enabling real-time visual monitoring without compromising chamber integrity.
• Interior constructed from electropolished mirror-finish stainless steel (SUS304), featuring radius-rounded corners and adjustable stainless-steel shelving for ease of cleaning and flexible sample arrangement.
• Environmentally compliant refrigeration using R134a/R406a blended refrigerant; energy-efficient heating elements and a self-designed electric-tube humidification system with built-in water reservoir ensure stable RH output and low maintenance overhead.
• Four-directional casters with independent locking feet enable secure positioning and smooth relocation within lab or cleanroom environments.
• High-efficiency air circulation system with rear-mounted centrifugal blower and directional ducting delivers uniform airflow and minimizes vertical/horizontal thermal stratification.

Sample Compatibility & Compliance

The LHS-300HC accommodates diverse sample formats—including Petri dishes, culture flasks, sealed vials, electronic components, textile swatches, and polymer specimens—within its 580 × 540 × 950 mm stainless-steel chamber. Its design supports both static and dynamic testing protocols, such as ICH Q1A(R3)-aligned stability studies, ASTM D4332 (Standard Practice for Conditioning Containers, Packages, or Packaging Components for Testing), and ISO 188 (Rubber—Accelerated Ageing and Heat Resistance Tests). The chamber’s ±3 %RH deviation and ±1 °C temperature fluctuation meet GLP-aligned validation requirements for routine QC/QA labs. All electrical and safety functions comply with IEC 61010-1, and humidity sensing utilizes calibrated capacitive sensors traceable to NIM (National Institute of Metrology, China).

Software & Data Management

While the standard configuration features standalone microcontroller operation, optional RS485 communication interface enables integration with LabVIEW, MATLAB, or custom SCADA platforms for remote monitoring and automated data logging. The optional embedded thermal printer provides hard-copy audit trails of setpoints, actual values, alarms, and cycle timestamps—supporting 21 CFR Part 11-compliant record retention when paired with appropriate electronic signature workflows. All parameter changes are logged with timestamp and operator ID (via optional password protection), satisfying basic GMP documentation expectations for change control and traceability.

Applications

• Pharmaceutical stability testing per ICH guidelines (long-term, accelerated, intermediate conditions)
• Biological sample preservation and microbial growth studies under defined hygrothermal stress
• Polymer and elastomer aging evaluation (e.g., tensile strength degradation, discoloration kinetics)
• Electronics component reliability screening (moisture sensitivity level pre-conditioning)
• Textile and coating performance assessment under cyclic humidity exposure
• Food packaging barrier property validation (water vapor transmission rate correlation)
• Environmental stress screening for automotive interior materials (ISO 16750-4)

FAQ

What is the maximum allowable ambient temperature for continuous operation?
The unit is rated for ambient conditions ≤30 °C and ≤70 %RH (non-condensing); operation beyond these limits may compromise cooling capacity and humidity control accuracy.
Does the chamber support external data export via USB or Ethernet?
No native USB or Ethernet port is included; however, the RS485 interface (optional add-on) permits serial data streaming to external PCs or PLCs using Modbus RTU protocol.
Can the internal water tank be refilled during active humidification cycles?
Yes—the integrated reservoir is accessible from the front panel and designed for top-up without interrupting ongoing tests.
Is calibration certification provided with shipment?
Factory calibration reports (temperature and humidity at three points) are supplied standard; full ISO/IEC 17025-accredited calibration is available upon request as a paid service.
What safety protections are built into the system?
Over-temperature cut-off, compressor high-pressure shutdown, door-open alarm, and independent mechanical over-temperature limiter (optional accessory, +¥500) are standard.