JianHu JH-Series Walk-In Temperature and Humidity Environmental Test Chamber

Overview

The JianHu JH-Series Walk-In Temperature and Humidity Environmental Test Chamber is an engineered solution for long-duration, large-volume environmental simulation under controlled thermal and hygrometric conditions. Designed in accordance with IEC 60068-2, ISO 16750-4, and ASTM D4332 standards, this chamber employs a dual-loop PID-controlled air-handling system to maintain stable and reproducible test environments. Its core measurement principle relies on high-stability platinum resistance thermometers (PT100) and capacitive humidity sensors traceable to NIST standards, integrated with a microprocessor-based controller that continuously monitors and corrects deviations in real time. Unlike benchtop units, the walk-in architecture supports full-scale testing of industrial equipment, automotive subassemblies, aerospace components, or entire electronic control cabinets—enabling evaluation of thermal expansion, condensation resistance, material aging, and functional reliability across defined climatic profiles.

Key Features

• Robust structural design featuring 100 mm thick polyurethane insulation (thermal conductivity ≤ 0.022 W/m·K) sandwiched between double-walled galvanized steel panels with seamless welding to minimize thermal bridging.
• High-efficiency air circulation system with backward-curved centrifugal fans and optimized duct geometry ensures temperature uniformity ≤ ±2°C and humidity uniformity ≤ ±3% RH across the full working volume—even at extreme setpoints.
• Air-cooled refrigeration circuit utilizing hermetic scroll compressors (selected from Embraco or Panasonic) paired with copper-aluminum finned evaporators and precision expansion valves for stable low-temperature operation down to 15°C ambient start conditions.
• Stainless steel tubular heating elements with overheat protection and independent humidity generation via steam injection (PID-controlled stainless steel boiler) ensure rapid, non-condensing RH ramping between 30–98% RH.
• Double-sealed insulated door with magnetic gasket and mechanical latch system achieves leak rate < 0.5 m³/h at 25 Pa differential pressure—critical for maintaining boundary condition integrity during extended cycling tests.

Sample Compatibility & Compliance

The JH-Series accommodates samples up to 3 m (W) × 2.5 m (D) × 2.2 m (H), with optional floor loading capacity of 500 kg/m². It supports static and dynamic thermal-hygric cycling per MIL-STD-810H Method 502.7 (Temperature), Method 507.6 (Humidity), and GB/T 2423.3–2016 (China National Standard). The chamber’s internal surface finish meets ISO 14644-1 Class 8 cleanroom requirements, making it suitable for pre-compliance testing of medical devices (IEC 60601-1), automotive ECUs (ISO 16750-4), and semiconductor packaging (JEDEC JESD22-A101). All electrical systems comply with CE marking directives (2014/30/EU EMC, 2014/35/EU LVD), and data logging functionality supports audit-ready records compliant with FDA 21 CFR Part 11 when used with optional validation software.

Software & Data Management

Equipped with JianHu’s proprietary TH-Control Pro v4.2 embedded controller, the chamber provides intuitive touchscreen operation (7-inch TFT LCD, IP65-rated) and Ethernet-enabled remote monitoring via Modbus TCP or OPC UA protocols. The system logs timestamped temperature/humidity values at user-defined intervals (1 s to 60 min), stores ≥12 months of data internally (16 GB flash memory), and exports CSV, PDF, or XML reports with digital signature support. Optional IQ/OQ/PQ documentation packages include calibration certificates (traceable to CNAS-accredited labs), uncertainty budgets, and deviation tracking logs aligned with GLP and GMP quality systems. Firmware updates are delivered via secure HTTPS portal with version rollback capability.

Applications

This chamber serves as a primary tool for accelerated environmental stress screening (ESS) and qualification testing across regulated and industrial sectors. Typical use cases include: validating moisture barrier performance of flexible OLED encapsulation layers; verifying thermal shutdown behavior of Li-ion battery packs under combined 40°C/95% RH soak; assessing paint adhesion durability on automotive body panels per SAE J2527; conducting shelf-life studies of pharmaceutical packaging per USP ; and performing climate-induced corrosion pre-screening of printed circuit board assemblies prior to salt spray exposure. Its modular construction allows integration with external power supplies, data acquisition systems, or robotic handling interfaces for fully automated test cells.

FAQ

What is the standard lead time for custom-sized chambers?
Standard configurations ship within 6–8 weeks; custom dimensions, extended temperature ranges, or special coatings require 10–14 weeks after final engineering review.
Can the chamber be validated for ISO/IEC 17025 accredited laboratories?
Yes—JianHu provides full validation documentation including installation qualification (IQ), operational qualification (OQ), and performance qualification (PQ) protocols executed by certified metrologists.
Is remote firmware update supported without onsite technician intervention?
Yes—the embedded controller supports over-the-air (OTA) firmware updates via encrypted HTTPS connection with SHA-256 signature verification.
Does the system meet electromagnetic compatibility requirements for operation near sensitive instrumentation?
All models are tested per EN 61326-1:2013 and include ferrite-core filtered power inputs and shielded signal cabling to ensure co-location with oscilloscopes, spectrum analyzers, or mass spectrometers.
What maintenance intervals are recommended for sustained compliance with ASTM D4332?
Sensor recalibration every 12 months, refrigerant circuit inspection every 24 months, and full airflow mapping every 36 months—documented in the included Maintenance Logbook and tracked via the controller’s service scheduler.