DRETOP THS Series High-Low Temperature and Humidity Cycling Test Chamber

Overview

The DRETOP THS Series High-Low Temperature and Humidity Cycling Test Chamber is an engineered environmental simulation system designed for rigorous reliability validation of industrial components and finished products under dynamically alternating thermal and hygrothermal stress conditions. Based on the principles of forced-air convection, dual-stage refrigeration, and precision PID-controlled steam humidification, the THS chamber replicates real-world climatic exposures—including rapid temperature transitions, sustained high/low temperature dwell, constant humidity, and cyclic wet-dry phases—as defined in international test standards such as MIL-STD-810G (GJB 150.3, 150.4, 150.9), IEC 60068-2, and GB/T 2423. Its architecture supports deterministic, repeatable execution of multi-segment environmental profiles—critical for accelerated life testing, qualification of electronics, automotive ECUs, LED modules, aerospace subassemblies, and medical device enclosures.

Key Features

• Industrial-grade 7-inch full-color capacitive touchscreen HMI with bilingual (English/Chinese) interface, configurable user access levels, and password-protected operation to prevent unauthorized parameter modification.
• Programmable logic controller supporting up to 1000 stored test programs, each comprising up to 100 individual segments—with independent ramp rate control for temperature and humidity, hold time definition, lighting cycle scheduling, and custom test naming.
• Independent, closed-loop control of heating (Ni-Cr alloy resistive elements), cooling (imported hermetic scroll compressors with eco-friendly R404A/R23 cascade refrigeration), and humidification (electric steam generator) systems—ensuring optimal energy efficiency, reduced cross-interference, and extended component service life.
• Optimized air circulation path with centrifugal forced-convection blower, aerodynamically tuned ductwork, and uniform airflow distribution—achieving ≤2 °C temperature uniformity across the working volume and rapid recovery (<3 min) after door opening per IEC 60068-3-5.
• Double-layer tempered safety glass observation window with integrated anti-frost heating film and LED interior lighting—preventing condensation-induced sample contamination and enabling real-time visual monitoring without thermal disturbance.
• Stainless steel 304 interior chamber with radius-rounded corners, removable adjustable shelves (2 standard), electrostatically coated carbon steel exterior, and heavy-duty casters with locking mechanism for safe relocation and stable positioning.
• Comprehensive safety architecture: over-temperature cut-off, compressor/fan overload protection, leakage current detection, phase failure monitoring, and automatic power restoration after grid interruption—all compliant with IEC 61000-4 EMC requirements.

Sample Compatibility & Compliance

The THS Series accommodates a broad range of sample geometries and electrical configurations via standardized 50 mm diameter test ports (standard), enabling live monitoring of voltage, current, signal integrity, or pneumatic pressure during environmental exposure. It meets the physical and procedural requirements of multiple military, industrial, and international standards—including GJB 150.3 (high temperature), GJB 150.4 (low temperature), GJB 150.9 (damp heat), IEC 60068-2-1 (cold), -2-2 (dry heat), -2-30 (cyclic damp heat), and GB/T 2423.1–4. The chamber’s design supports GLP-aligned operation: audit trails for parameter changes, timestamped event logging, and non-volatile memory retention of all operational data—even during power loss.

Software & Data Management

Standard RS485 Modbus RTU and optional USB interfaces enable seamless integration with laboratory data acquisition networks. The embedded controller logs real-time temperature/humidity values at user-defined intervals (1 s to 60 min), stores up to 10,000 hours of historical data internally, and exports structured CSV or Excel-compatible files directly to external storage. For centralized fleet management, the optional cloud-enabled remote monitoring package provides HTML5-compliant web access, native iOS/Android mobile applications, and synchronized multi-user dashboards—with role-based permissions (administrator, operator, viewer), concurrent session support (up to 5 users), and firmware-over-the-air (FOTA) update capability. All remote interactions are encrypted (TLS 1.2+) and maintain full traceability per FDA 21 CFR Part 11 electronic record requirements.

Applications

• Qualification testing of printed circuit boards (PCBs), connectors, and semiconductor packaging under thermal shock and moisture ingress conditions.
• Validation of automotive infotainment systems, ADAS sensors, and battery management units across −40 °C to +85 °C operating envelopes.
• Environmental stress screening (ESS) of consumer electronics—smartphones, wearables, and IoT gateways—prior to field deployment.
• Material compatibility assessment for adhesives, conformal coatings, and elastomeric seals exposed to prolonged humidity cycling.
• Accelerated aging studies of medical device housings, sterilization trays, and diagnostic reagent cartridges under ISO 14971 risk management frameworks.

FAQ

What temperature and humidity ranges are supported across the THS model variants?
The THS Series offers four base temperature configurations: THS-A (−20 °C to +120/150 °C), THS-B (−40 °C to +120/150 °C), THS-C (−60 °C to +120/150 °C), and THS-D (−70 °C to +120/150 °C), all with 20–98 % RH capability. Humidity control is unavailable below +10 °C.
Is the chamber suitable for continuous unattended operation?
Yes—equipped with automatic restart after power failure, runtime metering, programmable start/stop scheduling, and comprehensive fault diagnostics with audible/visual alerts and relay-triggered shutdown.
Can the THS be integrated into an existing LIMS or MES environment?
Via optional RS485 Modbus TCP or Ethernet/IP protocols, the chamber supports bidirectional communication with enterprise-level laboratory information management systems (LIMS) and manufacturing execution systems (MES), including alarm forwarding, setpoint synchronization, and raw data streaming.
What maintenance intervals are recommended for long-term reliability?
Compressor oil and refrigerant checks every 24 months; steam generator descaling every 3 months (frequency depends on local water hardness); air filter replacement every 6 months; annual calibration verification of PT100 sensors and capacitive humidity transducers using NIST-traceable references.
Does DRETOP provide IQ/OQ documentation packages for regulated industries?
Yes—validated installation qualification (IQ) and operational qualification (OQ) protocols, pre-executed test reports, and instrument-specific calibration certificates are available upon request for pharmaceutical, aerospace, and medical device customers requiring GMP/GLP compliance.