DRETOP DRH-55AC Benchtop Temperature and Humidity Controlled Chamber

Overview

The DRETOP DRH-55AC Benchtop Temperature and Humidity Controlled Chamber is an engineered environmental simulation system designed for precision reliability testing of electronic components, medical devices, automotive modules, and advanced materials under controlled thermal and hygroscopic stress conditions. Operating on the principle of forced-air convection with dual independent PID-controlled heating and refrigeration circuits, the chamber maintains stable, repeatable microclimate conditions across its 55 L internal workspace. Its compact benchtop footprint (320 × 400 × 430 mm internal dimensions) enables integration into QA laboratories, R&D cleanrooms, and production-line validation stations without requiring floor-standing infrastructure. The system meets fundamental requirements for accelerated aging, storage stability assessment, and preconditioning per internationally recognized environmental test standards—including IEC 60068-2 series, GB/T 2423, and GJB 150—making it suitable for use in GLP-compliant environments where traceability and parameter reproducibility are critical.

Key Features

• Microprocessor-based 30-segment programmable controller with full-color capacitive touchscreen interface, supporting ramp-soak-hold profiles, cyclic humidity/temperature sequences, and scheduled start/stop functions (maximum runtime: 999 hours).
• Dual-loop P.I.D. control architecture with automatic power-loss recovery: resumes pre-interruption setpoints and retains all logged data points upon re-energization.
• Optimized air distribution system featuring a low-noise axial fan and laminar-flow duct design, ensuring uniform temperature distribution (±0.5 °C) and humidity homogeneity (±3–5 %RH) throughout the chamber volume.
• Corrosion-resistant stainless-steel interior chamber with removable, autoclavable shelves (rated for steam sterilization up to 150 °C), facilitating contamination-free testing of biocompatible or sterile-grade samples.
• Double-glazed observation window with inner tempered glass and outer magnetic-seal door, minimizing thermal bridging while enabling real-time visual monitoring without compromising environmental integrity.
• Integrated safety subsystems including dry-run protection for humidifier, auto-drain function for condensate management, compressor anti-short-cycle logic (start delay + stop interval), and audible/visual over-temperature alarm.

Sample Compatibility & Compliance

The DRH-55AC accommodates PCB assemblies, IC packages, polymer films, pharmaceutical packaging, sensor modules, and small-format medical disposables within its accessible internal volume. Its 25 mm-diameter left-side test port supports external thermocouple feedthroughs, humidity probe calibration, or real-time data acquisition via third-party DAQ systems. The chamber conforms to GB/T 2423.1 (cold), GB/T 2423.2 (dry heat), GB/T 2423.3 (damp heat, steady state), and GB/T 10586 (technical specifications for humidity chambers). It also satisfies military-standard environmental test protocols GJB 150.3A–2009 (high-temperature laboratory testing) and GJB 150.4A–2009 (humidity testing), as well as IEC 60068-2-1 (cold), -2-30 (damp heat, cyclic), and -2-38 (damp heat, high humidity). While not inherently 21 CFR Part 11 compliant, audit-ready operation is achievable through optional logging software with user-access controls and electronic signature support.

Software & Data Management

Equipped with standard RS485 serial communication (Modbus RTU protocol), the DRH-55AC enables bidirectional integration with laboratory information management systems (LIMS) or centralized environmental monitoring platforms. Optional PC-based software provides real-time graphing, configurable alarm thresholds, CSV export of time-stamped temperature/humidity logs, and report generation aligned with ISO/IEC 17025 documentation requirements. All recorded data includes timestamp, setpoint, actual value, and operational status flags—supporting retrospective analysis and deviation investigation during quality audits.

Applications

• Accelerated life testing of consumer electronics under combined thermal-hygrometric stress.
• Stability evaluation of active pharmaceutical ingredients (APIs) and primary packaging under ICH Q1 guidelines.
• Preconditioning of sensors and MEMS devices prior to functional validation.
• Material compatibility testing for adhesives, conformal coatings, and encapsulants used in automotive ECUs.
• Qualification of printed circuit board assemblies (PCBAs) per IPC-J-STD-004 and JEDEC JESD22-A101.
• Environmental screening of diagnostic reagent kits and point-of-care devices under variable RH exposure.

FAQ

What is the maximum allowable ambient operating temperature for the DRH-55AC?

The unit is rated for installation in rooms maintained at ≤30 °C ambient temperature with adequate ventilation; higher ambient temperatures may impair cooling capacity and extend stabilization times.
Can the chamber operate continuously for extended durations (e.g., 30 days)?

Yes—its robust compressor duty cycle, self-cleaning evaporator, and redundant safety interlocks support unattended long-term operation when configured with appropriate maintenance intervals.
Is the humidity system capable of generating dew point-controlled profiles?

No—the DRH-55AC regulates relative humidity directly; dew point control requires optional external instrumentation or post-processing of logged RH and temperature data.
Does the unit include NIST-traceable calibration certificates?

Factory calibration is performed using reference-grade sensors; certified traceable calibration (NIST or CNAS-accredited) is available as a paid service option upon order.
How frequently should preventive maintenance be scheduled?

DRETOP recommends quarterly inspection of air filters, condensate drain lines, and door gasket integrity, plus annual verification of sensor accuracy and control loop response.