DRETOP SEH-55 Benchtop Temperature and Humidity Controlled Chamber

Overview

The DRETOP SEH-55 Benchtop Temperature and Humidity Controlled Chamber is an engineered environmental simulation system designed for precise, repeatable conditioning of materials and components under controlled thermal and hygroscopic stress. Based on dual-loop PID-controlled heating and refrigeration circuits—coupled with a high-efficiency air-cooled condensing unit and a stainless-steel evaporator—the chamber maintains stable climatic conditions via forced-air convection with optimized airflow distribution. Its compact benchtop footprint (55 L internal volume) enables integration into QC labs, R&D workstations, and production line validation environments without requiring dedicated floor space or structural modifications. The SEH-55 supports accelerated reliability testing protocols—including temperature cycling, damp heat exposure, and steady-state aging—per industry-standard environmental stress profiles defined in IEC 60068-2-1 (cold), IEC 60068-2-2 (dry heat), and IEC 60068-2-30 (damp heat). It is routinely deployed for evaluating solder joint integrity, polymer dimensional stability, conformal coating adhesion, and electronic component parametric drift across automotive ECUs, medical device PCBs, and semiconductor packaging substrates.

Key Features

• Microprocessor-based P.I.D. control system with full-color LCD interface, enabling intuitive multi-segment programming (up to 30 steps) for temperature/humidity ramps, holds, cycles, and timed start/stop sequences—supporting unattended operation up to 999 hours.
• Dual independent control loops: nickel-chromium heating elements with dynamic power modulation and an air-cooled refrigeration circuit with variable-speed compressor staging ensure rapid thermal response and minimized overshoot.
• Uniform humidity distribution achieved through a high-capacity ultrasonic humidifier (optional) or steam generator (standard), integrated with a self-cleaning evaporative system and automatic condensate drainage.
• Double-glazed observation window with inner tempered glass and outer magnetic-seal door provides >85% light transmittance while minimizing thermal bridging and fogging during low-temperature/high-humidity operation.
• Stainless-steel interior chamber (SUS304), removable adjustable shelves rated for 150 °C dry-heat sterilization, and seamless corner welds facilitate GMP-compliant cleaning and eliminate cross-contamination risks.
• Comprehensive safety architecture including over-temperature audiovisual alarm, compressor protection logic (start delay, stop interval, high-pressure cut-off), anti-dry-burn safeguard for humidification systems, and real-time fault logging.

Sample Compatibility & Compliance

The SEH-55 accommodates samples up to 300 mm in height and 350 mm in width—ideal for PCB assemblies, small medical instruments, sensor modules, optical components, and polymer test coupons. Its internal dimensions (320 × 400 × 430 mm) allow placement of standard ISO 17025-compliant calibration reference sensors (e.g., Rotronic HC2-AW, Vaisala HMP155) for chamber mapping per ASTM E2297 and ISO/IEC 17025 Clause 6.4.2. The chamber conforms to GB/T 2423.1–4 (Environmental Testing for Electrical and Electronic Products), GB/T 10586 (Technical Specifications for Damp Heat Test Chambers), GJB 150.3A–2009 and GJB 150.4A–2009 (MIL-STD-810G equivalent for high/low temperature laboratory testing), and IEC 60068-2 series standards. Optional RS485 Modbus RTU interface supports traceable data export for GLP/GMP audit trails when paired with validated data acquisition software.

Software & Data Management

The built-in controller stores all operational logs—including setpoints, actual chamber readings, alarm events, and program execution history—with timestamped records retained for ≥30 days. An optional USB data logger module enables CSV export of time-series temperature/humidity data at user-defined intervals (1 s to 60 min resolution). For enterprise integration, the RS485 port allows bidirectional communication with LIMS or MES platforms using standard Modbus RTU protocol. All configuration changes are logged with operator ID and timestamp, satisfying FDA 21 CFR Part 11 requirements for electronic records and signatures when deployed with compliant third-party software (e.g., WinCC OA, LabVIEW DAQmx).

Applications

• Accelerated life testing of consumer electronics enclosures under combined thermal-hygric stress (e.g., IPC-9701, JEDEC JESD22-A101)
• Pre-conditioning of lithium-ion battery cells prior to electrochemical characterization (UN 38.3 Section 38.3.4)
• Stability assessment of pharmaceutical excipients and sterile packaging materials per ICH Q1A(R2)
• Validation of adhesive bond strength in automotive trim components under cyclic humidity exposure (SAE J2412)
• Calibration verification of relative humidity sensors and dew point meters in metrology labs
• Material compatibility screening for conformal coatings, potting compounds, and encapsulants used in aerospace avionics

FAQ

What is the maximum sample weight the SEH-55 can accommodate without compromising airflow uniformity?
The chamber supports static loads up to 15 kg distributed across two adjustable shelves; exceeding this may impede convective circulation and degrade temperature/humidity uniformity beyond ±0.5 °C / ±5 %RH specifications.
Does the SEH-55 support external sensor input for chamber mapping or product-core monitoring?
Yes—standard left-side Ø25 mm port enables feedthrough of PT100 probes, thermocouples (Type K/J), or capacitive RH sensors; optional analog voltage (0–10 V) or 4–20 mA inputs available via expansion module.
Is the humidification system compatible with deionized water only, or can tap water be used?
Deionized or distilled water is required to prevent mineral scaling in the humidifier reservoir and evaporator; use of tap water voids the 24-month parts warranty on humidification components.
Can the SEH-55 be operated continuously for extended periods (e.g., 30-day aging tests)?
Yes—designed for uninterrupted operation up to 999 hours per program cycle; the controller retains all settings and resumes from last known state after power interruption.
What documentation is provided for IQ/OQ qualification?
Factory-supplied documents include Installation Checklist, Operational Qualification Protocol (OQ-P), as-found/as-left calibration reports (NIST-traceable), and full electrical schematics—compatible with vendor-agnostic PQ execution by end-user QA teams.