Senjing CH928B Professional Fully Automatic Dehumidifier
| Brand | Senjing Electric |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | CH928B |
| Price | Upon Request |
| Dehumidification Capacity | 28 L/day (at 30°C, 80% RH) |
| Energy Efficiency Ratio | 45% higher than China National Standard GB/T 19411–2003 |
| Control Interface | Microprocessor-based digital humidity controller with 4 preset humidity setpoints |
| Display | Real-time digital relative humidity readout (%) |
| Air Delivery | Adjustable wide-angle louvered outlet |
| Filtration System | Silver-ion antimicrobial filter + negative ion generator |
| Compressor Protection | Thermal overload and high-pressure cut-off |
| Defrosting | Automatic hot-gas defrost system |
| Water Tank | 5 L transparent high-impact polycarbonate tank with ergonomic carry handle and overflow sensor |
| Drainage | Continuous external drainage port (Ø12 mm) |
| Mobility | Dual-locking omnidirectional casters + foldable top handle |
| Operating Temperature Range | 5–35°C |
| Power Supply | 220 V AC, 50 Hz |
| Rated Power Input | 450 W |
| Sound Pressure Level | ≤47 dB(A) at 1 m |
| Net Weight | 20 kg |
| Dimensions (H×W×D) | 585 × 350 × 300 mm |
| Applicable Area | Up to 60 m² (ceiling height 2.8 m) |
Overview
The Senjing CH928B Professional Fully Automatic Dehumidifier is engineered for precise ambient humidity control in regulated laboratory environments where moisture-sensitive instrumentation, hygroscopic reference standards, chemical reagents, or biological sample storage require stable relative humidity (RH) conditions. Utilizing a high-efficiency refrigerant-based condensation cycle with R134a refrigerant and a hermetically sealed rotary compressor, the unit achieves consistent dehumidification performance across its operational range of 5–35°C ambient temperature. Its 28 L/day capacity (tested per ISO 4359:2019 methodology at 30°C/80% RH) supports climate stabilization in analytical labs, calibration rooms, material testing chambers, and controlled storage areas—particularly where ISO/IEC 17025-compliant environmental monitoring is mandated.
Key Features
- Microprocessor-controlled humidity regulation with four programmable setpoints (30%, 40%, 50%, 60% RH), enabling reproducible environmental conditioning aligned with ASTM E145–22 and ISO 12779:2021 requirements for lab environmental validation.
- Digital RH display with ±3% accuracy (calibrated at 25°C/50% RH), providing real-time feedback for GLP/GMP documentation and audit-ready traceability.
- Integrated silver-ion antimicrobial filter and negative ion generator reduce airborne microbial load and particulate agglomeration—supporting ISO 14644-1 Class 8 cleanroom-adjacent applications.
- Automatic hot-gas defrost system prevents ice buildup on evaporator coils during low-temperature operation (down to 5°C), ensuring uninterrupted performance without manual intervention.
- Compressor protection circuitry includes thermal overload cutoff and high-pressure safety switch, extending service life under continuous 24/7 operation typical in central lab utility zones.
- Omnidirectional locking casters and foldable top handle facilitate safe repositioning within constrained lab layouts while maintaining stability during active operation.
Sample Compatibility & Compliance
The CH928B is suitable for use in laboratories handling moisture-sensitive materials including but not limited to: lithium battery electrode slurries, pharmaceutical excipients (e.g., microcrystalline cellulose, lactose monohydrate), desiccant reference standards (e.g., saturated salt solutions per ISO 4882), and optical components requiring dew-point control. It complies with IEC 60335-1 (safety of household and similar electrical appliances) and IEC 60335-2-40 (particular requirements for heat pumps, air-conditioners and dehumidifiers). While not certified for hazardous locations, its non-sparking motor design and grounded chassis meet general-purpose electrical safety expectations in non-explosive lab zones. The unit supports environmental qualification protocols required by FDA 21 CFR Part 11 Annex 11 when integrated into validated humidity management systems.
Software & Data Management
The CH928B operates as a standalone analog-digital hybrid device with no embedded firmware update capability or network interface. All operational parameters—including runtime, current RH reading, and setpoint selection—are accessible via front-panel controls and display only. For integration into centralized environmental monitoring systems (EMS), optional third-party data loggers (e.g., HOBO UX100-011 or Testo 177-H1) may be deployed externally to record RH and temperature trends at user-defined intervals. Such configurations support ALCOA+ data integrity principles when paired with appropriate audit trail and electronic signature workflows per GAMP 5 guidance.
Applications
- Stabilization of weighing rooms (USP , Ph. Eur. 2.1.31) to minimize hygroscopic mass drift during analytical balance calibration and sample preparation.
- Maintenance of ≤40% RH in X-ray diffraction (XRD) sample storage cabinets to prevent hydration-induced peak broadening in zeolites or metal–organic frameworks (MOFs).
- Prevention of condensation on cryogenic equipment surfaces and vacuum chamber viewports in low-temperature physics labs.
- Humidity control in polymer characterization labs during dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA) preconditioning steps per ASTM D618 and ISO 291.
- Support of accelerated stability testing chambers (ICH Q1A) by serving as auxiliary dehumidification for ambient/humidity-controlled storage zones.
FAQ
Does the CH928B support remote monitoring or IoT connectivity?
No. The unit lacks Ethernet, Wi-Fi, or Bluetooth interfaces. Remote data acquisition requires external logging hardware.
Is the silver-ion filter replaceable, and what is its service life?
Yes—the filter is user-replaceable; Senjing recommends replacement every 6 months under continuous operation or after 2,000 hours of cumulative runtime.
Can this unit operate continuously at 5°C ambient temperature?
Yes, provided relative humidity remains ≥60% RH; below this threshold, frost accumulation may trigger extended defrost cycles, reducing net dehumidification output.
What is the maximum allowable continuous drainage hose length?
For gravity-fed external drainage, the manufacturer specifies a maximum vertical lift of 1.2 m and total hose length ≤3 m using 12 mm ID PVC tubing.
Is the unit compliant with EU RoHS or REACH regulations?
As an imported device distributed under U.S. regulatory oversight, it carries RoHS-compliant component certifications per IEC 63000:2018; full REACH SVHC screening documentation is available upon request from Senjing’s technical support team.
