Ketjim DHG-9013 Forced-Air Drying Oven
| Brand | Ketjim |
|---|---|
| Origin | Anhui, China |
| Model | DHG-9013-220V |
| Rated Voltage | AC 220 V, 50/60 Hz |
| Power Rating | 500 W |
| Max Operating Temperature | 300 °C (<8 h) |
| Continuous Operating Temperature | 250 °C |
| Temperature Uniformity | ±5 °C at 100 °C |
| Temperature Control Accuracy | ±1 °C |
| Heating Rate | 10 °C/min |
| Chamber Dimensions (W×D×H) | 225 mm × 255 mm × 260 mm |
| Chamber Volume | 15 L |
| External Dimensions | 430 mm × 530 mm × 450 mm |
| Net Weight | 26 kg |
| Construction | Exterior – Cold-Rolled Steel with Epoxy Coating |
| Safety Features | Bimetallic Over-Temperature Cut-Off Sensor |
| Shelving | Two Adjustable Stainless Steel Shelves |
Overview
The Ketjim DHG-9013 Forced-Air Drying Oven is a precision-engineered laboratory thermal processing instrument designed for consistent, controllable heat treatment under convective airflow conditions. Utilizing a horizontal forced-air circulation system driven by a rear-mounted centrifugal fan, the oven ensures uniform thermal distribution across the entire chamber volume—critical for reproducible drying, curing, sterilization, and thermal conditioning of samples. Its operational principle relies on active air movement to minimize thermal stratification and reduce temperature gradients, thereby improving process repeatability compared to natural-convection ovens. The unit is calibrated and validated for continuous operation up to 250 °C and short-term exposure (≤8 hours) at 300 °C, making it suitable for applications requiring elevated thermal stability without compromising structural integrity or controller performance.
Key Features
- Robust dual-layer construction: cold-rolled steel exterior with epoxy powder coating and corrosion-resistant AISI 304 stainless steel interior chamber
- Precision single-setpoint digital temperature controller with ±1 °C accuracy and intuitive LED interface
- High-efficiency mineral wool insulation (≥50 mm thickness) minimizing thermal loss and enhancing energy efficiency
- Two independently adjustable stainless steel shelves supporting flexible sample loading configurations
- Integrated bimetallic over-temperature safety cutoff sensor that de-energizes heating elements upon exceeding preset limit—compliant with IEC 61000-6-2 and EN 61000-6-3 immunity requirements
- Front-access viewing window with tempered glass enables real-time visual monitoring without thermal disruption
- Low-noise centrifugal blower (rated life >20,000 h) ensuring stable airflow velocity across full temperature range
Sample Compatibility & Compliance
The DHG-9013 accommodates a broad spectrum of non-volatile, thermally stable materials including ceramic powders, polymer films, metal oxide precursors, biological tissue sections (post-fixation), filter papers, and glassware for pre-sterilization. It is not intended for flammable solvents, volatile organic compounds, or live cultures. The oven complies with general-purpose laboratory equipment safety standards per GB/T 25137.1–2010 (Chinese national standard equivalent to IEC 61010-1) and meets electromagnetic compatibility (EMC) Class B requirements for laboratory environments. While not certified to ISO/IEC 17025 or GLP-specific validation protocols out-of-the-box, its temperature uniformity profile (±5 °C at 100 °C) supports IQ/OQ documentation when paired with external calibrated thermocouple mapping per ASTM E2251–22 or ISO 14644-3 Annex C guidelines.
Software & Data Management
This model operates as a standalone analog-digital hybrid system with no embedded firmware, cloud connectivity, or data logging capability. All operational parameters—including setpoint, actual chamber temperature, and elapsed time—are displayed locally via a 3-digit LED readout. For laboratories requiring audit-trail compliance (e.g., FDA 21 CFR Part 11 or ISO 13485), external validation-grade data loggers (e.g., Omega OM-DAQPRO-5300 or Testo 177-T4) may be integrated using the optional PT100 output port (available on upgraded variants). Routine calibration verification follows manufacturer-recommended intervals (every 6 months under continuous use) using NIST-traceable reference thermometers.
Applications
- Drying of moisture-sensitive inorganic powders prior to XRD or BET surface area analysis
- Curing of solvent-cast polymer films and composite laminates under controlled thermal ramping
- Dehydration of botanical specimens and histological tissue slices for archival storage
- Pre-heating of crucibles, boats, and quartz substrates used in thin-film deposition processes
- Thermal conditioning of electronic components and PCB assemblies during reliability screening
- Moisture content determination per AOAC 950.46 and ASTM D2231–21 gravimetric methods (when used with analytical balance)
FAQ
What is the maximum allowable ambient temperature for safe operation?
The unit is rated for installation in environments with ambient temperatures between 5 °C and 40 °C and relative humidity ≤80% non-condensing.
Can this oven be used for sterilization of surgical instruments?
No—it lacks validated cycle programming, steam generation, or vacuum-assisted air removal required for medical device sterilization per ISO 17665 or EN 285.
Is the temperature controller programmable or ramp-soak capable?
No—the DHG-9013 features a fixed single-setpoint controller only; multi-stage thermal profiles require external PID controllers or upgrade to the DHG-9070 series.
Does the chamber include a door seal gasket?
Yes—a high-temperature silicone rubber gasket ensures minimal air leakage and maintains thermal integrity during extended dwell cycles.
What maintenance is recommended for long-term reliability?
Biannual inspection of fan bearings, cleaning of air intake grilles, verification of door latch tension, and recalibration of the temperature sensor using a traceable reference standard.
