Zhuochi SX3-5-10D Air-Circulating Box-Type Muffle Furnace
| Brand | Zhuochi |
|---|---|
| Origin | Zhejiang, China |
| Model | SX3-5-10D |
| Type | Box Furnace |
| Max Temperature | 800 °C |
| Temperature Uniformity | ±1 °C |
| Max Power | 5 kW |
| Heating Rate (to max temp) | 30 °C/min |
| Heating Method | Resistance Wire (NiCr Alloy) |
| Internal Dimensions | 350 × 350 × 350 mm |
| Nominal Volume | 40 L |
| Voltage | 380 V, 50 Hz |
| Thermocouple Type | K-type (Chromel–Alumel) |
| Control System | Yudian Touchscreen Programmable PID Controller with SSR Output |
| Weight | 177 kg |
| Insulation | High-Emissivity Lightweight Ceramic Fiber Panels |
| Air Circulation | Integrated Forced-Air Fan for Uniform Thermal Distribution |
Overview
The Zhuochi SX3-5-10D is a precision-engineered air-circulating box-type muffle furnace designed for laboratory and industrial thermal processing applications requiring stable, uniform, and programmable high-temperature environments. Unlike conventional static-heating furnaces, this model integrates a forced-air circulation system—driven by a high-reliability axial fan—that actively homogenizes temperature distribution across the entire chamber volume. The furnace operates on the principle of convective heat transfer enhanced by optimized airflow dynamics, ensuring ≤±1 °C temperature uniformity at setpoints up to 800 °C (per ASTM E220 and ISO 9001 calibration guidelines). Its lightweight ceramic fiber insulation—comprising six-panel modular construction with low thermal mass—enables rapid heating (≤30 °C/min to maximum temperature) while reducing standby energy consumption to approximately one-third that of traditional brick-lined muffle furnaces. Designed for continuous-duty operation in GLP-compliant laboratories, R&D centers, and QC/QA departments, the SX3-5-10D meets fundamental safety and performance expectations for thermal treatment, ashing, annealing, sintering, and pre-drying protocols.
Key Features
- Forced-Air Thermal Uniformity: Integrated centrifugal air circulation system ensures ±1 °C temperature consistency throughout the 40 L working chamber (350 × 350 × 350 mm), validated per IEC 60068-2-2 (heat test methods).
- Energy-Efficient Ceramic Fiber Architecture: Ultra-low thermal mass insulation made from high-emissivity, refractory-grade alumina-silica ceramic fiber panels—rated for repeated thermal cycling between ambient and 800 °C without degradation.
- Programmable PID + SSR Control: Yudian touchscreen controller supports multi-segment ramp-soak profiles, real-time data logging, and user-defined heating/cooling rates (adjustable down to 0.1 °C/min).
- Dual-Layer Safety Protection: Primary overtemperature cutoff via independent K-type thermocouple feedback; secondary mechanical limit switch activated at 850 °C—both compliant with EN 61000-6-2 EMC and IEC 61000-6-4 emission standards.
- Modular Electrical Integration: Pre-wired configuration includes industrial-grade contactors, solid-state relays (SSRs), and shielded compensation cables—eliminating field wiring errors and supporting 21 CFR Part 11–ready audit trails when paired with optional data acquisition software.
- Ergonomic & Service-Oriented Design: Front-access service panel, bottom-mounted control cabinet, rear-mounted thermocouple port and terminal block, and standardized 380 V/50 Hz three-phase input simplify installation, maintenance, and calibration traceability.
Sample Compatibility & Compliance
The SX3-5-10D accommodates standard crucibles (alumina, quartz, stainless steel), ceramic boats, and metal trays within its unobstructed cavity. It is routinely deployed for ASTM D3175 (moisture-free ash determination), ISO 1171 (ash content in coal and coke), USP <231> (heavy metals testing), and ISO 5660-1 (fire behavior—cone calorimetry preconditioning). All structural materials—including cold-rolled steel housing (phosphate-treated and electrostatically coated in computer gray) and NiCr heating elements—meet RoHS Directive 2011/65/EU restrictions on hazardous substances. The furnace complies with CE marking requirements under the Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU. Optional NIST-traceable calibration certificates are available upon request.
Software & Data Management
The built-in Yudian AI-808P controller provides RS485 Modbus RTU communication interface (open protocol documentation supplied), enabling integration with LabVIEW, MATLAB, or custom SCADA systems for centralized monitoring and automated batch reporting. Data export supports CSV format with timestamps, setpoint history, actual temperature curves, and alarm logs. When configured with third-party validation packages (e.g., ValSuite™ or Qualisys), the system supports electronic signatures, user access levels, and 21 CFR Part 11–compliant audit trails—including operator ID, parameter changes, and event timestamps. Firmware updates are performed via USB interface without hardware modification.
Applications
- Thermal gravimetric analysis (TGA) sample preparation and pre-conditioning
- Ash content quantification in environmental, food, and pharmaceutical matrices
- Heat treatment of metallic alloys and ceramic precursors
- Residue ignition for EPA Method 1684 (sludge and biosolids analysis)
- Calibration reference source for infrared thermometers and pyrometers
- Pre-drying of filter papers, glassware, and analytical standards prior to gravimetric assays
FAQ
What is the recommended calibration frequency for routine GLP use?
Annual calibration against NIST-traceable reference thermocouples is advised; interim verification using portable dry-block calibrators every 3 months is recommended for critical applications.
Can the furnace operate continuously at 800 °C?
Yes—the SX3-5-10D is rated for continuous operation at its maximum temperature, provided ambient conditions remain within 5–40 °C and relative humidity stays below 80% non-condensing.
Is the internal chamber atmosphere oxidizing only, or can it support inert gas purging?
The standard configuration is air-atmosphere only; however, two 1/4″ NPT inlet/outlet ports (located on rear panel) allow optional inert gas (N₂ or Ar) purging when fitted with external mass flow controllers and exhaust scrubbers.
Does the controller support remote start/stop via digital I/O?
Yes—dry-contact terminals for RUN/STOP, ALARM RESET, and DOOR INTERLOCK are provided on the rear terminal block, compatible with PLC-based automation sequences.
What maintenance intervals are specified for the circulation fan and heating elements?
Fan bearings require lubrication every 2,000 operating hours; resistance wire elements typically exceed 5,000 hours of service life under proper thermal cycling regimes—full replacement kits and torque specifications are included in the technical manual.
