DRETOP SX2-5-12NC Box-Type Muffle Furnace

Overview

The DRETOP SX2-5-12NC is a precision-engineered box-type muffle furnace designed for reliable, repeatable high-temperature thermal processing in research laboratories, quality control environments, and industrial R&D settings. Operating on resistive heating principles, it utilizes high-purity nickel-chromium (NiCr) alloy wire wound uniformly across all four chamber walls to generate balanced radiant heat distribution—ensuring minimal thermal gradient (<±3 °C at 1200 °C across the working zone per ASTM E220 calibration practice). The furnace achieves stable operation from ambient +50 °C up to 1200 °C, with microprocessor-based PID regulation maintaining ±1 °C setpoint accuracy under steady-state conditions. Its rigid refractory brick chamber—lined with corrosion-resistant stainless steel at the door aperture—provides long-term dimensional stability during repeated thermal cycling, making it suitable for ashing, calcination, heat treatment, and gravimetric analysis procedures compliant with ISO 562, ASTM D3174, and USP .

Key Features

• Four-wall NiCr heating configuration ensures uniform temperature distribution and rapid thermal response (≤60 minutes to 1200 °C);
• 30-segment programmable controller enables precise ramp/soak profiles—including automatic cooling sequences—for standardized thermal protocols;
• Door-interlocked power cutoff halts heating immediately upon opening, resuming automatically after closure—critical for GLP-compliant sample handling;
• Dual-stage over-temperature protection includes primary PID-controlled limit and independent mechanical backup cutout (adjustable up to 1250 °C);
• Integrated digital voltmeter and ammeter provide real-time electrical diagnostics—supporting preventive maintenance and traceability;
• Phosphate-conversion coated steel enclosure with high-temp epoxy finish ensures structural integrity and operator safety during prolonged use;
• Front-access design with reinforced ceramic fiber gasket and ergonomic latch mechanism minimizes heat leakage and extends seal service life.

Sample Compatibility & Compliance

The SX2-5-12NC accommodates standard crucibles (up to Ø80 mm × 60 mm height), porcelain boats, and quartz trays within its 7.2 L effective chamber volume. It supports open-air, air-atmosphere, and inert-gas purged operations when equipped with optional inlet/outlet ports. All thermal cycles comply with ISO/IEC 17025 requirements for equipment qualification, and its programmable logic meets audit-trail prerequisites for FDA 21 CFR Part 11–governed environments when paired with NC-series touchscreen firmware. Calibration documentation follows NIST-traceable reference standards, and routine verification aligns with EURACHEM/CITAC guidelines for analytical thermal instrumentation.

Software & Data Management

The base N-series model features a backlit LCD interface with intuitive menu navigation and password-protected parameter editing. The NC-series upgrade introduces a 7-inch capacitive touchscreen running embedded Linux OS, supporting multi-level user permissions (Operator, Technician, Administrator), real-time temperature curve plotting, and CSV export via USB or RS485. Data logging intervals are configurable from 1 second to 60 minutes, with internal memory retaining ≥10,000 data points. Optional Modbus RTU integration allows seamless connection to SCADA systems or LIMS platforms for centralized monitoring and electronic record retention.

Applications

• Coal and coke ash content determination (ASTM D3174, ISO 1171);
• Residue-on-ignition testing of pharmaceutical excipients (USP );
• Pre-treatment of catalyst supports and ceramic precursors prior to sintering;
• Thermogravimetric sample conditioning for subsequent FTIR or XRD analysis;
• Calibration of thermocouples and RTDs using fixed-point references (e.g., Cu, Ag, Au freezing points);
• Heat aging studies of polymer composites and insulating materials per IEC 60216;
• Standardized drying and calcination of analytical reagents in environmental and food testing labs.

FAQ

What is the maximum recommended continuous operating temperature?
The SX2-5-12NC is rated for continuous operation at 1200 °C; exceeding this temperature may accelerate heating element degradation and compromise calibration stability.
Can this furnace be used under inert gas atmosphere?
Yes—when fitted with the optional inert gas inlet valve and exhaust chimney, it supports nitrogen or argon purging to prevent oxidation during heat treatment.
Is the controller compatible with external data acquisition systems?
The RS485 interface (standard on NC models, optional on N/NP) enables Modbus RTU communication for integration into lab-wide automation networks.
How often should the furnace be recalibrated?
Annual verification against NIST-traceable reference thermocouples is recommended; more frequent checks are advised for GMP-regulated processes or after mechanical impact.
Does the unit include overcurrent protection?
Yes—integrated circuit breakers (16A standard, 32A optional) safeguard against line faults, complementing the dual thermal cutoff system.