Nabertherm LV 9/11 Laboratory Muffle Furnace
| Brand | Nabertherm |
|---|---|
| Origin | Germany |
| Model | LV 9/11 |
| Instrument Type | Box-type Muffle Furnace |
| Max Temperature | 1100°C |
| Temperature Uniformity | ±3°C |
| Rated Power | 3000 W |
| Heating Time to Max Temp | 120 min |
| Heating Method | Resistance Wire Heating |
| Internal Dimensions | 230 × 240 × 170 mm (W × D × H) |
| Chamber Volume | 9 L |
| External Dimensions | 480 × 550 × 900 mm (W × D × H) |
| Weight | 45 kg |
| Electrical Supply | Single-phase, 230 V, 50/60 Hz |
Overview
The Nabertherm LV 9/11 is a precision-engineered laboratory muffle furnace designed specifically for ashing, calcination, and thermal treatment of inorganic and organic samples under controlled oxidizing or inert atmospheres. Built upon Nabertherm’s decades-long heritage in high-temperature thermal processing, the LV 9/11 operates on the principle of radiant heat transfer via embedded resistance heating elements integrated into double-sided ceramic heating plates—ensuring uniform thermal distribution across the entire chamber while minimizing contamination from volatilized residues. Its optimized air exchange system delivers ≥6 complete air changes per minute, with preheated inlet air maintaining stable thermal homogeneity (±3°C at 1100°C) throughout the 9 L working volume. The furnace conforms to EN 60519-2 for industrial electroheating equipment safety and incorporates dual thermal protection: an independent overtemperature limiter (Class 2 thermal cut-off per EN 60519-2) and microprocessor-based PID control with real-time deviation monitoring.
Key Features
- Double-sided ceramic heating plates with recessed resistance wire elements—resistant to chemical attack and mechanical impact; fully replaceable without disassembling the furnace lining
- High-efficiency forced-air ventilation system with preheated intake air, enabling rapid equilibration and minimizing thermal gradients during prolonged ashing cycles
- Robust double-walled stainless steel housing (brushed AISI 304) with low-conductivity mineral fiber insulation—outer surface temperature remains ≤55°C at maximum operating temperature
- Front-hinged, counterbalanced door with ceramic fiber gasket seal and optional external door extension for safe sample loading/unloading in confined workspaces
- Integrated solid-state relay (SSR) switching for silent, jitter-free power modulation and extended component lifetime
- Compliance-ready architecture: supports GLP/GMP data integrity requirements through NTLog USB data logging and optional VCD process control software
Sample Compatibility & Compliance
The LV 9/11 accommodates standard crucibles (porcelain, alumina, platinum, graphite) and sample boats up to 230 mm wide × 240 mm deep × 170 mm high. Its oxidation-stable chamber environment is suitable for AOAC 942.05, ISO 2171, ASTM E1755–01, and USP ash content determination protocols. All internal components meet RoHS Directive 2011/65/EU material restrictions. The furnace is CE-marked and certified to IEC 61000-6-3 (EMC emission) and IEC 61000-6-2 (immunity). Optional overtemperature protection modules satisfy FDA 21 CFR Part 11 audit trail requirements when used with validated VCD software configurations.
Software & Data Management
The built-in Nabertherm NTLog controller enables time-stamped recording of setpoint, actual temperature, and power output directly onto USB flash drives (FAT32 formatted), generating CSV files compatible with Excel, MATLAB, and LIMS integration. For advanced process automation, the optional VCD (Virtual Control Device) software provides real-time remote monitoring, multi-step program editing, alarm configuration, and electronic signature support. All logged data include operator ID, timestamp, and instrument serial number—fully traceable for ISO/IEC 17025 accreditation audits. Firmware updates are performed via USB without requiring factory service intervention.
Applications
- Quantitative ash residue analysis in foodstuffs, feedstuffs, pharmaceutical excipients, and environmental solids (e.g., soil, sludge, filter media)
- Preparation of oxide catalysts and ceramic precursors via controlled calcination
- Residue determination in polymers, textiles, and composite materials per DIN 53400 and ISO 3451
- Thermal gravimetric pre-treatment prior to XRF or ICP-OES analysis
- Ignition loss testing in cement, fly ash, and refractory raw materials (ASTM C114, EN 196-2)
- Controlled pyrolysis studies in academic and industrial R&D laboratories
FAQ
What is the recommended maintenance interval for the LV 9/11 furnace?
Nabertherm recommends visual inspection of heating elements and door seals every 200 operating hours, with full calibration verification annually using NIST-traceable thermocouples.
Can the LV 9/11 operate under nitrogen or argon purge conditions?
Yes—the furnace features dedicated gas inlet/outlet ports (M10 threads) and is rated for continuous operation under inert gas flow up to 5 L/min; optional gas flow meter and pressure regulator kits are available.
Is the NTLog USB logging function compliant with 21 CFR Part 11?
NTLog alone does not fulfill Part 11 requirements; however, when paired with VCD software configured with user authentication, electronic signatures, and audit trail archiving, full compliance is achievable.
What crucible materials are compatible with 1100°C operation?
Alumina (Al₂O₃), silicon carbide (SiC), and high-purity platinum crucibles are approved; avoid quartz above 1000°C and stainless steel below 800°C due to phase instability.
Does the LV 9/11 support ramp-soak programming?
Yes—up to 16 segments with independent ramp rates (0.1–30°C/min), soak times (1 min–99 h 59 min), and hold-to-stability criteria (±1°C for ≥5 min).
