Drawell Kjeldahl Digester DW-SH220F

Drawell Kjeldahl Digester DW-SH220F

Product overview

The DW-SH220F Kjeldahl Digester is designed for high-throughput sample digestion before Kjeldahl nitrogen and protein analysis. Its 20-position graphite heating block provides uniform heat transfer across all digestion tubes. PID temperature control, rapid heating, corrosion-resistant construction, and an integrated gas collection system help laboratories achieve efficient and consistent digestion while improving operational safety.

The Drawell Kjeldahl Digester DW-SH220F supports research, pharmaceutical, environmental, food, industrial, and quality-control laboratories. Scientific China provides model selection, configuration review, export coordination, and formal quotations.

Key features

• Reaches 450°C in 25 minutes with PID temperature control.
• Uniform graphite-block heating for consistent digestion.
• 4.3-inch color screen for real-time monitoring.
• Corrosion-resistant design for strong-acid digestion.
• Gas collection hood with suction pump for fume removal.
• Over-current, over-temperature, and overload protection.
• Air-duct insulation maintains uniform tube temperature and stable reflux
• Causes: Rapid temperature rise, high fat/sugar content in samples, excessive sample weight, no anti-bumping boiling stones added.
• Solutions: Adopt gradient low-temperature heating (hold at 180°C for 30 min first before raising temperature); reduce sample weighing amount; add glass boiling stones; pre-carbonize high-sugar and high-fat samples at low temperature in advance.
• Causes: Sulfate precipitates after sulfuric acid cools down; incomplete digestion; excessive rapid cooling.
• Solutions: Pour waste liquid while hot; add a small amount of pure water for dilution before cooling. For residual black dirt, add dilute sulfuric acid for reheating digestion, then soak and clean after cooling.
• Causes: Aging heating wires, carbon deposits inside heating holes leading to poor heat conduction, offset temperature control sensors, uncovered heat insulation cover.
• Solutions: Clean residues on inner walls of heating holes; calibrate temperature sensors; contact after-sales service to replace aged heating units; keep the furnace cover closed during the whole digestion process.
• White smoke is normal, which is SO₃ produced by high-temperature decomposition of concentrated sulfuric acid.

Applications

• Quantitative or qualitative laboratory analysis
• Research, method development, and routine quality control
• Application-specific testing with suitable accessories and methods

Technical specifications

Ordering and configuration

Final specifications, included accessories, consumables, software, certifications, power requirements, installation, warranty, and regulatory availability depend on the selected model and destination. Contact Scientific China to confirm the suitable configuration, minimum order quantity, price, lead time, documentation, and international delivery terms before purchase.