Chu Ding Technology DN-24A 24-Position Dry-Block Nitrogen Evaporator

Overview

The Chu Ding Technology DN-24A is a precision-engineered 24-position dry-block nitrogen evaporator designed for reproducible, oxygen-free sample concentration in analytical laboratories. Unlike water-bath systems, this instrument employs a thermally optimized aluminum heating block with embedded high-stability PT100 sensors to deliver rapid, uniform thermal transfer across all 24 sample positions. Nitrogen gas—delivered via independent, height-adjustable stainless-steel nozzles—is directed tangentially onto the liquid surface of each tube, minimizing solvent evaporation time while preventing oxidation and analyte degradation. The system operates on the principle of forced convection under inert atmosphere, making it particularly suitable for thermally sensitive compounds encountered in LC-MS, GC-MS, environmental residue analysis, forensic toxicology, and pharmaceutical stability studies. Its compact footprint (310 × 220 × 420 mm), low mass (~5 kg), and energy-efficient 600 W heating module support integration into regulated lab environments where space, safety, and traceability are critical.

Key Features

• 24-position dry-block design with machined aluminum heating block ensuring exceptional thermal conductivity and spatial uniformity (±0.2 °C accuracy across all wells)
• Independent, vertically adjustable nitrogen delivery nozzles—each sealed and isolated—to eliminate cross-contamination between samples
• Digital PID temperature control with real-time feedback from embedded PT100 sensors; setpoint range: ambient to 180 °C
• Robust mechanical architecture enabling continuous operation at elevated temperatures (e.g., 120–160 °C) without thermal drift or component fatigue
• Integrated gas pressure regulation interface compatible with standard laboratory nitrogen manifolds (< 0.6 MPa inlet pressure)
• Front-panel LED display with intuitive navigation for temperature setting, timer function, and status indication
• Compliance-ready construction: non-corrosive anodized aluminum housing, CE-marked power supply, and EMI-shielded electronics

Sample Compatibility & Compliance

The DN-24A accommodates standard 16 mm outer-diameter round-bottom tubes, centrifuge tubes, and crimp-top vials commonly used in EPA Method 525.3, ISO 17025-accredited residue labs, and USP residual solvent workflows. Its dry-block configuration avoids water contamination risks associated with bath-based systems—critical when processing halogenated solvents or moisture-sensitive extracts. The instrument meets general electrical safety requirements per IEC 61010-1 and supports GLP/GMP-aligned documentation through external data logging (via optional RS232/USB interface). While not intrinsically certified for Class I Div 1 environments, its nitrogen-only operation and absence of open flame or steam make it appropriate for fume hood–integrated workflows compliant with OSHA 1910.1200 and CLSI GP26-A4 guidelines.

Software & Data Management

The DN-24A operates as a standalone benchtop unit with local digital control; no proprietary software is required for basic operation. For audit-trail compliance in regulated environments (e.g., FDA 21 CFR Part 11, ISO/IEC 17025), users may connect the optional serial interface to validated third-party laboratory information management systems (LIMS) or electronic lab notebooks (ELN). Temperature setpoints, run duration, and operator ID can be logged externally with timestamping. Firmware supports password-protected parameter locking to prevent unauthorized modification during routine QC runs—aligning with ALCOA+ data integrity principles.

Applications

• Routine concentration of pesticide residues (e.g., organophosphates, pyrethroids) prior to GC-ECD or LC-MS/MS analysis per EN 15662 and AOAC 2007.01
• Preparative cleanup of biological matrices (plasma, urine, tissue homogenates) in clinical toxicology and doping control laboratories
• Final solvent removal in method development for HPLC mobile phase optimization and reference standard reconstitution
• High-throughput sample preparation for EPA SW-846 Methods 3510C (liquid-liquid extraction) and 3540C (Soxhlet extraction)
• Controlled evaporation of volatile organic compounds (VOCs) in air monitoring canister analysis workflows

FAQ

What tube sizes are supported by the DN-24A?

The standard 24-hole aluminum block is configured for 16 mm OD round-bottom test tubes or centrifuge tubes. Custom blocks for 10 mm or 18 mm formats are available upon request.
Is the nitrogen flow rate individually adjustable per channel?

No—the DN-24A uses a single regulated inlet manifold. Flow distribution is balanced mechanically via calibrated orifices in each nozzle; precise per-channel flow control requires external multi-channel mass flow controllers.
Can the instrument be used under inert atmosphere gloveboxes?

Yes—its compact dimensions, low heat dissipation, and absence of vented bath components allow safe integration into nitrogen-purged or argon-filled glovebox workstations.
Does the DN-24A include validation documentation?

Factory calibration certificates (temperature uniformity and accuracy verification at 40 °C, 80 °C, and 120 °C) are provided. IQ/OQ protocols compatible with GxP environments can be supplied separately.
What maintenance is required for long-term reliability?

Annual inspection of heating block flatness, nozzle alignment, and PT100 sensor calibration is recommended. No consumables or lubricants are required under normal operating conditions.