Chu Ding Technology DN-12W Water Bath Nitrogen Evaporator

Overview

The Chu Ding Technology DN-12W Water Bath Nitrogen Evaporator is a precision-engineered sample concentration system designed for routine and regulated laboratory workflows in analytical chemistry, environmental testing, pharmaceutical development, and forensic toxicology. It operates on the principle of gentle, inert gas-assisted solvent evaporation: nitrogen gas is delivered through individually adjustable, height-regulated nozzles positioned above heated liquid samples immersed in a thermostatically controlled water bath. This configuration ensures uniform heat transfer via conduction and convection—minimizing thermal degradation of thermolabile analytes—while maintaining an oxygen-free environment critical for oxidation-sensitive compounds such as steroids, pesticides, fatty acid methyl esters (FAMEs), and certain metabolites. Unlike dry-block evaporators, the water bath design provides superior temperature homogeneity across all 12 sample positions, reducing inter-position variability and supporting method reproducibility required under GLP and ISO/IEC 17025-compliant environments.

Key Features

• Stainless steel water bath chamber with corrosion-resistant coating and integrated digital PID temperature controller for stable, drift-free operation from ambient to 100 °C
• 12 independently adjustable stainless steel nitrogen delivery needles with fine-thread vertical positioning—enabling precise nozzle-to-surface distance control per sample
• Real-time temperature monitoring via high-accuracy PT100 sensor immersed directly in the bath medium, ensuring traceable and verifiable thermal performance
• Front-panel digital display showing setpoint, actual bath temperature, and elapsed time; intuitive rotary knob interface with lockable settings
• Robust mechanical architecture optimized for continuous duty cycles—tested for >5,000 hours of cumulative operational stability at 80 °C
• Gas flow management compatible with standard lab nitrogen generators or cylinder-based supply systems; inlet pressure regulation integrated into manifold design

Sample Compatibility & Compliance

The DN-12W accommodates standard 16 mm outer-diameter test tubes, microcentrifuge tubes (1.5–15 mL), and screw-cap vials without adapter modification. Optional tube holders (e.g., for 10 mm or 20 mm OD formats) are available upon request. The instrument meets general electrical safety requirements per IEC 61010-1 and complies with CE marking directives for laboratory equipment. While not pre-certified to FDA 21 CFR Part 11, its analog control architecture supports audit-ready documentation when paired with external loggers and SOP-controlled operation—making it suitable for QC/QA labs operating under GMP-aligned procedures. All wetted components are chemically inert and autoclavable, facilitating cleaning validation in regulated environments.

Software & Data Management

The DN-12W operates as a standalone hardware platform with no embedded firmware or proprietary software dependencies. Temperature data can be recorded externally using calibrated USB data loggers (e.g., Omega OM-DAQPRO-5300) connected to the PT100 output port (available as optional accessory). For laboratories requiring electronic records, integration with LIMS or ELN systems is achieved via analog voltage output (0–5 V corresponding to 0–100 °C) or RS-485 Modbus RTU interface (firmware upgrade option). Audit trails, user access logs, and electronic signatures are implemented at the system level—not within the device—ensuring full compliance with ALCOA+ data integrity principles when deployed within validated workflows.

Applications

• Routine cleanup and concentration of extracts prior to GC-FID, GC-MS, LC-MS/MS, and HPLC analysis
• Residue analysis in food, soil, and water matrices per EPA Method 525.3, 8270D, and EN 15662
• Forensic drug quantification workflows requiring low-temperature evaporation of blood plasma or urine extracts
• Pharmaceutical impurity profiling where residual solvent removal must avoid racemization or epimerization
• Environmental monitoring of PAHs, PCBs, and organochlorine pesticides following ISO 18333 and ASTM D7066
• Preparative-scale fraction collection in natural product isolation protocols

FAQ

Is the DN-12W compatible with nitrogen generators?

Yes—it accepts inlet pressures up to 0.6 MPa and features a built-in pressure regulator compatible with both membrane and PSA-type laboratory nitrogen generators.
Can the water bath be filled with alternative heat-transfer fluids?

Only deionized water or certified silicone oil (viscosity ≤ 50 cSt) is recommended; glycerol or ethylene glycol mixtures may impair thermal response and sensor accuracy.
What maintenance is required for long-term calibration stability?

Annual verification of bath temperature uniformity (per ASTM E220) and sensor calibration against NIST-traceable reference thermometers is advised.
Does the unit include a drain valve for bath fluid replacement?

Yes—a bottom-mounted quick-release drain valve enables complete fluid exchange without disassembly.
Are spare parts such as needle assemblies and O-rings available separately?

All consumable and wear components—including stainless steel nozzles, silicone gaskets, and bath heater elements—are stocked and supplied with full part numbers for traceability.