AYAN DC36S Fully Enclosed Water Bath Nitrogen Evaporator

Overview

The AYAN DC36S Fully Enclosed Water Bath Nitrogen Evaporator is an engineered solution for parallel sample concentration in analytical laboratories performing quantitative residue analysis, environmental testing, food safety screening, and pharmaceutical quality control. It operates on the principle of gentle, controlled nitrogen gas sweeping across solvent surfaces immersed in a precisely regulated water bath—enabling efficient solvent removal while minimizing thermal degradation, oxidation, and cross-contamination. Unlike open-bath or dry-block evaporators, the DC36S integrates full enclosure with dual optical-grade transparent windows, internal recirculating airflow, and positive-pressure nitrogen distribution to eliminate volatile organic compound (VOC) leakage, ensuring operator safety and compliance with occupational exposure limits (e.g., OSHA PELs, ACGIH TLVs). Its design reflects collaborative input from Zhejiang University of Technology, emphasizing reproducibility, traceability, and hands-off operation during unattended runs.

Key Features

• 7-inch capacitive touchscreen interface with intuitive navigation, real-time parameter display (temperature, elapsed time, remaining time, pressure status), and password-protected access levels for method integrity.
• Programmable temperature control with five operational modes and up to 50 configurable segments per method—supporting ramp-hold-cool profiles tailored to thermally labile analytes such as pesticides, mycotoxins, or lipid mediators.
• Fully enclosed chamber with dual-layer tempered glass viewing windows (front and top), integrated LED illumination, and adjustable-height tube racks—enabling continuous visual monitoring without compromising containment integrity.
• Independent electromagnetic flow control per needle channel ensures precise, consistent nitrogen delivery across all 36 positions; automatic pressure regulation maintains setpoint regardless of active channel count or sequential activation.
• Auto-refill water reservoir with level sensor, overflow drain port, and dry-heating cutoff—eliminating manual top-up and preventing heater damage during extended operation.
• Dual-seal door mechanism with built-in circulation fan maintains negative pressure differential relative to ambient lab air, preventing VOC escape and eliminating need for external fume hood integration.
• Corrosion-resistant construction: 304 stainless steel frame, silicone-free rubber gaskets (phthalate-free formulation), and chemically inert wetted surfaces compatible with acetonitrile, methanol, ethyl acetate, and hexane-based extraction solvents.
• Intelligent resume function: Upon lid opening, the system pauses and retains full program state—including active segment, remaining time, and temperature setpoint—resuming seamlessly upon closure without reconfiguration.

Sample Compatibility & Compliance

The DC36S accommodates standard laboratory vessels including 16 mm OD test tubes, centrifuge tubes (15–50 mL), conical flasks, and cuvettes up to 200 mm height via vertically adjustable support racks. All materials in contact with samples conform to USP Class VI biocompatibility standards and are free of leachable plasticizers. The system supports GLP/GMP-aligned workflows through audit-trail-capable method storage, timestamped run logs, and parameter lockout features. While not certified to IEC 61010-1 or UL 61010B out-of-the-box, its electrical architecture complies with CE marking requirements for laboratory equipment (2014/30/EU EMC Directive and 2014/35/EU LVD Directive). For regulated environments, users may validate temperature uniformity per ASTM E2251–22 and nitrogen flow consistency per ISO 8573-1:2010 Class 4.

Software & Data Management

No proprietary software installation is required—the DC36S operates autonomously via embedded firmware. All methods, runtime logs, and alarm events (e.g., lid open, low water, temperature deviation >±2 °C) are stored internally in non-volatile memory with time/date stamping. Up to 100 user-defined protocols can be saved, each supporting multi-step temperature programming, variable gas-on timing (0–9999 seconds per channel), and segment-specific hold conditions. Data export is available via USB flash drive (FAT32 formatted) in CSV format for integration into LIMS or ELN systems. The interface supports multi-language selection (English, Spanish, French, Chinese) and meets FDA 21 CFR Part 11 readiness criteria when paired with institutional electronic signature policies.

Applications

This evaporator is routinely deployed in accredited testing laboratories for: pesticide residue analysis (AOAC 2007.01, EN 15662); veterinary drug quantification in meat and milk (EU Commission Decision 2002/657/EC); polycyclic aromatic hydrocarbon (PAH) cleanup prior to GC-MS analysis; preparation of calibration standards for LC-MS/MS bioanalysis; and post-SPE eluate concentration in clinical toxicology. Its stable thermal environment (±1 °C uniformity across 36 positions at 40 °C) and minimal solvent loss variability (<3% RSD between replicates) make it suitable for ISO/IEC 17025 method validation studies where intermediate precision must be demonstrated.

FAQ

What types of solvents are compatible with the DC36S water bath?
Distilled or deionized water is required as the heating medium. Organic solvents must never be used—thermal decomposition or fire hazard may result.
Can the instrument be used without connecting to an external nitrogen source?
No. A regulated nitrogen supply (0–10 L/min, 0.1–0.4 MPa) is mandatory for operation. Compressed air is not recommended due to moisture and oil contamination risks.
Is routine maintenance required beyond weekly water changes?
Yes. Weekly replacement of bath water is essential; additionally, needle tips should be rinsed with methanol after each use and inspected monthly for clogging or corrosion.
Does the DC36S meet environmental safety standards for VOC containment?
When operated with intact seals and closed lid, internal air exchange rate is <0.5 ACH, and VOC leakage is below detection limit (<0.1 ppm) for common solvents—verified by EPA Method TO-17 screening.
How is temperature uniformity validated across all 36 positions?
Users may perform in-house mapping using calibrated PT100 probes per ASTM E2251; typical results show ≤±0.8 °C deviation at 60 °C across the bath surface.