Jiayuan MD-24 24-Position Water Bath Nitrogen Evaporator

Overview

The Jiayuan MD-24 24-Position Water Bath Nitrogen Evaporator is an engineered solution for controlled, gentle solvent removal from multiple liquid samples simultaneously. It operates on the principle of inert gas-assisted surface evaporation: nitrogen gas—delivered via adjustable stainless-steel needles—is directed tangentially across the surface of heated samples in a thermostatically regulated water bath. This combination of precise temperature control and laminar nitrogen flow accelerates solvent volatilization while minimizing analyte degradation, oxidation, or thermal decomposition—critical for thermolabile compounds in environmental, pharmaceutical, and clinical applications. Unlike dry-block evaporators, the water bath design ensures uniform thermal distribution, eliminating hot spots and enabling reproducible concentration kinetics across all 24 positions. The system is purpose-built for laboratories requiring GLP-compliant sample preparation prior to GC, HPLC, LC-MS, or ICP-MS analysis.

Key Features

• 24-position circular stainless-steel sample rack with engraved numeric identifiers for unambiguous sample tracking and traceability.
• Spring-loaded, height-adjustable tube clamps accommodate tubes (10–29 mm OD), centrifuge vials, conical flasks, and culture tubes (1–50 mL capacity).
• Individually controllable stainless-steel gas delivery needles (150 mm standard length), each fitted with precision needle valves for independent flow regulation per sample position.
• Digital PID temperature controller with real-time LED display; maintains setpoint within ±1 °C across ambient to 99 °C range.
• Corrosion-resistant 304 stainless-steel water bath chamber (Φ40 × 20 cm internal dimensions) with over-temperature cut-off and dry-run protection circuitry.
• Flexible PTFE-coated silicone gas tubing (imported, odorless, solvent-resistant) and fully stainless-steel gas manifold ensure compatibility with acetonitrile, methanol, chloroform, hexane, and other organic solvents.
• Rotatable circular platform allows ergonomic access to all sample positions without repositioning the instrument—optimized for integration into fume hoods or laminar flow cabinets during toxic solvent handling.

Sample Compatibility & Compliance

The MD-24 supports routine use with biological matrices (serum, plasma, urine, tissue homogenates), environmental extracts (soil leachates, wastewater, drinking water), agricultural residues (fruit/vegetable washes, grain extracts), and pharmaceutical formulations (herbal tinctures, tablet dissolution media). Its construction complies with IEC 61010-1 safety standards for laboratory electrical equipment. All wetted materials—including the bath liner, gas needles, and clamping hardware—are chemically inert and certified non-leaching under ISO 10993-5 cytotoxicity testing. When operated inside a certified fume hood with appropriate exhaust velocity (≥0.5 m/s at sash opening), the system meets OSHA 1910.120 and EU Directive 2004/40/EC requirements for occupational exposure control during volatile organic compound (VOC) processing.

Software & Data Management

While the MD-24 operates as a standalone analog-digital hybrid instrument (no embedded software), its temperature setpoint, actual bath temperature, and gas flow status are logged manually or via external data acquisition systems compliant with FDA 21 CFR Part 11. Laboratories implementing electronic lab notebooks (ELN) or LIMS can integrate instrument usage records using time-stamped operator entries linked to batch IDs. Optional RS-485 interface modules (sold separately) enable remote monitoring and alarm triggering (e.g., temperature deviation >±2 °C, low-water-level alert) for audit-ready process documentation under ISO/IEC 17025 and GMP Annex 11 frameworks.

Applications

• Pesticide residue analysis: Concentration of QuEChERS extracts from fruits, vegetables, cereals, and plant tissues prior to GC-ECD or LC-MS/MS quantification (ASTM D7066, EN 15662).
• Pharmaceutical QC/QA: Solvent exchange and volume reduction of herbal extract fractions, dissolution samples, and stability-indicating assay preparations per USP <1058> and ICH Q5C guidelines.
• Environmental monitoring: Pre-concentration of EPA Method 525.3 (drinking water) and 8270D (soil/sediment) extracts containing PAHs, PCBs, phthalates, and dioxins.
• Clinical toxicology: Preparation of blood, urine, and serum specimens for therapeutic drug monitoring and forensic screening by LC-MS/MS (CLSI C62-A).
• Food safety testing: Cleanup and concentration steps in melamine, mycotoxin (aflatoxin B1), and veterinary drug residue workflows aligned with ISO 17025-accredited methods.

FAQ

What is the maximum recommended sample volume per tube?
Each position accommodates up to 50 mL in compatible vessels; however, optimal evaporation efficiency is achieved with 1–20 mL volumes to maintain consistent gas-surface interaction and minimize bumping.
Can the instrument be used with gases other than nitrogen?
Yes—argon or compressed air may be substituted depending on analyte sensitivity; however, nitrogen is strongly recommended for oxygen-sensitive compounds and to avoid oxidation artifacts.
Is calibration certification available?
Factory calibration reports (temperature accuracy verification at 40 °C, 60 °C, and 80 °C) are provided with each unit; third-party ISO/IEC 17025 calibration services are supported upon request.
How is maintenance performed on the gas distribution system?
Stainless-steel needles and valve assemblies require periodic cleaning with methanol followed by nitrogen purge; no lubrication or replacement parts are needed within the first 5 years of normal operation.
Does the MD-24 meet CE or UL safety marking requirements?
The unit carries CE marking per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD); UL listing is available under custom OEM configuration with additional certification lead time.