Chengmengweiye CM-24S Electrically Adjustable Water Bath Nitrogen Evaporator

Overview

The Chengmengweiye CM-24S Electrically Adjustable Water Bath Nitrogen Evaporator is an engineered solution for controlled, parallel solvent evaporation in analytical laboratories. It operates on the principle of gentle inert gas displacement—introducing regulated nitrogen or compressed air across the surface of heated liquid samples to accelerate solvent removal without thermal degradation. Unlike dry-block or infrared evaporators, the water bath design ensures uniform thermal transfer and minimizes temperature gradients across all 24 sample positions. The system integrates precise PID-based digital temperature control with electric motor-driven vertical adjustment of both the sample support plate and gas delivery manifold—enabling reproducible positioning relative to meniscus height for optimal evaporation efficiency. Designed for routine use in QC, environmental testing, pharmaceutical development, and food safety labs, the CM-24S meets fundamental operational requirements for GLP-compliant sample preparation workflows where traceability, repeatability, and method robustness are critical.

Key Features

• Electric dual-axis lift mechanism synchronously raises/lowers the stainless steel sample tray and gas distribution assembly—eliminating manual repositioning and reducing operator variability.
• 24-position spring-loaded tube holder with engraved numeric identifiers ensures unambiguous sample tracking and accommodates tubes from Ø10 mm to Ø29 mm (1–50 mL volume range).
• Independent needle-level adjustment per channel via precision-machined stainless steel guide sleeves; each gas needle (120 mm length) is fitted with a SMC TUS-certified fluoropolymer-lined regulator valve for fine-grained flow control (0–15 L/min total, ~330 mL/min per position).
• Double-gas-path configuration supports switching between nitrogen (for oxygen-sensitive analytes) and compressed air (for stable matrices), with dedicated inlet ports and pressure-rated (0.2 MPa) fittings.
• 304 stainless steel water bath basin (Ø400 × 200 mm depth) coupled with 1000 W heating element delivers rapid thermal response and maintains stability within ±0.5°C across the full operating range (RT+5°C to 99°C).
• Intelligent LCD controller (66 × 45 mm display) features programmable timer (0–9999 min), over-temperature cut-off, dry-run protection, and real-time temperature logging capability.
• Compact footprint (420 × 420 mm base) optimized for fume hood integration; fully solvent-resistant construction—including SMC TUS transparent tubing and electropolished metal surfaces—ensures compatibility with acetonitrile, methanol, chloroform, and other common extraction solvents.

Sample Compatibility & Compliance

The CM-24S accepts standard laboratory vessels including round-bottom test tubes, conical centrifuge tubes (up to 50 mL), and small-volume vials. Its mechanical design accommodates variable fill levels and tube geometries without requiring adapter inserts. All wetted components—including gas needles, bath liner, and sample support disk—are constructed from ASTM A240 304 stainless steel and certified non-reactive toward organic solvents per ISO 10993-5 cytotoxicity screening protocols. While not individually certified to IEC 61010-1, the unit conforms to general electrical safety principles required for Class II laboratory equipment used in ventilated enclosures. When operated inside a certified fume hood meeting ANSI/ASHRAE 110 standards, it satisfies OSHA 1910.1200 and EU REACH requirements for handling volatile hazardous substances.

Software & Data Management

The CM-24S operates as a standalone instrument with embedded firmware—no external PC or proprietary software is required for basic operation. However, its digital controller logs timestamped temperature setpoints and actual bath readings at user-defined intervals (configurable via menu). These records can be exported manually via USB interface (optional module) for inclusion in electronic lab notebooks (ELN) or LIMS systems. The device supports audit trail functionality compliant with FDA 21 CFR Part 11 when integrated into validated environments using third-party data acquisition platforms that enforce user authentication, electronic signatures, and immutable storage protocols.

Applications

• Pesticide residue analysis in fruits, vegetables, grains, and plant tissues (aligned with AOAC 2007.01 and EN 15662 methods)
• Residual solvent quantification in herbal extracts and finished pharmaceutical dosage forms (per USP & Ph. Eur. chapters on residual solvents)
• Trace contaminant enrichment from aqueous environmental matrices—groundwater, wastewater, and drinking water—prior to GC-MS or LC-MS/MS analysis
• Clinical toxicology workflows involving serum, plasma, urine, and whole blood deproteinization and analyte concentration
• Dioxin and PCB congener isolation in food surveillance programs (e.g., EU Regulation No. 882/2004)
• Flavor compound isolation and stabilization in dairy, wine, and beverage R&D pipelines

FAQ

What types of gas sources are compatible with the CM-24S?
Nitrogen (recommended for oxidation-prone compounds) and oil-free compressed air (suitable for thermally stable analytes) are supported via separate inlet ports rated for 0.2 MPa maximum pressure.
Can the instrument be used without a fume hood?
No. Due to potential exposure to volatile organic vapors during evaporation, operation must occur within a properly functioning chemical fume hood meeting local ventilation codes.
Is calibration documentation provided with the unit?
A factory-issued temperature verification report (at 40°C, 60°C, and 80°C) is included; users are responsible for periodic in-house recalibration per ISO/IEC 17025 or internal SOPs.
How is gas flow distributed across the 24 channels?
A master flowmeter controls total input, while individual needle valves allow independent regulation per position—enabling method-specific optimization without cross-channel interference.
What maintenance is required for long-term reliability?
Monthly inspection of O-rings, cleaning of bath interior with mild detergent, and annual verification of heater element resistance and thermostat accuracy are recommended.