Chengmeng CM-24TS 24-Position Corrosion-Resistant Water Bath Nitrogen Evaporator

Overview

The Chengmeng CM-24TS is a 24-position corrosion-resistant water bath nitrogen evaporator engineered for precise, reproducible solvent removal in analytical laboratories. It operates on the principle of gentle inert gas (N₂ or compressed air) sweeping across heated liquid surfaces—accelerating evaporation while minimizing thermal degradation, oxidation, or analyte loss. Unlike dry-block or aluminum-block systems, the CM-24TS employs a circular stainless-steel water bath with PTFE-coated internal components, ensuring uniform thermal distribution and long-term compatibility with aggressive solvents—including concentrated acids, bases, and halogenated organics. Its design adheres to fundamental principles of controlled convective mass transfer, where gas velocity, temperature gradient, and exposure geometry are independently adjustable per sample position. This enables method robustness across diverse matrices—from pesticide residues in plant tissue to pharmaceutical metabolites in plasma—while maintaining compliance with standard operating procedures required under GLP and ISO/IEC 17025 environments.

Key Features

• Corrosion-resistant architecture: All wetted and structural parts—including gas needles, guide tubes, bath liner, and sample support disc—are coated with high-purity PTFE or constructed from chemically inert stainless steel (316 grade).
• Independent gas needle positioning: Each of the 24 PTFE-coated 18-gauge needles (120 mm length) features motor-assisted vertical travel (80 mm range), allowing precise height adjustment relative to meniscus level for optimal gas impingement.
• Dual-gas capability: Integrated dual-inlet manifold supports simultaneous connection to nitrogen (for oxygen-sensitive analytes) and compressed air (for stable compounds), each regulated via individual SMC TUS fluoropolymer tubing and precision needle valves.
• Intelligent PID temperature control: 66×45 mm backlit LCD interface displays real-time bath temperature with ±0.1 °C resolution; programmable timer (0–9999 min) with overtemperature cutoff and dry-run protection (auto-shutoff at low water level).
• Ergonomic sample handling: Rotatable 360° sample disc facilitates unobstructed access to all positions within confined fume hood spaces; spring-loaded tube clamps with engraved numeric identifiers ensure repeatable placement and traceability.
• Compact footprint: 420×420 mm base occupies minimal benchtop area while accommodating up to 50 mL per tube across diameters from 10 to 29 mm (e.g., 15 mL conical tubes, 20 mL scintillation vials, or 50 mL centrifuge tubes).

Sample Compatibility & Compliance

The CM-24TS accommodates standard laboratory vessels including round-bottom test tubes, conical centrifuge tubes, scintillation vials, and small-volume flasks (1–50 mL capacity). Its PTFE-coated gas delivery system and non-reactive bath interior meet material compatibility requirements for EPA Method 508.1 (halogenated pesticides), AOAC 2007.01 (multi-residue analysis), and USP residual solvents testing. The instrument’s temperature uniformity (≤0.5 °C at 60 °C) and stability (±0.5 °C) satisfy calibration traceability needs per ISO 17025 Clause 6.4.2. When operated inside certified fume hoods (ASHRAE 110-tested), it supports safe concentration of volatile organic compounds (VOCs), chlorinated solvents, and low-boiling-point analytes in accordance with OSHA 1910.1200 and EU CLP Regulation.

Software & Data Management

The CM-24TS operates as a standalone benchtop instrument without proprietary software dependency. All operational parameters—including setpoint temperature, ramp rate, hold time, and gas flow initiation—are configured directly via the front-panel LCD interface. The system logs no internal data but provides full manual audit trail capability: temperature setpoints, timer activation timestamps, and physical configuration (e.g., needle height, tube ID) can be recorded in laboratory notebooks or LIMS-compatible electronic records. For regulated environments requiring 21 CFR Part 11 compliance, external environmental monitoring devices (e.g., calibrated thermistors with data loggers) may be deployed in parallel to document thermal performance during validation protocols.

Applications

• Agricultural residue analysis: Rapid concentration of QuEChERS extracts from fruits, vegetables, grains, and soil prior to GC-MS or LC-MS/MS injection.
• Pharmaceutical quality control: Solvent exchange and volume reduction of API solutions, dissolution samples, and stability-indicating assay preparations.
• Environmental testing: Pre-concentration of drinking water, wastewater, and sediment extracts for PCBs, PAHs, and dioxin/furan analysis per EPA Methods 1613 and 8270.
• Clinical toxicology: Parallel processing of serum, plasma, urine, and whole blood samples in forensic drug screening workflows.
• Food safety: Cleanup and concentration steps in melamine, mycotoxin, and veterinary drug residue testing per ISO 17025-accredited methods.
• Materials science: Controlled drying of nanosuspensions, polymer solutions, and catalyst precursors where thermal homogeneity and chemical inertness are critical.

FAQ

What types of solvents are compatible with the CM-24TS?
The PTFE-coated gas needles, SMC fluoropolymer tubing, and stainless-steel bath liner are resistant to acetone, methanol, acetonitrile, dichloromethane, ethyl acetate, hydrochloric acid (up to 6 M), sodium hydroxide (up to 2 M), and most common organic and aqueous extraction solvents.
Can the instrument be validated for GMP use?
Yes—the CM-24TS supports IQ/OQ/PQ documentation through third-party calibration of its temperature sensor (traceable to NIST standards) and verification of gas flow linearity using certified rotameters. Its mechanical simplicity and absence of firmware reduce validation complexity compared to microprocessor-driven alternatives.
Is the water bath equipped with a drain valve?
No, the bath lacks a built-in drain; however, its removable PTFE-coated inner liner allows rapid, spill-free emptying and cleaning between batches.
Does the system include a nitrogen generator?
No—the CM-24TS requires an external nitrogen source (≥99.5% purity, 0.2 MPa supply pressure) or compressed air line with appropriate filtration (0.01 µm particulate + coalescing + activated carbon).
How is cross-contamination prevented between samples?
The 360° rotatable sample disc, independent needle height control, and spatial separation of gas outlets minimize aerosol carryover; additionally, all PTFE surfaces are autoclavable or solvent-rinsable to eliminate residue buildup.