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 parallel sample concentration in analytical laboratories requiring precise thermal control and reproducible gas delivery. It operates on the principle of inert gas-assisted solvent evaporation—introducing a controlled stream of nitrogen or compressed air across the surface of heated liquid samples to accelerate volatilization while minimizing oxidation, thermal degradation, or cross-contamination. Unlike dry-block or infrared evaporators, the water bath design ensures uniform heat transfer to sample vessels via conduction through temperature-stabilized water, eliminating hot spots and enabling accurate maintenance of low-to-moderate evaporation temperatures (ambient to 99 °C). The system integrates motorized vertical adjustment of both the sample support platform and individual gas delivery needles, allowing real-time optimization of needle-to-surface distance for varying tube geometries and solvent volumes—critical for achieving consistent evaporation kinetics across heterogeneous sample sets.

Key Features

• Motorized dual-stage elevation: Simultaneous electric lifting of the entire 24-position sample rack and independent height adjustment of each stainless-steel gas needle (80 mm travel range), ensuring optimal gas impingement geometry regardless of tube diameter (10–29 mm) or fill volume (1–50 mL).
• Precision water bath temperature control: PID-regulated heating with ±0.5 °C stability and ≤0.5 °C uniformity at 60 °C; large-format 66×45 mm LCD display shows setpoint, actual temperature, and timer status.
• Dual independent gas pathways: Separate inlets for nitrogen (for oxygen-sensitive analytes) and compressed air (for robust matrices); integrated flow meters and SMC TUS-series fluoropolymer-coated tubing ensure chemical resistance to organic solvents including acetonitrile, chloroform, and ethyl acetate.
• GLP-ready mechanical architecture: All wetted components—including bath chamber, support tray, and needle guide blocks—are fabricated from electropolished 304 stainless steel; no adhesives or painted surfaces contact the operational zone.
• Programmable timing and safety logic: Timer range up to 9999 minutes; automatic shut-off upon reaching set duration; overtemperature cutoff and dry-bath detection prevent heater damage during unattended operation.
• Compact footprint (420×420×850 mm) optimized for fume hood integration; fully enclosed gas routing minimizes ambient nitrogen dispersion and operator exposure during toxic solvent work.

Sample Compatibility & Compliance

The CM-24S accommodates standard laboratory glassware including round-bottom test tubes (Ø10–29 mm), conical centrifuge tubes, and small-volume vials. Its spring-loaded, numbered sample holders provide secure positioning without clamping force variability—ensuring repeatable vessel alignment across runs. The system complies with fundamental requirements for method validation under ISO/IEC 17025:2017 (clause 7.2.2, equipment suitability) and supports traceable calibration practices when paired with NIST-traceable thermometers and certified flow meters. While not pre-certified to FDA 21 CFR Part 11, its deterministic timer, non-volatile parameter storage, and absence of user-modifiable firmware enable straightforward audit trail generation for internal GLP/GMP documentation. All materials meet USP Class VI biocompatibility standards for solvent contact surfaces.

Software & Data Management

The CM-24S operates as a standalone instrument with embedded microcontroller-based logic—no external PC or proprietary software required. All operational parameters (temperature setpoint, timer value, gas on/off state) are retained in non-volatile memory after power cycling. For laboratories implementing electronic lab notebooks (ELN) or LIMS integration, the device’s stable thermal and pneumatic behavior allows correlation of run metadata (start time, duration, final temperature) with downstream analytical results. Optional RS-232 or analog 0–5 V output modules (available upon request) support basic telemetry logging in SCADA or LabVIEW environments. No cloud connectivity or remote access functionality is included, preserving data sovereignty and simplifying IT validation.

Applications

This evaporator is routinely deployed in regulated and research-intensive workflows where quantitative recovery and matrix integrity are critical. Key use cases include: pesticide residue analysis in agricultural commodities (AOAC 2007.01, EN 15662); residual solvent quantification in pharmaceutical intermediates (ICH Q3C); dioxin/furan extraction prep in environmental solid-phase cleanup (EPA 1613B); plasma/serum derivatization workflows in clinical toxicology; and flavor compound isolation in beverage QA/QC. Its ability to maintain sub-1 °C thermal deviation across all 24 positions makes it suitable for inter-laboratory comparison studies requiring high inter-run reproducibility.

FAQ

Can the CM-24S be used with corrosive solvents such as hydrochloric acid or trifluoroacetic acid?
Standard configuration uses 304 stainless steel and SMC TUS tubing, which resist mild organics but are not rated for strong mineral acids or halogenated acids. For such applications, optional 316 stainless steel needle assemblies and PTFE-lined gas manifolds are available.
Is calibration certificate included with shipment?
No factory calibration certificate is supplied by default; however, the unit ships with a verification protocol document outlining procedures for user-performed temperature and flow verification using traceable standards.
What maintenance intervals are recommended?
Biannual inspection of heater element continuity, annual replacement of silicone O-rings in the water bath seal, and quarterly cleaning of gas needle orifices with ultrasonic isotope-grade methanol are advised per manufacturer guidelines.
Does the system support programmable multi-step temperature ramps?
No—the CM-24S implements single-setpoint PID control only. For gradient evaporation protocols, external programmable chillers or sequential manual reconfiguration is required.
Can I retrofit my existing CM-24S with Ethernet or USB connectivity?
Hardware-level communication upgrades are not supported; the control architecture lacks expansion headers. Future connectivity must be implemented via external PLC interfacing to the dry-contact relay outputs (available on custom order).