Chengmeng CM-12T Corrosion-Resistant Water Bath Nitrogen Evaporator

Overview

The Chengmeng CM-12T Corrosion-Resistant Water Bath Nitrogen Evaporator is an engineered solution for controlled, gentle solvent removal from multiple liquid samples under inert or ambient gas environments. It operates on the principle of accelerated evaporation via directed laminar gas flow—typically nitrogen—across the surface of heated samples in a precisely regulated water bath. Unlike dry-block or infrared evaporators, the water bath design ensures uniform thermal distribution and minimizes thermal shock or localized overheating, making it especially suitable for thermolabile analytes, volatile organic compounds, and acidic or alkaline matrices requiring chemical inertness throughout the evaporation process. The system integrates precise temperature regulation, independent gas flow control per position, and full corrosion resistance—enabling reliable operation in laboratories handling aggressive solvents (e.g., concentrated HCl, HF, perchloric acid), environmental extracts, pharmaceutical intermediates, and forensic toxicology specimens.

Key Features

• PTFE-coated chassis, sample holder, gas manifold, and needle guides—ensuring long-term resistance to acids, bases, and halogenated solvents
• Digital PID-controlled water bath with 66 × 45 mm LCD interface; adjustable setpoint from ambient +5 °C to 99 °C with ±0.5 °C stability
• 12-position circular rotating sample platform with engraved numeric labeling; supports tube diameters from 10 to 29 mm (OD), accommodating standard test tubes, centrifuge tubes, conical vials, and small-volume flasks
• Independent height-adjustable PTFE-coated stainless steel needles (4″ × 18 gauge, 120 mm length), each fitted with a precision needle valve for per-channel gas flow optimization
• Dual-gas inlet system compatible with both nitrogen (for oxygen-sensitive or oxidation-prone samples) and compressed air (for robust, non-reactive applications)
• Gas flow regulation via calibrated rotameter (0–15 L/min total); average consumption ~330 mL/min per position at typical operating conditions
• Integrated safety architecture including over-temperature cutoff, auto-shutoff upon water level depletion, and real-time thermal monitoring
• Compact footprint (390 × 300 × 850 mm) optimized for fume hood integration; 360° rotational access simplifies pipetting, tube loading, and visual inspection
• High-purity SMC TUS fluoropolymer tubing—compliant with USP Class VI and ISO 10993-5 biocompatibility standards—eliminates plasticizer leaching and odor interference

Sample Compatibility & Compliance

The CM-12T accommodates a broad range of sample containers and chemistries without compromising integrity or reproducibility. Its PTFE-coated architecture meets ASTM D2622 and ISO 8217 requirements for handling corrosive petroleum distillates and sulfur-containing fuels. For regulated environments—including clinical chemistry, environmental testing (EPA Methods 502.2, 525.3), and pharmaceutical QC—the instrument supports GLP/GMP workflows through traceable temperature logging (when paired with external data loggers) and configurable timer-based endpoint control. While not intrinsically 21 CFR Part 11 compliant, its deterministic operation, manual calibration records, and stable thermal/gas performance align with FDA guidance for equipment used in method validation and routine sample preparation prior to HPLC, GC-MS, or ICP-MS analysis.

Software & Data Management

The CM-12T operates as a standalone benchtop instrument with no embedded software or network connectivity. All operational parameters—including set temperature, elapsed time, and timer countdown—are displayed and adjusted locally via the front-panel LCD. For laboratories requiring electronic record retention, the unit is compatible with third-party USB or RS-232 data loggers (e.g., Omega OM-DAQPRO-5300) to capture time-stamped temperature profiles. The digital timer (0–9999 minutes) enables unattended endpoint termination, reducing operator dependency and supporting batch processing consistency across shifts. No firmware updates or cloud synchronization are implemented—ensuring deterministic behavior and eliminating cybersecurity exposure vectors common in connected lab devices.

Applications

• Concentration of environmental water extracts (e.g., PAHs, PCBs, organochlorine pesticides) prior to GC-ECD or LC-MS/MS analysis
• Preparative cleanup of biological matrices (plasma, urine, tissue homogenates) in clinical toxicology and doping control labs
• Removal of chlorinated solvents (DCM, chloroform) and strong acids (HF/HNO₃ digestates) during geochemical and metallurgical sample preparation
• Routine solvent exchange in synthetic organic chemistry workflows (e.g., DMF → MeOH, THF → EtOAc)
• Stabilization of reference standards and calibration stock solutions under inert atmosphere
• High-throughput sample prep for food safety testing (mycotoxins, veterinary drug residues) per AOAC 2012.01 and EU SANTE/11312/2021 guidelines

FAQ

Is the CM-12T suitable for use with hydrofluoric acid (HF) solutions?
Yes—the entire wetted path (bath pan, sample support, gas manifolds, and needles) is PTFE-coated, providing verified resistance to HF at concentrations up to 48% w/w below 60 °C.
Can I replace the PTFE-coated needles with glass or stainless steel alternatives?
No—only original Chengmeng PTFE-coated stainless steel needles (P/N CM-N12-PTFE) are validated for dimensional fit, gas dispersion geometry, and chemical compatibility. Substitution may compromise flow uniformity and corrosion resistance.
Does the unit include a nitrogen generator or gas regulator?
No—the CM-12T requires external gas supply with regulated pressure (0.2 MPa maximum input). A dual-stage stainless steel regulator with CGA-580/NPT outlet is recommended for nitrogen sources.
What maintenance intervals are recommended for optimal performance?
Daily: Inspect water level and clean bath surface with deionized water. Quarterly: Replace PTFE tubing if discoloration or stiffness occurs; verify temperature calibration using a NIST-traceable thermometer.
Is the water bath volume sufficient for full immersion of 25-mL volumetric flasks?
Yes—the internal bath dimensions (Φ260 × 150 mm) allow complete submersion of standard 25-mL Class A volumetric flasks when positioned vertically in the center of the rotating platform.