Chu Ding HSC-24A 24-Position Water Bath Nitrogen Evaporator

Overview

The Chu Ding HSC-24A 24-Position Water Bath Nitrogen Evaporator is an engineered solution for controlled, parallel solvent evaporation during sample preparation for analytical chemistry workflows—including liquid chromatography (LC), gas chromatography (GC), mass spectrometry (MS), and environmental residue analysis. It operates on the principle of gentle nitrogen gas displacement combined with precise water bath thermal regulation: nitrogen gas—delivered via individually adjustable stainless steel needles—is directed tangentially across the surface of samples in test tubes or vials immersed in a thermostatically stabilized water bath. This dual-mode approach minimizes oxidative degradation, prevents bumping or splashing, and ensures uniform heat transfer without direct contact between heating elements and samples. Unlike dry-block evaporators, the water bath design provides superior temperature homogeneity (< ±0.3 °C inter-position variance at 60 °C) and thermal inertia, making it especially suitable for thermally labile analytes such as pesticides, pharmaceutical metabolites, and endocrine disruptors.

Key Features

• PID-controlled digital temperature regulation with dual LED display (setpoint & actual bath temperature), offering ±0.5 °C stability across the full 25–99.9 °C range
• Adjustable-height gas distribution manifold with 24 independent 316 stainless steel delivery needles—each fitted with precision flow control valves enabling per-channel gas flow tuning from 0 to 10 L/min
• Modular water bath chamber constructed from 316 stainless steel with removable, corrosion-resistant liner; bath depth and tube immersion level are user-adjustable to accommodate varying vial heights (10–150 mm)
• Heating block assembly features interchangeable, tool-free sample holders—compatible with standard 12 × 75 mm, 13 × 100 mm, 16 × 150 mm, and 18 × 150 mm tubes; optional custom bore inserts available upon request
• All wetted surfaces—including gas manifolds, needle guides, and bath interior—are fabricated from 316 stainless steel or anodized aluminum, eliminating leachable contaminants and supporting rigorous cleaning validation per ISO 17025 requirements
• Integrated over-temperature cut-off and audible alarm system compliant with IEC 61010-1 safety standards for laboratory electrical equipment

Sample Compatibility & Compliance

The HSC-24A supports routine evaporation of organic solvents including acetonitrile, methanol, ethyl acetate, hexane, and dichloromethane under controlled inert atmosphere. Its water bath geometry accommodates both round-bottom and flat-bottom vials, with optimized gas dispersion geometry validated for recovery rates ≥92% (measured via spiked recovery studies using EPA Method 525.3). The instrument is routinely deployed in laboratories adhering to USP , ASTM D7067, and ISO/IEC 17025 quality management systems. While not inherently 21 CFR Part 11–compliant (as it lacks electronic audit trail functionality), its operational parameters—including temperature setpoints, run duration, and gas flow settings—are fully documentable via external loggers or integrated LIMS interfaces, supporting traceability in GxP environments.

Software & Data Management

The HSC-24A is a stand-alone benchtop instrument with no embedded microprocessor or network interface. All operational parameters are manually configured via front-panel controls. For laboratories requiring electronic recordkeeping, the unit integrates seamlessly with third-party data acquisition systems via analog 0–5 V output (optional add-on module) or time-stamped manual entry into validated ELN platforms. Temperature calibration certificates (traceable to NIST standards) and maintenance logs are supplied with each unit, fulfilling documentation requirements for internal QA audits and regulatory inspections.

Applications

• Routine concentration of extracts prior to GC-MS analysis in environmental testing labs (e.g., PAHs in soil, PCBs in sediment)
• Preparative cleanup steps in clinical toxicology workflows—evaporating plasma or urine extracts following solid-phase extraction (SPE)
• High-throughput residue analysis in agrochemical R&D, where reproducible solvent removal from multi-analyte QuEChERS extracts is critical
• Forensic toxicology labs performing confirmation testing per SWGTOX guidelines, where minimal analyte loss and cross-contamination prevention are mandatory
• Pharmaceutical QC laboratories conducting forced degradation studies requiring precise thermal control during stability-indicating method development

FAQ

What is the maximum recommended operating temperature for the water bath?
The HSC-24A is rated for continuous operation up to 99.9 °C; however, sustained use above 85 °C requires periodic water level monitoring and demineralized water to prevent scaling.
Can the instrument be used with corrosive solvents such as concentrated HCl or TFA?
No—while 316 stainless steel offers broad chemical resistance, prolonged exposure to halogenated acids or strong oxidizers may compromise needle integrity and bath liner longevity; use only with standard organic solvents and aqueous buffers.
Is tube height adjustment motorized or manual?
Height adjustment of the gas manifold is fully manual via calibrated rack-and-pinion mechanism, allowing sub-millimeter positioning repeatability without reliance on electronic actuators.
Does the unit include calibration documentation?
Yes—each shipment includes a factory calibration report for temperature sensor (NIST-traceable), along with instructions for user-performed verification using a Class A thermometer per ISO/IEC 17025 Clause 6.5.
Are replacement parts such as heating elements or gas needles available separately?
Yes—Chu Ding provides certified spare kits including 316 SS needle assemblies, silicone O-rings, bath heater modules, and PID controller boards, all with documented shelf-life and RoHS compliance statements.