HengAo HSC-24BA Water Bath Nitrogen Evaporator

Overview

The HengAo HSC-24BA Water Bath Nitrogen Evaporator is an engineered solution for gentle, reproducible solvent removal and sample concentration in analytical laboratories. It operates on the principle of inert gas-assisted evaporation—introducing a controlled stream of nitrogen or other inert gas across the surface of liquid samples immersed in a precisely regulated water bath. This dual-control approach (temperature + gas flow) minimizes thermal degradation of thermolabile analytes while ensuring consistent evaporation kinetics across all 24 sample positions. Unlike dry-block evaporators, the water bath design delivers superior temperature homogeneity and buffering capacity, making it especially suitable for applications requiring strict thermal control—such as pesticide residue analysis, pharmaceutical impurity profiling, and clinical biofluid preparation where analyte integrity is critical.

Key Features

• Dual digital PID temperature controller with real-time display of setpoint and actual bath temperature; includes over-temperature alarm and automatic cut-off protection.
• Modular gas distribution manifold with individually adjustable stainless steel needle valves per channel—enabling independent flow control from 0 to 10 L/min for each sample position.
• Height-adjustable gas needle assembly mounted on precision linear guides; accommodates vessels ranging from 10 mL test tubes to 100 mL volumetric flasks without reconfiguration.
• Corrosion-resistant construction: All wetted parts—including needle holders, bath chamber, and sample support frame—are fabricated from ASTM A240 316 stainless steel, anodized aluminum alloy, or electrophoretically coated polymer surfaces.
• Variable-diameter water bath sample block with spring-loaded clamping mechanism—designed to secure tubes of 11–21 mm outer diameter without slippage or tipping during extended evaporation cycles.
• Integrated timer function (0–999 min) with audible end-of-cycle alert; supports unattended operation under defined thermal and gas-flow protocols.

Sample Compatibility & Compliance

The HSC-24BA accepts standard laboratory glassware including borosilicate test tubes, centrifuge tubes (up to 50 mL), volumetric flasks, and low-form beakers. Its open-bath architecture allows direct visual monitoring of sample volume reduction and facilitates manual intervention if required. The system complies with general laboratory safety standards for electrical appliances (IEC 61010-1) and meets material compatibility requirements outlined in USP for contact surfaces in sample preparation workflows. While not certified for GMP environments out-of-the-box, its traceable temperature control, stable gas delivery, and mechanical reproducibility support alignment with GLP documentation practices—including audit-ready calibration logs and operator-defined method parameters.

Software & Data Management

The HSC-24BA operates via embedded firmware without external PC dependency. All operational parameters—including target temperature, dwell time, and per-channel flow settings—are stored in non-volatile memory and recalled at power-up. Though no proprietary software suite is included, the instrument supports integration into LIMS or ELN systems through optional RS-232 or analog 4–20 mA output modules (available as accessories). For regulatory environments requiring electronic records, users may pair the unit with validated third-party data acquisition platforms that comply with FDA 21 CFR Part 11 requirements for electronic signatures and audit trails.

Applications

• Pesticide Residue Analysis: Concentration of extracts from QuEChERS-prepared matrices (fruits, vegetables, cereals) prior to GC-MS/MS or LC-MS/MS injection.
• Environmental Monitoring: Pre-concentration of trace-level PAHs, PCBs, and organochlorine compounds from aqueous environmental samples (drinking water, wastewater, groundwater).
• Pharmaceutical Quality Control: Solvent exchange and final concentration steps in dissolution testing, extractables/leachables studies, and herbal active ingredient isolation.
• Clinical & Forensic Toxicology: Preparation of plasma, serum, urine, and oral fluid specimens for targeted quantitation of drugs of abuse, doping agents, or metabolites.
• Food Safety Testing: Cleanup and concentration of mycotoxin, veterinary drug, or adulterant extracts from milk, beer, wine, and soft drink matrices.

FAQ

What is the maximum recommended operating temperature for continuous use?
The water bath is rated for sustained operation up to 100 °C; however, for optimal longevity of seals and thermal stability, routine use between 40–80 °C is recommended.
Can this unit be used with solvents other than water in the bath?
No—the HSC-24BA is designed exclusively for aqueous bath media. Use of organic solvents or oils may compromise gasket integrity and invalidate safety certifications.
Is calibration documentation provided with the instrument?
A factory calibration certificate verifying temperature accuracy (±1 °C at 50 °C and 80 °C) and flow linearity is supplied; users are responsible for periodic recalibration per internal SOPs or ISO/IEC 17025 requirements.
How does the spring-loaded tube holder accommodate different vessel heights?
The vertical travel of the gas needle assembly is mechanically linked to the sample rack; as vessel height increases, the entire needle array rises proportionally to maintain consistent gas-to-surface distance.
Does the unit include nitrogen gas supply or regulators?
No—nitrogen source, pressure regulator, and inline filter must be provided separately; inlet connection is standardized 1/8″ NPT female thread.