Automatic 20TM Nitrogen Evaporation System Models 11220-A Instruction Manual

Importance of the Topic

The Automatic 20™ Nitrogen Evaporation System addresses a fundamental need in analytical chemistry: efficient concentration of multiple samples in parallel. By combining precise temperature control with regulated inert gas flow, laboratories can accelerate sample preparation, improve reproducibility, and reduce solvent usage while safeguarding sensitive analytes.

Study Objectives and Overview

This summary reviews the design, installation, operation, and safety features of the Model 11220-A Automatic 20™ system. Key goals include:

• Enabling simultaneous evaporation of up to 20 samples.
• Implementing digital time and temperature control for both manual and automated endpoints.
• Ensuring safe handling of volatile and flammable solvents via an optional positive-pressure purge.

Methodology and Instrumentation

The system employs a heated water bath (1100 W, up to 100 °C) coupled with nitrogen gas distribution through a flow meter and individual needle valves. A hydraulic lift positions sample holders precisely, while SS needles or pipette adapters introduce gas into tubes ranging from 10 ml to 60 ml. The digital controller interfaces with a timer and dual solenoid valves to sequence heat and gas services according to programmed delays or durations.

Instrumentation Used

• B1302-R OA-HEAT Water Bath (1100 W)
• Flow Meter (0–25 L/min, model V12651)
• Hydraulic Cylinder and Support Tray for sample positioning
• Valve Tube Assemblies (model P0627) with stainless steel needles (19 ga x 4")
• Digital Temperature Controller and Timer Module
• Optional Type-Z Positive Pressure Purge Assembly

Key Findings and Discussion

Operational testing demonstrates consistent evaporation rates across all 20 positions when gas flow and bath temperature are standardized. The digital timer allows unattended runs for preheating, endpoint control, and automatic shutdown of heat or gas. The Type-Z purge reduces ignition risk with flammable solvents by maintaining a slight positive pressure within the bath enclosure.

Practical Benefits and Applications

• High throughput: Processes 20 samples simultaneously, reducing hands-on time.
• Flexibility: Supports various tube formats and sample volumes up to 60 ml.
• Enhanced safety: Optional inert gas purge and PTFE coatings protect against corrosion and fire hazards.
• Reproducibility: Digital controls and flow metering deliver uniform results for QA/QC, environmental analysis, and pharmaceutical testing.

Future Trends and Opportunities

Advancements may include integrated gravimetric endpoint detection, remote monitoring via laboratory information systems, and automated solvent recycling. Miniaturized or modular designs could further increase throughput, while machine-learning algorithms optimize evaporation profiles for new solvent matrices.

Conclusion

The Automatic 20™ system combines robust engineering, precise digital control, and safety features to streamline sample concentration workflows. Its scalable design and optional purge capability make it a versatile tool for modern analytical laboratories seeking efficiency, consistency, and compliance.