N-EVAP Parts and Accessories List

N-EVAP Parts and Accessories — Summary and Practical Guide

Significance of the topic

The N-EVAP evaporator platform is widely used in analytical laboratories for solvent evaporation and sample concentration. Correct selection and maintenance of consumables and spare parts (needles, fittings, valve tubes, gas supply components, bath media and sample holders) is essential to preserve performance, maintain reproducibility, ensure operator safety and extend equipment lifetime. Acid-resistant alternatives and correct gas/flow regulation are particularly important when working with corrosive solvents or aggressive matrices.

Objectives and overview

This document summarizes a parts-and-accessories list for N-EVAP systems, describing available consumables, their intended use, packaging or ordering units, and key compatibility notes. It aims to give laboratory managers and technicians a compact reference to identify required items, understand variants for corrosive media, and plan spare-part inventories.

Used Instrumentation and major components

Key items listed for N-EVAP systems include:

• Needles: Stainless steel needles (4 in × 19 gauge) with either brass-plated hub, plastic hub, or FEP coating for corrosive solvents. Sold in sets (commonly 12 or 50).
• Nitrogen supply: On-site nitrogen gas generator (20 LPM) capable of serving up to 48 sample positions; connector tube assemblies and coiled polyurethane gas supply tubing.
• Adapters and fittings: Pasteur pipette adapters with flow controllers (male luer to fluted nut or to 1/8 hose barb), nylon 3-part tube fittings, luer and washer (chrome-plated brass), swivel fittings for stainless steel gas supply tube, valve tube assemblies (chrome, with rear mount hose barb for units manufactured after 1997).
• Gas control and filtration: In-line paper air filters for N2 supply/Z-purge/air compressor; gas flow meters; pressure-reducing regulators specified for different flow ranges (0–10, 0–20, 0–30 LPM variants and corresponding psig ranges).
• Bath and heating accessories: Thermometers for water bath (100°C) and dry bath (150°C); aluminum beads for dry bath (3.5 L for N-EVAP 111, 5.5 L for N-EVAP 112); glass beads available for acid-resistant dry bath applications.
• Sample holders and mechanical parts: Multiple sample holder formats—12-position for small glassware (5–16 mm OD), 6-position for larger glassware (30–56 mm OD, compatible with N-EVAP 111), and 8-position for large glassware (30–70 mm OD, compatible with N-EVAP 112). Additional mechanical spares include hoist pulleys, band springs (size confirmation recommended before ordering), and thumb screws.

Methodology and organization of the parts list

The catalog is organized by functional group (needles, gas supply and control, fittings, bath media, sample holders, mechanical spares). For each item the list provides a short description, the part number (where applicable), packaging quantity (sets of 12 or 50, or sold individually), and compatibility notes (e.g., N-EVAP model compatibility or manufacturing date constraints). Users are advised to contact the supplier for part numbers of acid-resistant units and to confirm spring sizes and other dimension-sensitive components prior to ordering.

Main findings and discussion

From the parts list the most important practical points are:

• Consumables packaging: Needles and small adapters are predominantly sold in sets (12 or 50), which affects inventory practices and per-sample cost planning.
• Corrosion resistance: FEP-coated needles and glass-bead dry baths are provided as options tailored for corrosive solvents; explicit acid-resistant variants require direct contact with the vendor for correct part numbers.
• Compatibility constraints: Some assemblies (e.g., valve tube chrome assembly) are specified for units made after a certain year (post-1997), so serial number/manufacture-date verification is necessary when replacing parts.
• Gas handling: A 20 LPM nitrogen generator can serve many positions (up to 48), but appropriate flow regulation and filtration plus pressure-reducing regulators must be selected to match the laboratory configuration and desired per-position flow rates.
• Thermal media: Choice between aluminum beads (standard) and glass beads (acid-resistant) allows adaptation of the dry bath to solvent and chemical compatibility requirements.

Benefits and practical applications

Maintaining a correct stock of the listed parts provides multiple laboratory advantages:

• Reduced downtime: Readily available needles, valve tubes and fittings reduce process interruptions due to worn or clogged components.
• Safety and sample integrity: Acid-resistant consumables reduce corrosion risk, contamination and potential failure when evaporating strongly acidic or halogenated solvents.
• Reproducibility: Appropriate gas flow regulation and properly matched sample holders ensure even evaporation across sample sets and improve analytical precision.
• Cost control: Understanding packaging units and replacement intervals helps budgeting for consumables and spare parts.

Future trends and potential applications

Expected developments and opportunities related to N-EVAP consumables and accessories include:

• Wider adoption of fully acid-resistant materials for critical wet-contact parts to support more aggressive chemistries without vendor customization.
• Integration of smart gas generators and flow controllers with digital monitoring and alarms to optimize gas usage and detect leaks or flow deviations.
• Single-use or easily replaceable needle/tube modules to minimize cross-contamination risks in regulated laboratories.
• Improved ergonomic and modular sample holders to increase throughput and simplify conversion between glassware sizes.
• Sustainability improvements such as recyclable packaging, longer-life consumables, and more energy-efficient gas generation systems.

Conclusion

The N-EVAP parts and accessories list provides a practical inventory of consumables and spare parts necessary for maintaining evaporator performance and adapting the system to specific solvent and sample requirements. Key considerations when procuring parts are corrosion resistance, compatibility with N-EVAP model and manufacture date, packaging quantities, and appropriate gas flow/pressure regulation. Proactive inventory management and selection of acid-resistant options when needed will enhance safety, reliability and analytical consistency.

References

• Manufacturer parts and accessories list (source document summarised).