DS 202 Rotary Vane Pump

Significance of the topic

The DS 202 dual-stage oil-sealed rotary vane pump is a common laboratory and light-industrial roughing pump used to establish and maintain low-vacuum conditions ahead of high-vacuum stages or vacuum-processed equipment. Understanding its performance envelope, gas/water vapor handling, operational features and serviceability is essential for selecting an appropriate foreline pump in applications such as mass spectrometry, vacuum drying, rotary evaporators, freeze drying, and general laboratory vacuum systems.

Objectives and study overview

This summary translates the DS 202 product data sheet into a concise technical overview focusing on key specifications, functional features, practical implications for users, maintenance options and ordering/accessory information. The goal is to provide an accessible reference for vacuum system designers, laboratory managers and technicians evaluating or maintaining this pump model.

Methodology and instrumentation

The DS 202 is described as an integrated product: a dual-stage oil-sealed rotary vane pump with a built-in single-phase universal-voltage motor and integral power switch. Primary functional elements and accessories called out in the data sheet include:

• Inlet isolation (antibackstream) valve: closes automatically on power interruption to retain rough vacuum and prevent oil backstream into the vacuum chamber.
• Manual gas ballast valve: allows controlled admission of atmospheric gas to improve water vapor handling when required.
• DN25 ISO-KF inlet and exhaust flanges for standard vacuum line connections.
• Optional oil mist eliminator, replacement cartridges, oil return kit and exhaust filters for emissions control and oil management.

Instrumentation data are presented per PNEUROP 6602 standards for pumping speed measurement.

Main results and discussion

Key performance specifications and operational characteristics extracted from the data sheet:

• Pumping speed: 8.3 m3/h at 50 Hz (160 L/min) and 5.8 cfm at 60 Hz (192 L/min at 60 Hz quoted differently in some places — the standardized PNEUROP values are indicated on the sheet).
• Ultimate pressures: total pressure <2 × 10⁻3 mbar; ultimate partial pressure 10⁻4 mbar. With gas ballast opened, ultimate total pressure degrades to ~2 × 10⁻2 mbar.
• Water handling: rated tolerance up to 15 mbar and a water vapor capacity of 100 g/h when gas ballast is used appropriately.
• Motor and mechanical: single-phase motor rated 0.72 kW at both 50 and 60 Hz, nominal speeds ~1,500 rpm (50 Hz) and 1,800 rpm (60 Hz). Weight ~25 kg.
• Oil system: minimum/maximum oil capacity 0.25–0.6 L; recommended rotary vane pump fluid (AVF Silver, formerly DS19 type) sold in 1 L and 1 US gallon containers depending on region.
• Noise and usability: data sheet notes low sound pressure and global motor voltage compatibility (100–120/200–230 V ±10%, 50/60 Hz) with CE and UL/CSA compliance.

Performance curve summary: the pumping speed curve (per the sheet) shows the typical decline in effective pumping speed at lower pressures; the pump is intended primarily for the roughing range and initial pumpdown to low 10⁻3 mbar levels but not for high-vacuum final stages without backing turbomolecular or diffusion pumps.

Practical operational considerations:

• The inlet isolation valve protects the vacuum chamber and retains vacuum in the foreline when the pump is turned off—useful for short power interruptions or routine shutdowns.
• Manual gas ballast improves water vapor capacity but increases ultimate pressure; it should be used when processing moist gases to avoid oil contamination and pump flooding.
• Oil selection and maintenance intervals (minor and major kits) are critical to sustain performance and avoid vane wear or contamination.

Benefits and practical applications of the method

Benefits of the DS 202 design and features:

• Compact, relatively lightweight and energy-matched motor for bench and small-system installations.
• Universal-voltage single-phase motor simplifies global deployment without special transformers.
• Integrated inlet isolation valve reduces risk of oil backstream and preserves system vacuum during shutdowns.
• Serviceability: availability of minor and major maintenance kits and spare cartridges simplifies preventive maintenance and reduces downtime.

Typical application areas:

• Foreline pump for turbomolecular or cryogenic pumps.
• Laboratory vacuum lines, rotary evaporators, manifold systems and sample prep instruments.
• Analytical instrumentation such as GC/MS or small vacuum dryers where low 10⁻3 mbar range is sufficient.

Future trends and potential applications

Emerging trends relevant to pumps of this class include:

• Shift toward oil-free or dry pumping technologies for contamination-sensitive applications; oil-sealed pumps remain competitive where cost and simplicity matter.
• Integration of electronic monitoring (temperature, vibration, oil condition sensors) and predictive maintenance capabilities to reduce unscheduled downtime.
• Development of lower-emission oils and more efficient exhaust filtration to meet tighter environmental and workplace safety standards.
• Modular accessory ecosystems (electronic valves, remote power/interlock) to simplify integration into automated vacuum systems.

Potential new uses include compact vacuum systems for benchtop manufacturing, lab automation and hybrid systems combining dry and oil-sealed stages to balance performance and cleanliness.

Conclusion

The DS 202 is a practical, serviceable dual-stage rotary vane roughing pump designed for a broad set of laboratory and light-industrial applications. It delivers reliable rough vacuum performance (to the low 10⁻3 mbar region), has features that reduce oil backstream risk and offers water vapor handling via a gas ballast. Its compact design, universal motor voltage and available maintenance kits and accessories make it a versatile choice where moderate vacuum and cost-effectiveness are priorities. Users should weigh the limitations inherent to oil-sealed technology (potential contamination, maintenance needs, water tolerance limits) against their application requirements and consider oil-free alternatives where necessary.

Reference

Agilent Technologies. DS 202 Dual-Stage Rotary Vane Pump — Data Sheet (part number 9499320). Document ID 5994-3541EN. Product specification highlights: pumping speed 8.3 m3/h (50 Hz), ultimate total pressure <2 × 10⁻3 mbar, water vapor capacity 100 g/h, oil capacity 0.25–0.6 L. Maintenance and accessory items: minor kit 9499370, major kit 9499381, AVF Silver pump fluid 9499390 (region-specific codes K7516301/ K7516302 for USA), oil mist eliminator 9499395 and associated cartridges and filters as listed on the data sheet.