VACUUBRAND RZ 2.5 Dual-Stage Oil-Sealed Rotary Vane Vacuum Pump

Overview

The VACUUBRAND RZ 2.5 is a compact, dual-stage oil-sealed rotary vane vacuum pump engineered for reliable and stable rough vacuum generation in laboratory and analytical applications. Operating on the principle of positive displacement via rotating vanes within an eccentrically mounted rotor chamber, the RZ 2.5 achieves high volumetric efficiency across a wide pressure range—from atmospheric down to 2 × 10⁻³ mbar (ultimate vacuum without gas ballast). Its dual-stage configuration enables deeper base pressures and improved compression ratios compared to single-stage equivalents, making it particularly suitable for applications requiring robust vapor handling and consistent vacuum integrity during extended operation. Designed and manufactured in Germany, the RZ 2.5 adheres to stringent DIN EN ISO 9001 quality standards and integrates mechanical engineering principles optimized for long-term reproducibility under variable load conditions.

Key Features

• Dual-stage oil-sealed rotary vane architecture delivering high pumping speed (2.3 m³/h at 50 Hz) and deep ultimate vacuum (2 × 10⁻³ mbar)
• Innovative integrated oil circulation system with large-volume oil reservoir (0.28 L max), extending service intervals and reducing maintenance frequency
• High-capacity gas ballast (vapor tolerance up to 40 mbar), enabling continuous operation in the presence of water vapor and common organic solvent vapors without oil degradation
• Automatic vacuum retention upon shutdown—no external anti-suckback valve required—maintaining system integrity during power interruption or process pauses
• “Telescope-style” modular housing design facilitating rapid access to internal components for inspection, cleaning, or vane replacement
• Standard KF DN 16 inlet flange and DN 10 mm elastomeric exhaust hose connection for seamless integration into vacuum manifolds and custom setups

Sample Compatibility & Compliance

The RZ 2.5 is compatible with a broad spectrum of vacuum-dependent laboratory processes—including rotary evaporation, freeze drying, vacuum filtration, degassing of solvents, and vacuum oven operation—where moderate vacuum levels and vapor resilience are critical. It is not intended for use with highly corrosive gases (e.g., Cl₂, NH₃, HF) or explosive atmospheres without additional safety certification. The pump meets CE marking requirements per EU Machinery Directive 2006/42/EC and Electromagnetic Compatibility Directive 2014/30/EU. While not intrinsically safe, its oil-sealed design complies with ISO 8573-1:2010 Class 4 for particulate and oil aerosol content in exhaust streams when equipped with optional FO oil mist filter and VS 16 valve kit. For GLP/GMP-regulated environments, the pump supports traceable maintenance logs and can be validated per ASTM D3924–22 (standard practice for vacuum system performance verification).

Software & Data Management

The RZ 2.5 operates as a standalone mechanical device with no embedded digital controller or communication interface. However, its operational stability and repeatable performance make it fully compatible with third-party vacuum monitoring systems (e.g., Pfeiffer TPG300 series, MKS Baratron gauges) and programmable logic controllers (PLCs) used in automated lab workflows. When integrated into vacuum networks managed by VACUUBRAND’s VacuGraph® software platform (via optional analog/digital I/O modules), users can log runtime hours, monitor oil temperature trends, and correlate pump status with process parameters for audit-ready documentation. All firmware and calibration records associated with connected instrumentation comply with FDA 21 CFR Part 11 requirements when deployed in regulated pharmaceutical or biotech laboratories.

Applications

• Routine rough vacuum supply for rotary evaporators (up to 5 L scale) and cold traps in solvent recovery systems
• Primary vacuum stage for high-vacuum systems using diffusion or turbomolecular pumps (e.g., as a backing pump for Pfeiffer HiPace or Edwards nXDS series)
• Vacuum-assisted sample preparation in environmental analysis (e.g., EPA Method 5035A for purge-and-trap VOC extraction)
• Controlled atmosphere processing in materials science labs, including vacuum impregnation and thin-film deposition pre-evacuation
• Quality control testing of packaging integrity (e.g., ASTM F2338–22 for vacuum decay leak testing)

FAQ

What is the recommended oil type and change interval for the RZ 2.5?
VACUUBRAND recommends using only original B-type pump oil (Order No. 698001). With typical lab usage (6–8 h/day, moderate vapor load), oil replacement is required every 6–12 months or after 2,000 operating hours—whichever occurs first.
Can the RZ 2.5 be operated continuously?
Yes—the pump is rated for continuous duty (S1 duty cycle) provided ambient temperature remains below 40 °C and adequate ventilation is ensured around the cooling fins.
Is the RZ 2.5 suitable for vacuum distillation of acidic or halogenated solvents?
No. Due to its oil-sealed design, exposure to aggressive vapors (e.g., HCl, bromoform, chlorosulfonic acid) may cause rapid oil breakdown and internal corrosion. For such applications, consider VACUUBRAND’s chemical-resistant diaphragm pumps (e.g., MD 4C NT) instead.
Does the RZ 2.5 include an oil mist filter?
Not by default. The FO oil mist filter (Order No. 698012) and VS 16 valve kit (Order No. 698016) are optional accessories designed to minimize oil aerosol emissions and enable controlled venting during shutdown.
How is vacuum integrity maintained after power loss?
An internal non-return valve automatically closes at shutdown, sealing the inlet port and preserving system vacuum for up to several hours—eliminating the need for external check valves in most configurations.