VACUUBRAND RZ 2.5 Two-Stage Rotary Vane Vacuum Pump – Brand New
The VACUUBRAND RZ 2.5 Two-Stage Rotary Vane Vacuum Pump is a compact high-vacuum laboratory pump designed for applications requiring deep ultimate vacuum in a smaller, lighter package than larger rotary vane systems. Delivering an ultimate vacuum of 2 × 10⁻³ mbar (1.5 × 10⁻³ Torr) and maximum pumping speed of 1.65 cfm at 60 Hz, the RZ 2.5 provides reliable vacuum performance for freeze drying, Schlenk-line chemistry, vacuum ovens, fine-vacuum distillation, degassing, and other demanding laboratory processes.
This brand-new VACUUBRAND RZ 2.5 rotary vane pump is available from American Instrument Exchange and combines deep two-stage vacuum performance with a compact footprint, low operating noise, integrated gas ballast, large oil capacity, and straightforward maintenance. For laboratories that need fine-vacuum capability but do not require the higher pumping speed of an RZ 6, the RZ 2.5 offers an excellent balance of performance, size, and operating cost.
VACUUBRAND RZ 2.5 Rotary Vane Vacuum Pump Key Features
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Brand-new VACUUBRAND RZ 2.5 rotary vane vacuum pump
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Two-stage oil-sealed rotary vane design
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Ultimate vacuum of 2 × 10⁻³ mbar / 1.5 × 10⁻³ Torr
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Maximum pumping speed of 1.65 cfm at 60 Hz
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2.3 m³/h maximum pumping speed at 50 Hz
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Ultimate partial vacuum down to 4 × 10⁻⁴ mbar
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Integrated gas ballast
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Excellent ultimate vacuum even with gas ballast
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Vacuum-tight at switch-off
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No external anti-suckback valve required
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Large oil reservoir for longer intervals between oil changes
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Compact footprint and relatively low weight
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Quiet operation at approximately 48 dBA
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Telescopic design simplifies maintenance
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KF DN 16 inlet connection
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NRTL certified on U.S. configuration
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Supplied oil-filled and ready for use
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Available brand new from American Instrument Exchange
VACUUBRAND RZ 2.5 Two-Stage Rotary Vane Pump Overview
The VACUUBRAND RZ 2.5 is engineered for laboratories that require fine-vacuum performance but do not need the gas throughput of a larger rotary vane pump. Its two-stage pumping architecture allows it to reach substantially lower pressures than single-stage rotary vane pumps and general-purpose diaphragm pumps while keeping overall size, weight, and power consumption relatively low.
At 60 Hz, the RZ 2.5 provides up to 1.65 cfm of pumping speed, making it well suited for small to medium vacuum chambers, laboratory freeze dryers, Schlenk lines, vacuum ovens, and other applications where deep vacuum is more important than very high volumetric throughput.
The pump maintains strong pumping performance even as system pressure approaches ultimate vacuum. VACUUBRAND also designs the RZ 2.5 to remain vacuum-tight when switched off, eliminating the need for an external anti-suckback valve in many installations.
Its compact dimensions and approximately 32-pound weight make the RZ 2.5 particularly attractive for laboratories with limited bench or equipment space.
VACUUBRAND RZ 2.5 Rotary Vane Vacuum Pump Key Specifications
| Specification |
Details |
| Manufacturer |
VACUUBRAND |
| Model |
RZ 2.5 |
| Equipment Type |
Two-Stage Rotary Vane Vacuum Pump |
| Pump Design |
Oil-Sealed Rotary Vane |
| Number of Stages |
2 |
| Maximum Pumping Speed at 60 Hz |
1.65 cfm |
| Maximum Pumping Speed at 50 Hz |
2.3 m³/h |
| Ultimate Vacuum |
2 × 10⁻³ mbar / 1.5 × 10⁻³ Torr |
| Ultimate Vacuum with Gas Ballast |
1 × 10⁻² mbar / 7.5 × 10⁻³ Torr |
| Ultimate Partial Vacuum without Gas Ballast |
4 × 10⁻⁴ mbar / 3 × 10⁻⁴ Torr |
| Maximum Back Pressure |
1.1 bar absolute |
| Oil Capacity |
0.36–0.84 L |
| Recommended Oil |
VACUUBRAND B-Oil |
| Inlet Connection |
KF DN 16 / DN 10 mm Hose Nozzle |
| Outlet Connection |
Hose Nozzle DN 8–10 mm |
| Rated Motor Power |
0.10 kW / 100 W |
| Motor Speed |
1500 rpm at 50 Hz / 1800 rpm at 60 Hz |
| Operating Ambient Temperature |
12°C to 40°C |
| Storage Temperature |
-10°C to 60°C |
| Dimensions (L × W × H) |
390 × 156 × 240 mm (15.4 × 6.1 × 9.4 in.) |
| Weight |
14.7 kg (32.4 lb) |
| Sound Pressure Level |
Approximately 48 dBA
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| Protection Class |
IP40 |
| Electrical Requirements |
100–115 VAC, 50/60 Hz or 120 VAC, 60 Hz U.S. configuration |
| Certification |
NRTL Certified on applicable configuration |
| Condition |
Brand New |
Energy Efficiency & Operating Costs
The VACUUBRAND RZ 2.5 uses a relatively modest 100-watt motor while achieving high-vacuum performance down to 2 × 10⁻³ mbar. For laboratories that do not require the higher pumping speed of a larger rotary vane pump, this smaller motor and lower oil volume can help reduce operating costs while still providing the vacuum needed for demanding laboratory applications.
The pump's relatively large oil reservoir for its size helps extend service intervals, while the telescopic housing design simplifies maintenance access. Routine operating costs primarily involve electricity, vacuum pump oil, and periodic service components.
Oil life depends heavily on the vapors entering the pump. Appropriate use of cold traps, inlet separators, gas ballast, and exhaust filtration can help protect the pump, extend oil life, and reduce maintenance requirements.
Specifications compiled from VACUUBRAND manufacturer literature and American Instrument Exchange product information.
Common Applications
The VACUUBRAND RZ 2.5 is commonly used for freeze drying, lyophilization, Schlenk-line chemistry, vacuum ovens, fine-vacuum distillation, high-vacuum degassing, vacuum manifolds, evacuation of laboratory apparatus, and other fine-vacuum laboratory processes.
Its compact size makes it particularly attractive for benchtop or smaller laboratory systems where a larger rotary vane pump would provide unnecessary pumping capacity or consume excessive space.
Ideal Laboratory Types
The VACUUBRAND RZ 2.5 is well suited for university chemistry laboratories, pharmaceutical research groups, biotechnology companies, materials science laboratories, analytical facilities, pilot laboratories, organic synthesis groups, contract research organizations, and industrial R&D departments.
Laboratories operating small freeze dryers, Schlenk lines, vacuum ovens, laboratory vacuum manifolds, and fine-vacuum experimental apparatus frequently benefit from the RZ 2.5's combination of compact size and deep ultimate vacuum.
High Vacuum Performance
The primary advantage of the RZ 2.5 is its ability to reach 2 × 10⁻³ mbar while remaining substantially smaller than many high-vacuum rotary vane pumps.
Its two-stage design compresses gas through two successive pumping stages, allowing the pump to achieve much lower ultimate pressure than a single-stage pump.
VACUUBRAND specifies an ultimate partial vacuum of 4 × 10⁻⁴ mbar without gas ballast, making the RZ 2.5 suitable for applications where deep fine vacuum and low residual gas pressure are required.
Because pumping speed remains useful as pressure decreases, the RZ 2.5 can efficiently transition laboratory equipment from atmospheric pressure into the fine-vacuum range.
Gas Ballast & Condensable Vapor Handling
The RZ 2.5 includes an integrated gas ballast to improve operation when condensable vapors are present.
Opening the gas ballast introduces a controlled quantity of gas during compression, helping reduce condensation of water vapor and suitable solvents inside the pump oil. This can be especially useful during the early stages of vacuum drying, lyophilization, or solvent-processing applications.
With gas ballast open, the RZ 2.5 reaches an ultimate vacuum of approximately 1 × 10⁻² mbar. With gas ballast closed, ultimate vacuum improves to approximately 2 × 10⁻³ mbar.
Operators can therefore use gas ballast during higher-vapor portions of a process and close it when maximum ultimate vacuum is required.
RZ 2.5 for Freeze Drying and Lyophilization
The RZ 2.5 is well suited for many small laboratory freeze dryers and benchtop lyophilizers that require deep vacuum but relatively modest pumping capacity.
Freeze drying requires pressures low enough to support sublimation of frozen water. The RZ 2.5's two-stage rotary vane design provides substantially deeper vacuum than typical diaphragm pumps while remaining compact enough for laboratories with limited equipment space.
Actual compatibility depends on freeze dryer chamber volume, condenser capacity, vapor load, target pressure, and the manufacturer's recommended pump specifications. Users should verify the vacuum and pumping-speed requirements of their specific freeze dryer before selecting a pump.
RZ 2.5 for Schlenk-Line Chemistry
The RZ 2.5 is also an excellent vacuum source for Schlenk-line and air-sensitive chemistry applications.
Its 2 × 10⁻³ mbar ultimate pressure allows laboratories to evacuate reaction vessels, manifolds, and glassware to pressures significantly below those achievable with routine diaphragm pumps. This makes it useful for purge-and-refill cycles, drying glassware under vacuum, and other techniques used in organometallic and synthetic chemistry.
Chemical compatibility should always be considered. Aggressive or condensable solvent vapors should be appropriately trapped before they enter the oil-sealed pump.
RZ 2.5 for Vacuum Ovens and Drying Chambers
Vacuum ovens and drying chambers can benefit from the RZ 2.5 when deep vacuum is required but chamber volume is relatively modest.
Reducing pressure lowers the boiling point of water and many solvents, enabling drying at reduced temperatures. The compact RZ 2.5 provides sufficient high-vacuum performance for many laboratory-scale drying systems without the footprint or higher pumping capacity of a larger RZ 6.
Cold traps or inlet separators may be advisable when significant solvent or water vapor is expected.
RZ 2.5 vs. RZ 6 – Which VACUUBRAND Rotary Vane Pump Should You Choose?
Both the RZ 2.5 and RZ 6 reach approximately the same ultimate vacuum of 2 × 10⁻³ mbar, but their pumping speeds differ substantially.
The RZ 2.5 provides approximately 1.65 cfm at 60 Hz, making it well suited for smaller freeze dryers, Schlenk lines, vacuum ovens, and compact laboratory vacuum systems.
The RZ 6 provides approximately 4.0 cfm at 60 Hz, making it better suited for larger chambers, higher gas loads, larger freeze dryers, or applications requiring faster evacuation.
For laboratories primarily concerned with deep vacuum rather than high gas throughput, the smaller RZ 2.5 can provide essentially the same ultimate pressure with lower power consumption, smaller footprint, and lower weight.
RZ 2.5 vs. ME 1 and ME 1C Diaphragm Pumps
The RZ 2.5 serves a very different role than VACUUBRAND ME-series diaphragm pumps.
The ME 1 is optimized for vacuum filtration and routine moderate-vacuum sample preparation.
The ME 1C adds greater chemical resistance for moderate-vacuum applications involving aggressive vapors.
The RZ 2.5 is a two-stage rotary vane pump capable of reaching pressures roughly five orders of magnitude lower than atmospheric pressure, making it suitable for freeze drying, Schlenk lines, vacuum ovens, fine vacuum distillation, and other deep-vacuum applications.
The tradeoff is that the RZ 2.5 uses vacuum oil and therefore requires routine oil monitoring and maintenance.
Recommended Laboratory Applications
The VACUUBRAND RZ 2.5 is recommended for:
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Small laboratory freeze dryers
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Benchtop lyophilizers
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Schlenk-line chemistry
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Vacuum ovens
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Vacuum drying chambers
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Fine-vacuum distillation
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High-vacuum degassing
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Vacuum manifolds
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Air-sensitive chemistry
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Evacuation of laboratory glassware
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Materials research
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Pharmaceutical process development
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General fine-vacuum laboratory applications
Pump selection should always consider required pumping speed, target pressure, chamber volume, solvent exposure, vapor load, and process safety.
Why Choose the RZ 2.5 for Compact High-Vacuum Systems?
Many laboratory processes require deep vacuum but do not generate enough gas load to justify a larger pump.
The RZ 2.5 addresses this need by delivering the same specified ultimate vacuum as larger VACUUBRAND RZ-series models in a smaller and lighter package. At approximately 15.4 inches long and 32.4 pounds, it can be positioned beneath or beside many laboratory instruments without requiring the floor space of larger vacuum systems.
Its approximately 48 dBA sound pressure level also makes it relatively quiet for an oil-sealed two-stage rotary vane pump.
Brand-New VACUUBRAND Vacuum Pumps from American Instrument Exchange
American Instrument Exchange offers the VACUUBRAND RZ 2.5 brand new, providing laboratories with access to current VACUUBRAND two-stage rotary vane technology from an established laboratory equipment supplier.
American Instrument Exchange also offers additional new VACUUBRAND vacuum pumps, including the ME 1 general-purpose diaphragm pump, ME 1C chemistry diaphragm pump, RZ 6 high-capacity rotary vane pump, and RC 6 Chemistry-HYBRID pump.
This range allows laboratories to select vacuum technology based on their actual application requirements—from routine filtration and moderate vacuum to compact fine vacuum, higher-capacity deep vacuum, and chemically demanding high-vacuum processes.
Shipping and Installation Considerations
The VACUUBRAND RZ 2.5 is supplied oil-filled, fully assembled, and ready for operation. The pump should be installed on a stable, level surface with adequate airflow for motor cooling and sufficient access for routine oil inspection and maintenance.
The U.S. configuration supports 100–115 VAC at 50/60 Hz and 120 VAC at 60 Hz. Buyers should verify the exact nameplate voltage of the pump before installation.
The vacuum inlet uses a KF DN 16 small-flange connection with compatibility for a DN 10 mm hose nozzle. High-quality vacuum tubing with adequate conductance should be used to prevent unnecessary loss of pumping speed.
For processes involving condensable vapors, corrosive gases, solvents, or particulates, laboratories should evaluate appropriate cold traps, separators, oil-mist filters, and exhaust-management accessories.
Related Laboratory Equipment
Laboratories purchasing compact two-stage rotary vane pumps often also require freeze dryers, vacuum ovens, Schlenk-line equipment, cold traps, rotary evaporators, vacuum manifolds, recirculating chillers, laboratory reactors, and chemical fume hoods. American Instrument Exchange offers new and refurbished laboratory equipment to support chemistry, pharmaceutical research, biotechnology, materials science, analytical laboratories, and industrial R&D applications.
VACUUBRAND RZ 2.5 Rotary Vane Vacuum Pump Frequently Asked Questions
What is the ultimate vacuum of the VACUUBRAND RZ 2.5?
The RZ 2.5 reaches an ultimate vacuum of 2 × 10⁻³ mbar, or approximately 1.5 × 10⁻³ Torr, with the gas ballast closed.
What is the pumping speed of the RZ 2.5?
The RZ 2.5 provides a maximum pumping speed of approximately 1.65 cfm at 60 Hz or 2.3 m³/h at 50 Hz.
Is the VACUUBRAND RZ 2.5 a two-stage pump?
Yes. The RZ 2.5 is a two-stage oil-sealed rotary vane pump, allowing it to achieve substantially deeper vacuum than a single-stage rotary vane pump or laboratory diaphragm pump.
Can the RZ 2.5 be used with a freeze dryer?
Yes. The RZ 2.5 is well suited for many small laboratory freeze dryers and benchtop lyophilizers. Compatibility should be verified against the pumping-speed and ultimate-vacuum requirements of the specific freeze dryer.
Is the RZ 2.5 suitable for a Schlenk line?
Yes. Its deep ultimate vacuum and compact size make the RZ 2.5 an excellent choice for many Schlenk-line and air-sensitive chemistry applications.
Can the RZ 2.5 be used with a vacuum oven?
Yes. The RZ 2.5 is suitable for many laboratory vacuum ovens and drying chambers, particularly when chamber volume and vapor load are moderate.
What is the difference between the RZ 2.5 and RZ 6?
Both pumps reach approximately 2 × 10⁻³ mbar, but the RZ 6 provides substantially more pumping speed. The RZ 2.5 delivers approximately 1.65 cfm at 60 Hz, while the RZ 6 delivers approximately 4.0 cfm. The RZ 2.5 is therefore particularly attractive for smaller vacuum systems where high pumping capacity is unnecessary.
What does the gas ballast do?
The gas ballast helps reduce condensation of water vapor and other suitable condensable vapors inside the pump oil during compression. It is useful during vapor-intensive stages of drying and evacuation.
What vacuum does the RZ 2.5 reach with the gas ballast open?
VACUUBRAND specifies an ultimate vacuum of approximately 1 × 10⁻² mbar with the gas ballast open.
Does the RZ 2.5 require vacuum pump oil?
Yes. The RZ 2.5 is an oil-sealed rotary vane pump and requires VACUUBRAND B-Oil or an appropriate manufacturer-approved vacuum pump oil.
How much oil does the RZ 2.5 hold?
VACUUBRAND specifies an operating oil capacity between approximately 0.36 and 0.84 liters.
How loud is the VACUUBRAND RZ 2.5?
The RZ 2.5 has a specified sound pressure level of approximately 48 dBA, making it relatively quiet for a two-stage rotary vane vacuum pump.
How large is the RZ 2.5?
The pump measures approximately 15.4" L × 6.1" W × 9.4" H and weighs approximately 32.4 lb, making it considerably more compact than many high-vacuum laboratory pumps.
Does the RZ 2.5 require an anti-suckback valve?
VACUUBRAND specifies the RZ 2.5 as vacuum-tight when switched off, meaning an external anti-suckback valve is not normally required.
Is this VACUUBRAND RZ 2.5 refurbished or used?
No. This VACUUBRAND RZ 2.5 Two-Stage Rotary Vane Vacuum Pump is brand new, not refurbished or previously used, and is available from American Instrument Exchange with the applicable manufacturer's warranty.
