Pfeiffer

Duo 3 Vacuum

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The Pfeiffer Duo 3 Vacuum is an oil-sealed rotary vane vacuum pump. The Pfeiffer Duo 3 Vacuum is a two-stage pump for coarse and medium vacuum. The Pfeiffer Duo 3 Vacuum is available in standard, M, and MC variants.^[1]

PfeifferDuo 3 Vacuum

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Power

2.5 m3/h^[3]

Vacuum

Rotary vane pump^[2]

Gas delivery

Integrated gas ballast and safety valve^[3]

What it is

The Pfeiffer Duo 3 Vacuum Pump is a rotary vane vacuum pump. The Duo 3 belongs to the DuoLine vacuum pump family and is a standard-version pump in the DUO 3, DUO 3 M, and DUO 3 MC series.^[2]^[1]

How it works

The DUO 3 is an oil-sealed, two-stage rotary vane pump.^[3]

The DUO 3 family includes a gas ballast valve, and the pump can be operated with gas ballast or refilled with operating fluid during service.^[2]^[1]

Where it fits in the process flow

The DUO 3 is used as a vacuum pump in low and medium vacuum service.^[3]

The DUO 3 family sits on the pumping side of a vacuum system and provides the vacuum source for connected process hardware through vacuum and exhaust connections.^[2]

Applications

The DUO 3 is used for low and medium vacuum applications.^[3]

What do the numbers mean?

Power & electrical9

Pumping speed at 50 Hz: 2.5 m3/h^[3]
Pumping speed at 60 Hz: 2.9 m3/h^[3]
Rotation speed at 50 Hz: 3,000 rpm^[3]
Rotation speed at 60 Hz: 3,600 rpm^[3]
Emission sound pressure level without gas ballast at 50 Hz: 53 dB(A)^[3]
Mains requirement voltage 50 Hz: 230-240 V^[3]
Mains requirement voltage 60 Hz: 230-240 V^[3]
Rated power 50 Hz: 0.15 kW^[3]
Rated power 60 Hz: 0.18 kW^[3]

Vacuum & pumping9

Pump type: Rotary vane pump^[2]2 sources
Construction: Oil-sealed rotational displacement pump^[2]
Duo 3 MC differences: Operating fluid F4; magnetic coupling encapsulated on the pump side; vane material changed; hose connection on the gas ballast valve; leakage rate ≤ 1 × 10-8 Pa m3/s^[1]
Ultimate pressure with gas ballast: 3 × 10-3 hPa^[3]
Ultimate pressure without gas ballast: 3 × 10-3 hPa^[3]
Exhaust pressure, max.: 1,500 hPa^[3]
Pump construction: Oil-sealed^[1]
Application range: Coarse and medium vacuum^[1]
MC version changes: Operating fluid F4, magnetic coupling encapsulated on the pump side, changed vane material, hose connection on the gas ballast valve, leakage rate ≤ 1 × 10-8 Pa m3/s^[1]

Gas & chemistry1

Gas ballast / safety valve: Integrated gas ballast and safety valve^[3]

Dimensions & facilities2

Dimensions: 309 x 129 x 222 mm^[3]
Weight: 11.3 kg^[3]

Configuration & options15

Stage: Dual-stage^[3]
Variants: Duo 3 standard version, Duo 3 M, Duo 3 MC^[1]
Duo 3 M difference: Magnetic coupling^[1]
Cooling method: Air^[3]
Motor version: 1-ph motor^[3]
Ambient temperature: 12-40 °C^[3]
Recommended mains fuse capacity: 4 A^[3]
Operating fluid: P3^[3]
Operating fluid filling: 0.4 l^[3]
Leak rate safety valve: 1 × 10-5 Pa m3/s^[3]
Protection category: IP40^[3]
Manufacturer: Pfeiffer^[4]
Model: Duo 3^[4]
Stages: Two-stage^[1]
Variants stated: Standard version, M version, MC version^[1]

Vintage & configurations

Documented models & variants

Designation	Generation	Vintage	Changes	Source
Duo 3	—	—	Standard version	pfeiffervacuum.com^[1]
Duo 3 M	—	—	Differs from the standard version by magnetic coupling	pfeiffervacuum.com^[1]
Duo 3 MC	—	—	Differs from the standard version by operating fluid F4, magnetic coupling encapsulated on the pump side, changed vane material, hose connection on the gas ballast valve, and leakage rate ≤ 1 × 10-8 Pa m3/s	pfeiffervacuum.com^[1]

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Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.

Pump typeRotary vane pump^[2]
ConstructionOil-sealed rotational displacement pump^[2]
Duo 3 MC differencesOperating fluid F4; magnetic coupling encapsulated on the pump side; vane material changed; hose connection on the gas ballast valve; leakage rate ≤ 1 × 10-8 Pa m3/s^[1]
Gas ballast / safety valveIntegrated gas ballast and safety valve^[3]
Pumping speed at 50 Hz2.5 m3/h^[3]
Pumping speed at 60 Hz2.9 m3/h^[3]
Ultimate pressure with gas ballast3 × 10-3 hPa^[3]
Ultimate pressure without gas ballast3 × 10-3 hPa^[3]
Exhaust pressure, max.1,500 hPa^[3]
Rotation speed at 50 Hz3,000 rpm^[3]
Rotation speed at 60 Hz3,600 rpm^[3]
Emission sound pressure level without gas ballast at 50 Hz53 dB(A)^[3]
Mains requirement voltage 50 Hz230-240 V^[3]
Mains requirement voltage 60 Hz230-240 V^[3]
Rated power 50 Hz0.15 kW^[3]
Rated power 60 Hz0.18 kW^[3]
Pump constructionOil-sealed^[1]
Application rangeCoarse and medium vacuum^[1]
MC version changesOperating fluid F4, magnetic coupling encapsulated on the pump side, changed vane material, hose connection on the gas ballast valve, leakage rate ≤ 1 × 10-8 Pa m3/s^[1]

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Not publicly documented

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Frequently asked questions

What type of pump is the Duo 3?

The Duo 3 is a rotary vane vacuum pump.^[2]^[1]

How does the M version differ from the standard version?

The M version differs from the standard version by magnetic coupling.^[1]

How does the MC version differ from the standard version?

The MC version differs from the standard version by operating fluid F4, an encapsulated magnetic coupling on the pump side, changed vane material, a hose connection on the gas ballast valve, and a leakage rate of not more than 1 × 10-8 Pa m3/s.^[1]

Not publicly documented

The following facts about the Duo 3 Vacuum are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.

No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the Duo 3 Vacuum are on record.
Answerable by: OEM historical records or a trade-press announcement
The control-system platform and OS era of the Duo 3 Vacuum are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the Duo 3 Vacuum are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the Duo 3 Vacuum is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the Duo 3 Vacuum are on record.
Answerable by: an OEM parts catalog or a service engineer