Varian
VHS 250 Diffusion
Provisional entry — research in progress
This page was generated automatically from cited public sources and hasn't completed the full research pass yet. Every specification shown carries its source; more detail is added as research completes.
The Varian VHS 250 Diffusion Pump is a diffusion pump. The Varian VHS 250 requires 2200 watts of power at 240 volts. The Varian VHS 250 is part of a family of diffusion pumps that includes the VHS-4 and VHS-6.[1][2]
What it is
How it works
General reference — not yet source-verifiedDiffusion pumps operate by boiling a special low-vapor-pressure oil, which produces a jet of oil vapor directed downward through a nozzle assembly.
Gas molecules diffusing into the pump inlet are struck by the fast-moving oil vapor stream and are propelled toward the bottom of the pump, where they are compressed and exhausted by a mechanical backing pump.
Applications
General reference — not yet source-verifiedDiffusion pumps are employed in vacuum coating systems, including thermal evaporation and electron-beam deposition, to produce thin films on substrates.
What do the numbers mean?
What does it need to run?
Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.
Where are the manuals?
Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.
Not publicly documented
Field notes
No research found yet — worked with this tool? Share what you know.
Frequently asked questions
What is the electrical power requirement of the Varian VHS 250 diffusion pump?
The Varian VHS 250 diffusion pump requires 2200 watts at 240 V.[1]
Not publicly documented
The following facts about the VHS 250 Diffusion 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 VHS 250 Diffusion are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the VHS 250 Diffusion are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the VHS 250 Diffusion 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 VHS 250 Diffusion are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the VHS 250 Diffusion is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No research found yet — worked with this tool? Share what you know.
Sources & citations
Sources (2)Every fact above is drawn from these public sources
- [1]Inventory photo
- [2]https://www.idealvac.com/files/ManualsII/VHS-4-6-250a.pdf — idealvac.comidealvac.com
Last updated Sep 1, 2026.