Used Vacuum Pumps›Pfeiffer›Other
Pfeiffer · Other
Pfeiffer TMH 261 — turbomolecular pump, 250 l/s
Original title: PFEIFFER VACUUM TMH 261-250-040 PM P03 626 & TC600 C 3326 181
📍 Germany
Suitability for 1 × FD440
Not verifiedItem type
Not confirmed
Technical
Cannot calculate
Condition
Not evidenced
Data
Family only
🔴 Check carefully
Turbomolecular pump unsuitable as primary vacuum source for WAVE freeze dryers.
Condition from photo
Exterior shows moderate dust and wear; heatsink fins intact; control electronics present; no visible oil leaks or damage.
Likely refurb / add-ons
- Backing pump (rotary vane, ~€200–400)
- Turbomolecular bearing service (€400–600)
- Control electronics refurbishment (€150–300)
Watch out for
- Turbomolecular pump requires a backing pump; WAVE freeze dryers use single-stage
- No backing pump visible in listing; TC600 controller alone cannot operate this p
- High-speed bearing wear cannot be assessed from exterior photos; internal condit
WAVE AI estimate from photo + specs only — not a substitute for our physical pre-purchase check.
Specifications
- Type
- other
- Source
- eBay
- Listing #
- eBay #326973006824
- Last verified
- Jul 27, 2026
The Other family is recognised, but the exact variant is not supported. Model-specific performance and water-vapour figures from Other Pfeiffer are therefore withheld.
Price history— Pfeiffer Other
Family: OtherExact model is not supported by the listing or type plate.
Median €1.110 · 903 cleaned observations · €374–€3.399
Type plate (AI reading)
- Exact model
- TMH 261-250-040 PM P03 626
- Pumping Speed
- 250 l/s
- Inlet Diameter
- DN 40 ISO-KF
- Backing Pressure
- < 0.1 mbar
- Ultimate Pressure
- < 1×10⁻⁶ mbar
Auto-extracted from one of the listing photos. Verify on the real unit before purchase.
What to look for on this family
Generic Pfeiffer vacuum pump — the exact model family was not detected automatically. Suitability remains unverified until the model or type plate is clear.
Traceable assessment
How each pump is assessed
AI helps read images and listing text. The final suitability result is calculated by a fixed engineering rule using evidenced values.
Method version: 5 August 2026
- 1
Identify the item
The title and photos are checked first to confirm that the listing is a complete vacuum pump — not an accessory, spare part or pump head only.
- 2
Establish evidence
The type plate and listing provide specific facts. Manufacturer values are used only for a confirmed model; family-level values stay clearly labelled.
- 3
Compare engineering data
Pumping speed, water-vapour capacity and ultimate pressure are compared with the selected WAVE machine and the chosen safety margins.
- 4
Assess condition separately
A photo or a seller saying “runs” does not replace a vacuum test. Unknown data remain unknown and never become an automatic green recommendation.