A rare pre-owned stainless steel UVH Leybold-Heraeus 85419 Liquid Nitrogen (LN2) Cryo Trap with (2) KF40 Flanges and acts as a Vacuum-Jacketed Dewar/chamber. Minor blemishes commensurate with age , KF40 flanges have hard to see micro-scratches but these do not impact vacuum integrity. Refurbished and fully functional.
This is a high-performance, industrial-grade Leybold 85419 Adsorption/Cryo Trap designed for high-vacuum applications. Unlike standard single-walled traps, this premium unit features a vacuum-jacketed (Dewar-style) reservoir,
providing superior thermal insulation for liquid nitrogen (LN2) use.
This design is critical for achieving deep vacuums (down to 10-8 mbar) by
effectively freezing out water vapor and preventing oil backstreaming.
From Google AI
Summary points
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| Manufacturer | Leybold-Heraeus (Germany) |
| Model | 85419 |
| Flange Size | KF40 (DN40 ISO-KF) |
| Trap Type | LN2 Cryo / Adsorption (All-Metal) |
| Reservoir Vol. | ~3.0 Liters |
| Hold Time | 8–12 Hours (Load Dependent) |
| Construction | 304L Stainless Steel (0.125" heavy-wall base) - Ultra-clean interior finish for minimal outgassing |
| Included | Body, Reservoir/Lid, Toggle Clamp, New Viton O-ring |
Cooling Surface: Integrated high-conductance cold-well design
Reservoir Dimensions: approximately 7.5" Diameter x 4" Depth
Throughput & Conductance
- High Conductance: KF40 flanges have an internal diameter of approximately 1.5 inches (40mm). This provides significantly higher conductance than the smaller KF16 or KF25 standards.
- Pumping Speed: This trap is designed to handle "medium to high" pumping speeds. It is typically matched with pumps having a displacement of 15 to 60 CFM (25 to 100 m3/hr)
- System Integrity: Because cryo-trapping is often used to reach "High Vacuum" 106
– 107, the KF40 flanges ensures the trap itself doesn't become a "bottleneck" that slows down the evacuation of the main chamber.
Compatible Industrial Pumps
This unit is the "standard" companion for mid-to-large-scale industrial vacuum pumps, specifically:
- Rotary Vane Pumps: It is perfectly sized for the Leybold Trivac D30, D40, or D65 series.
- Dry Scroll Pumps: Often used with larger scroll pumps (like the Edwards XDS35 or Agilent IDP-15) where oil-free operation is critical, but water vapor still needs to be "frozen out."
- Roots Blower Systems: It can be used on the "foreline" of smaller Roots blower stacks to protect the primary pump from harsh condensables.
Typical Industrial Applications
- Semiconductor Manufacturing: To trap process gases or pump oil vapors.
- Vacuum Distillation/Freeze Drying: Where high volumes of water vapor or solvents need to be captured rapidly.
- Space Simulation: Small-to-medium thermal vacuum chambers (TVACs).