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Core feedthroughs (fast reference)
| Purpose | Typical spec | Seal / Thread | Notes |
|---|---|---|---|
| Electrical power | IEC/Schuko; 110–240 V, 10–16 A | Hermetic ceramic; O-ring bulkhead | Use separate low-noise line for balances/sensors. |
| Signals / RF | BNC, SMA; DB-9/DB-25 | Hermetic glass-to-metal | Keep HV/RF away from solvent shelf; strain relief inside. |
| Vacuum line | KF16/KF25 (NW16/25) | KF clamp + Viton O-ring | For antechamber pump, gauges, traps. |
| Process gas | ¼” VCR / ¼” NPT/BSPP | Metal-seal (VCR) / tapered (NPT) | VCR for ultra-low leak & repeated service. |
| Cooling / liquids | ¼” compression (Swagelok) | O-ring bulkhead | Add drip leg; avoid top-entry over electronics. |
| Data / network | Ethernet, USB (pass-through) | Hermetic RJ45/USB or pigtail | Prefer panel pigtail to avoid connector wear. |
Sealing choices (how to pick)
- Elastomer O-ring bulkheads (Viton/EPDM)
- Pros: Flexible, easy to add/replace, low cost.
- Cons: Higher leak potential than hermetic; solvent/temperature limits.
- Hermetic glass/ceramic (glass-to-metal, alumina)
- Pros: Very low leak, high temp/solvent resistance, long life.
- Cons: Fixed spec, pricier; changes = new part.
Threads & seats:
- VCR/VCO for metal-to-metal seal (inert, repeatable).
- NPT needs correct sealant; avoid over-torque on plastic/acrylic panels.
- BSPP (G-thread) uses a gasket; mind compatibility.
Layout tips (clean flow, fewer headaches)
- Put vacuum & traps on the shortest route to the antechamber.
- Keep solvent-related lines low and away from power/data.
- Reserve a service rail (spare KF16 + blind caps) for future tools.
- Add ground studs/ESD bonding near electronics benches.
- Label inside & outside; keep spare caps/O-rings at the load-lock.
Leak & safety after install (2-minute SOP)
- Pressure-decay test at +5 mbar for 10–15 min; record ΔP.
- Wipe joints; check that no joints sit above open solvent.
- Verify ESD ground continuity for powered tools.
- Log part numbers, torque, and the test result.
Quote checklist (copy-paste to supplier)
- Application & gases (N₂/Ar + process gases):
- O₂/H₂O targets (ppm / °C dew point):
- Feedthrough list: qty × type × size × thread/seat (e.g., 2× KF25, 3× ¼” VCR, 1× IEC 16 A)
- Hermetic or O-ring? Temperature/solvent exposure?
- Panel thickness & material; preferred locations (left/right/back)
- Accessories: caps, blind flanges, traps, gauges, ESD studs
