Description
Meta Description
Engineering breakdown of the Applied Materials 0190-48891 dual filament hot ionization vacuum gauge. Learn sensor parameters, degassing limits, and spares advice.
Main Body
When dealing with high-vacuum processing chambers in semiconductor fabrication, relying on an uncalibrated or failing ionization gauge can result in inaccurate recipe execution or undetected micro-leaks. The Applied Materials 0190-48891 is a dual-filament hot cathode ionization gauge assembly. Engineered for ultra-high vacuum (UHV) monitoring within AMAT process tools—such as HDP-CVD, Endura PVD, or Centura etch platforms—this component measures pressure by ionizing residual gas molecules via electron emission.
Technical Specifications Snapshot
| Parameter | Value |
| AMAT Part Number | 0190-48891 |
| Component Type | Hot Cathode Ionization Gauge (Bayard-Alpert Type) |
| Filament Configuration | Dual Filament (Yttria-coated Iridium or Tungsten) |
| Measurement Range | 10^{-3} to 10^{-10} Torr (Typical operational spectrum) |
| Operating Voltage | Variable via controller (Typically +180 V grid, +30 V collector bias) |
| Degas Method | Electron Bombardment (EB) or Resistive (I^{2}R) heating |
| Connection Flange | ConFlat (CF) metal-sealed or specialized ISO NW quick-release |
| Application Space | High-vacuum process chambers and load locks |
| Condition | New Original or Refurbished (tested & cleaned) |
By integrating a dual-filament configuration, this gauge maximizes tool uptime. If the primary filament burns out mid-process due to an accidental pressure spike or long-term depletion, the tool controller can switch operation directly to the secondary filament, preventing an immediate process scrap event.
Do you run aggressive halogen etch chemistries or deposition processes that cause heavy coating buildup? This hot ion gauge is not recommended for continuous exposure during active plasma processing steps without an isolation gate valve. Corrosive gases degrade the coated filaments rapidly, shifting the gauge sensitivity factor and causing severe measurement drift.
Well, technically, the 0190-48891 can read down into the low 10^{-10} Torr range, but accurate measurements require regular degassing cycles to strip adsorbed gas molecules off the internal grid structure. If you initiate electron bombardment degassing before the chamber drops below 10^{-5} Torr, you risk sputtering the grid materials and permanently shorting the collector pin.
For critical UHV lines, this gauge is a primary insurance spare. Maintaining a clean, sealed replacement unit on-site bypasses long lead times and ensures the chamber can be qualified swiftly following preventative maintenance turnarounds.
