The Nude Tube vacuum pressure sensor is a Bayard-Alpert style ionization vacuum sensor, which uses a fine wire collector located in the center of a grid. Because of its small area, few x-rays hit the collector, and a vacuum gauge can measure pressures to very low levels. Because the sensing portion of the tube is located within the vacuum system and experiences the system true pressure, nude tubes give a representative pressure measurement and respond more quickly than a glass envelope sensor to pressure changes.
Dual filaments reduce downtime
Lower chemical reaction rate and minimal thermal interference
Low internal outgassing rates at low pressures
Filaments resist damage caused by high oxygen partial pressures and accidental exposure to atmosphere