The 109030003 Inverted Magnetron Cold Cathode Vacuum Transducer features a 3.0 x 10-10 - 5.0 x 10-3 Torr vacuum measurement range, and a 1 inch OD tube fitting. Using the inverted magnetron design principle, the Series 903 can operate at pressures much lower than a traditional cold cathode sensor, as low as 10-10 Torr. A unique design feature to the 903 is a second feedthrough for ion collection, ensuring accurate reading results. Since the 903 has no filament, it is resistant to vibration damage and is unaffected by sudden inrushes of air. Its rugged design and ability to efficiently operate in harsh environments provide fast, dependable, and stable pressure measurement. The Standard 903 has one relay set point standard for process control that can be set to trip anywhere within its set point range. Set point activation status is shown with one of three LED indicators. Power and high voltage status are also indicated. The high voltage activation feature is a convenient way for you to shut off power to the 903 locally without shutting down your entire system. Deactivating the high voltage at pressures above 10-2 Torr reduces the effects of contamination in the sensor. Due to differing ionization potentials for different gases, the 903 is a simple solution for locating medium to fine leaks in vacuum systems. It complements a mass spectrometer leak detector, which is more efficient in finding smaller leaks.