Transducer suits high-vacuum applications.

Press Release Summary:



HPS® Series 909 Mini Ion Transducer integrates hot cathode sensor and electronics control package. Bayard-Alpert type transducer measures vacuum from l0-10 to 10-2 Torr. Electron bombardment degas function is pressure controlled, automatically stopping and restarting at preset pressures. Each unit has 2 yttria-coated iridium filaments and screen to shield grid and filaments from large particles. RS485 digital communications are standard.



Original Press Release:


MKS Releases New High Vacuum Transducer


BOULDER, COLORADO, December 20, 2002 -MKS Instruments, Inc. - HPS Products is introducing the HPS® Series 909 Mini Ion Transducer. The Series 909 is an integrated hot cathode sensor and electronics control package. The wide measurement range makes the HPS® Series 909 Mini Ion Transducer an ideal measurement tool for high vacuum applications, including pressure measurement of high vacuum chambers and control or start-up of high vacuum systems. The transducer includes a patent-pending degas function, digital communications, analog output and a setpoint.

The compact, Bayard-Alpert type Mini Ion Transducer will measure vacuum from l0-10 to 10-2 Torr. The electron bombardment degas function is pressure controlled (a patent pending feature), automatically stopping and restarting at preset pressures, allowing for automation of the degas function. Each 909 has two yttria-coated iridium filaments and a screen to shield the grid and filaments from large particles. Standard with the transducer is RS485 digital communications, allowing for adjustments and monitoring in real-time. For additional process control, the transducer includes semilogarithmic analog output and a relay set point.

The yttria-coated iridium filament is resistant to damage caused by high oxygen partial pressures and accidental exposure to atmosphere. The tube will operate accurately at lower temperatures, giving a lower chemical reaction rate and minimizing thermal interference. Hot cathode vacuum measurement is based on the ionization probability of a gas in a defined volume. HPS® hot cathode sensors are Bayard-Alpert style, which utilizes a fine wire collector located in the center of a grid. Because of its small area, few x-rays hit the collector, and the gauge can measure pressures to very low levels.

For more information contact MKS Instruments, Inc. - HPS Products at (800)345-1967 or (303)449-9861 or visit our web site with literature and drawings available for downloading at www.mksinst.com.

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