Operating Range 1 x 10-10 to 1 x 10-2 Torr X-Ray Limit Mounting Orientation Calibration Medium Overpressure Filament Type Emission Current Filament Potential Grid Potential Filament Heating Voltage Filament Heating Current Operating Temperature Storage Temperature Bakeout Temperature Degas Power Response Time Accuracy 1 x 10-9 to 1 x 10-2 Torr <1 x 10'10 Torr Any Dry air or nitrogen 150 PSI Dual Yttria Coated Iridium .01, .1, or 1 mA 30 V 180 V 1.5 V Typical (2.5 V Max) 1.5 A Typical (3 A Max) 0 °C to +50 °C -20 °C to +70 °C 200 °C 5 W Electron Beam (max) < 100 ms Description The 3F mini Bayard-Alpert hot cathode ionization gauge has a measurement range of 1 x 10-10 to 1 x 10-2 Torr. It indirectly measures absolute pressure by ionizing gas in the presence of an electric field. The design of this sensor allows for an extended range of measurement and bakeout temperatures up to 200° C. Physical Characteristics Electrical Connections Custom 9 Pin Connector Dimensions See dimensional drawings The 3F can be operated by several Televac controllers, including the MM200 or MC300 rack mountable controllers. The MM200 and MC300 controllers automatically operate the mini Bayard-Alpert to provide a full range vacuum measurement solution when the 3F is used in conjunction with rough vacuum sensors. Materials Exposed to Vacuum Stainless Steel Glass Kovar Tungsten Molybdenum Tantalum Alumina Ceramic Nickel Platinum Yttria Coated Iridium • Competitively priced • Compact design • Two filaments for longer lifetime • High accuracy measurement solution • Excellent customer support • Designed and manufactured in the United States of America • RoHS compliant 1 See the Televac website at www.televac.com for a list of definitions for terms used in the operating specifications. All test data was acquired at 23° C.

3F Mini Bayard-Alpert Hot Cathode Ionization Gauge Part Number: 3451-8305-25, 3451-8305-35, 3452-8306-05 Ordering Information 3F Mini BA Hot Cathode with DN-40 CF 3F Mini BA Hot Cathode with KF25 Flange 3F Mini BA Hot Cathode with 1” tube Standard Cable Cable Length 10 ft (3 m) 20 ft (6.1 m) 35 ft (10.6 m) 50 ft (15.2 m) MC300 4A/3F Configuration MC300 2A/3F Configuration MM200 Base Unit MM200 3F Module Dimensional Drawings Related Products 7E Double Inverted Magnetron Cold Cathode Sensor – This sensor has a measurement range from 1 x 10-8 up to 1 x 10-2 Torr. It indirectly measures absolute...