Vacuum Gauge, Nude Bayard-Alpert Ionization, Iridium, 2.75 in. CF, Pin Guard
The 274043 Nude Bayard-Alpert Hot Cathode Vacuum Gauge features a single thoria-coated iridium filament for a <3 x 10-11 - 1 x 10-3 Torr vacuum measurement range, and has a 2.75 inch non-rotatable CF flange fitting with pin guard. Bayard-Alpert (hot cathode) gauges provide pressure measurement based on the ionization of gas molecules by a constant flow of electrons from a filament. The number of ions created is directly proportional to the density of molecules. The ions are collected and measured by a vacuum gauge controller and converted to pressure based on the sensitivity of the gauge. nude Bayard-Alpert hot cathode vacuum gauges are the best solution to severe ionization gauge pumping problems. Specifications
Type
Vacuum Gauge
Sensor Type
Bayard-Alpert Hot Cathode
Vacuum Pressure Range
3.0 x 10-11 to 0.001 Torr
Accuracy
±20% (typical)
Orientation
Any
Flange Type
CF with Pin Guard
Flange Size
2.75 in.
Collector
Tungsten, 0.005 in. diameter
Grid
Refractory Metals
Length
4.125 in. (105 mm)
Sensitivity
10/Torr
X-ray Limit
4 x 10-10 Torr
Electron Bombardment Degas
100 Watts maximum
Resistance Heated Degas
6.3 to 7.5 VAC at 10 Amps (l2R)
Collector Potential
0 V
Grid Potential
+180 VDC
Filament
Single Thoria-coated Iridium
Filament Heating Current
4 - 6 Amps
Filament Heating Voltage
3 - 5 V
Filament Voltage Potential
+30 VDC
Maximum Bakeout Temperature
450°C
Type
Vacuum Gauge
Sensor Type
Bayard-Alpert Hot Cathode
Vacuum Pressure Range
3.0 x 10-11 to 0.001 Torr
Accuracy
±20% (typical)
Orientation
Any
Flange Type
CF with Pin Guard
Flange Size
2.75 in.
Collector
Tungsten, 0.005 in. diameter
Grid
Refractory Metals
Length
4.125 in. (105 mm)
Sensitivity
10/Torr
X-ray Limit
4 x 10-10 Torr
Electron Bombardment Degas
100 Watts maximum
Resistance Heated Degas
6.3 to 7.5 VAC at 10 Amps (l2R)
Collector Potential
0 V
Grid Potential
+180 VDC
Filament
Single Thoria-coated Iridium
Filament Heating Current
4 - 6 Amps
Filament Heating Voltage
3 - 5 V
Filament Voltage Potential
+30 VDC
Maximum Bakeout Temperature
450°C
