1. Products
  2. Granville-Phillips® Indirect Vacuum Gauges
  3. Vacuum Pressure Sensors
  4. Vacuum Pressure Sensors
  5. 274 Glass Tubulated Bayard-Alpert Type Ionization Vacuum Sensors

274 Glass Tubulated Bayard-Alpert Type Ionization Vacuum Sensors

Model: 274-glass-bayard-alpert-ionization-vacuum-gauge

274 Glass Tubulated Bayard-Alpert Type Ionization Vacuum Sensors

Model: 274-glass-bayard-alpert-ionization-vacuum-gauge

274 glass tubulated bayard-alpert ionization vacuum sensor

Technical Specs

  • Type
    Vacuum Pressure Sensor
  • Sensor Type
    Bayard-Alpert Type Ionization Gauge
  • Measurement Range
    <1.0 x 10-9 to 0.001 Torr
  • Collector
    Tungsten, .010 in. diameter
  • Accuracy
    ±20%
  • Bake Out Temperature
    450°C
  • Installation Orientation
    Any, Vertical preferred
  • Tubulation
    19 or 25 mm diameter x 57 mm, Kovar, Pyrex, or flanged
  • Envelope
    Nonex 7720 glass, 2 1/4 in. (57 mm) dia. x 5in. (127 mm) long
  • Cathode
    Dual tungsten or one thoria coated iridium
  • Grid
    Refractory Metals
  • Length
    6 in. (152 mm)
  • Sensitivity for N2
    10/Torr
  • X-ray Limit
    About 3 x 10-10 Torr
  • Electron Bombardment Degas
    100 watts max.
  • Resistance Heated Degas
    6.3 to 7.5 VAC at 10 A
  • Cathode Heating Current
    4 to 6 A
  • Cathode Heating Voltage
    3 to 5 V
  • Cathode Voltage Potential
    +30 VDC
  • Collector Potential
    0 V
  • Grid Potential
    +180 VDC

Technical Specs

  • Type
    Vacuum Pressure Sensor
  • Sensor Type
    Bayard-Alpert Type Ionization Gauge
  • Measurement Range
    <1.0 x 10-9 to 0.001 Torr
  • Collector
    Tungsten, .010 in. diameter
  • Accuracy
    ±20%
  • Bake Out Temperature
    450°C
  • Installation Orientation
    Any, Vertical preferred
  • Tubulation
    19 or 25 mm diameter x 57 mm, Kovar, Pyrex, or flanged
  • Envelope
    Nonex 7720 glass, 2 1/4 in. (57 mm) dia. x 5in. (127 mm) long
  • Cathode
    Dual tungsten or one thoria coated iridium
  • Grid
    Refractory Metals
  • Length
    6 in. (152 mm)
  • Sensitivity for N2
    10/Torr
  • X-ray Limit
    About 3 x 10-10 Torr
  • Electron Bombardment Degas
    100 watts max.
  • Resistance Heated Degas
    6.3 to 7.5 VAC at 10 A
  • Cathode Heating Current
    4 to 6 A
  • Cathode Heating Voltage
    3 to 5 V
  • Cathode Voltage Potential
    +30 VDC
  • Collector Potential
    0 V
  • Grid Potential
    +180 VDC

Resources & Downloads

Need help?

Contact an Applications Specialist by sending us an email