Compare Model Drawings, CAD & Specs Absolute Measurement Range Availability Price
347 stabil-ion vacuum transducer
Vacuum Transducer, Stabil-Ion Ionization, 2x10-10 Torr, 2.75 in. CF
2.0 x 10-10 to 0.02 Torr
347 stabil-ion vacuum transducer
Vacuum Transducer, Stabil-Ion Ionization, 1x10-10 Torr, 2.75 in. CF
1.0 x 10-10 to 0.02 Torr


  • Sensor
  • Measurement Range
    UHV gauge: 1x10-10 to 2x10-2 Torr, 1x10-10 to 3x10-2 Mbar, 1x10-8 to 3 Pa
    Extended range gauge: 2x10-10 to 2x10-2 Torr, 3x10-10 to 3x10-2 Mbar, 3x10-8 to 3 Pa
  • Operating Temperature
    0°C to 40°C
  • Maximum Bakeout Temperature
    450°C with electronics removed
  • Storage Temperature
    -40°C to 70°C
  • Analog Output
    1 V per decade, logarithmic, 0 to 7 VDC
  • Power Requirements
    24 VDC +15%, 75 W max., 3.75 A at 20 VDC
  • Accuracy
    +25% of reading from 1x10-8 to 1x10-4 (N2)
  • Repeatability
    +3% of reading from 1x10-8 to 1x10-4
  • Internal Volume
    73 cc to port screen
  • Exposed Materials
    All vacuum fired, UHV compatible
  • Electronic Casing and Flange
  • Weight
    800 gm (1 lb, 12.5 oz)
  • Filament
    Tungsten or yttria-coated iridium
  • X-ray Limit
    UHV: 2x10-11 Torr; 3x10-11 mbar; 3x10-9 Pa
    Extended range: 2x10-10 Torr; 3x10-10 mbar; 3x10-8 Pa
  • Emission Current
    0.1 mA and 4.0 mA
  • Degas
    Electron bombardment, 20 W with 2-minute timer
  • Remote Input Signals
    Gauge ON/OFF, degas ON/OFF, set by continuity to ground
  • Remote Output Signals
    Gauge and degas status by open collector transistor


Patented Stabil-Ion® Gauge Design

Its patented design is based on a number of enhancements including tensioned filaments, a precision-wound stress-relieved grid, and electrostatic shields. These enhancements result in an ionization gauge that is superior to all other designs in terms of accuracy, repeatability, and gauge-to-gauge reproducibility. The high measurement performance and rugged design of the Stabil-Ion gauge make it the gauge of choice for critical vacuum processes.

Rugged Stainless Steel Enclosure

The stainless steel enclosure prevents grid and filament damage during mounting and eliminates the risk of glass breakage.

Tensioned Filaments

The Filaments are tensioned so they stay precisely positioned to maintain calibration.

Electrostatic Shields

Electrostatic shields completely surround the electrode structure to provide a stable, accuracy enhancing electrical environment.

Precision-Wound, Stress-Relieved Grid

The Precision-wound, stress-relieved grid retains its original shape even after high-temperature degassing, thus reducing measurement errors.

Vacuum Fired Components

The Stabil-Ion gauge is designed, constructed, and processed to minimize outgassing. The gauge is never touched by bare hands during manufacturing.

Choice of Range and Dual Filaments

Available as extended range or ultra-high vacuum with burn-out resistant yttria-coated iridium filaments. Unscheduled down time is avoided by using the second filament as a back-up until the gauge can be replaced during the next routine maintenance cycle.

Causes of Unstable Behavior of Typical B-A Gauges vs. Stable Behavior of Stabil-Ion® Gauges

Long-term, accurate measurement is assured by the unique design and careful manufacturing of the Stabil-Ion Gauges. Here are the more important problems with older BA gauge designs that we removed in order to achieve accuracy over time and gauge-to-gauge. Sophisticated computer simulations of electron and ion trajectories helped greatly in identifying the causes of nonstable behavior

Analog Connector Pinouts

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