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KJLC® 423 Series Cold Cathode Gauges & 943 Controller

Note KJLC no longer offers the 423 gauge head and 943 controller. Please consider the KJLC Cold Cathode for a possible alternative. Please contact gauging@lesker.com for further details or technical support.

Controller displays pressure from 10-10 to 10-2 Torr (mbar) using a high-visibility LED display.


  • Two types of analog output are standard, for remote monitoring of pressure
  • Internal converter provides output that enables a simple log conversion from voltage to pressure over the entire operating range
  • Fast-responding, buffered analog output is provided through the 15-pin accessory connector on the rear panel
  • Inverted magnetron design
  • Sensor can operate at pressures much lower than traditional Penning cold cathode sensors
  • Ideal for UHV use
  • No filament to burn out—sensor is not ruined by sudden inrushes of air and is resistant to vibration damage
  • No need to adjust emission current or to degas the gauge, reducing response time to pressure changes

Product Manual Click here to download the product manual for this part.

Specifications Table

Measurement Range10-11 to 10-2 Torr (mbar)
Temperature (operating)0-70° C
Temperature (bakeout)400° C with CF flanges, and with magnet and cable removed
Materials Exposed to VacuumStainless steel, 6061 aluminum, Inconel, glass, and alumina ceramic
Repeatability (Typical)5%
Mounting/Installation OrientationAny
Calibration GasAir/Nitrogen
Internal Volume0.9 in3 (15 cm3) maximum
Interface CableTube side: Molded connector with a positive locking bolt Controller side: Bayonet connector and threaded coaxial connector

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