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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

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

Product Manual
For a download of the product manual, click here.
Contact Us
To speak with someone directly, please call 1-412-387-9200 or email international@lesker.com.